USER’S GUIDE Vaisala CARBOCAP® Carbon Dioxide Probe GMP343 M210514EN-E
PUBLISHED BY Vaisala Oyj P.O. Box 26 FI-00421 Helsinki Finland Phone (int.): Fax: +358 9 8949 1 +358 9 8949 2227 Visit our Internet pages at www.vaisala.com © Vaisala 2013 No part of this manual may be reproduced, published or publicly displayed in any form or by any means, electronic or mechanical (including photocopying), nor may its contents be modified, translated, adapted, sold or disclosed to a third party without prior written permission of the copyright holder.
________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Contents of This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
________________________________________________________________________________ CHAPTER 4 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Connecting GMP343 to PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Connection Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
________________________________________________________________________________ Setting the High Limit of the Concentration Range . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Setting the Low Limit of the Concentration Range . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Setting the Analog Output Overrange Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Testing the Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
________________________________________________________________________________ Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 Spare Parts and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 APPENDIX A DIMENSIONS . . . . . . . . . . . . . . .
________________________________________________________________________________ List of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Two Models of GMP343 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Components of the Sampling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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________________________________________________________________________________ List of Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Manual Revisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Wiring Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Communication Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Chapter 1 ________________________________________________________ General Information CHAPTER 1 GENERAL INFORMATION This chapter provides general notes for the manual and the product. About This Manual This manual provides information for installing, operating, and maintaining the Vaisala CARBOCAP® Carbon Dioxide Probe GMP343. Contents of This Manual - - Chapter 1, General Information: This chapter provides general notes for the manual and the product.
User’s Guide ______________________________________________________________________ Version Information Table 1 Manual Revisions Manual Code Description M210514EN-E November 2013. This manual. Updated probe cleaning instructions. June 2013. Previous version. Updated temperature dependence specification. Updated Technical Support contact information and warranty information.
Chapter 1 ________________________________________________________ General Information Recycling Recycle all applicable material. Dispose of batteries and the unit according to statutory regulations. Do not dispose of with regular household refuse. Trademarks CARBOCAP® is a registered trademark of Vaisala Oyj.
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Chapter 2 __________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the features of the GMP343. Introduction to GMP343 Vaisala CARBOCAP® Carbon Dioxide Probe GMP343 is designed for high accuracy CO2 measurements. The measurement is based on the advanced CARBOCAP® Single-Beam Dual-Wavelength NDIR technology. GMP343 consists of a CO2 sensor, electronics, and a housing suitable for long-term outdoor use.
User’s Guide ______________________________________________________________________ GMP343 Transmitter Components Figure 1 Two Models of GMP343 The following numbers refer to Figure 1 above. 1 = Filter 2 = Wiring connector 3 = Gas in 4 = Gas out 5 = Back flange (do not open) NOTE Warranty is void if the back flange of the GMP343 has been opened by the user. User Configurable CO2 Measurement The measurement output of the GMP343 is user configurable.
Chapter 2 __________________________________________________________ Product Overview You can also select the measurement range to optimize the performance of the GMP343 for a certain concentration level. Selecting an appropriate measurement range increases accuracy, since it enables the range-specific compensation and linearization settings. For more information, see sections Setting the Measurement Range on page 40 and Temperature, Pressure, Relative Humidity, and Oxygen Compensations on page 45.
User’s Guide ______________________________________________________________________ Optics Heating Two heating elements are placed in the optics; one behind the mirror and one behind the window of the sensor. Heating should always be turned on when there is a risk of dew formation on the optics surface. The heating maintains the surface temperature of the optics a few degrees above the ambient temperature. The heating is disabled by default.
Chapter 2 __________________________________________________________ Product Overview CAUTION Liquids or acidic vapors may seriously damage the sensor. Sampling System The GMP343 flow-through model has no diffusion filter inside the measuring chamber and the optics of the flow-through model cannot be cleaned by the user. Therefore the sample gas must always be filtered and dried before it is pumped to the measuring chamber.
User’s Guide ______________________________________________________________________ Optional Accessories Various adapter and filter options are available for the GMP343. For a complete list, see section Spare Parts and Accessories on page 80. Figure 4 Examples of Optional Accessories Soil Adapter Kits for In-Soil Applications The vertical/horizontal soil adapter kit consists of a soil adapter and a hydrophobic sintered PTFE filter.
Chapter 2 __________________________________________________________ Product Overview 1. Plug in the recharger connector into the connector on top of the indicator and connect the recharger to a wall socket. A battery symbol in the corner of the display starts to roll. It is not recommended to use MI70 during the first recharging. Later on MI70 can be used while recharging. Duration of recharging depends on the charge level of the battery pack being 4 hours typical.
User’s Guide ______________________________________________________________________ Using MI70 as a Display Introduction of Function Keys and Menu Structure Figure 6 0704-034 Keyboard of MI70 The following numbers refer to Figure 6 on page 20: 1 = Function keys left/middle/right (can be assigned to shortcuts) 2 = Arrow keys up/down/left/right 3 = Power on/off key Initialization of MI70 NOTE The optics heating is automatically disabled when you connect the GMP343 to the MI70 indicator. 1. 2. 3. 4. 5.
Chapter 2 __________________________________________________________ Product Overview 6. To check and change the environment settings, select YES. Enter ambient pressure, humidity, and oxygen values. Press the EXIT key. Navigation in Menu - - To turn the indicator on or off, press the Power On/Off key. To open the main menu, press any of the arrow keys and then the middlemost function key in sequence. To move in a menu and select an option, press the up/down arrow keys.
User’s Guide ______________________________________________________________________ Transferring Recorded Data to PC The recorded data can be transferred to a PC by using MI70 Link program. MI70 Link program can be ordered from Vaisala, see Table 12 on page 80. You can examine the recorded data easily in Windows and transfer it further to a spreadsheet program (such as Microsoft® Excel) for modification.
Chapter 3 _______________________________________________________________ Installation CHAPTER 3 INSTALLATION This chapter provides you with information that is intended to help you install this product. Mounting A horizontal mounting position is recommended in order to minimize the problems caused by possible condensation. Figure 7 0704-020 1. 2. Mounting GMP343 Fasten the GMP343 to the mounting bracket by using the screw provided. Mount the mounting bracket with 4 screws (on corners of the plate).
User’s Guide ______________________________________________________________________ Wiring As it is shipped from the factory, the measurement range and output of the GMP343 are scaled according to the order form completed by the customer. The unit is calibrated at the factory. The device is ready for use when the wiring is done and power is switched on. GMP343 can be connected to a PC using an optional PC connection cable, see Table 12 on page 80.
Chapter 3 _______________________________________________________________ Installation There are two pins per signal internally hardwired in parallel (pins 1 and 2, pins 3 and 7). You should connect the RS-232C signal 'TX' (or 2-Wire RS485 signal 'A') either to the pin 1 or 2 and the RS-232C signal 'RX' (or 2Wire RS-485 signal 'B') either to the pin 3 or 7. Note that there is either an RS-232 or a 2-wire RS-485 communication interface available according to initial configuration.
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Chapter 4 ________________________________________________________________ Operation CHAPTER 4 OPERATION This chapter contains information that is needed to operate the GMP343. Connecting GMP343 to PC Connection Cables To connect the GMP343 to a PC, you need the PC Connection Cable (optional accessory 213379). If your PC does not have a serial port, you also need the USB-D9 Serial Connection Cable (optional accessory 219686).
User’s Guide ______________________________________________________________________ 4. 5. After the driver has been installed, connect the USB cable to a USB port on your PC. Windows will detect the new device, and use the driver automatically. The installation has reserved a COM port for the cable. Verify the port number, and the status of the cable, using the Vaisala USB Instrument Finder program that has been installed in the Windows Start menu.
Chapter 4 ________________________________________________________________ Operation 5. If your device is configured to RS-485 communication mode, switch the device into the service mode by sending a string containing at least 6 capital 'Z' while powering up. The most convenient way using PC is: Press and keep pressing SHIFT + 'z' while powering up GMP343. Keep pressing SHIFT + 'z' until GMP343 starts up in the service mode.
User’s Guide ______________________________________________________________________ Operation modes of the GMP343 The GMP343 can operate in three different modes: - RUN mode STOP mode POLL mode In the RUN mode, the GMP343 sends measurement results at regular intervals. The included parameters and the interval can be set by the user. While in the RUN mode, the device will not answer any other command except the S command, which stops the RUN mode and switches the device to STOP mode.
Chapter 4 ________________________________________________________________ Operation Getting the Measurement Message Measurement Units GMP343 outputs the following units: - Carbon dioxide (ppm) Temperature (ºC) For other measurement units (%, non-metric units), use the Vaisala MI70 indicator. NOTE The built-in temperature sensor is intended for compensation of the CO2 measurement. By default the compensation is enabled.
User’s Guide ______________________________________________________________________ Setting the Continuous Outputting Interval INTV xxxx yyy SAVE xxxx=output interval (1...1000) default=1 s yyy=unit (s, min or h) Example: Output interval is changed to 5 seconds >intv 5 s INTERVAL UNIT > : 5 : S Outputting the Reading Once In STOP mode: SEND In POLL mode: SEND aa aa=address of the transmitter when more than one transmitter is connected to a serial bus (0...99).
Chapter 4 ________________________________________________________________ Operation In STOP mode: Measurements output only by command, all commands can be used (default mode). In RUN mode: Outputting automatically, only command S can be used. In POLL mode: Measurements output only with command SEND. For more details on POLL mode, see sectionNetworking Operation on page 37. The settings are not valid until the device is reset.
User’s Guide ______________________________________________________________________ Serial Communication Settings Save the changed settings by entering the SAVE command. The settings are not valid until the device is reset. SERI SAVE Baud rate: (300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200) Note: When baud rate is > 19200 the character spacing must be > 1 ms. If the character spacing is not in use the device may lose some characters.
Chapter 4 ________________________________________________________________ Operation Formatting the Measurement Message Formatting the Message This command is used to change the serial output format of the commands SEND and R. FORM x SAVE x= format string Format string consists of quantities and modifiers. You can select one or more of the following quantities by keying in the abbreviation after FORM command: Table 4 Quantities Abbreviations Quantities CO2 Filtered CO2 results.
User’s Guide ______________________________________________________________________ Example 1: >form CO2 " " "ppm" #r#n >save EEPROM saved successfully. >send 336.3 ppm Example 2: >form "Filtered data" CO2 "ppm" #r#n >save EEPROM saved successfully > >send Filtered data 336.9ppm > Example 3 (both filtered and raw data chosen): >form CO2 "ppm" " " CO2RAWUC "ppm" #r#n >send 296.5ppm 270.1ppm Setting Time TIME x SAVE x=hh:mm:ss Time passed since the last power on was displayed.
Chapter 4 ________________________________________________________________ Operation NOTE Only approximately 1 % accuracy is obtained with the software clock. Networking Operation When several transmitters are connected to the same RS-485 bus it is recommended to use separate power supplies for each transmitter. Make sure that the devices are grounded to the same potential. Otherwise harmful ground currents may be generated or RS-485 common-mode limits may be exceeded.
User’s Guide ______________________________________________________________________ Open and Close OPEN nn nn=address of the transmitter (0...99) The OPEN command sets the bus temporarily in STOP mode so that the SMODE command can be entered. CLOSE In STOP mode: Command OPEN has no effect, CLOSE sets the transmitter temporarily in POLL mode. In POLL mode: Command OPEN sets the transmitter temporarily in STOP mode. Example: >close line closed GMP343: 1 line opened for operator commands >send 351.
Chapter 4 ________________________________________________________________ Operation Preparation for Network Operation Before GMP343 is connected to the network it must be configured. Normal procedure is shown below: First connect the device to PC by using RS-232 and when communication is currently open, key in the following commands: RSMODE 485 ADDR addr (where addr is 1...99) SMODE POLL SAVE Next turn the power off. Then you can connect the device to RS-485 network.
User’s Guide ______________________________________________________________________ Measurement Range, Data Filtering and Linearization Setting the Measurement Range The measurement range of the GMP343 has been set at factory according to the order form. However, you can change the measurement range to optimize measurement performance for a certain concentration level.
Chapter 4 ________________________________________________________________ Operation Measurement Data Filtering The raw measurement values (measurement interval = 2 seconds) are an input to a chain of three filters: a median, an averaging, and a smoothing filter. The filters can be individually enabled or disabled by setting the filter coefficient to 0 (zero) or by choosing CO2RAW instead of CO2 for the measurement output quantity (see FORM command).
User’s Guide ______________________________________________________________________ Averaging Filter The averaging filter calculates a moving average over the user-set period of time. The longer the averaging time is the lower the noise at the measurement signal. For example, if the averaging is set to 30 seconds, the most recent average filter output is the average of the last 15 measurements (2 seconds measurement interval). The averaging time is set by the AVERAGE command.
Chapter 4 ________________________________________________________________ Operation How the Filtering Affects the Response Time The figure on the next page illustrates the difference of the two filters in regard to time response. The averaging time is set to 40 seconds while the smoothing factor is set to 10 to have about equal noise rejection properties. See also the response time tables presented in SpecificationsResponse time (90 %) on page 77.
User’s Guide ______________________________________________________________________ Setting the Averaging Filter Use the averaging filter to reduce the noise of the measurement. Notice the effect on the response time. AVERAGE x SAVE x=0...60 seconds (default =10 s) >average 20 AVERAGING (s) : 20 >save EEPROM saved successfully (829 ms). > Setting the Smoothing Filter Use the smoothing filter to reduce the noise of the measurement for long averaging periods.
Chapter 4 ________________________________________________________________ Operation Linearization Due to the principle of the CO2 absorption, the sensor of GMP343 produces a signal which is not linear in relation to the CO2 concentration. However, the output signal is linearized with the internal linearization function. The user can disable the internal linearization function to achieve a signal proportional to the absorption.
User’s Guide ______________________________________________________________________ (T, P, RH, and O2). The temperature, pressure, relative humidity, and oxygen compensations are enabled as a factory default (default environmental parameters: pressure 1013 hPa, relative humidity 50 % RH, oxygen 20.95 % O2). The compensation settings are specific to the selected measurement range, so selecting a suitable measurement range also optimizes the compensation performance.
Chapter 4 ________________________________________________________________ Operation Temperature Compensation ON/OFF The internal temperature sensor is located in the measurement chamber. Temperature compensation is done automatically unless for some reason you want to take the compensation feature off. To enable or disable temperature compensation, use the commands: TC x SAVE x=ON/OFF (default =ON) >tc on TC : ON >tc off TC : OFF > >save EEPROM saved successfully.
User’s Guide ______________________________________________________________________ Setting Oxygen When the Device Is in POLL-mode To set oxygen value in POLL-mode, use the following addressable command: XO addr x The device does not reply to the command. If given oxygen value is not within limits, the command is rejected. The given value is written to volatile memory, where it will be overwritten either by next XO-command or O-command.
Chapter 4 ________________________________________________________________ Operation Setting the Ambient Pressure (hPa) The pressure value is needed in pressure, humidity, and oxygen compensations. To set the ambient pressure value, use the commands: P x SAVE x=700...1300 hPa (default =1013 hPa) Sets ambient pressure (hPa) to be used in compensation calculations. >p 1100 PRESSURE (hPa)): 1100.000 >p PRESSURE (hPa) : 1100.000 ? > >save EEPROM saved successfully.
User’s Guide ______________________________________________________________________ Pressure Compensation ON/OFF To enable or disable the pressure compensation, use the commands: PC x SAVE x=ON/OFF (default =ON) >pc off PC: OFF >pc on PC : ON ? >save EEPROM saved successfully. > Setting Ambient Relative Humidity To set the ambient relative humidity value, use the commands: RH x SAVE x=0 ... 100 % RH (default =50 %) >rh HUMIDITY (%RH): 0.00 ? 24 >save EEPROM saved successfully.
Chapter 4 ________________________________________________________________ Operation Relative Humidity Compensation ON/OFF To enable or disable the humidity compensation, use the commands: RHC x SAVE x=ON/OFF (default =ON) NOTE Check that the ambient pressure value is correct. The correct pressure value is needed for RH compensation even if the pressure compensation is disabled. >rhc on RHC : ON >rhc off RHC : OFF > >save EEPROM saved successfully.
User’s Guide ______________________________________________________________________ Setting and Testing the Analog Outputs GMP343 has one analog output channel. The channel outputs either current or voltage signal according to the order configuration. The analog output always gives the filtered CO2 results regardless of the quantity set with FORM command. Analog Output Hardware AMODE SAVE Analog output hardware can be chosen between current or voltage output.
Chapter 4 ________________________________________________________________ Operation Setting the Limit of the Current Output Range You can expand the current output range for example 4...20 mA to 0...20 mA. The range available is 0...4 mA. ILOW SAVE Key in the low current value (mA) and press ENTER. >ilow ILOW (mA) : 4.000 ? 0 >save EEPROM saved successfully. > Setting the High Limit of the Voltage Output Range You can set the hight voltage value: 0...5 V.
User’s Guide ______________________________________________________________________ Setting the High Limit of the Concentration Range Sets the hight CO2 concentration value, which corresponds to the analog output high value. AHIGH SAVE Key in the highest concentration value (ppm) and press ENTER. >ahigh AHIGH (ppm) : 1000.0 ? 1200 > >save EEPROM saved successfully.
Chapter 4 ________________________________________________________________ Operation Setting the Analog Output Overrange Clip This command clips the analog output signal at the high value when the signal goes over range. In case of the current output the current will not go higher than 20 mA or below the low value current (set with ILOW). The voltage output will not go higher than the voltage set with UHIGH.
User’s Guide ______________________________________________________________________ Setting the Analog Output Error Level Factory default states for analog outputs during error condition are the maximum values of the measuring range=2.5 V / 5 V / 20 mA. AERR x SAVE x=error value (mA) or (V) Acceptable ranges: 0...20 mA, 0...6 V Example: >aerr AERR (V) : 5.000 ? 0 > >save EEPROM saved successfully. > NOTE The error output value must be within a valid range for current (0...
Chapter 4 ________________________________________________________________ Operation Device Information and Other General Commands Device Information List This command outputs the information about the device. ? This command outputs the information about the device even in POLLmode. ?? >?? GMP343 / 2P0.33 SNUM : CALIBRATION : CAL. INFO : SPAN (ppm) : PRESSURE (hPa) : HUMIDITY (%RH) : OXYGEN (%) : PC : RHC : TC : OC : ADDR : ECHO : SERI : SMODE : INTV : Y3040008 2007-04-20 Vaisala Oyj 4000 1013.
User’s Guide ______________________________________________________________________ Linear and Multipoint Corrections Shows the last linear and multipoint correction values. CORR >corr LC : OFF Linear correction Reading Reference 0.00 0.000 1000.00 1000.000 MPC : OFF Multipoint correction Reading Reference 0.00 0.000 1000.00 1000.000 > Error Messages The ERRS command shows the error messages received. For a list of possible errors, refer to Table 7 on page 72. ERRS >errs No errors detected.
Chapter 4 ________________________________________________________________ Operation Command List This command displays a list of all the commands. HELP Showing the Parameters PARAM >param RSMODE ADDR SERI SMODE FORM INTV ECHO : : : : : : : 232 0 19200 8 NONE 1 STOP CO2 \r \n 1 S ON AMODE ACUT AERR (V) AHIGH (ppm) ALOW (ppm) ILOW (mA) UHIGH (V) : : : : : : : U ON 2.50 3000.00 0.00 4.00 2.
User’s Guide ______________________________________________________________________ Memory Handling Reverting the Factory Parameters Use this command to revert the original factory settings. >factory Parameters loaded from Flash. > Remember to check the settings after using this command. Saving the Setting SAVE Saves the parameters and settings to EEPROM memory. Setting the Optics Heating ON/OFF Enables or disables optics heating.
Chapter 5 __________________________________________________ Calibration and Adjustment CHAPTER 5 CALIBRATION AND ADJUSTMENT This chapter contains information for performing the calibration and adjustment of the GMP343. In this user's guide the term calibration means comparing the transmitter's reading to a reference concentration. Adjustment, which is usually done after calibration, the reading of the transmitter is changed to correspond to the reference concentration.
User’s Guide ______________________________________________________________________ Calibration and Adjustment by the User Calibration and adjustment are carried out by using the serial communications and the calibration gas(es). Additional equipment needed: - power supply 11...
Chapter 5 __________________________________________________ Calibration and Adjustment concentration of nitrogen mixture gases is usually 0 %. If necessary, adjust the values. For example: P 1000.3 RH 0 O 0 For more information on compensations, see section Temperature, Pressure, Relative Humidity, and Oxygen Compensations on page 45. Measurements in Reference Gases 1. 2. 3. 4. 5. 6. 7.
User’s Guide ______________________________________________________________________ Adjustment in 1...2 Points First carry out checking the compensations and perform the reference gas measurements as instructed in the previous section, Calibration and Adjustment by the User on page 62. Then continue as follows: 1. 2. 3. 4. 5. 6. 7. 8. 9. Key in the command LCI Key in the reading at the reference gas (ppm) and press ENTER (1.Reading?).
Chapter 5 __________________________________________________ Calibration and Adjustment Adjustment in 3...8 Points First carry out checking the compensations and perform the reference gas measurements as instructed in the previous section, Calibration and Adjustment by the User on page 62. Then continue as follows: 1. 2. 3.
User’s Guide ______________________________________________________________________ 3. The GMP343 is now measuring the second reference gas (1007 ppm). Use command R and let the reading stabilize for several minutes. Calculate the average reading (reading 2). > >r 1067.1 1066.8 1067.2 1066.7 1066.6 4. Turn off the calibration mode with command CALIB OFF. >calib off Calibration mode stopped. 5.
Chapter 5 __________________________________________________ Calibration and Adjustment 8. Check the reading with the first reference gas, 0 ppm. >r 0.2 0.1 -0.1 -0.1 -0.0 -0.2 9. Save the settings. save> EEPROM saved successfully. > NOTE You can revert the GMP343 back to factory settings with the command FACTORY.
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Chapter 6 ______________________________________________________________ Maintenance CHAPTER 6 MAINTENANCE This chapter instructs in the basic maintenance of the GMP343. Cleaning the Probe Housing You can clean the probe housing wiping with a moist cloth. Note the following precautions when cleaning: - Do not immerse the GMP343 in liquid to clean it. Do not attempt to clean the optical surfaces except as described in section Changing the Filter and Cleaning the Optics (Diffusion Model Only) on page 70.
User’s Guide ______________________________________________________________________ Changing the Filter and Cleaning the Optics (Diffusion Model Only) The optics of the diffusion model are well protected by the filter, and it can tolerate some dirt on the optics as the measurement is compensated for the reduction of signal. For this reason, there is typically no reason to perform any cleaning actions even if the probe appears slightly dirty on the outside.
Chapter 6 ______________________________________________________________ Maintenance 3. Blow on the mirror and window area with clean instrument air to remove any loose particles. Figure 11 0704-021 Optics The following numbers refer to Figure 11 on page 71: 1 = Mirror 2 = Window 4. CAUTION If the mirror and/or window seem dirty, perform the following steps: Do not rub or wipe the optical surfaces, as that may scratch or otherwise damage them. a. b. c. 5. 6.
User’s Guide ______________________________________________________________________ Error States In case of an error function the outputs are as follows: - - Serial line: In STOP mode the error code and description (see the Table 6 below) is shown when keying in the command: ERRS. In POLL or RUN mode the error flag is set to 1 (if the error flag is included in the message format, see FORM-command). Reset the error state with a command ERRS R.
Chapter 6 ______________________________________________________________ Maintenance In all error cases first check that the probe is connected properly, then reset the transmitter by disconnecting it. In case of constant error, please contact Vaisala technical support. See section Technical Support on page 73. CAUTION Please note that there are no user-serviceable parts inside the GMP343 transmitter body. The back flange shall not be opened except by authorized Vaisala service personnel.
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Chapter 7 ____________________________________________________________ Technical Data CHAPTER 7 TECHNICAL DATA This chapter provides the technical data of the GMP343. Performance Sensor Vaisala CARBOCAP® Measuring principle Single-Beam Dual-Wavelength NDIR Measurement range options 0 ... 1000 ppm 0 ... 2000 ppm 0 ... 3000 ppm 0 ... 4000 ppm 0 ... 5000 ppm 0 ... 2 % Accuracy (excluding noise) at 25 °C and 1013 hPa after factory calibration with 0.5 % accurate gases with different range options 0 ...
User’s Guide ______________________________________________________________________ Effects of Temperature, Pressure, Relative Humidity, and Oxygen The temperature compensation of GMP343 is based on the built-in Pt1000 temperature sensor. The values of pressure, relative humidity, and oxygen must be input by the user, if they vary from the default. Temperature Table 8 Effect of Temperature on Accuracy with Temperature Compensation CO2 range options 0 ... 1000 ppm 0 ... 2000 - 5000 ppm 0 ...
Chapter 7 ____________________________________________________________ Technical Data Humidity Effect on accuracy with humidity compensation: ±0.006 % of reading / g/m3 H2O below 1000 ppm CO2 ±0.02 % of reading / g/m3 H2O above 1000 ppm CO2 The values above only apply in normal ambient pressure. Effect on accuracy without humidity compensation (typ.): +0.05 % of reading / g/m3 H2O For more information on operating humidity range, see Figure 12 on page 79.
User’s Guide ______________________________________________________________________ Flow dependence of flow-through model 0.3 % of reading / 1 / min Warm-up time full accuracy ±0.5 % full accuracy 10 min 30 min Inputs and Outputs Operation voltage 11 ... 36 VDC Power consumption without optics heating <1 W with optics heating <3.5 W Current output range resolution max load 4 ... 20 mA 14 bits 800 Ω @ 24 VDC 150 Ω @ 10 VDC Voltage output range resolution min. load 0 ... 2.5 V, 0 ...
Chapter 7 ____________________________________________________________ Technical Data Operating Conditions The GMP343 operating conditions in terms of temperature (T) and relative humidity (RH) are illustrated in the following graph: Easy Moderate Harsh Stability not specified 100 90 80 %RH 70 60 50 40 30 20 10 0 -40 -30 -20 -10 0 10 20 30 40 50 60 Temperature (°C) Figure 12 0704-024-B Temperature GMP343 Operating Conditions operating storage Humidity Pressure -40 ... +60 °C (-40 ..
User’s Guide ______________________________________________________________________ Materials Housing Anodized aluminium Filter cover PC IP classification Housing (cable attached) IP67 Diffusion filter (weather protection) IP65 Diffusion filter (sintered PTFE) IP66 Cable connector type 8-pin M12 Weight (probe only) 360 g Spare Parts and Accessories Table 12 List of Spare Parts and Accessories Description Order code Wall mounting bracket Mounting flange Standard diffusion filter (weather protect
Appendix A ______________________________________________________________ Dimensions APPENDIX A DIMENSIONS This appendix contains the dimension drawings for the GMP343.
User’s Guide ______________________________________________________________________ GMP343 (Flow-through) 6.88 175 7.4 188 0.94 24 1.77 45 2.
Appendix A ______________________________________________________________ Dimensions GMP343 (Diffusion) 7.13 181 7 .6 4 194 2.07 52.5 2.
User’s Guide ______________________________________________________________________ Calibration Cap 84 ___________________________________________________________________M210514EN-E
Appendix A ______________________________________________________________ Dimensions Mounting Flange VAISALA _______________________________________________________________________ 85
User’s Guide ______________________________________________________________________ Junction Box 86 ___________________________________________________________________M210514EN-E
Appendix A ______________________________________________________________ Dimensions Mounting Bracket VAISALA _______________________________________________________________________ 87
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Appendix B ________________________________________________________ List of Commands APPENDIX B LIST OF COMMANDS This appendix lists the serial commands of the GMP343. Measurement Commands The bold text in the brackets is a default setting. Key in the commands with the keyboard of your computer and press enter. In this guide, stands for pressing ENTER.
User’s Guide ______________________________________________________________________ Filtering Commands AVERAGE Set the averaging filter SMOOTH Set the smoothing filter MEDIAN Set the median filter RESYNC Flush (clear) all the filters P, T and RH Compensation Commands P Set local pressure (hPa) for compensation PC Pressure compensation mode RH Set local humidity (% RH) for compensation RHC Humidity compensation mode TC Temperature compensation mode O Set the oxygen for compensation OC O
Appendix B ________________________________________________________ List of Commands PARAM Display parameters TIME Display or set time since reboot VERS Display the SW version information Calibration Commands CALIB ON Turn on the calibration mode CALIB OFF Turn off the calibration mode LC Linear correction mode LCI Enter linear correction MPC Multipoint correction mode MPCI Enter multipoint correction Setting and Testing the Analog Outputs AMODE Set analog output HW (current or voltage m
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