GE Kaye CTR –80 Cold Temperature Reference User’s Guide
World Headquarters GE Kaye Instruments, Inc. • 101 Billerica Avenue, Building #7 • North Billerica, MA 01862 • USA tel 978-262-0005, 800-964-5293 (US & Canada) • fax 978-439-8181 • email kaye@ge.com European Headquaters GE Kaye Europe • Sinsheimer Strasse 6 • D-75179 Pforzheim • Germany tel +49 (0) 7231 14335 0 • fax +49 (0) 7231 14335 29 email info@kaye-europe.com www.gekaye.com Subject to change without notice. • Copyright 2002 • Printed in USA Rev.
Table of Contents 1 Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 Symbols Used. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.2 Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 Comparison Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 6.3 Calibration of Multiple Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 7 Parts and Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 7.1 Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 7.2 Bath Tank and Lid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 7.
9.4 9.5 9.6 9.7 9.8 9.9 Secondary Menu . . . . Heater Power . . . . . . Proportional Band . . . Cutout . . . . . . . . . . Controller Configuration Operating Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.3 Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Drain Valve Installation—IMPORTANT: Do Not Over Tighten. Follow the installation instructions above. . . . . . . . . . . . CTR-80 Control Panel . . . . . . . . . . . . . . . . . . . . . . Back Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . Controller Operation Flowchart . . . . . . . . . . . . . . . . . Serial Cable Wiring . . . . . . . . . . . . . . . . . . . . . . . Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . .
Tables Table 1 Table 2 Table 3 Table 3 vi International Electrical Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table of Various Bath Fluids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Controller Communications Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Controller Communications Commands continued . . . . . . . . . . . . . . . . . . . . . . . .
1 Before You Start 1 Before You Start 1.1 Symbols Used Table 1 lists the International Electrical Symbols. Some or all of these symbols may be used on the instrument or in this manual.
1 Before You Start Symbol Description Canadian Standards Association OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per IEC1010-1 refers to the level of Impulse Withstand Voltage protection provided. Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from the fixed installation. Examples include household, office, and laboratory appliances. CAT C-TIC Australian EMC mark 1.2 Safety Information Use this instrument only as specified in this manual.
1 Before You Start • If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. • Before initial use, or after transport, or after storage in humid or semi-humid environments, or anytime the instrument has not been energized for more than 10 days, the instrument needs to be energized for a "dry-out" period of 2 hours before it can be assumed to meet all of the safety requirements of the IEC 1010-1.
1 Before You Start • High voltage is used in the operation of this equipment. Severe injury or death may result if personnel fail to observe the safety precautions. Before working inside the equipment, turn off the power and disconnect the power cord. BATH FLUIDS • Fluids used in this unit may produce noxious or toxic fumes under certain circumstances. Consult the fluid manufacturer’s MSDS (Material Safety Data Sheet). Proper ventilation and safety precautions must be observed.
1 Before You Start • DO NOT operate this instrument in an excessively wet, oily, dusty, or dirty environment. • The unit is a precision instrument. Although it has been designed for optimum durability and trouble free operation, it must be handled with care. Position the unit before the tank is filled with fluid. Use the handles provided to move the unit. Due to the weight of the compressor, it may require two people to safely move the bath.
1 Before You Start ♦ 1.3 Voltage Cut In: ±7.5% (213 - 247 VAC) Customer Service Information Kaye Instruments can be contacted by writing to: World Headquarters GE Kaye Instruments, Inc. 101 Billerica Avenue, Building 7 North Billerica, MA 01862 tel. +1 (978) 262 0005 fax +1 (978) 439 8181 e-mail kaye@ge.com European Headquarters GE Kaye Europe GmbH Sinsheimer Strasse 6 D-75179 Pforzheim, Germany tel. +49-(0)-7231-14335-0 fax +49-(0)-7231-14335-29 e-mail info@kaye-europe.com service@kaye-europe.
2 Introduction 2 Introduction The Kaye CTR –80 is an ultra low temp bath useful in temperature calibration and other applications requiring stable temperatures. An innovative state of the art solid-state temperature controller has been incorporated which maintains the bath temperature with extreme stability. The temperature controller uses a micro-controller to execute the many operating functions. The user interface is provided by the 8-digit LED display and four key-switches.
3 Specifications and Environmental Conditions 3 Specifications and Environmental Conditions 3.1 Specifications 3.2 Range –80°C to 100°C (–112°F to 212°F) Ambient Operating Range 15°C to 25°C (59°F to 77°F) Stability ±0.006°C at –80°C (ethanol) ±0.010°C at 0°C (ethanol) ±0.010°C at 100°C (oil) Uniformity ±0.008°C at –80°C (ethanol) ±0.012°C at 0°C (ethanol) ±0.012°C at 100°C (oil) Set-Point Accuracy ±0.5°C Set-Point Repeatability ±0.01°C Resolution 0.01° Access Opening 3.25" x 4.
3 Specifications and Environmental Conditions • ambient relative humidity: 15–50% • pressure: 75kPa–106kPa • mains voltage within ±10% of nominal • vibrations in the calibration environment should be minimized • altitude less than 2,000 meters 3.3 Hardware Warranty and Assistance 3.3.1 Instrument Warranty GE Kaye Instruments, Inc. warrants its products against defects in materials and workmanship for a period of 12 months from the date of shipment. GE Kaye Instruments, Inc.
3 Specifications and Environmental Conditions installed exchange part will solve the problem with minimal inconvenience and expense. Factory repairs can frequently be completed on a fixed price basis. A base service fee plus labor and materials will be charged in lieu of the fixed repair price upon customer request or if extensive repairs are required. Customers are requested to obtain a return authorization number prior to returning any instrument for service.
4 Quick Start 4 Quick Start Caution: READ SECTION 6 TITLED BATH USE before placing the bath in service. Incorrect handling can damage the bath and void the warranty. This chapter gives a brief summary of the steps required to set up and operate the bath. This should be used as a general overview and reference and not as a substitute for the remainder of the manual. Please read Section 5 through 8 carefully before operating the bath. 4.
4 Quick Start Set up of the bath requires careful unpacking and placement of the bath, installing the drain valve, filling the bath with fluid, and connecting power. Consult Section 5 for detailed instructions for proper installation of the bath. Be sure to place the bath in a safe, clean and level location. Install the drain valve onto the pipe fitting at the back of the bath and make sure the valve is closed. See Section 5.3, Bath Preparation and Filling.
4 Quick Start When “SET” is pressed the display shows the set-point memory that is currently being used and its value. Eight set-point memories are available. S Access set-point selection 1. 25.0 Set-point 1, 25.0°C currently used Press “SET” to select this memory and access the set-point value. S Access set-point value C 25.00 Current value of set-point 1, 25.00°C Press “UP” or “DOWN” to change the set-point value. U Increment display C 30.
5 Installation 5 Installation Caution: READ SECTION 6 TITLED BATH USE before placing the bath in service. Incorrect handling can damage the bath and void the warranty. 5.1 Bath Environment The CTR –80 Bath is a precision instrument which should be located in an appropriate environment. The location should be free of drafts, extreme temperatures and temperature changes, dirt, etc. The surface where the bath is placed must be level. Allow at least six inches around the bath for air circulation.
5 Installation Ensure the valve handle is in the closed position before attempting to add fluid to the tank. Hex Nut Valve body Back of bath Figure 1 Drain Valve Installation—IMPORTANT: Do Not Over Tighten. Follow the installation instructions above. 5.3.2 Filling With Fluid The CTR –80 Bath is not provided with a fluid.
5 Installation below the top. Carefully monitor the bath fluid level as the bath temperature rises to prevent overflow or splashing. Cautiously, remove excess hot fluid if necessary. 5.4 Power With the bath power switch off, plug the bath into an AC mains outlet of the appropriate voltage, frequency, and current capacity. See Section 3.1, Specifications, for power details. Refer to and read the CAUTION at the front of this manual concerning brownout and over voltage protection.
6 Bath Use 6 Bath Use Caution: READ this section BEFORE PLACING THE BATH IN SERVICE The information in this section is for general information only. It is not designed to be the basis for calibration laboratory procedures. Each laboratory will need to write their own specific procedures. 6.1 General Be sure to select the correct fluid for the temperature range of the calibration. Bath fluids should be selected to operate safely with adequate thermal properties to meet the application requirements.
6 Bath Use tion. The fluid in the bath allows different types of probes to be calibrated at the same time. However, stem effect from different types of probes is not totally eliminated. Even though all baths have horizontal and vertical gradients, these gradients are minimized inside the bath work area. Nevertheless, probes should be inserted to the same depth in the bath liquid. Be sure that all probes are inserted deep enough to prevent stem effect.
7 Parts and Controls 7 Parts and Controls 7.1 Control Panel The following controls and indicators are present on the controller front panel (see Figure 2 below): (1) the digital LED display, (2) the control buttons, (3) the on/off power switch, (4) the heater mode light, and (5) the cooling on/off switch. 1) The digital display is an important part of the temperature controller.
7 Parts and Controls 7.2 4) The heater mode is a red light emitting diode (LED). This indicator lets the user visually see the ratio of heating to cooling. When the indicator is lit the heater is on, and when it is off the heater is off and the bath is cooling. 5) The cooling switch turns on the refrigeration for control below 50°C and rapid cool down. Bath Tank and Lid The bath tank and lid assembly includes: the tank, the control probe, the stirring motor, the access hole, and the access hole cover.
7 Parts and Controls 1 E US FUSE FUS E FUSE FUS F 4 RS-232 FUSE POWER 2 E US E FUSE F 3 DRAIN 5 Figure 3 Back Panel 1) The system fuses are 20 amp SB, 250V for 115 VAC operation and 10 amp ST, 250 V for 230 VAC operation. 2) The power cord is rated at 115 VAC, 20 amps. (230 VAC, 10 amps optional.) 3) A drain plug is provided for ease of removing the fluid media from the bath. Always use a container of adequate size to hold the FULL LOAD of fluid.
8 General Operation 8 General Operation 8.1 Bath Fluid Many fluids work with the CTR –80 bath. Choosing a fluid requires consideration of many important characteristics of the fluid. Among these are temperature range, viscosity, specific heat, thermal conductivity, thermal expansion, electrical resistivity, fluid lifetime, safety, and cost. If the viscosity becomes too great, the stirrer may not function. 8.1.
8 General Operation 8.1.4 Thermal Conductivity Thermal conductivity measures how easily heat flows through the fluid. Thermal conductivity of the fluid affects the control stability, temperature uniformity, and probe temperature settling time. Fluids with higher conductivity distribute heat more quickly and evenly improving bath performance. 8.1.5 Thermal Expansion Thermal expansion describes how the volume of the fluid changes with temperature.
8 General Operation flash point is the temperature at which there is sufficient vapor given off so that when there is sufficient oxygen present and a ignition source is applied the vapor will ignite. This does not necessarily mean that fire will be sustained at the flash point. The flash point may be either of the open cup or closed cup type. Either condition may occur in a bath situation. The closed cup temperature is always the lower of the two.
8 General Operation 8.1.10.3 Mineral Oil Mineral oil or paraffin oil is often used at moderate temperatures above the range of water. Mineral oil is relatively inexpensive. At lower temperatures mineral oil is quite viscous and control may be poor. At higher temperatures vapor emission becomes significant. The vapors may be dangerous and use of a fume hood is highly recommended.
8 General Operation Table 2 Table of Various Bath Fluids Viscosity (centistokes) Specific Gravity Specific Heat (cal/g/°C) Thermal Conductivity (cal/s/cm/°C) Thermal Expansion (cm/cm/°C) NONE 5.7 @ –50°C 0.8 @ 40°C 0.5 @ 70°C 1.71 @ 40°C 0.2 0.0004 0.0011 10°C (fl,cc) 12°C 1.3 @ –35°C 0.66 @ 0°C 0.45 @ 20°C 0.810 @ 0°C 0.792 @ 20°C 0.6 0.0005 @ 20°C 0.0014 @ 25°C 0°C (fr) 95°C (b) NONE 1 @ 25°C 0.4 @ 75°C 1.00 1.00 0.0014 0.
8 General Operation policies regarding flash points, toxicity, and such issues must be considered. You are responsible for reading the (material safety data sheets) and acting accordingly. 8.2 Stirring Stirring of the bath fluid is very important for stable temperature control. The fluid must be mixed well for good temperature uniformity and fast controller response. The stirrer is precisely adjusted for optimum performance. 8.3 Power Power to the bath is provided by an AC mains supply. See Section 3.
8 General Operation 8.5.1 Operation The bath controller automatically switches off cooling when the bath is operated above 50°C to protect the system from extreme pressures. The refrigeration system is also protected by a brownout and over voltage protection device that switches off power to the system when the line voltage is outside the safe operating range. The display indicates “LoLinE” when this condition exists.
8 General Operation The bath is operable within the temperature range given in the specifications. For protection against solid-state relay failure or other circuit failure, a thermocouple cutout automatically turns off the heater anytime the bath temperature exceeds the maximum temperature. The controller allows the operator to set the bath temperature with high resolution, adjust the proportional band, monitor the heater output power, and program the controller configuration and calibration parameters.
9 Controller Operation 9 Controller Operation This section discusses in detail how to operate the bath temperature controller using the front control panel. Using the front panel key-switches and LED display the user may monitor the bath temperature, set the temperature set-point in degrees C or F, monitor the heater output power, adjust the controller proportional band, and program the calibration parameters, operating parameters, and serial interface configuration.
9 Controller Operation Display Temperature SET + DOWN SET Select Setpoint Display of Rs Adjust Setpoint + SET UP Toggles °C / °F EXIT EXIT Units °C/°F Secondary Functions SET Scan On/Off + EXIT Cal Menu EXIT SET X5 Hard Cut-out Set Proportional Band Cut-out Adj. Hard Cut-out Set Cut-out Temp R0 Configuration Menu Adj. R0 EXIT Menu Legend: Press “SET” to step through the menu and to store the parameter value.
9 Controller Operation To set the temperature one must first select the set-point memory. This function is accessed from the temperature display function by pressing “SET”. The number of the set-point memory currently being used is shown at the left on the display followed by the current set-point value. 10.00C S Bath temperature in degrees Celsius Access set-point memory 1. 25.0 Set-point memory 1, 25°C currently used To change the set-point memory press “UP” or “DOWN”. 4. -25.
9 Controller Operation Un= C Scale units currently selected Press “UP” or “DOWN” to change the units. Un= F 9.3 New units selected Scan The scan rate can be set and enabled so that when the set-point is changed the bath heats or cools at a specified rate (degrees per minute) until it reaches the new set-point. With the scan disabled the bath heats or cools at the maximum possible rate. 9.3.
9 Controller Operation Press “SET” to accept the new scan rate and continue. S 9.4 Accept scan rate Secondary Menu Functions which are used less often are accessed within the secondary menu. The secondary menu is accessed by pressing “SET” and “EXIT” simultaneously and then releasing. The first function in the secondary menu is the heater power display. (See Figure 4 on page 36.) 9.5 Heater Power The temperature controller controls the temperature of the bath by pulsing the heater on and off.
9 Controller Operation down. In this way the temperature is maintained at a fairly constant temperature. The temperature stability of the bath and response time depend on the width of the proportional band. If the band is too wide the temperature will deviate excessively from the set-point due to varying external conditions. This is because the power output changes very little with temperature and the controller cannot respond very well to changing conditions or noise in the system.
9 Controller Operation 9.7 Cutout As a protection against software or hardware fault or user error, the bath is equipped with an adjustable cutout device that shuts off power to the heater if the temperature exceeds a set value. This protects the instrument, probes, and fluid from excessive temperatures. The cutout temperature is programmable by the operator from the front panel of the controller. The cutout should be set to the temperature limits of the selected fluid.
9 Controller Operation 9.8 Controller Configuration The controller has a number of configuration and operating options and calibration parameters which are programmable via the front panel. These are accessed from the secondary menu after the proportional band function by pressing “SET”. Pressing “SET” again enters the first of three sets of configuration parameters: operating parameters, serial interface parameters, and calibration parameters.
9 Controller Operation LL Low Limit parameter Press “SET” to enable adjustment of LL. LL L=-90 Flashes “ ” and then displays the setting Current LL setting Adjust the LL parameter using “UP” or “DOWN”. L=-20 New LL setting Press “SET” to accept the new temperature limit. 9.9.3 Cooling This menu function allows the operator to disable cooling and corresponds to the remote cooling control function (see Table 3).
9 Controller Operation 9.10.1 Baud Rate The baud rate is the first parameter in the menu. The baud rate setting determines the serial communications transmission rate. The baud rate parameter is indicated by, bAUd 2400 b Flashes “ ” and then displays the stetting Current BAUD rate The baud rate of the serial communications may be programmed to 300, 600, 1200, 2400, 4800, or 9600 baud. Use “UP” or “DOWN” to change the baud rate value.
9 Controller Operation dUPL d=FULL Flashes “dUPL” and then displays the setting Current duplex mode setting The mode may be changed using “UP” or “DOWN” and pressing “SET”. d=HALF 9.10.4 New duplex mode setting Linefeed The final parameter in the serial interface menu is the linefeed mode. This parameter enables (on) or disables (off) transmission of a linefeed character (LF, ASCII 10) after transmission of any carriage-return.
9 Controller Operation The calibration parameters R0, ALPHA, DELTA, and BETA characterize the resistance-temperature relationship of the platinum control sensor. These parameters may be adjusted by an experienced user to improve the accuracy of the bath. 9.11.1 Hard Cutout This parameter is the temperature above which the unit shuts down automatically. The parameter is set at the factory to approximately 120°C and can be changed only through the variable resistor.
10 Digital Communication Interface 10 Digital Communication Interface The CTR –80 Bath calibrator is capable of communicating with and being controlled by other equipment through the digital serial interface. With a digital interface the instrument may be connected to a computer or other equipment. This allows the user to set the set-point temperature, monitor the temperature, and access any of the other controller functions, all using remote communications equipment.
10 Digital Communication Interface 10.1.1 Wiring The serial communications cable attaches to the calibrator through the DB-9 connector at the back of the instrument. Figure 5 shows the pin-out of this connector and suggested cable wiring. To eliminate noise the serial cable should be shielded with low resistance between the connector (DB-9) and the shield. If the unit is used in a heavy industrial setting, the serial cable must be limited to ONE METER in length. 10.1.
10 Digital Communication Interface 10.1.2.2 Sample Period The sample period is the next parameter in the menu and prompted with “SPEr”. The sample period is the time period in seconds between temperature measurements transmitted from the serial interface. If the sample rate is set to 5, the instrument transmits the current measurement over the serial interface approximately every five seconds. The automatic sampling is disabled with a sample period of 0. Press “SET” to choose to set the sample period.
10 Digital Communication Interface Table 3 Controller Communications Commands Command Description Command Format Command Example Returned Returned Example set: 999.99 {C or F} set: 90.00 C Acceptable Values Display Temperature Read current set-point s[etpoint] s Set current set-point to n s[etpoint]=n s=80.00 Read temperature t[emperature] t t: 999.99 {C or F} t: 55.
10 Digital Communication Interface Controller Communications Commands continued Command Format Command Description Command Example Returned Returned Example Acceptable Values ON or OFF Set serial linefeed mode to on lf[eed]=on lf=on Set serial linefeed mode to off lf[eed]=of[f] lf=of Read R0 calibration parameter r[0] r Set R0 calibration parameter to n r[0]=n r=100.324 Read ALPHA calibration parameter al[pha] al Set ALPHA calibration parameter to n al=0.
11 Calibration Procedure 11 Calibration Procedure 11.1 Calibration Procedure Calibration of this instrument should be performed at regularly scheduled intervals by qualified authorized personnel in accordance with your company’s policy. Following is the recommended procedure for calibrating this instrument. 11.1.1 Calibration Equipment Calibration requires a standard thermometer that is adequately accurate and fits properly into one of the reference holes in the block.
11 Calibration Procedure • Set the set-point to 50°C and allow adequate time for the bath to reach this temperature and stabilize. Adjust the DELTA calibration parameter (see Section 9.11.4) to make the bath temperature as measured with the standard thermometer match the set-point. The approximate ratio between a change in DELTA and a change in temperature at 50°C is about 4.0 to 1. For example, if the bath temperature is high by 0.1°C at 50°C then decrease DELTA by 0.4.
12 Maintenance 12 Maintenance • The calibration instrument has been designed with the utmost care. Ease of operation and simplicity of maintenance have been a central theme in the product development. Therefore, with proper care the instrument should require very little maintenance. Avoid operating the instrument in dirty or dusty environments. • If the outside of the bath becomes soiled, it may be wiped clean with a damp cloth and mild detergent.
12 Maintenance tomer Service to be sure that the proposed method will not damage the equipment. • The condensing coil should be cleaned regularly. Inspect the coil through the vented rear panel. If any dust or dirt accumulation is visible, remove the rear panel to clean out the dust or dirt. Use a vacuum with a brush to remove the dirt. Do not use compressed air as it might drive the dirt between the fins where it may become lodged preventing airflow.
13 Trouble Shooting 13 Trouble Shooting If problems arise while operating the CTR –80, this section provides some suggestions that may help you solve the problem. A wiring diagram is also included. 13.1 Troubleshooting Below are several situations that may arise followed by suggested actions to take for fixing the problem. Incorrect Temperature Reading • Power the unit on and watch the display. If the first number displayed is less than “-0005-”, the unit has been re-initialized.
13 Trouble Shooting • If a High/Low voltage condition exists for longer than 5 seconds, the compressor will be de-energized. The controller display will flash “Lo LinE“ o and off while the condition exists. • Re-energization is automatic upon correction of the fault condition and after a delay cycle of about 2 minutes. High and Low Voltage Protection at 115 VAC Voltage Cutout: +/- 12.5 % (101 - 129 VAC) Voltage Cut-In: +/- 7.
W3 Blue 14 Green/Yel 14 W7 LID White/Blk 16 W16 1 2 3 2 3 3 3 1 2 3 N/C W18 White 16 W15 2 Brown 16 8 Set time delay to 2 minutes. 7 Adjust input voltage to 115/230 VAC. Secure setting. 4- All metal parts to be grounded. 3 System Fuses: For 115 VAC - 20 Amps 250 V Slow Blow. For 230 VAC - 10 Amps 250 V Slow Blow. 2 Heater Fuses: For 115 VAC - 6 Amps 250 V FB. For 230 VAC - 3 Amps 250 V FB.
