Instruction Manual Alpha pH 190 1/8 DIN pH/ORP Controller Transmitter pH / mV / ºC 68X276106 | Rev.
Preface This manual serves to explain the use of the Alpha pH 190 controller/transmitter. This manual functions in two ways: firstly as a step-by-step guide to help you operate the meter; secondly as a handy reference guide. This manual is written to cover as many anticipated applications of the Alpha pH 190 controller/transmitter as possible. If there are doubts in the use of the Alpha pH 190 controller/transmitter, do not hesitate to contact your nearest Alpha Authorized Distributor.
TABLE OF CONTENTS 1 INTRODUCTION .................................................................... 1 2 SAFETY INFORMATION ....................................................... 2 3 OVERVIEW............................................................................. 3 3.1 3.2 3.3 3.4 4 FRONT PANEL.............................................................................. 3 BACK PANEL................................................................................ 4 WIRING ......................
1 INTRODUCTION Thank you for purchasing the Alpha pH 190 ⅛ DIN pH/ORP Controller. This controller is part of a series of quality process controllers available from Thermo Scientific. These sturdy, economical pH/ORP controllers are designed with the features and reliability of a much more expensive instrument. Your controller includes: • • Removable terminal blocks for easy connections; Two mounting brackets for easy panel mounting; When shipped, the controller is set to the pH mode. See Setup program P3.
2 SAFETY INFORMATION The Thermo Scientific Controller/Transmitter shall be installed and operated only in the manner specified in the Instruction manual. Only skilled, trained or authorized person should carry out installation, setup and operation of the instrument. Before powering up the unit, make sure that power source it is connected to, is as specified in the top label. Failure to do so may result in a permanent damage to the unit. The unit has live and exposed parts inside.
3 OVERVIEW 3.1 Front Panel The front panel consists of a 4-digit LED display, 8 LED annunciators and 4 keys. Annunciators 1. REL 1 2. REL 2 3. MEAS 4. CAL 5. SETUP 6. pH 7. oC 8. mV Displayed when Relay 1 is activated. Displayed when Relay 2 is activated. Displayed in measurement mode. Displayed in calibration mode. Displayed in setup mode. Unit of the displayed parameter (pH). Unit of the displayed parameter (temperature). Unit of the displayed parameter (ORP). Keys 9. MODE 10. CAL / ENTER 11.
3.2 Back Panel The back panel consists of four different connectors that can be used with removable terminal blocks (included): 19 D 18 17 16 14 13 9 8 7 6 Pt 100 - SENSE 10 Pt 100 - IN NC 11 Pt 100 - GND NC 4 NC NC 5 WARNING 12 B 15 pH/ORP 3 2 1 J2 J3 C J1 A L N GROUND LIQUID GND RELAY 2 - NC RELAY 2 - POLE RELAY 1 - NC RELAY 2 - NO RELAY 1 - POLE - 4 - 20 mA RELAY 1 - NO + 4 - 20 mA A. 3 pin connector (for power supply) B. 9 pin connector (for relays) C.
3.3 Wiring Caution: Ensure electrical mains are disconnected before proceeding. 1. Connect the power supply to the three-pin terminal block (A) VAC protective ground wire = 3 VAC neutral wire = 2 VAC live wire = 1 The Alpha pH 190 controller accepts voltages from 85 to 260 VAC, 50/60 Hz or DC. • • • 2. Connect the Pt 100 leads to terminals 13 and 15 (terminal block C). Either wire can be connected to either terminal. Terminals 13 and 14 must be shunted unless using a 3-wire RTD.
3.4 Panel-mounting the controller The supplied mounting hardware allows surface mounting to all panels and protective enclosures. Mounting cut-out size is 91 x 45 mm. To attach the mounting to the controller: 1. Align the catch to the side of the controller, and insert threaded rods through catch. BACK VIEW Threaded Threaded rod approx. 100 Catch Catch approx. 154.20 Wall pa 2. Screw the threaded-rod through the catch in a clock-wise direction.
4 MEASUREMENT MODE The Alpha pH 190 controller is capable of taking pH (or ORP) measurement with Automatic (ATC) or Manual (MTC) Temperature Compensation. The measurements are displayed distinguishingly by the annunciators on the front panel. 4.1 Measurement mode display Press the MODE key to toggle between pH (or ORP) and Temperature measurement mode. pH (ORP) measurement mode The controller starts up in the mode when last powered off (pH or ORP).The pH (or ORP) annunciator will light up.
2. 3. Press the ▲ or ▼ keys and adjust first relay set point. You can adjust it in 0.01 increments from 0.00 to 14.00 pH (-999 to 1000 mV). Press ENTER to confirm and return to the measurement mode. NOTE: Press ▲ and ▼ keys together (ESCAPE) at anytime, to return to Measurement mode. Set Point 2 (SP2) adjustment mode This lets you adjust the pH (or ORP) value in Set Point 2. If this value is crossed, the set point relay 2 LED will light. 1. 2. 3. Press the SP2/▲ key. The screen will scroll P2.
5 PASSWORD The Setup mode is to be accessed by entering a password code. The direct accessed Set Point adjustment mode (SP1 and SP2) and the Calibration mode can also be accessed through this password code procedure. The Alpha pH 190 controller features two separate passwords: • pH (or ORP) calibration mode and temperature offset password = 011 • Setup program password = 022 To enter the password: 1. Press the MODE key, and within 1 second, press the CAL/ENTER key. The display reads P.WRD. 2.
P. P.000 P.000 P.010 P.020 P.011 P.022 P.011 P.
6 PH CALIBRATION IMPORTANT: When Calibration mode is entered, controller automatically goes into a “HOLD” mode where the 4-20 mA output freezes and relays are de-activated (if it was in an activated condition). Upon return to measurement mode, both 4-20mA output and relay activities resume, depending on settings. The Alpha pH 190 controller features seven preset buffer values (pH 1.68, 4.01, 6.86, 7.00, 9.18, 10.01, 12.45) for quick autocalibration at one or two points.
NOTE: Buffer must be within ±1.5 pH of the value you are calibrating to or Err1 will be displayed flashing. To clear the Err1 display and return to calibration mode, press ▲ / ▼ keys together. NOTE: If the ATC mode has been selected and the Pt 100 is not connected or if it is broken, the pH display will flash. Under this condition, the calibration will not be allowed.
7.00 bUff ENTER 6.97 ENTER 7.00 done ENTER 10.01 bUff ENTER 10.03 ENTER 10.
If you are performing a 1-point calibration, press the ▲ and ▼keys together to return to measurement mode. If you are performing a two-point calibration, proceed with the next step. 1. Use ▲ or ▼keys to select the next buffer value (pH 1.68, 4.01, 9.18, 10.01 and 12.45). 2. Make sure the electrode is in the correct buffer solution. Allow the electrode time to stabilize. 3. Press ENTER. The instrument blinks with the un-calibrated pH value corresponding to the mV output of your pH probe.
7 ORP CALIBRATION IMPORTANT: When Calibration mode is entered, controller automatically goes into a “HOLD” mode where the 4-20 mA output freezes and relays are de-activated (if it was in an activated condition). Upon return to measurement mode, both 4-20mA output and relay activities resume, depending on settings. mV (ORP) values may be offset at up to ±150 mV to agree with a calibration solution or an established work standard. 1.
8 TEMPERATURE CALIBRATION IMPORTANT: When Calibration mode is entered, controller automatically goes into a “HOLD” mode where the 4-20 mA output freezes and relays are de-activated (if it was in an activated condition). Upon return to measurement mode, both 4-20mA output and relay activities resume, depending on settings. This controller features selectable Automatic Temperature Compensation (ATC) or Manual Temperature Compensation (MTC). ATC: ATC mode requires a Pt 100 temperature element.
9 SETUP MODE 9.1 General Information IMPORTANT: When Setup mode is entered, the controller automatically goes into a “HOLD” mode where the 4-20 mA output freezes and the relays are de-activated (if it was in an activated condition). Upon return to the measurement mode, both the 4-20mA output and relay activities resume, depending on the settings. To enter setup mode: 1. Key in the password “022” using the method described in section 5. 2. Press the ▲ or ▼ keys to display the various sub-menus shown here. 3.
9.2 Setup mode overview P1.0: Set Point 1 P1.1: select relay 1 set point value P1.2: select relay 1 as low or high set point P1.3: set relay 1 hysteresis value P2.0: Set Point 2 P2.1: select relay 2 set point value P2.2: select relay 2 as low or high set point P2.3: set relay 2 hysteresis value P3.0: Configuration P3.1: select pH or ORP units P3.2: select symmetrical or asymmetrical input mode P3.3: select temperature compensation (MTC or ATC) P4.0: Calibration data P4.1: view first calibration point P4.
9.3 Set Point 1 – P1.0 Setup program P1.0 allows you to set parameters for relay 1. P1.1: select relay 1 set point value P1.2: select relay 1 as low or high set point P1.3: set relay 1 hysteresis value (dead band) P1.0 SP 1 P1.1 SP 1 4.00 P1.2 P1.3 SP 1 HYS 1 LOW 1.00 HIGH Press ▲ and ▼ keys together (ESCAPE) at anytime, to leave the Setup mode and return to Measurement mode. P1.1: Select relay set point value This lets you choose the pH (or ORP) value that will cause your controller to activate.
P1.3: Set Hysteresis value Hysteresis prevents rapid contact switching if your value is fluctuating near the set point. Once activated, the relay will not return to resting position until the measured value has passed through the set point plus hysteresis value. Example: With a low set point of 4.00 and a hysteresis value of 0.5, the relay will activate at pH values below 4.00, but will not deactivate till the measured pH value rises above pH 4.50.
9.4 Set Point 2 – P2.0 Setup program P2.0 allows you to set parameters for relay 2. P2.1: select relay 2 set point value P2.2: select relay 2 as low or high set point P2.3: set relay 2 hysteresis value (dead band) P2.0 SP 2 P2.1 SP 2 10.00 P2.2 P2.3 SP 2 HYS2 LOW 1.00 HIGH Press ▲ and ▼ keys together (ESCAPE) at anytime, to leave the Setup mode and return to Measurement mode. P2.1: Select relay set point value This lets you choose the pH (or ORP) value that will cause your controller to activate.
P2.3: Set Hysteresis value Hysteresis prevents rapid contact switching if your value is fluctuating near the set point. Once activated, the relay will not return to resting position until the measured value has passed through the set point plus hysteresis value. Example: With a high set point of 10.00 and a hysteresis value of 0.5, the relay will activate at pH values above 10.00, but will not deactivate till the measured pH value decreases below pH 9.50.
9.5 Configuration – P3.0 Setup program P3.0 let you configure controller parameters. P3.1: select pH or ORP mode of operation P3.2: select symmetrical or asymmetrical input mode P3.3: select temperature compensation (manual or automatic) P3.0 CONF P3.1 PH ORP P3.2 ASYM SYM P3.3 MTC aTC Press ▲ and ▼ keys together (ESCAPE) at anytime, to leave the Setup mode and return to Measurement mode. P3.1: Select pH or ORP This lets you set the controller to take pH or ORP measurements. 1. 2. 3. 4. 5.
P3.3: Select temperature compensation This controller features selectable automatic temperature compensation (ATC) or manual temperature compensation (MTC). ATC automatically compensates for temperature fluctuations; MTC let you select a specific value at which temperature will be compensated. ATC readings require a temperature sensor. 1. 2. 3. 4. 5. Key in the password “022” as per procedure in Section 5. Press ▲ key twice. The screen will scroll P3.0 and CONF. Press ENTER three times.
9.6 Viewing Calibration points: pH or ORP – P4.0 Setup program P4.0 lets you view the current points at which the controller is calibrated. This is a “view only” parameter. P4.1: first calibration point P4.2: second calibration point (pH only) When controller has no calibration points in memory, the display will show “-------“. pH P4.0 CAL P4.1 7.00 P4.2 4.01 ORP P4.0 CAL P4.1 180 Press ▲ and ▼ keys together (ESCAPE) at anytime, to leave the Setup mode and return to Measurement mode. P4.
9.7 Viewing pH Electrode Data – P5.0 In pH mode, Program 5 has three “view only” options that lets you check the electrode parameters for diagnostic purposes. P5.1: view pH electrode offset P5.2: view pH electrode slope P5.3: view temperature probe offset (ATC on only) These parameters will change each time you recalibrate the controller. P5.0 elec P5.1 p.ofs 0.5 P5.2 P5.3 Slpe t.ofs 592 . 0.0 Press ▲ and ▼ keys together (ESCAPE) at anytime, to leave the Setup mode and return to Measurement mode. P5.
9.8 Viewing ORP Electrode Data – P5.0 In ORP mode, Program 5 has two “view only” options that lets you check the electrode parameters for diagnostic purposes. P5.1: view ORP electrode offset P5.2: view temperature probe offset (ATC on only) These parameters will change each time you recalibrate the controller. P5.0 elec P5.1 M.ofs -5 P5.2 t.ofs 0.0 Press ▲ and ▼ keys together (ESCAPE) at anytime, to leave the Setup mode and return to Measurement mode. P5.0: Viewing ORP electrode data 1.
9.9 Controller Reset – P6.0 This parameter lets you reset the controller. All pH and ORP calibration data will be cleared, and all Setup parameters revert to factory default values. Temperature mode (ATC or MTC) and calibration data remains unchanged. P6.0 RsT P6.1 n0 yeS Press ▲ and ▼ keys together (ESCAPE) at anytime, to leave the Setup mode and return to Measurement mode. P6.0: Controller reset 1. Key in the password “022” as per procedure in Section 5. 2. Press ▲ key five times.
10 RELAYS The Alpha pH 190 features two SPDT non-powered relays; rated for 6A at 110 VAC, 250 VAC maximum. When your process exceeds the set parameters of a relay set point, the REL 1 or REL 2 indicator lights up. To set parameters for relay 1 and relay 2, see Setup programs P1.0 and P2.0. 11 TRANSMITTER FUNCTION If remote data logging is required, a 4-20 mA current loop can be connected. The current will be proportional to the pH (or ORP) displayed on the panel display. pH: 0.00 pH – 4 mA; 14.
13 SPECIFICATIONS pH Range Resolution/Accuracy mV Range Resolution/Accuracy Temperature Resolution/Accuracy Sensor Temperature Compensation Set-point And Controller Functions Function Switching pH/ORP Hysteresis Contact Outputs, Controller Switching Voltage / Current / Power Electrical Data And Connections Power Requirements Signal Output / Load pH / ORP Input Connection Terminals 0.00 to 14.00 pH 0.01 / ± 0.01 pH -999 to 1000 mV 1 / ± 2 mV -10 to 110 oC 0.1 / ± 0.
14 ACCESSORIES Product Description pH Combination Electrode with Pt 100 RTD and PMP pH Combination Electrode with HF resistant glass (w/o ATC & PMP) pH Combination Electrode with PMP (w/o ATC) pH Combination Electrode with high temperature (110 oC) and high pressure resistance (9 bar) (w/o ATC & PMP) pH Combination Electrode (w/o ATC & PMP) ORP Gold Electrode with PMP but w/o ATC ORP Platinum Electrode with PMP but w/o ATC Note: Code no.
Appendix 1: Asymmetrical / Symmetrical Mode The Alpha pH 190 controller can be operated in the asymmetrical or symmetrical modes (See Set up Program P3.2). Asymmetrical mode: Asymmetrical mode works well in environments where there is little or no electrical noise. When there is noise, the noise acts as a common signal, which is picked up by both the pH and the reference electrodes.
Symmetrical mode: For noisy electrical environments, the alpha pH 190 controller offers Symmetrical Mode operation. To take advantage of Symmetrical operation, you must have an electrode with a solution ground (potential matching) pin, such as the EC-ARGTSO-05B or EC-100GTSO-05B. If your electrode does not have a solution ground, be sure to set the controller to Asymmetrical mode. Symmetrical mode avoids grounding the reference electrode by reconfiguring the input to a floating differential mode.
Appendix 2: Simple Explanation on the Function of Hysteresis SP1 Set to LO SP2 Set to HI RELAY ON RELAY OFF 4.0 4.5 9.5 7.0 FORWARD DIRECTION REVERSE DIRECTION 10.0 SP2 SP1 HYSTERESIS BAND (DEFAULT = 0.5 pH) The controller relay activates when the set-point is reached. In the reverse direction, it does not de-activate when the value reaches the set-point. Instead, it continues to be active till the value reaches the amount set by the Hysteresis band.
Appendix 4: External Relays The relays on the Alpha pH 190 series controller are rated for 6 amps at 110 VAC and can be wired directly to your final control element (provided its power requirements does not exceed this). However, to preserve the life of your controller, or if higher power is needed, it is recommended that you use the controller relay to drive an external relay. Diagram below shows a typical installation. Wiring should be changed appropriately if normally closed (N.C.) operation is desired.
15 GENERAL INFORMATION Warranty Thermo Scientific warrants this product to be free from significant deviations in material and workmanship for a period of one year from the date of purchase. If repair is necessary and has not been the result of abuse or misuse within the warranty period, please return by freight pre-paid and amendment will be made without any charge. Thermo Scientific’s Customer Service Dept. will determine if product problem is due to deviations or customer abuse.
For more information on Thermo Scientific products, contact your nearest distributor or visit our website listed below: Thermo Scientific Water Analysis Environmental Instruments Blk 55, Ayer Rajah Crescent, #04-16/24 Singapore 139949 Tel: (65) 6778 6876 Fax: (65) 6773 0836 E-mail: eutech@thermofisher.com Web-site: http://www.thermo.com/process Distributed by: Oakton Instruments P.O Box 5136, Vernon Hills, IL 60061, USA Tel (in U.S.): 888-462-5866 Tel (outside U.S.
