User manual EUTECH INSTRUMENTS ALPHA PH 190 18 DIN PHORP CONTROLLERTRANSMITTER

[. . . ] Instruction Manual lpha pH 190 1/8 DIN pH / ORP Controller with Temperature display and Transmitter Technology Made Easy . . . 68X276106 Rev 0 11/2004 Preface This manual serves to explain the use of the lpha pH 190 controller/transmitter. This manual functions in two ways: first, as a step-by-step guide to help you operate the meter; second, it serves as a handy reference guide. This manual is written to cover as many anticipated applications of the lpha pH 190 controller/transmitter as possible. If there are doubts in the use of the lpha pH 190 controller/transmitter, do not hesitate to contact the nearest Eutech Instruments Authorized Distributor. [. . . ] Important: If there is no temperature element wired to the controller and ATC is selected on, the screen will flash in pH or ORP mode, and you will see an error message (OR) in temperature mode. MTC: MTC lets you select a specific value at which temperature will be compensated. You can select a manual temperature value from ­ 10 to 110oC. See Setup program P3. 3 for instructions on ATC or MTC selection. The display shows MTC or ATC, then the temperature. Press CAL / ENTER key to directly access the offset mode when the unit is in temperature measurement mode. NOTE: Instead of pressing the CAL/ENTER key, you can also enter the offset mode using the password code procedure as explained in Section 5. The screen will flash the current oC reading. For ATC: Determine the temperature of your solution with an accurate meter (such as the Temp 5). Press the or keys to offset the oC value on the controller display to match the value of the solution you are measuring. For MTC: Press the or keys to offset the oC value on the controller display to match the desired value. The display flashes "DONE" ENTER and return to the temperature measurement mode. 22. 5 25. 0 dn oe - 15 - 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. Key in the password "022" using the method described in section 5. Press the or keys to display the various sub-menus shown here. When a sub-menu item is displayed, press the ENTER key to enter that submenu. Press and keys together (ESCAPE) to leave the Setup mode and return to Measurement mode. P . 0 1 P . 0 2 P . 0 3 P . 0 6 P . 0 5 P . 0 4 - 16 - 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. 2: view second calibration point (pH mode only) P5. 0: Electrode data P5. 1: view electrode offset P5. 2: view electrode slope (pH mode only) P5. 3: view temperature probe offset (ATC mode only) P6. 0 Controller reset P6. 1: clear calibration data and revert to factory default settings - 17 - 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) P . 0 1 S1 P P . 1 1 S1 P 4 . 00 P . 2 1 P. 13 S1 P H S1 Y LOW 10 . 0 HI H G 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. If this value is crossed, the set point relay 1 LED will light. Key in the password "022" as per procedure in Section 5. [. . . ] The electrical noise appears equally on the pH and reference electrodes, and is therefore rejected by the operational amplifier. - 32 - Appendix 2: Simple Explanation on the Function of Hysteresis SP1 Set to LO SP2 Set to HI RELAY ON RELAY OFF 4. 0 SP1 4. 5 7. 0 9. 5 10. 0 SP2 FORWARD DIRECTION REVERSE DIRECTION HYSTERESIS BAND (DEFAULT = 0. 5 pH) The controller relay activates when the set-point is reached. In the reverse direction, it does not deactivate 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 3: Factory Defaults Resetting the controller to factory default settings (See program P6. 0) clears all calibration data and most other setup functions. The following settings will remain unchanged: 1. [. . . ]