User manual EUTECH INSTRUMENTS ALPHA PH 200 REV 4

[. . . ] Instruction Manual lpha pH 200 1/8 DIN pH/ORP Controller Transmitter pH / mV / ºC 68X276101 | Rev. 4 | Feb 2008 PREFACE This manual serves to explain the use of the lpha pH 200 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 lpha pH 200 controller/transmitter as possible. If there are doubts in the use of the lpha pH 200 controller/transmitter, do not hesitate to contact your nearest lpha Authorized Distributor. [. . . ] If you are performing two-point calibration, proceed with the next step. MTC: MTC lets you select a specific value at which temperature will be compensated. 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. Press ENTER again to return to measurement mode. - 14 - 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. 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. - 15 - 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 - 16 - 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) 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. You can adjust it in 0. 01 increments from 0. 00 to 14. 00 pH (-999 to 1000 mV). Press ENTER to confirm and continue to step three of P1. 2. P1. 2: Set relay as high or low set point Select a low set point to activate controller when your value undershoots the set point; select a high set point to activate controller when your value overshoots the set point. Using both SP1 and SP2, you can select lo/lo, lo/hi, hi/lo or hi/hi set points. Press ENTER to confirm and continue to step 3 of P1. 3. - 17 - 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 de-activate till the measured pH value rises above pH 4. 50. The hysteresis window can be set to any value within the range shown below: · pH mode: 0. 00 to 2. 00 pH · ORP mode: 0 to 300 mV 1. Press and keys together (ESCAPE) to return to measurement mode. - 18 - 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) 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. [. . . ] However, since the reference electrode is grounded to the ground potential of the amplifier, electrical noise will be present only on the pH electrode. This noise is amplified along with the pH signal, which causes fluctuations in the pH or ORP readings. Electrical noise from a DC source (as in an electroplating tank) will typically result in stable but incorrect values. - 30 - Symmetrical mode: For noisy electrical environments, the alpha pH 200 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 EC100GTSO-05B. [. . . ]