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. [. . . ] The display blinks the calibrated value twice and flashes "DONE". Press ENTER again to return to measurement mode. NOTE: Buffer must be within ±1. 0 pH of the value you are calibrating to, or Err1 will display. To clear the Err1 display and return to calibration mode, press the and keys together. The slope and offset are re-determined after each calibration. - 13 - 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. Press CAL / ENTER key to directly access the Calibration mode when the unit is in ORP measurement mode. NOTE: Instead of pressing the CAL/ENTER key, you can also enter the Calibration mode using the password code procedure as explained in Section 5. Determine the mV value of your solution with an accurate meter (such as the pH 6). Press the or keys to offset the mV value on the controller display to match the value of the solution you are measuring. Press ENTER again to return to measurement mode. NOTE: You can view the mV offset in the Setup program, P5. 0. 180 200 ENTER do ne - 14 - 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). 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. 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. 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. [. . . ] 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. - 31 - 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 EC100GTSO-05B. [. . . ]