Yokogawa EXA PH202 2-Wire pH/ORP Analyzer - Manual (Page 112)

IM 12B07D02-01E
Appendix 11-15
When the OR8EFG or OR8ERG sensor is used, set both INPUT1 and INPUT2 to the low impedance
measurement. Confirm the position of the jumper cable of the wiring diagram.
11 12 14 17 13 15 16
HIGH IMP LOW IMP
SUPPLY TEMP LE INPUT 2 INPUT 1
Setting for ORP
The temperature compensation of the impedance measurement is for conventional pH glass sensors.
When other sensors are used, switch this feature off.
11-6-3. Supplement of temperature sensor
When the temperature sensor is not connected with the transmitter (when no connections are made
to terminals 11 and 12), set the manual temperature compensation (refer to Section 5-1-1).
Yokogawa’s pH sensors, Models HA405, DPA405, DPAS405 and HF405, do not have a built-in
temperature sensor.
11-6-4. Auto-Return
Manual HOLD is automatically turned OFF.
Calibration mode or Commissioning mode is changed to Measurement mode automatically.
If no key is operated for 10 minutes in any mode other than measurement mode or after 10 minutes
in Hold status, Auto-Return (factory setting: On (1) in service code 50) will be activated to return the
transmitter to measurement mode. To disable Auto-Return, set the service code 50 to Off (0) .
If you disable Auto-Return function then the transmitter does not automatically return to Measurement
Mode. You need to press [MODE] key to return to Measurement mode.
11-6-5. CALEND
After CAL.END appears once during calibration, it blinks and calibration starts again.
For the PH202, even after CAL.END is displayed, a measurement stability check continues for the
time interval set by service code 20. If the reading changes significantly* during this interval*, then
recalibration will start automatically. In auto-calibration mode (AUT.CAL) immediately after CAL.END
is displayed, you can press YES or NO within time interval set by service code 20 to confirm or reject
(repeat) the reading.
This applies to both calibration points.
1. If the reading does not stabilize (and CAL.END appear) within 10 minutes of start of calibration,
then error E1 (measurement unstable during calibration) is generated.
2. If you press YES or NO then you can continue immediately to the next step.
3. If you don't press YES or NO and the pH is stable (within (pH) for time interval (t)), then calibration
continues to the next step.
11-6-6. How to cancel sample calibration
T03.ai
In case of stopping calibration at data aquisition situation
(waiting for measured value input with blinking "SAMPLE")
after sample calibration start, cancel the calibration in accordance
with the right table.
Indication on LCD
"SAMPLE" blink
"LAB.CAL" light
"SAMPLE" light
"S. ON" light
"S.OFF" light
Key Operation
Push "MODE" key
Push "NO" key
Push "YES" key
Push "NO" key
Push "YES" key
CAUTION