Dwyer WPH2 - Manual (Page 2)

- The first display shows the measured pH reading.
- The second display shows the temperature reading (Degree C or F).
- CAL = Calibration mode
- HLD = Data hold
- Battery icon indicates low power
- uS/ppt/ppm/mS/mV are units not used for this pen. Only pH will be used
Keypad
-Press to power on/off the meter.
- Press >2 seconds to enter setting mode before power on.
- Press with “HOLD” key to disable auto sleep function before power
on.
- Press to enter calibration mode.
- Press to save and enter next step while in setting mode.
- Press to adjust while in calibration mode.
- Press to freeze the current reading.
- Press again to release hold.
- Press to adjust while in setting or calibration mode.
Operation
1. Remove the probe cover from the meter.
2. Rotate the transparent cap to expose the electrode (see diagram below).
3. Dip the electrode into the test solution. Press to power on the meter and stir it
to get a stable reading.
4. “pH” flashes while the meter is in measurement mode. The LCD shows the
measured pH and temperature. “pH” stops flashing when the reading is stable.
5. Press key to freeze current reading. “HLD” appears on the LCD. Press key
again to release.
6. Turn off the meter by pressing the button.
7. Once finished with the measurement, clean the electrode. Put the transparent
electrode cap and meter cover back on.
Auto Power Off (Sleep Function)
This meter will shut off automatically after 20 minutes of inactivity. For a longer
operating time, you can disable sleep mode.
To disable the auto power off:
Before powering on, press and simultaneously until an “n” appears on the
screen. Then release the keys to return to normal mode.
Program Settings
Parameters setting function could help you to check or program your meter.
When the meter is off, press key >1 second to enter setting mode.
Probe slope and offset value
After re-calibration, checking probe slope and offset value could help to confirm the
necessity to replace the probe.
While doing 3 points calibration, there are two available slope values and one offset
point:
Range 1 (SL1): 0.00 to 2nd point
Range 2 (SL2): 2nd point to 14.00 pH. Offset point is at pH7.
While doing 1 or 2 points calibration, the slope value SL1 equals that of SL2. The
offset point is still at pH7.
When the meter is off, press for >1 second to enter setting mode. The SL1 value
will appear on the LCD. Press to view the SL2 value. Press to view the offset
value. See diagram below.
The disable sleep mode will be invalid after every power off. NOTICE
For pH meters, please always make the electrode wet to keep
the electrode in a good storage condition. WARNING
Change the probe while the slope value is <75 or >115 %. Also,
change the probe if the offset value is not between -60 to 60 mV. NOTICE