Dwyer WPH2 - Manual (Page 3)

Temperature Unit Setting
To select the temperature unit (°F or °C) enter the setting mode first. Press to
select the unit setting. The default unit will flash on the LCD. Press to change
and press to confirm.
Reset to Default Setting
To reset the meter to default setting, enter the setting mode first. Press to select
reset. The default “no” will flash on the LCD. Press to change and press to
confirm. See diagram below.
Calibration Mode (CAL)
Calibration is necessary and should be done regularly. It is recommended that
calibration is done every day if the meter is used often. The unique calibration
design of the meter features automatic buffer recognition to avoid errors.
1. Rinse the probe thoroughly with de-ionized water or rinse solution. Do not wipe
the probe as this will cause a build-up of electrostatic charge on the glass surface.
2. Power on the meter.
3. Dip the probe into the standard calibration buffer. The end of the probe must be
completely immersed into the sample. Stir the probe gently to create a
homogenous sample. It is recommended to calibrate pH7 first and then 4 or 10 pH
for a better accuracy.
4. Press for >1 second to enter calibration mode. The “CAL” icon, auto
recognized buffer value (see table below) and “pH” will all flash on the primary LCD.
5. If the probe is damaged or the buffer is not specified as following, the primary
LCD will keep flashing unless you escape by turning off the meter.
The acceptable pH buffer range:
- pH3.00 to 5.00
- pH6.00 to 8.00
- pH8.50 to 10.50
6. If the probe successfully recognizes the buffer, the buffer pH value and “CAL” will
stop flashing.
7. If your calibration buffer is not NIST, press or to adjust the calibrating point
to the corresponding buffer value of specific temperature. The adjustable range is:
3.00 to 5.00, 6.00 to 8.00, and 8.50 to 10.50.
8. Wait for 30 seconds. If the reading is stable enough, the meter will complete the
calibration automatically.
9. Rinse the probe with de-ionized water or a rinse solution after calibration, Repeat
steps 3 to 8 to do multiple point calibration or exit by turning the meter off.
Probe Change
It is suggested that the probe be changed when:
1. Slow response
2. Unstable reading
3. Slope value is <75%, >115%, or the offset value is not between –60 to 60 mV.
Part number for the replacement electrode probe is WPH2-RS.
There are three steps to changing the probe:
1. Loosen the washer
2. Unplug the probe
3. Reverse the steps to install the new probe
Before calibration, it is recommended that you RESET the
meter to delete all the old calibration information. NOTICE
Temp (°C)
0
5
10
15
20
25
30
35
40
45
50 pH4.01
4.01
4.01
4.00
4.00
4.00
4.01
4.01
4.02
4.03
4.04
4.06 pH6.86
6.98
6.95
6.92
6.90
6.88
6.86
6.85
6.84
6.84
6.83
6.83 pH9.18
9.47
9.38
9.32
9.27
9.22
9.18
9.14
9.10
9.07
9.04
9.01
NIST
Be sure to calibrate the meter after changing the probe. NOTICE