.
- 5 -
IV. OPERATING INSTRUCTIONS
A.
TEMPERATURE COMPENSATION
- pH measurement.
Note: The meter is factory set for a solution temperature of 77°F/25°C.
1. Manual Temperature Compensation for pH Measurement
•
Slide the
LOCK SWITCH
to the locked position and press the
POWER
button. The LCD flashes momentarily.
•
The temperature is shown in the lower display
(Fig.2). Press the
°C/°F
button to select the
desired unit of measure.
•
Press the
TEMP.C
button to adjust the manual
temperature compensation by using the
LEFT
,
UP
and
DOWN
buttons.
•
Press the
TEMP.C
button 3 times to return to the measuring mode.
2. Automatic Temperature Compensation (ATC) for pH Measurement
•
Connect the pH electrode to the
BNC SOCKET
. Plug the ATC probe into
the
OPTIONAL PROBE INPUT SOCKET
. Slide the
LOCK SWITCH
to the
locked position and press the
POWER
button. The LCD flashes momen-
tarily.
•
Press the
PH/MV
button and select the pH mode. "PH" is displayed on the
LCD.
•
Insert both probes into the solution. The pH measurement will be automati-
cally compensated for temperature.
B. PH CALIBRATION PROCEDURES
The meter is factory calibrated to simulate the ideal pH electrode (0 mV at pH
7.00 and 177.4 mV at PH 4, based on an ambient temperature of 77°F/25
°
C ).
1. Electronic Calibration of the Meter Only (without buffers)
•
If applicable detach the ATC probe. Slide the
LOCK SWITCH
to the locked
position and press the
POWER
button. The LCD flashes momentarily.
•
Attach the pH probe to the
BNC SOCKET
and press the
PH/MV
button to
select the pH mode ("PH" is displayed on the LCD).
•
To adjust the pH 4 default value, press the
TEMP.C
button twice. The upper display will show "4.00"
and the lower display will show the pH 4 default
calibration value (Fig.3). Use the
UP
and
DOWN
buttons to adjust the value.
Fig. 3
PH
4.00
04.03
Fig. 2
PH
026.1 °C
See Fig.1, Pg.4 for inputs & button locations
