Nova-Tech pH-CON 300 - Manual (Page 9)

17 16
Temperature calibration
1. Make sure the conductivity cell (or
alternative temperature element) is
attached to the 6-pin connector.
2. Switch the meter on. The ATC annuncia-
tor will appear at the right-hand side of
the LCD.
3. Press the CAL/MEAS key to enter
calibration mode (either pH or
conductivity). The CAL indicator will
appear above the primary display.
4. While in calibration mode, press
the MODE key to enter temperature
calibration mode. The primary display
shows the last set temperature value and
the secondary display shows the temper-
ature reading with zero offset.
See figure
5. Dip the ATC element into a solution of
known temperature (i.e. a temperature
bath). Allow time for the temperature
element to stabilize.
6. Scroll with the ▼ and ▲ keys to set
the correct temperature value (i.e. the
temperature of the temperature bath).
You can adjust the reading in increments
of 0.1°C.
See figure
7. Once you have selected the correct
temperature, press the ENTER key.
The meter automatically returns to
pH measurement mode.
Temperature calibration
The temperature sensor (located in the conductivity cell) is factory calibrated.
Calibrate your sensor only if you suspect sensor drift that may have occurred
over a long period of time or if you have a replacement probe.
4.5
ATC
CAL
F
B
B
ATC
CAL
F
A
A
Notes
• You can offset the temperature reading up to ±5°C from the original reading.
• To exit this program without confirming the temperature calibration value, DO NOT
press ENTER in step 7. Press CAL/MEAS instead.
5. Measurement
To take readings:
1. Rinse the pH electrode with deionized
or distilled water before use to remove
any impurities adhering to the probe
body. If the pH electrode has dehydrated,
soak it for 30 minutes in electrode storage
solution or a 2M–4M KCl solution.
2. Press ON to switch on meter.
3. Press the MODE key to select pH
measurement mode. The MEAS annun-
ciator appears on the top center of the
LCD. The ATC indicator appears in the
lower right hand corner to indicate
Automatic Temperature Compensation.
See figure
NOTE: For pH manual temperature
compensation, you must disconnect the
conductivity cell from the 6-pin connector.
The ATC indicator will disappear from
the display. You also need to set a manual
temperature compensation value—see page
22 for directions.
4. Dip the pH electrode into the sample.
Since the conductivity cell contains the
temperature sensor, make sure it is also
immersed in your solution.
When dipping the probe into the sample,
the sensor or the glass bulb of the electrode
must be completely immersed into the
sample. Stir the probe gently in the sample
to create a homogenous sample.
5. Allow time for the reading to stabilize.
Note the reading on the display. If the
Ready indicator is selected on, it will
appear when the reading is stable. See
page 20 for more information.
6. Press the MODE key to toggle between
pH and conductivity readings.
Taking pH Measurements 5.1
ATC
READY
MEAS
C
pH
A
A
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