MRC INE-PHB-4 - Operation and Calibration; 4.3 Temperature calibration; 4.4 First point calibration

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2.1 Normal operating conditions:
(1) Ambient temperature: 5℃~35℃
(2)Relative humidity: Not more than 80%
(3)Temperature of measured solution: 5℃~60℃
(4)Power supply: two pieces of 5V batteries
(5)No obvious vibration
(6) No strong electromagnetic interference except the geomagnetic field.
3. Construction
1- Electrode socket
2- Electrode rack
3- Screen
4- Power ON/OFF
5- Increase key
6- Reduce key
7 - Mode key
8 - Confirm key
9 - Background light
4. Operation
The meter works on two pieces of 5V battery. Open the battery cover on the
backboard of the meter and insert the battery.
Please calibrate before measuring pH value. No need to calibrate in each
operation. In general, calibration is needed once a day when the measuring
interval is comparatively short.
The meter has two points calibration. The procedure is as following:
4.1 Press “ON/OFF” button to switch on the battery supply. the meter enter
“mV” measuring state;
4.2 Press “MODE” button to enter temperature measuring state, the “℃ ”
indicating light flashes. The model circuit is as following:
mV measurement (displaying MEAS and mV)
temperature setting (the “℃” light is flashing)
pH calibration 1(displaying STD1)
pH calibration 2(displaying STD2)
pH measuring (displaying MEAS and pH)
4.3 Press “▲” or “▼” button to adjust temperature value when the displayed
temperature value is the same as the temperature value of calibrated
solution, press “ENTER” button to store it into the meter. The “℃ ”
indicating light stops flashing at this time.
4.4 Press “MODE” button, the meter display “STD1” to enter the first
calibration point (if you don’t need calibration, press “MODE” two times,
the meter display “MEAS” enter PH measurement directly);