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6.3 Temperature Calibration:
1. Select the function in mV and connect the temperature plug.
2. Sliding the "CAL" switch to right to enter calibration procedure.
3. Put pH electrode into a standard which is 25.0±10°C (or 77.0±18°F) and the temperature
is stable, if the temperature is inaccurate, LCD will show E5, please check value of tem-
perature.(Fig-13)
4. Waiting for the reading to be stable. (Fig-14)
5. Press and hold down "SET" button for more than 2 seconds to enter the temperature cali-
bration, and the sub (Temp.) display blanking, (Fig-15)
(Fig-13)
6. The preset value is 25.0°C (or 77.0°F) or user can press " " or " " button which are
printed in white sign to increase or decrease the determined value in LCD. Press and hold
down "SET" button for more than 2 seconds to complete 25.0°C (or 77.0°F) calibration,
and LCD will show SA. (Fig-16, Fig-17)
7. Put pH electrode into a standard which is 70.0±10°C (or 158.0±18°F) and the
temperature is stabled, repeat steps 3 to 6.
8. If you complete steps 1 to 7, the LCD will show CAL(main display) and End(sub dis-
play). (Fig-18)
9. Sliding the "CAL" switch to left to leave calibration procedure.
(Fig-14)
(Fig-15)
(Fig-16)
(Fig-17)
(Fig-18)
6
4.1.4 "MEAS" Button:
It can turn on or off the meter by pressing "MEAS" button, power is automatically turn
off if no operation for a period of 10 min.
4.2 Switch Functions
4.2.1 "°C/°F" Switch:
It can select the temperature unit by sliding the switch. If intend to measure the "°C",
then slide the switch to left. If intend to measure the "°F", then slide the switch to right.
4.2.2 "CAL" Switch:
It can enter the calibration procedure by sliding the switch to right.
5. pH Temperature Compensation
Enable the meter to read solutions at various temperatures, the meter will make the cor-
rect electrode's temperature dependency to measure the pH value. The compensation may
be manual with two buttons adjustment on the meter, or it may be automatic with pH elec-
trode's temperature sensor immersed in test solution.
5.1 Temperature Compensation Mode:
5.1.1 Automatic Temperature Compensation:
Connecting the 3.5mm temperature plug into earphone and the pH function will be tem-
perature compensated automatically.
5.1.2 Manual Temperature Compensation:
Take the 3.5mm temperature plug away then press and hold down the "SET" button
which are printed in white word on the overlay for more then 2 seconds to enter tempera-
ture compensation mode between 0.0°C and 100.0°C (32.0°F to 212°F). The preset tem-
perature is 25.0°C (77.0°F), press " " or " " which are printed in white sign to increase
or decrease the compensation temperature. Pressing and hold down "SET" button more
than 2 seconds to complete the temperature.
6. Calibration Procedure
6.1 pH Calibration With Automatic Temperature Compensation(ATC):
1. Connect the 3.5mm temperature plug into earphone. Select the function in pH(ATC)/ °C.
(or °F) Slide the switch °C/°F to select the temperature unit.
2. Sliding the "CAL" switch to right to enter calibration procedure.
3. Put pH electrode into buffer solution pH4.01 and agitate the buffer solution.
If the solution is inaccurate, LCD will show E4, please check value of buffer solution.
(Fig-1)
4. Wait for the reading to be stable. (Fig-2)
(Fig-1)
(Fig-2)
3
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