11
7+Series Version 2.0
Customer calibration
example of 1.60pH and 6.50pH calibration solution
Select CUS in the setup menu P1.1 (please refer to clause 7.3 for customer-defined solution). The meter enters into
Customer-defined calibration mode. Press key, the meter’s display show a blinking CAL1 icon at the top right of
LCD, indicating the meter enters into the 1
st
point customer-defined calibration.
Rinse pH electrode in pure water, allow it to dry, and submerge it in pH1.60 buffer solution. Stir the solution briefly and
allow it to stay in the buffer solution until a stable reading is reached. For automatic temperature compensation (ATC),
the temperature value does not blink. When press key, the main value blinks.
Press and keys to adjust the main value to 1.60, then press key to calibrate the meter. After calibration
is done, LCD at the top right shows blinking CAL2 icon, indicating the meter enters into the 2
nd
point customer-defined
calibration.
Note: For manual temperature compensation (MTC), when LCD displays the stable measuring value and icon,
press key, then the temperature value blinks, press and keys to adjust the
temperature value, and press key to confirm it. Then the main value blinks. Follow the above procedures to
adjust the main value and calibrate the meter.
Rinse pH electrode in pure water, allow it to dry, and submerge it in pH 6.50 buffer solution. Stir the solution briefly and
allow it to stay in the buffer solution until a stable reading is reached. For automatic temperature compensation (ATC),
the temperature value does not blink. When press key, the main value blinks.
Press and keys to adjust the main value to 6.50, then press key to calibrate the meter. After calibration
is done, the meter goes to the measurement mode. For customer-defined calibration, LCD does not show electrode
calibration guide icons.
Note: For manual temperature compensation (MTC), when LCD displays the stable measuring value and icon,
press key, then the temperature value blinks, press and key to adjust the temperature value, and
press key to confirm it. Then the main value blinks. Follow the above procedures to adjust the main value and
calibrate the meter.
The meter can perform 1-2 point customer-defined calibration. When the 1
st
point calibration is done,
press key, the meter exits from calibration mode. This is one-point customer-defined calibration.
As for the standard calibration the meter show on the LCD one or more icons indicating the suited range
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