Horiba Scientific LAQUA F-73A-S Instruction Manual page 108

(2) Linearity check
pH0.000
pH4.000
pH7.000
pH10.000
pH14.000
(3) Indication check by inputting high impedance
Input pH0.000
Input pH14.000
(4) Temperature indication check
The displayed pH values at this time have nothing to do with the check result.
0.0C
30.0C
60.0C
100.0C
When the measurement and check is completed, the result data is displayed.
Result data output
● OK/CHECK
OK (satisfies regulation requirements)
CHECK (does not satisfy regulation requirements)
● Calibration
● Asymmetric potential (within regulated value ±3 mV)
● Sensitivity (99% to 101% of regulated value)
● Linearity
Indication error at each input (regulated value ±0.010 pH ±1 digit)
● High impedance
Indication error at each input (regulated value ±0.030 pH ±1 digit)
● Temperature Indication error at each input (regulated value ±0.4C)
When the judgment of "CHECK" is displayed, check the connection and repeat the check.
When the error repeatedly occurs, call the customer service.
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