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5.3 Settings for PH402G and PH202G(S)
Function
Setting
(default)
code 01
code 02
code 03
code 04
code 31
jumper input 1
jumper input 2
5.4 Settings for PH150, PH450G and FLXA
Function
Setting
(default)
sensor setup
measurement
setup
Impedance
setting
input1
input 2
jumper input 1
jumper input 2
6. GENERAL CALIBRATION & MAINTENANCE PROCEDURE
6.1 Calibration for pH measurement
To calibrate the FU20 pH/ORP sensor, two buffer solutions with known pH values
are required. It is recommended that one buffer solution has a value near to pH 7.00.
Depending on the process value to be measured, the second buffer solution should be
either acidic (below pH 7.00) or alkaline (above pH 7.00). Normally the IEC buffers (pH 4.01,
6.87 and 9.18) are used.
The following is a very general 2-point calibration procedure:
1. Clean the sensor using a 5% solution of HCl;
2. Rinse sensor thoroughly with demineralized water;
3. Immerse the sensor in the first buffer (pH 6.87 is recommended) and
execute calibration as described in the Instruction Manual of the analyzer.
4. Rinse sensor thoroughly with demineralized water;
5. Immerse the sensor in the second buffer (pH 4.01 or 9.18 is recommended)
and execute calibration as described in the Instruction Manual of the analyzer.
6. Rinse sensor thoroughly with demineralized water.
During calibration, the temperature compensation should be active.
The EXA/FLXA analyzer automatically compensates for the sensitivity change of the
pH sensor at different temperatures.
After calibration, replace or re-install the sensor into the process.
pH
pH&ORP
0(pH)
0(pH)
0(off)
1(ORP)
1.1.1
1.1.1
0.0.1
0.0.1
0
2
no
no
yes
yes
pH
pH&ORP
pH
pH+ORP
pH+ORP
High
High
Low
Low
no
no
yes
yes
pH&rH
ORP
0(pH)
1(ORP)
2(rH)
0(off)
1.1.1
0.0.1
0.0.1
0.0.1
2
no
yes
yes
yes
pH&rH
ORP
pH+ORP
ORP
pH+rH
High
Low
Low
Low
no
yes
yes
yes
15
pH compensated
ORP
1(ORP)
0(off)
0.0.1
1.1.1
yes
no
pH compensated
ORP
ORP
Low
High
yes
no
IM 12B06J03-02E-E
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