ABB AX400 Series User Manual page 34

Single and dual input analyzers for pH/Redox (ORP)
AX416, AX436, AX460, AX466 & AX468
Yes
-----
No
A: Sample Comp.
No
Yes
-0. 0 35
pH/°C
A: Sample Coeff.
60. 0
%
A: Set Min Slope
Config. Sensor A
32
Solution Temperature Compensation
Select to enable compensation for solution temperature effects referenced to
Yes
25 ºC.
Sample Coefficient
If
Sample Comp.
within the range 0.020 to –0.050 (in –0.001 increments). For ammonia and sodium
hydroxide dosed boilers the value is typically –0.035 (this depends on the individual
boiler chemistry). The exact value for a particular sample needs to be determined by
laboratory analysis.
pH Calibration Minimum Slope Value
Set the required pH calibration minimum slope value, in %, within the range 60.0 to
90.0 (in 0.1 increments). The calibration fail limit is set automatically to 20 % below the
minimum slope setting – see Table 4.1.
Sensor B (dual input analyzers only) configuration is identical to Sensor A
Config. Sensor B
configuration.
see Section 5.4, page 33
CONFIG. DIAGS
is set to , enter the temperature coefficient of the sample, in pH/ºC,
Yes
5 Programming
IM/AX4PH Rev. P