Hach-Lange SI792 P, SI792x P, SI792x P-FF, SI792x P-PA User Manual - Manual (Page 49)

Operation—Foundation Fieldbus
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6.2.2 Standard analog input block (AI)
Three Analog Input Function Blocks provide for cyclic transmission of
measured values (currently measured value with status, alarm limits,
freely selectable process parameter).
6.2.2.1 Operating modes
Use the MODE_BLK parameter to set the following operating modes:
• OOS—out of service. If not write-protected, access to all
parameters is allowed.
• MAN—manual
• Auto—online, normal state
6.2.2.2 Set the parameter and units
Use CHANNEL to set the measured parameter and units ( Table 12 ).
The corresponding measurement unit is selected in the UNITS
subparameter of XD_SCALE (
Table 13 on page 49 ).
Table 12 Measurement parameters and units
Channel Parameter Unit
1 pH pH
2 ORP mV
3 Temperature
°C
°F
4 Glass impedance M
Ω
5 Ref. impedance k
Ω
6 Slope %
7 Asymmetry potential mV