Hach-Lange SI792 C Quick start guide - Manual (Page 2)

Calibration by comparison/grab sample
The sensor can be calibrated by measuring the process water with a portable instrument or
taking a grab sample and measuring the value in the lab (one-point calibration). The sensor
does not need to be removed from the process during calibration. The sample temperature
should correspond to the measured process temperature for accurate results.
Note: The calibration by comparison option is not available when the range and units are set
to 00.00%.
1. Press CAL , enter passcode: 1105, ENTER . The display will show CAL PRD and then StorE.
2. Measure the process water with a portable instrument or collect a grab sample for mea-
surement in the lab. Press ENTER to proceed.
The cal mode indicator will flash to indicate that calibration has not been completed. The
transmitter will continue to measure and display the current sample values.
3. Measure the grab sample with a laboratory or portable meter.
4. Press
CAL , enter passcode: 1105, ENTER to access the product calibration once more.
The display will briefly show CAL PRD and then CALC.
5. Edit the displayed value to match the value measured by the laboratory or portable meter
and press ENTER . The display will show the new cell constant.
Press ENTER to end the calibration. The display will alternate between the measured value
and Hold. Press ENTER to return to the measuring mode. The outputs will remain in the hold
mode for approximately 20 seconds.
Note: For comparison calibration via Foundation Fieldbus, see the user manual.
Table 1 Default passcode settings
Display Function Default setting
Cal INFO Calibration information 0000
CAL CELL Calibration mode for si792x C-PA 1100
CAL SOL Calibration with standard solution 0110 1
CAL PROD Product calibration 1105 1
CAL RTD Temperature sensor adjustment 1015
CFG ERR Error information 0000
CFG CONF Configuration mode 1200
CFG SNSR MO Sensor monitor 2222
CFG OUT Current source 5555
CFG SPCL ST
Administrator passcode. Use ARROW keys to
select NO or YES
1989
NO SPCL ST
Do not change
administrator
passcode Press ENTER to return to the default
Press CONF to exit the editor
YES SPCL ST
Change administrator
passcode
Press ENTER to accept the new
Press CONF to exit the editor
1 Not available with si792x C-PA