Hach-Lange SI794 P User Manual - Manual (Page 76)

76
Product calibration
Calibration by sampling
During product calibration the electrode remains in the process.
The measurement process is only interrupted briefly.
Procedure: During sampling the currently measured value is saved
in the transmitter. The transmitter immediately returns to measuring
mode.
The calibration mode indicator blinks and reminds you that calibra-
tion has not been terminated.
The sample is measured in the lab or directly on the site using a
portable meter. To ensure an exact calibration, the sample tempera-
ture should correspond to the measured process temperature.
The measured sample value is then entered in the transmitter.
From the difference between the saved measured value and entered
sample value, the transmitter calculates the new offset (one-point
calibration).
If the sample is invalid, you can take over the value saved during
sampling. In that case the old calibration values are saved.
Afterwards, you can start a new product calibration.
Display Action Remark
Product calibration step 1:
Press cal, enter code: 1105
(Presskey to select position,
enter number usingkey,
press enter to confirm)
Take sample and save value.
Press enter to proceed.
If an invalid code
is entered, the
transmitter returns
to measuring mode.
Now the sample
can be measured in
the lab.