JUMO 202550 Operating Instructions Manual page 58

18 Conductivity indicator
Procedure
18.8.2 Automatic determination of the temperature coefficient, using
automatic temperature entry
You will need
Initial condition
56
"Operating modes and states", page 24.
Unlock the instrument for calibration,
"Unlocking the levels", page 27, (code word 0110)
Immerse the sensitive portions of the cell and the thermometer in the
solution to be measured.
Temper the solution to 25°C.
Press the and
PGM
The upper display shows the uncompensated conductivity value for
the measured solution at 25°C, alternating with "CAL1"; the lower display
shows the temperature that was set manually.
Use the and
Press the key.
PGM
The upper display shows the uncompensated conductivity value for
the measured solution at the present temperature, alternating with "CAL2".
Temper the solution to the future working temperature.
Use the and
Press the key.
PGM
The upper display shows the conductivity value (compensated for 25°C) for
the measurement solution at the present temperature. The lower display
shows the temperature that was set before the start of calibration.
The instrument uses the non-temperature compensated measurements (TC =
0) at two different temperatures (the reference temperature of 25°C and a
second temperature, usually that which will be used for later measurements) to
determine the temperature coefficient of the solution being measured.
- A sample of the medium to be measured
- A tempering setup
- A Pt100 or Pt1000 temperature probe (not necessary if the conductivity cell
is equipped with an integrated temperature sensor).
The conductivity transmitter is attached to the JUMO dTRANS Az 01, as well
as a Pt100 or Pt1000 temperature probe (if required),
"Electrical connection", page 18ff.
The temperature acquisition is configured as "Automatic temperature
compensation",
Chapter 21.2 "Analog inputs - C111", page 61.
The calibration procedure has been configured to "Determination of the
temperature coefficient, process value output ..." – frozen or not frozen,
Chapter 26.4 "Controller options - C211", page 76.
(CAL) keys.
keys to set 25.0 (°C).
keys to set the future working temperature (°C).