Conductive Calibration - Endress+Hauser Mycom CLM 152 Operating Instructions Manual

Calibration
62
9.3

Conductive calibration

CAL
9.3.1 Numerical calibration by entering the cell constants
The cell constant is measured precisely at the
factory and is entered directly in cm
differential measurements, enter the cell
constant separately for each sensor.
9.3.2 Wet calibration for determining the recent cell constants
The conductivity of a calibration (at precisely
known conductivity) is measured
(for calibration solutions, see Chapter 3.7.2).
The display is set to the conductivity of the
calibration solution and the instrument
then calculates the cell constant.
Proceed as follows:
• For differential measurements:
Select the sensor for calibration
• Clean the sensor
• Place the sensor and, if necessary, the
temperature sensor in the calibration
solution
• Start the calibration by pressing »E«
• Display measured value of calibration
solution, ATC/MTC, Temp, Tc of
calibration solution
• Wait until the measured value stabilises
• Accept the measured value by pressing
»E«
• Set the setpoint
Set the precise value of the calibration
solution by using the arrow keys, input
range:
k = 0.01 0 – 200.0 µS/cm
k = 0.1 0 – 2000 µS/cm
k = 1 0 – 20.00 mS/cm
k = 10 0 – 200.0 mS/cm
k = 0.01
20 kΩ cm – 20.00 MΩ cm
k = 0.1
2.00 kΩ cm – 2000 kΩ cm
k = 1 0.200 kΩ cm – 200.0 kΩ cm
• Confirm entry by pressing »E«
• Display calculated cell constant
• End or repeat calibration
→ Enter cell constant
→ Determine cell constant
Cell constant
-1
. For
-1
0.01 cm
-1
0.1 cm
-1
1 cm
-1
10 cm
If you select »End cal.«, the new cell constant
calculated is accepted and the system
switches to Measuring mode.
Note:
To carry out a high-precision
calibration, the temperature
influence of the temperature
difference in relation to the reference
temperature must be eliminated, i.e.
calibration must take place at the
reference temperature. If this is not
possible, you can enter the
calibration temperature or the Tc
value of the calibration solution in
the »Instrument data / Calibration«
menu.
To measure the precise
temperature, the temperature sensor
must be checked and calibrated in
the »Instrument data / Temperature«
menu every time before the
conductivity measurement is
calibrated.
Warning:
When the Chemoclean function is
activated, the automatic cleaning
function is disabled automatically
with the start of calibration. It is
re-enabled at the end of the
calibration function.
Mycom CLM 152
9.3.1
9.3.2
Input range
-1
0.0005 ... 0.0500 cm
-1
0.050 ... 0.500 cm
-1
0.500 ... 5.000 cm
-1
5.00 ... 99.99 cm
Endress+Hauser