Endress+Hauser Smartec S CLD132 - Instrument check by medium simulation

Smartec S CLD132 Maintenance
Endress+Hauser 57
7.2.3 Instrument check by medium simulation
The inductive sensor cannot be simulated.
However, the overall system comprising the CLD132 and inductive sensor can be checked using
equivalent resistances. Note the cell constant ( k
nominal
= 5.9 for CLS52).
For an accurate simulation, the actual cell constant (can be read in field C124) is to be used to
calculate the display value:
Display conductivity
[mS/cm]
= k ⋅1/R
[kΩ]
. Values for simulation with CLS52 at 25 °C / 77 °F:
Conductivity simulation:
Pull a cable through the sensor opening and then connect, e.g. to a decade resistor.
Temperature sensor simulation:
The temperature sensor of the inductive sensor is connected to terminals 11, 12 and 13 on the
instrument (compact version and separate version).
For simulation, the temperature sensor is disconnected, and an equivalent resistance is connected
instead. This resistance must also be connected using a three-wire arrangement, i.e. connection to
terminals 11 and 12, with a bridge from 12 to 13.
The table shows some resistance values for temperature simulation:
Simulation resistance R Default cell constant k Conductivity display
5.9
Ω 5.90 cm
-1
1000 mS/cm
10
Ω 5.90 cm
-1
590 mS/cm
29.5
Ω 5.90 cm
-1
200 mS/cm
100
Ω 5.90 cm
-1
59 mS/cm
295
Ω 5.90 cm
-1
20 mS/cm
2.95 k
Ω 5.90 cm
-1
2 mS/cm
29.5 k
Ω 5.90 cm
-1
200 µS/cm
Temperature Resistance
- 20 °C 92.13
Ω
-10 °C 96.07 Ω
0 °C 100.00 Ω
10 °C 103.90 Ω
20 °C 107.79 Ω
25 °C 109.73 Ω
50 °C 119.40 Ω
80 °C 130.89 Ω
100 °C 138.50 Ω
150 °C 157.32 Ω
200 °C 175.84 Ω