Endress+Hauser Smartec S CLD134 - Instrument Check by Medium Simulation

Maintenance Smartec S CLD134
62 Endress+Hauser
7.2.3 Instrument check by medium simulation
The inductive sensor cannot be simulated.
However, the overall system comprising the CLD134 and inductive sensor can be checked using
equivalent resistances. Note the cell constant ( k
nominal
= 6.3 cm
-1
for CLS54).
For an accurate simulation, the actual cell constant (can be read in field C124) is to be used to
calculate the display value:
Conductivity
[mS/cm]
= k ⋅1/(R
[kΩ]
⋅ 1.21). Values for simulation with CLS54 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
10
Ω 6.3 cm
-1
520 mS/cm
26
Ω 6.3 cm
-1
200 mS/cm
100
Ω 6.3 cm
-1
52 mS/cm
260
Ω 6.3 cm
-1
20 mS/cm
2.6 k
Ω 6.3 cm
-1
2 mS/cm
26 k
Ω 6.3 cm
-1
200 μS/cm
52 k
Ω 6.3 cm
-1
100 μS/cm
Temperature Resistance
- 20 °C (-4 °F) 921.3
Ω
-10 °C (14 °F) 960.7 Ω
0 °C (32 °F) 1000.0 Ω
10 °C (50 °F) 1039.0 Ω
20 °C (68 °F) 1077.9 Ω
25 °C (77 °F) 1097.3 Ω
50 °C (122 °F) 1194.0 Ω
80 °C (176 °F) 1308.9 Ω
100 °C (212 °F) 1385.0 Ω
150 °C (302 °F) 1573.2 Ω
200 °C (392 °F) 1758.4 Ω