Product Description; Configuration; Principle Of Operation; Functional Principle - WIKA LH-20 Betriebsanleitung

2 Product description

2 Product description
2.1 Configuration
Scope of delivery
The scope of delivery encompasses:
Model LH-20
l
Documentation
l
Operating instructions
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Ex-specific "Safety instructions" (with Ex
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versions)
if necessary, further certificates
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Configuration
Fig. 9: Configuration of the gauge probe model LH-20
1
Transmitter
2
Suspension cable
Type plate
The nameplate contains the most important data
for identification and use of the instrument:
WIKA Operating instructions – Submersible pressure transmitter model LH-20
2
1
1
2
3
4
5
6
Fig. 10: Type plate of model LH-20 (example for version 4 ... 20 mA/
HART)
1
Instrument
2
Measuring range
3
Supply voltage
4
Article number
5
Serial number
6
Product number
7
Wire assignment suspension cable, temperature
8
Protection rating
9
Signal output
10
Deviation
11
Wire assignment suspension cable, level
12
Note to observe the instrument documentation

2.2 Principle of operation

Application area
Model LH-20 is suitable for continuous level
measurement of liquids. Typical applications are
measurements in water/waste water facilities, deep
wells and in the shipbuilding industry.

Functional principle

The actual sensor element is a measuring cell with
rugged ceramic diaphragm. The hydrostatic pres-
sure causes a capacitance change in the measur-
ing cell via the ceramic diaphragm. This change is
converted into an appropriate output signal.
Voltage supply
4 ... 20 mA two-wire electronics for voltage supply
and measured value transmission on the same
cable.
The data for power supply are specified in chapter
"Technical data".

2.3 Operation

The instrument can be adjusted with the following
adjustment media:
12
11
10
9
8
7
19