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Without the sensor, the operation of the amplifier can be checked by using the following
circuit diagram:
NAMUR
amplifier
With the potentiometer the current through the NAMUR amplifier can be modified. The
switching point must be between 1.2 mA and 2.1 mA. That is, with the current below 1.2
mA the output relay must have a state and above 2.1 mA the output relay must have the
other state.
17.8
TH6 transmitter maintenance
No special maintenance is required.
18
TECHNICAL CHARACTERISTICS
18.1
Series M21
Accuracy:
Scales:
Mounting length:
Scale range:
Fluid density:
Working temperature:
Ambient temperature:
Working pressure:
Connections:
Housing:
According to VDI/VDE 3513 sheet 2 (qG=50%): 4%
Direct in engineering units or in %
160 mm (168 mm in M21-H)
10:1
No restrictions
-80ºC ... +250ºC (without limit switches / transmitters)
-80ºC ... +200ºC (with limit switches / transmitters)
-20ºC ... +80ºC
PN40
without regulation valve
PN16
with regulation valve
M21-R / N Vertical inlet and outlet BSP / NPT
M21-HR / HN Horizontal inlet and outlet BSP / NPT,
without valve
M21-HRA / HNA Horizontal inlet and outlet BSP / NPT +
valve on the inlet
M21-1 / 3 / 7 / 30 Vertical inlet and outlet sanitary
IP65
30
Potentiometer
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