Operating Manual PIT-UMF2 (B)
Heinrichs Messtechnik GmbH
Page 7 of 14
5.1.2
Removal and installation under process pressure
For easy removal and installation under pressure, a special retraction device is available. When using
this device, the sensor head must not be damaged by closing the valve.
For details, see the Additional Operating Instructions for Removal and Installation the meter under
process pressure Additional Operating Instructions PIT-Druck_BA_0X_eng.doc (see also Section 14
"Options").
5.1.3
Grounding
For safety reasons and to ensure faultless operation of the magnetic-inductive flow meter, earthing of
the flow sensor is important. In accordance with VDE 0100, Part 540, the earthing connections must
be connected to the grounding conductor. To avoid false measurement, the ground potential must be
identical to the ground potential of the medium.
When using insulated and lined pipes or plastic pipes, the metrological grounding of the medium for
PIT-S (SS) is carried out via the wetted part of the sensor head.
All wetted parts of PIT-A (PFA) are coated with PFA. Therefore it is not possible to ground the medium
via the housing parts. In this case make sure that the PIT-A sensor will be supplied an earthing. If the
sensor does not have an earthing electrode ensure that a suitable earthing disc will be used.
5.2
Use in hazardous areas
The flow meters PIT-
…/UMF2 (B) are not intended for use in hazardous areas.
5.3
Ambient conditions
5.3.1
Ambient temperature ranges
-20°C to +60°C, below 0°C the readability of the LCD is limited
5.3.2
Storage temperature
-25°C to +60°C
5.3.3
Climatic category
In accordance with IEC 654-1
Not weather-protected
Class D locations
exposed directly to open-air climate
5.3.4
Ingress Protection
PIT standard sensor: IP65, option: IP68
UMF2 (B) standard housing IP68 (NEMA 6P)
Caution:
Ingress protection IP68 is only achieved if suitable and tightly screwed down cable
glands or conduits are used. If the cable glands are only tightened manually water may
leak into the terminal compartment in the housing.
Danger:
Particular care must be taken if the window in the housing becomes fogged over or
discolored because moisture, water or product might seep through the wire sheath into
the terminal compartment in the housing!
Warning:
Electromagnetic compatibility is only achieved if the electronics housing is closed.
Leaving the enclosure open can lead to electromagnetic disturbances.
5.3.5
Shock resistance/vibration resistance
The meter should be protected from extreme shocks and vibrations, which could cause damage.
