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Heinrichs Messtechnik GmbH
OPERATING MANUAL TMU / UMC3
Page 35 of 122
Environmental conditions
Ambient temperature
− 20 °C to + 60 °C (-4 °F to 140 °F), below 0 °C (32 °F) readability of the LC display may diminish.
Storage temperature
−25 °C to + 60 °C (-13 °F to 140 °F)
Climatic category
In conformity with IEC 654-1. Unsheltered class D locations with direct open-air climate.
Vibration immunity
The UMC3 is insensitive to moderate vibration; vibration stability has been validated in accordance with
DIN IEC 68-2-6, for up to 1 g at 10 to 150 Hz.
Ingress protection and separation
Standard UMC3 enclosure, IP 65 (NEMA 5)
Selectable Explosion-proof an Ex-db one- or a two-compartment enclosure, Ex-db and Ex-eb
Terminals: The process terminals are situated at the back-end of the enclosure., behind the BE-2 control
unit.
Caution:
Ingress protection IP 65 can only be guaranteed if suitable and sufficiently tightened
cable glands or conduits are used. If the cable glands are not tightened sufficiently,
water may leak into the terminal compartment of the enclosure and cause damage to
the electronics.
Caution:
Particular care must be taken if the enclosures viewing window becomes fogged or
discoloured, which may be an indication of moisture, water or product seeping through
the wire sheath into the transmitter’s housing.
Caution:
Electromagnetic compatibility can be guaranteed only if the lids of the enclosure are
securely tightened. Leaving the enclosure open may lead to electromagnetic
disturbances.
Warning
In Ex hazardous areas, only sensors and transmitters marked as such on their rating
plates may be used!