Heinrichs Messtechnik GmbH
Page 24 of 118
OPERATING MANUAL TMU-W / UMC4
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 UMC4 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
Standard UMC4 housing, IP 68 / 1 m for 24 hours (NEMA 6P)
Explosion-proof single compartment electronics enclosure (Ex-db)
Terminals: The process terminals are situated at the back-end of the single compartment Ex-d enclosure.
Caution:
Ingress protection IP 68 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 only be guaranteed 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!
