KROHNE H250-MS14 User Manual
11/2012
MA H250-MS14-Ex-II2G-AD-R01-en 4000602001
H250 with mounted limit unit MS14
Operating instruction Electrical equipment for hazardous locations
Category for instrument II2G for use in hazardous locations zone 1
Norm conformity The electrical equipment operates as a simple device. It is in
conformity with intrinsic safety EN 60079-11:2007, para. 5.7
Ex marking None (because it is not required in accordance to 60079-11, para. 5.7)
Reed-contact type Bistable contact with integrated magnet
Temperature range -20...+85°C
Insolation 500 Vac against earth
Electrical data Only for connection to certified intrinsically safe circuits.
Peak values:
Ui = 30 V
Ii = 100 mA
Ci negligible
Li negligible
Electrical connection MS14 - type 1 with 1000mm cable connection, 2-wire
MS14/A - type 2 with connection box, protection IP44
Terminals Terminal 1 and 2
General Follow the specification and the instructions of this operation manual.
Installation, startup When applying this equipment pay attention to directives, standards and
laws. The intrinsic safety is warranted only with appropriate intrinsic safe
equipment.
Prefer a galvanic isolation to avoid ignition hazard which arise from transient
current of equipotential bonding.
Maintenance A modification of the equipment in hazardous locations is not allowed.
11/2012
MA H250-MS14-Ex-II2G-AD-R01-en 4000602001
Electrical connection
For the electrical connection, first unscrew the cover. Because the reed contact is potential-free, the
terminals are not labeled. The intrinsically safe equipment may only be connected to separated intrinsically
safe circuits.
Setting
The MS14 is fixed to the flowmeter with a special support and is adjustable over the full measuring
range.
The limit switch MS14 is a potential-free, bistable reed contact. It can be operated optionally as an
NO or NC contact. Unless specified otherwise, it is supplied by the factory as an NO contact.
Untighten support screw (1).
Set operating point.
Tighten support screw (1).
Contact function
Two contact functions are available for limit monitoring:
Closing, at decreasing flow: Arrow on reed cartridge points away from measuring cone.
Closing, at increasing flow: Arrow on reed cartridge points towards measuring cone.
The contact function can be changed by changing over the reed cartridge screwed into the
cartridge case:
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