METER IMPULSING INTERPOSING UNIT
Type MIIU4



The Meter Impulsing Interposing Unit (MIIU) has two main functions, one of which is as an isolated meter contact repeater and the other as a barrier between the impulsing output of energy meters and the associated outstations. The MIIU allows customers to run their own meter recording equipment, while safeguarding the integrity and accuracy of the impulse data from the associated electricity meter.

The MIIU4 has one interposing relay, providing 4 normally-open output contacts and is available for use with 48Vdc or 110V dc energisation supplies. A mercury-wetted relay is used to give high life expectancy in excess of 1 x 109 operations. Input circuits and each output circuit are isolated from earth and from each other to a level of 2KV rms at 50Hz.

The input to the MIIU, from a volt-free contact of an energy meter, and the volt-free output contacts are made via a terminal block. The MIIU case incorporates integral mounting feet allowing the unit to be mounted on a VERTICAL (MIIU4V) or HORIZONTAL (MIIU4H) 'G' or 'top hat' DIN rail.

Compatible with Specification NGC-EM42(1990).


SPECIFICATION


RELAY                     1 off 4PNO (form A) mercury-wetted relay.
Energisation voltages:
        MIIU4*/48        43 to 60Vdc (nominal 48V).
        MIIU4*/110       87.5 to 137.5Vdc (nominal 110V).
Burden at 50% duty cycle:
        MIIU4*/48         0.9W at 60Vdc (nominal 0.6W)
        MIIU4*/110       0.5W at 137.5Vdc (nominal 0.3W)
        * H or V (horizontal or vertical)
Output Load:           Source impedance of 1.25K ohms in series with
                               10 micro Henries at 48Vdc.
Life:                         At least 1 x 109  operations  when switching above load.
Note:                      A 27R current limiting resistor is connected in series with
                              the relay output contacts.
Wetting current for
the energising relay: 20mA minimum at 43Vdc, 4mA minimum at 87.5Vdc
INSULATION            2KV rms between all input circuits, output circuits and earth.
                              500V rms across normally open relay contacts.
ENVIRONMENT       EES1989 Class B.
ELECTRICAL
INTERFERENCE      EES1980 Class Z.
TERMINALS            2 off screw terminals accepting up to 2.5mm2 cable.
OUTPUT
TERMINALS            8 off screw terminals accepting up to 2.5mm2 cable.
PHYSICAL  DETAILS
MIIU4H/48 or 110
Fixing:                   A foot is provided for mounting on a HORIZONTAL 'G' 
                             or 'top hat' DIN rail.
Dimensions:           W: 45mm  H: 78mm  D: 58mm (inc. foot).
Weight:                 80gms.
MIIU4V/48 or 110
Fixing:                   A  foot  is  provided  for mounting  on a VERTICAL 'G'
                             or 'top hat' DIN rail.
Dimensions:           W: 78mm  H: 45mm  D: 58mm (inc. foot).
Weight:                 80gms.

Please contact CDL should your supply, load requirements, or mounting configuration differ to the above. Different configurations are available to order.


Convex Design Limited

email:sales@convexdesign.co.uk

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