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The Context Plus XP95 Switch Monitor (Part Number 55000-843IMC) is designed to monitor single pole, volt-free contacts and report their status to compatible control equipment, providing four input states: 'Normal', 'Fault', 'Pre-alarm', and 'Alarm'. It features a bi-directional short-circuit isolator, operates at 17–28V DC, and includes visible LEDs for status indication. Additionally, the Mini-Switch Monitor (Part Number 55000-760) offers a compact design for space-limited areas, suitable for DIN-Rail or enclosure mounting, and also monitors the state of contacts with status LEDs.

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28 views1 page

Module

The Context Plus XP95 Switch Monitor (Part Number 55000-843IMC) is designed to monitor single pole, volt-free contacts and report their status to compatible control equipment, providing four input states: 'Normal', 'Fault', 'Pre-alarm', and 'Alarm'. It features a bi-directional short-circuit isolator, operates at 17–28V DC, and includes visible LEDs for status indication. Additionally, the Mini-Switch Monitor (Part Number 55000-760) offers a compact design for space-limited areas, suitable for DIN-Rail or enclosure mounting, and also monitors the state of contacts with status LEDs.

Uploaded by

rajjai1954
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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5005 ContextPlus Brochure 270411_Context plus final singles 10/05/2011 08:53 Page 28

SWITCH MONITORS

Switch Monitor with Isolator, 55000-843IMC


The Context Plus XP95 Switch Monitor is designed to
VdS
monitor the state of one or more single pole, volt-free 010ah 0832 G201033
contacts connected on a single pair of cables and to report
the status to Context Plus compatible control equipment.
FEATURES
The Switch Monitor provides four input states to the control equipment: ‘Normal’, ‘Fault’,
‘Pre-alarm’ and ‘Alarm’. The Switch Monitor has a red LED to indicate an alarm and two
yellow LEDs to indicate a switch input wiring fault or a loop short-circuit wiring fault.
The Switch Monitor is fitted with a bi-directional short-circuit isolator and will be
Part Number 55000-843IMC
unaffected by a single short-circuit on either loop input or output.
ELECTRICAL CONSIDERATIONS
The Switch Monitor is loop powered and operates at 17–28V DC with protocol voltage
pulses of 5–9V. It is designed to accept a maximum line resistance of 50Ω. The end-of-
line resistor required is 20kΩ.
MECHANICAL CONSTRUCTION
The Switch Monitor is supplied with a back box for surface mounting and is intended for
indoor use only.
Three LEDs, one red and two yellow, are visible through the front cover of the enclosure.
The red LED can be illuminated under CIE control in the event of an alarm being detected.
One yellow LED is illuminated in the event of a fault condition being detected in the
monitoring circuit and cannot be controlled by the CIE.
The other LED is illuminated whenever the built-in isolator has sensed a short-circuit
loop fault.
Part Number 55000-760

Technical Data
Minimum loop operating voltage in normal Switch input monitoring voltage: 9–11V DC
conditions: 17V DC Maximum cable resistance: 50Ω
Maximum loop operating voltage: 28V DC Operating temperature: –20°C to +70°C
Maximum current consumption at 24V: Humidity (no condensation): 0–95%RH
Switch-on surge, max 150ms: 3.5mA Shock, vibration and impact: to GEI 1-052
Quiescent, 20kΩ EOL fitted: 1.25mA IP rating: 54
LED off, switch input closed: 1.5mA Radiated and conducted RF emissions to:
LED on, switch input closed: 3.5mA BS EN50081-1 & 2
LED on, switch input s/c: 3.6mA Radiated and conducted RF immunity to:
BS EN50130-4
Maximum continuous current: 1A Dimensions of switch Monitor (surface mount):
Maximum switching current: 3A 150 x 90 x 48mm
On resistance: 0.2Ω Weight: 240g

Mini-Switch Monitor with isolator, 55000-760


Our new Context Plus Mini Switch Monitor is an VdS
interface within an entirely new housing which is ideal
010ah 0832 G201034
for use in areas where space is limited. Its compact
design allows the unit to be fitted onto a standard 35mm DIN-Rail (using a twist-click
motion) or to be mounted within an enclosure, for example a manual call point. It is
designed to monitor the state of one or more single pole, volt-free contacts connected
on a single pair of cables and to report the status to Context Plus compatible
addressable control equipment. The unit includes three coloured status LEDs.

28

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