Transmitters for monitoring digital state

20 and 30 Series

GS and GD24

4 state inputs (or K/T thermocouples -200 to +200°C), e.g. door open/close.

GS and GD34 / 8

4 / 8 state inputs (or thermistor), e.g. door open/close.



60 Series


2 state inputs, e.g. door open/close.


2 count inputs to monitor the opening and closing of one or two contacts (e.g. a door or window magnet activated contact).
4 x calculated channels providing additional data about the relationship between the states of the two doors/windows.




If you require sensors, please order them separately.


WBG Wall bracket docking kit

This kit enables fitment of the transmitter's built-in wall bracket to difficult or uneven surfaces. The kit provides additional docking security.

The following products are supported:

  • All GD, GC, GL and GS series transmitters
  • RP250GD repeater and RC250 receiver


Common GenII Transmitter Specification

RF specification: EN300-220
RF power: 10mW
Environment specification  
  Compliant to EN300-220: -10 to +55°C
  Actual: -30 to +65°C
  Humidity: 100% non condensing
Environmental rating: IP40
Dimensions (footprint): 78 x 41mm
Transmission interval range: 1 sec to 4 hours
Indicator (red LED): transmit active/on/off
Control switch (concealed): test mode / hibernate
Antenna socket: SMA

Transmitter Specification

Model(s) Sensors Range Resolution Accuracy
GS24/GD24 4 x external T or K type thermocouple temperature / state inputs -200 to 200°C 0.1°C / 0.2°C ±0.3°C
4 x external thermistor temperature / state inputs
8 x external thermistor temperature / state inputs
-50 to 150°C 0.05°C (-5 to +75°C)
0.1°C (-25 to +100°C)
0.2°C (-40 to +125°C)
±0.1°C (-5 to +75°C)
±0.2°C (-25 to +100°C)
±0.4°C (-40 to +125°C)
GC60 2 x state indications
GC60Y 2 x physical inputs indicating the number of open and close events of the door contact.
2 x one second counters to provide the accumulative total of how long the door contacts on the physical inputs were open.
1 x count (accumulated) of the number of times both doors are open together.
1 x one second counter for previous channel showing accumulative total of how long both doors were open together (shown in seconds).


Common to all transmitters

Gen II Quick Start Instructions

Specific to this family of transmitters


ELCC (a sensor for detecting the failure of AC mains supply)

User Instructions:

User Instructions For GC60Y
User Instructions For GC60