Transmitters with inputs for thermistor temperature sensors

00 Series

GC04 / GD04

1 thermistor input with measurement range -40 to +70°C. 'D' Indicates LCD display.



30 Series

GS and GD31 / 2 / 4 / 8

Thermistor input with measurement range -50 to +150°C. 'D' Indicates LCD display. Last digit indicates number of inputs.

GD32AL / 34AL / 32ALS with visual alarm

With visual alarm. High and low alarm levels, together with alarm delay time, can be set using Eltek Darca Software. 'S' indicates visual and audible alarm.

GDM32 / GDM42 with backup memory

The GenII M series retains the standard GenII transmitter specification and adds 12,000 readings of built-in backup memory. The memory is used in continuous overwrite mode. This means many weeks of data can be held in the transmitter, depending on the number of channels in use.




Connectors are included. 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 *
GC04/GD04 1 x external thermistor -40 to +70°C 0.1°C ±0.2°C (-15 to +40°C)
0.2°C ±0.4°C (-29 to +65°C)
0.3°C ±0.6°C (-36 to +70°C)
0.4°C ±0.8°C (-40 to -36°C)
GS31/GD31 1 x external thermistor -50 to 150°C 0.05°C (-5 to +75°C) ±0.1°C (-5 to +75°C)
0.1°C (-25 to +100°C) ±0.2°C (-25 to +100°C)
0.2°C (-40 to +125°C) ±0.4°C (-40 to +125°C)
GS32/GD32 2 x external thermistor As GS31
GS34/GD34 4 x external thermistor / state inputs As GS31
GS38/GD38 8 x external thermistor / state inputs As GS31
GD32AL/GD34AL As GD32 and GD34
with audible and visual alert
* Please note that the accuracy specifiation quoted does not include the accuracy of the probe that is chosen for use.


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)
GenII M Series transmitters with backup memory