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Transmitters for energy monitoring with self-powered CTs

Sensors are not included and must be ordered separately.
newGD40A The four GD40A sensor inputs are designed for ND Meter SXD self powered CTs. The transmitter is intended for use in situations where an averaged rather than instantaneous value at the time of transmission is required.
  • Ideal for retrofit - just clip round the cable
  • Non invasive energy monitoring
  • Ideal for temporary system
  • Range of compact clip-on CTs: 5 / 10 / 20 / 30 / 50 / 100 or 200A available. Other ranges available P.O.A
  • Use different CT types on each of the transmitter inputs
  • Ideal for comparing values
  • Scrolling display of scaled values with battery condition gauge
  • GD40A provides average current value per transmitter interval
  • Battery or mains powered. The internal battery pack is for short term use only and provides typically 10 weeks operation at a 5 minute tx interval.



CTs for use with the GD40A

SXD5/5 0-5A CT
SXD10/5 0-10A
SXD20/5 0-20A
SXD30/5 0-30A
SXD50/5 0-50A
SXD100/5 0-100A
SXD200/5 0-200A


Common 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
Battery endurance: up to 5 years (interval set to 5 minutes) (less for GL-70 and GS40 series)
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
GD40A 4 x voltage inputs with averaging for NDMeter SXD self powered CTs
At the point of transmission the averaged value of the last 30 values, sampled every 10 seconds per channel, is sent.
0-6VDC only

Common to all transmitters
Gen II Quick Start Instructions

Specific to this family of transmitters
Energy Monitoring With CTs

User Instructions
User Instructions For GD40A