HC16 Receiver / Logger

The Eltek HC16 receiver/logger performs both data logging and heater control. You can specify the ideal temperature for each room, depending on its function, at the time of day and the day of the week. You may adjust the temperature or the relative humidity in a particular room without any reference to any third party.

The built-in battery means data logging is not interrupted even if there is a temporary AC mains failure. Multiple HC16s can be used for wide area coverage.


  • Three basic modes of operation:
    • Temperature control only
    • Conservation mode (using heating to control humidity, where humidity is part of the control loop)
    • Comfort mode (temperature control respecting conservation requirements and visitor comfort)
  • Individual night and day programs
  • SMS text and email alarm messages to key personnel to prevent problem escalation
  • 24 hour built-in standby battery
  • 247K readings expandable to 2M readings
  • Transmitter battery alarm
  • Extensive communications options




GSM Modem kit (logger / receiver side)

The kit consists of the following:

  • Wavecom Xtend modem
  • Mounting tabs
  • Logger to modem lead (type GSM-mdm-com2X)
  • Antenna with 1.8m lead
  • SMA connector
  • User instructions

When installed, access to the Squirrel can be achieved via a GSM network.
Note: GSM connectivity is not available with Darca Lite software.
A SIM card from the Network Service Provider is required.
The kit is necessary for text messaging functionality.




GSM Modem kit (PC side)

The kit consists of the following:

  • Wavecom Xtend modem
  • Antenna
  • Modem to PC serial lead (type LC-PC/MDM)
  • AC to 12V DC power supply (type MPGSMextend)
  • User instructions





RS232 to RS485 interface converter

This unit converts the standard RC250 or Squirrel RS232 interface to a RS485 interface; thereby allowing equipment with the RS485 interface to communicate with the receiver/logger.

  • Allows much longer cable lengths than RS232 - RC250/Squirrel can be further away from the PC or other connected equipment
  • All RC250 units (after serial number T-25194) are compatible with this device

If you require a new logger to work with this interface, please specify at the time of ordering. Existing loggers may need a firmware update to work with the RS485 interface - please contact Eltek for advice.

Squirrels using this interface must be mains powered.





UHFflexi/SMA standard quarter wave whip

LW-ANT/SMA lightweight indoor or external dipole antenna

Yagi directional antenna

The UHF flexi/SMA standard quarter wave whip antenna and LW-ANT/SMA antenna have a similar performance profile; but the LW-ANT/SMA can be used when the logger is required to be placed inside a screened cabinet, or better reception can be achieved by placing the antenna in a particular location where it would not be practical to locate a logger. Yagi directional antennae are useful in outdoors applications for achieving a longer distance between the transmitter and receiver. Please note that in the UK, these antennae should only be used with a logger or receiver; please check your local regulations if you are outside the UK.


Number of channels: Up to 250
Number of transmitters: Up to 125
Ambient temperature: -10 to +55°C
Humidity: Up to 95% (non condensing)
Power supply: 12V DC at 500mA powered using type MP12U, (input 100-250V AC)
Built-in batteries: 6 x AA Ni Mh battery
Backup battery life: Typically 24 hours
Memory: 247,000 readings expandable to 2,000,000
Clock accuracy: 1 second/day at 20°C
Dimensions: D 60mm x W 180mm x H 120mm
Weight: 1Kg inc. batteries
Case material: Scratch resistant Nextel coated ABS
PC/modem interface: RS232C up to 38.4K Baud
Receiver: Crystal controlled
Sensitivity: UHF: -117dBm
Antenna connector: SMA 50 ohm female
Antenna: Quarter wave standard, lightweight dipole optional
Communication options: USB, GSM and Ethernet
Alarm: RX250AL: SMS + 1 contact closure, RX250ALD: SMS + 2 contact closures


Product datasheet:

HC16 system datasheet