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Eltek Wired Data Loggers

Eltek 1000 Series Squirrel data loggers provide a flexible combination of channels, ranges, memory sizes and extra options. If there is not already a model which fits a particular application, then Eltek can almost certainly make one. Information about the Telemetry data loggers can be found here.


The Squirrel data logger is a versatile device designed to collect and log data from various sensors. Here's a breakdown of its basic components:

  1. Main Board:

    • Power Connector: Used to connect the data logger to a power source.

    • Display: Provides a user interface for monitoring and configuring the data logger.

    • RS232 Serial Connection: Allows communication with other devices using the RS232 protocol.

    • Pulse Input: A port designed to receive pulse signals, commonly used for counting events or measuring flow rates.

    • 8-bit Digital Signal Input/Output Connector: This connector is likely used for handling digital signals, which can represent binary data (0s and 1s).

  2. Battery Pack:

    • Provides power to the data logger, ensuring its functionality in locations without a direct power source.

  3. Additional Input Modules:

    • Up to eight additional input modules can be connected to the main board during manufacturing, depending on the specific sensor input requirements. These modules are likely designed to accommodate a variety of sensors, extending the data logger's capability to collect different types of data.

The modular design of the Squirrel data logger, with the ability to connect multiple input modules, makes it adaptable to a wide range of applications and sensor types. Users can customize their data logger based on the specific data they need to collect and monitor.

Eltek Squirrel SQ1063

1063 Model
(24 Voltage/Current + 24 Thermocouple)

Eltek Squirrel SQ1067

1067 Model
(48 Voltage/Current)

Eltek 96 channel data logger image

99 Channel model
(48 Voltage/Current + 48 PT100)


  • Battery or mains operated and easily portable

  • Configuration and Metering by:

    • Panel Controls and display

    • Locally connected PC using Darca Software

    • Remotely connected PC (using Darca Software) via GSM, landline or radio modem

  • Measure up to 250 analogue or digital channels, such as temperature, humidity, pressure, voltage, resistance, current or any other suitable sensor output

  • Non volatile internal memory providing up to 2 million readings of secure data

  • Readings can be scaled into appropriate units (e.g. m/sec, p.p.m.)

  • Low power consumption for long term unattended use or portable operation

  • Customised firmware for specialised requirements

  • LAN Network adaptor for Ethernet connection

  • Highly accurate: ±(0.1% of reading, +0.2% of range span)

  • 12 bit resolution

  • Sensor power outputs

  • 1 pulse count channel and 8 event/digital channels in addition to other inputs

  • External triggers can start and stop the logger

  • Rapid memory download at 38400 baud

  • Up to 99 logging "runs" may be stored

  • 3 year guarantee

Squirrel Modules


Each Squirrel Datalogger typically contains one CPU module and at least one input module. The CPU module contains two inputs of its own; one event input and one pulse input. Up to 8 input modules can be combined into one Squirrel Datalogger, for a maximum total of 250 input channels.

Which modules are available?

  • U Thermistor Type U

  • K/T Thermocouple type K or T

  • P Platinum Resistance PT100

  • V/C Voltage or Current

  • AC AC Voltage or Current

  • pH pH

  • Co Conductivity

  • B Pulse Count

  • F Frequency

  • D Event / Digital




(No additional height added)

Note: the CPU is provided with 1 x B input as standard
One only of the following modules can be added to the CPU.

MXP - Adds 1 additional B input (100 Hz Maximum)
MF2 - Adds 2 additional F inputs (standard 1 x B input forfeited)
MF3 - Adds 3 additional F inputs (standard 1 x B input forfeited)




The Squirrel data loggers enables cost effective direct connection to a range of sensor types including temperature, humidity, and pH with options for pulse, frequency and digital inputs. Any transmitter with voltage or 4-20 mA output can be scaled with engineering units to measure pressures, air quality, CO2 using universal inputs.


Extra Memory

Extra memory is available for the Squirrel in the following sizes:

  • 520,000 Readings

  • 1,040,000 Readings

  • 2,080,000 Readings

One module only may be fitted to a Squirrel. Eltek loggers now download at 38400 baud, and in practice this is about 1000 readings per second.

Faster Logging


The Squirrel normally has a minimum logging interval of one second and can record up to 10 analogue channels per second. For faster logging, special Squirrels are available which can measure up to 8 channels with a minimum logging interval of 0.1sec. This option is currently not available on all loggers but is being constantly updated.

SMS Alarm nofitication


TAn external 4G modem/router can be added to the 1000 Series Squirrels which will send a text message to up to 10 telephone numbers. Contact us for more details.

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