Squirrel: 450/850 - Data Logger 4 or 8 universal inputs

Squirrel: 450/850 - Data Logger 4 or 8 universal inputs
Main features
  • Works on battery or mains and easy to carry
  • Configuration and measurement by:
    Controls and display from buttons on the case
    PC connected locally with Darca Software
    PC connected remotely (using Darca Software) via GSM, terrestrial modem or radio
  • Non-volatile internal memory storing up to 2,080,000 secure measurements
  • Data can be scaled in appropriate units (eg m / sec, p.p.m.)
  • Low power consumption for unattended operation or portable operation
  • Firmware customized for specialized needs
  • LAN Network adapter for Ethernet connection
  • Very accurate: ± (0.1% reading, + 0.2% range)
  • Resolution 12 bits
  • Voltage outputs for supplying sensors
  • External triggers can start and stop the recorder
  • Download quick memory to 38400 baud
  • Up to 99 records can be stored

4 or 8 Multi-purpose inputs

The Squirrel 450/850 series is a cost effective portable data logger with a maximum of 4 or 8 inputs. In common with its bigger brother, the Squirrel 1000 series data logger, it is equipped with impressive specifications, long battery life and a three year guarantee. Models 451 and 851 have 4 or 8 universal inputs respectively, configurable for voltage, current and temperature for both thermocouple and thermistor sensors. In addition a serial interface is available for special applications, including Vaisala weather sensors WMT52 & WXT520.

Common Features

All models feature panel mounted controls (except the 401) and a 2 line, 32 character LCD readout for setting up, monitoring and reading recorded events on the logger. Resolution is 12 bit with standard thermistor, thermocouple and DC voltage or current inputs. Two sensor power outputs are available to power external sensors – such as humidity probes.

EU Range
In addition “EU” range is standard, enabling the logger to independently rescale each input to a user defined engineering unit, e.g. humidity can be displayed as 0 to 100% RH, permitting quick and unambiguous understanding of the readings on the display.

Internal memory
The logger is fitted as standard with 250K of memory, backed up by a lithium battery, and at least 250,000 locations are available for data storage. Note that this refers to data storage, not bytes, as 2 bytes of conventional memory are used for every reading. Larger memory can be field fitted by a competent engineer as an option

The 450/850 Series Range Of Models

The current 450/850 series consists of the following models, each offers a wide variety of user applications:

Model Inputs Features
451
851		 4 channels
8 channels		 Each channel configurable for temperature, voltage or current input
451L
851L		 4 channels
8 channels		 Each channel configurable for temperature (thermistor) or +/- 10mv (huxserflux heat flux sensor)
451T
851T		 4 channels
8 channels		 0.1sec interval (fast recording feature)
451pH 4 channels Supports up to 2 x external pH adaptor module type pH-int (purchase separately).
452
852		 4 pulse only
8 pulse only
453 2 event + 9 pulse inputs (5Hz) for slow counting
451WXT/WMT 4 universal + 1 serial Serial input for Vaisala WXT520 / WMT52 weather sensor*
851WXT/WMT 8 universal + 1 serial Serial input for Vaisala WXT520 / WMT52 weather sensor*

*Weather 
The Vaisala weather sensors are:
WMT52 – wind speed and wind velocity
WXT520 – as WMT52, with rainfall, barometric pressure, RH and temperature.
Note: Vaisala sensors can be powered by the logger batteries/supply.
Eltek can supply the Vaisala sensors if required.

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