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.
The basic element of the Squirrel data logger consists of the main board and the battery pack. The main board contains the power connector, display, RS232 serial connection, a pulse input, an 8 bit digital signal input and output connector. Up to eight additional input modules are connected to the main board during manufacture depending on the sensor input requirements.
The following 1000 series Squirrels are examples of models from the range:
(24 Voltage/Current + 24 Thermocouple)
99 Channel model
(48 Voltage/Current + 48 PT100)
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.
Number of channels and type of input
|Module||U||K/T||P||V/C||P or V/C||AC||U / AC||pH||Co||B||F||D||Sensor Power||Total channels|
|M27||16 x Relay Input Module||16|
|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|
|D||Event / Digital|
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)
MC - Adds PCcard slot for SRAM memory card
The Squirrel enables cost effective direct connection to a whole range of sensor types including temperature, humidity, and pH with options for pulse, frequency and digital inputs (Ideal for logging contact closures, shaft rotation and digital output form a weighing scale respectively).
There are also inputs available for measuring voltage and current (both AC and DC) .
We can supply various types of probes for the above measurements.
If the sensor or probe for your application is not listed please do not hesitate to contact us as we may already have met and solved a similar problem. We are therefore well placed to recommend a solution or point you to a suitable supplier of probes.
Extra memory is available for the Squirrel in the following sizes:
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.
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.
Eltek has implemented firmware for the 1000 Series Squirrels which will send a text message to up to 10 telephone numbers using the GSM-mdm modem option. See TU1016 - Using a GSMSQ modem with Squirrel data loggers for more details.
|Log / Scan Interval||1 sec to 24 hours Optional: 0.1 sec minimum|
|Analogue Inputs||Accuracy: ±(0.1% of reading, +0.2% of range span) Common mode range: 15V Input Impedance: 1MW|
|Sensor Excitation||5V / supply voltage - internally selectable Digital Inputs 0 / 5V or volt free contacts 8 inputs per logger channel|
|Pulse counters||Each counter up to 2KHz signal or 100Hz volt free contact. A total of 650K counts software selectable|
|Data memory||Internal memory: 250,000 readings Option: 2 million readings or PC slot with SRAM card (2 million readings) Memory modes: stop when full or continuous|
|Scaling Data||Readings scaled as engineering units|
|Configuration||Panel controls and display and/or Darca Lite or Darca Plus (PC Software)|
|Display||2 line, 32-character display for local status monitoring, configuration and stored readings|
|Communications||RS232 half duplex - 2400 to 38.4K Baud Modem compatible protocol|
|Darca Software||Darca Lite for control, download and export Darca Plus with graphing and analysis tools|
|Power supply||Internal: 6 x AA Alkaline batteries External: 9 to 14 VDC (1.4 watts) Mains adapter: 12 VDC 6 watts Battery Life: sampling 8 channels every 5 minutes provides typically 6 months operation|
|Case||Scratch resistant Nextel coated ABS width 180mm, height 120mm, depth - see table below|
|Operating Environment||Temperature range:-30 to 65°C Humidity: 95% non condensing. For harsh environments an optional IP67 enclosure is available|