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Environmental Monitoring


Long Battery Life

Records for 2 Weeks


The Field Unit is a recording environmental monitor that is designed to collect the history of radiation levels over an extended period of time under adverse field conditions. Once the instrument is started, it measures the penetrating radiation level for a preset interval, stores the information in its memory and repeats the sequence until it is stopped or the memory is full. Using a five minute interval, it can store up to two weeks of time correlated data.

The instrument has the capability of starting the storing procedure at a predetermined date and time, and displaying all the preset parameters as well as the present and maximum dose rates. To obtain a history of the radiation levels since the Field Unit was started, the external connector has a serial communications link for interrogating, changing all keyed in values, and for data retrieval. A computer program is available to obtain the data from the Field Unit. A hard copy of all the data can then be printed or saved.

The data is also transmitted from the communications link every minute. This allows the instrument to be used as an autonomous field area monitor.

The 16 key keyboard is used to display and change all the important internal parameters. This includes, among others, a user number to facilitate tracking of the data, battery hours, status and of course the data. Numeric data is entered with the 16 key keyboard. A special mode is used to calibrate the instrument.

The Field Unit uses an energy compensated GM detector. The waterproof case is constructed of high impact plastic with a gasket seal which must be opened to gain access to the keyboard and batteries.


Dimensions: 10.2 x 7.3 x 3.5 In (25.9 x 18.5 x 8.9 cm)
Weight: 7.4 lb (3.4 kg)
Case: Waterproof high impact plastic with lid gasket
Type: Compensated GM Counter
Sensitivity: 2700 CPM/mR/h

Readout: 4 Digit LCD with 0.4” digits (-20 to 50 °C)
Control: On/off Power, 16 key keyboard
Range: 0.001 to 50.00 mR/h Averaged over interval setting
Memory Storage Capacity: 4050 Data Points
Interval Range: 1 to 5 minutes
Collection Time: 1 Min interval: 2.8 days, 5 Min interval, 14 days
Battery: 6 D cells, 2 AA cells for battery backup and clock
Battery life: 900 hours
Temperature dependence: +/- 10% -20 to 50 °C
Connectors: External jack for communications link
Communications: RS-232
Rate response: +/- 10% 0 to 50 mR/h (dead time correction built in)

Preprogrammed for any function
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Specifications subject to change without notice.
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