INDICATED USE: Hazard assessment, emergency re- sponse
DETECTORS: Internal energy-compensated GM detectors
ALERT/ALARM: Indicated by annunciator on display and audible tone
DISPLAY: 4 digit LCD display with 0.5"(1.3cm) high digits, separate annunciators for display units, alert, alarm, low battery, detector overload
BACKLIGHT: Push-button to activate
EFFECTIVE RANGE: Low 0.1mR/hr - 999.9 mR/hr
High 0.1 Rhr - 999.9 R/hr
HIGH VOLTAGE: Two independent controls; each adjustable from 200 - 2500 volts
DISCRIMINATOR: Two independent controls; each adjustable from 2 - 100 mV
OVERLOAD: Indicated by OVERLOAD on display
BATTERY LIFE: Typically 200 hours with alkaline batteries
(24 hours when low battery is first indicated on display)
SIZE:6.5"(16.5cm)H X 3.5"(8.9cm)W X 8.5"(21.6cm)L
WEIGHT: 3.5 lbs (1.6kg) including batteries
RESPONSE TIME: < 4 seconds at 10 mR/hr
ALARM: Flashing daylight-visible LED indication

The following parameters are adjusted by a removable switchboard. Once initial setup and
calibration have been completed the switchboard can be removed without affecting normal
operation of the instrument (Model 2242 may be ordered without switchboard )
BACKLIGHT “ON” TIME: 5, 30, 60, 90, 180, or 240 seconds for the backlight to stay “ON” when activated.
RS-232 DATA DUMP MODE: Enables or disables dump mode to RS-232 port. When enabled data will be dumped every 2 seconds
RS-232 DETECTOR SETUP MODE: Allows for detector parameters to be input by RS-232 port
BAUD RATE: 150, 300, 600, 1200, 2400, 4800, 9600, or 19200 bps.
DEAD TIME: Adjustable from 0 - 9999 µseconds
CALIBRATION CONSTANT: Adjustable from 0.001 - 280 X 109 counts/display unit
AUDIO DIVIDE: 1, 10, 100, or 1000 events-per-click
RATEMETER ALERT/ALARM: Set at any value within the effective range of each detector
LINEARITY: Reading within ±10% of true value with detector connected
AUDIO: Built in unimorph speaker with ON/OFF switch (greater than 60 dB at 2 feet)
CALIBRATION CONTROLS: Accessible from front of instrument (protective cover provided)
RESET: Push-button to zero meter
POWER: 2 each “D” cell batteries (housed in sealed compartment that is externally accessible)
METER: 2.5” (6.4 cm) arc, 1 mA anlog type
CONSTRUCTION: Aluminum housing with beige powder coat paint
TEMPERATURE RANGE: -22 F (-30C) to 122 F (50C)
HUMIDITY: Less that 10% variance in reading from 5%-95% humidity

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