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Operating modes Rate, Integrate, Scaler (dual option): “Based On Measurement” or “Based On Time”,
Timed Peak Hold, Data Logging
Accuracy Within 10% of reading between 10% to 100% of full scale;
indication on any range, exclusive of typical energy dependence.
Accuracy is probe dependent
Detector Accepts GM detectors and scintillation probes operating at
high voltages between 500 and 1300 volts
Temperature range 14° to 122°F (- 10° to + 50°C)
Relative humidity 0 to 95%, non-condensing
Warm up time 5 second diagnostic check
Check source Natural uranium, mounted on the case
Power requirements Two “D” cells, 150 hours operation,
automatically indicates when battery is low
Housing material Proprietary polycarbonate, splash-proof case
Display Liquid crystal display, 2.2 x 2.2 in (5.6 x 5.6 cm)
Data logging modes The ASM-990 series Log Data feature can easily be accessed via the
Setup Sub-menu.
The unit can log/save a maximum of 500 data points in any of three
separate modes (Manual and Survey modes can utilize the optional
barcode scanner)
Manual Individual rate data points can be saved by pressing
the Start/Stop/Rst /Save button- Timed A data point will
automatically be saved at user
selectable time intervals in the
range of 1 to 255 seconds
- Survey Programmed sequences
can be accessed via the menu
system. Pressing the Start/Stop/Rst /Save button saves the
current reading and displays the
next survey location.
Programming of survey
sequences, as well as retrieval of
logged data, is accomplished via
the built-in IrDA port.
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Label names up to 20 characters
can be programmed into the unit
to identify the individual survey locations
Weight (without probe) ASM 990, 992 2.1 lb (0.95 kg),
ASM 993 2.4 lb (1.09 kg)
Dimensions 4.125 (w) x 10.91 (d) x
2.5 in (h) (10.47 x 27.71 x 6.35 cm)
Probe connector The unit is
available with a MHV connector
The unit can be used with multiple
probes (5 total) by selecting the
appropriate probe from the main
menu. All calibration data for
each probe is stored in the unit’s
EEPROM
Specifications for ASM-992 and ASM-993
internal energy compensated
1 R/hr GM
detector
Range 0.1 mR/hr to 1 R/hr
Radiation detected Gamma above 60 keV
Accuracy ± 10% of reading between 10% and 100% of full scale on
any range, exclusive of energy dependence
Specifications for ASM-993 internal pancake
detector
Radiation detected Alpha above 3.5 MeV, beta above 35 keV and
gamma above 6 keV
Range Background to 80 mR/hr
Window 15 cm2 (1.75 in Ø) mica, 1.4 to 2.0 mg/cm2
Typical background 30 CPM Protective screen Stainless steel, hexagonal pattern providing 86%
open area
Accuracy ± 10% of reading between 10% and 100% of full scale on
any range, exclusive of energy dependence (protective cover open)
Note The ASM-990 series, with the customer selected probe is
calibrated to NIST standards. The ASM-990 series with GM probe
standard calibration is in R, Sv, and rems. Scintillation detectors are
calibrated in counts. Radionuclide specific efficiency calibrations are
available upon request.
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