Alarm Ratemeter with Pancake GM Probe and Foot Monitor

Can be used as a continuous area monitor, a portable survey meter, or a hand and shoe contamination monitor

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This multi-function instrument can be used as a continuous area monitor, a portable survey meter, or a hand and shoe contamination monitor. It can be powered by wall current, or by its built-in rechargeable battery. Audio features include a built-in speaker with volume control providing click-per-event or an audible full-volume alarm. The alarm can be set at any point on the meter scale and locked. A red lamp on the meter's front panel also indicates an alarm condition. A push-button resets the alarm and zeros the meter. The built-in battery is continuously trickle charged when the unit is operating on line power.

The external pancake probe monitors alpha, beta, and gamma radiation, and is the preferred detector for the majority of medical surveying applications. The Pancake GM Foot Monitor serves as a convenient shoe contamination monitor. Four multiplier settings (x1, x10, x100, x1000), threshold adjustment from 10 to 100 mV, and a toggle switch for FAST (2.2 sec.) or SLOW (22 sec.) response make this unit suitable for a wide range of medical applications.


Portable multi-purpose unit for area monitoring and surveying

  • Monitors alpha, beta, and gamma radiation
  • Audible alarm with red indicator light for continuous area monitoring
  • Portable surveying with Pancake GM Probe (39” cable included)
  • 0-500K cpm range
  • Operates on wall current or rechargeable battery
  • Equipped for simultaneous hand and shoe contamination monitoring


Alarm Ratemeter:

  • Dimensions: 8” w x 5” h x 6” l (20 x 13 x 15 cm)
  • Range: 0-500 cpm with multipliers of x1, x10, x100, x1000
  • Meter: 2.5” (6 cm) panel meter reading 0-500 cpm and BAT TEST
  • Response: FAST (2.2 sec.) or SLOW (22 sec.) for 90% of full scale
  • Input Sensitivity: Factory set at 40 mV, ±15 mV
  • Linearity: Typically ±2% of full scale
  • High Voltage: Adjustable from 400-1500 volts with HV readout
  • Reset: Zeros meter after over range or alarm reading
  • Speaker: Built-in unimorph speaker
  • Alarm: Indicated by a red lamp on the front panel (when in an alarm state, the speaker goes to full volume overriding the volume control); non-locking alarm available upon request
  • Alarm Set: Located on front panel and may be checked with Test Switch; alarm reading will be indicated by audio and visual alarms
  • Recorder: Correlated to meter movement and is adjustable to 1.5 volts at 1 mA
  • Data-out Connector: 9-pin type “D” type series plug with connections as follows: Pin 1: Battery terminal; Pin 2: Unregulated supply; Pin 3: Instrument common ground; Pin 4: Alarm sink; Pin 5: Pulse out; Pin 6: Unbuffered output; Pin 7: Recorder output; Pins 8 and 9: Spare pins.
  • Power: 95 to 250 VAC wall adapter or battery power
  • Battery: 6 volt Gel-Cell rechargeable, with 50 hours typical life (not included)
  • Battery Charger: Continuously trickle charged when the power switch is in the ON position and the instrument is connected to AC power; optional external charger required for fast charge
  • Battery Dependence: Less than 3% calibration change when batteries read within battery test limits on meter
  • Finish: Polyurethane paint, beige
  • Weight: 4.2 lb (2 kg) including batteries

Pancake GM Probe:

  • Indicated use: alpha, beta, gamma surveying
  • Detector: Pancake type halogen quenched GM
  • Window: 1.7 ±0.3 mg/cm2 mica
  • Window Diameter: 1.75” (4 cm)
  • Window Area: Active area approximately 15.5 cm2
  • Efficiency: 10% for C-14, 45% for Sr-90, 38% for Tc-99, 70% for P-32, Alpha 30%
  • Sensitivity: Typically 3300 cpm/mR/hr for Cs-137 gamma
  • Protective Screen: 79% open, stainless steel
  • Mounting: Aluminum holder, handle and window protector
  • Detector Cable: 39” (99 cm), type “C” connectors
  • Dimensions: 8.5” l x 2.75” diameter (21 x 7 cm), handle diameter: 1” (3 cm)
  • Weight: 1 lb (0.5 kg)

Pancake GM Foot Monitor:

  • Indicated use: alpha, beta-gamma foot monitor
  • Detector: 3 ea. pancake type halogen quenched GM
  • Window: 1.7 ±0.3 mg/cm2 mica
  • Window Area: Active 46 cm2, open 27 cm2
  • Sensitivity: Typically 9900 cpm/mR/hr
  • Energy Response: Energy dependent
  • Efficiency (2pi geometry): 10% for C-14, 45% for Sr-90, 38% for Tc-99, 65% for P-32, Alpha 30%
  • Housing: Aluminum
  • Dimensions: 10.8” h x 7” w x 9” l (27 x 18 x 23 cm)
  • Weight: 4.4 lb (2 kg)
  • Cable: 60” (152 cm), type ‘C” connectors (“T” connector included for simultaneous use with Pancake Probe)

Item Number

051-027 Ratemeter, Alarm, 95-250 VAC (Includes: Pancake GM Probe and Foot Monitor)