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Ludlum 14C with Pancake Probe

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This general purpose, handheld analog ratemeter supports operating two separate radiation detectors. A switch allows the user to select between the internally mounted GM detector with an exposure range of 0–20 mSv/h (0–2000 mR/hr) or an external GM or scintillator detector of choice (see table below).
The aluminum cast instrument housing, with its separate battery compartment and accompanying metal handle, offer an industrial robustness and quality that promote long-lasting protection and instrument life. The front-panel controls include a rotary switch for selecting the five-decade range and instrument shut-off, an audio on/off switch, a fast/slow response switch, a high voltage display button, and a battery test button.
The analog meter face comes in a variety of options to support the measurement units and ranges for the additional external detector selected. A one meter (39 in.) straight type detector cable with “C” style connector is included in the price of the instrument.


Item Numbers


5250-0114 Ludlum 14C with Pancake Probe

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  • Low Price
  • Rugged
  • 5-Range Analog Ratemeter
  • Operates Two Detectors
    – Built-in Internal GM Detector (0–2000 mR/hr)
    – External GM or Scintillator Detector

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  • APPLICATION: alpha, beta, and gamma surveying
  • COMPATIBLE DETECTORS: GM, scintillation
  • DETECTOR CHANNELS: x0.1 through x100 range settings readout the external detector channel, x1000 reads out the internal GM detector
  • EXTERNAL DETECTOR: any GM or scintillator operating on 900 VDC (see available list)
  • INTERNAL DETECTOR: energy compensated GM, 0–20 mSv/h (0–2000 mR/hr), used with x1000 scale only, sensitivity: 200 cpm/mR/hr
  • ENERGY RESPONSE: within 15% of true value between 60 keV-3 MeV (internal detector only)
  • LINEARITY: reading within 10% of true value with detector connected
  • HIGH VOLTAGE: 900 volts
    THRESHOLD: -40 mV to 10 mV
    CONNECTOR: series “C”
  • METER: 6.4 cm (2.5 in.) arc, 1 mA analog type
  • METER DIAL: typically 0 to 2 mR/hr and cpm, BAT TEST (see list of others available)
    • Rotary Selector Switch: switches instrument to Off or ranges: x0.1, x1, x10, x100 x1000
    • Response Switch: toggles between FAST (4 seconds) or SLOW (22 seconds) from 10% to 90% of final reading
    • Reset Push Button: to zero meter
    • Battery Push Button: checks battery status
    • Audio Switch: for audio on/off, built-in unimorph speaker, greater than 60 dB at 0.6 meters (2 ft)
  • POWER: 2 each “D” cell batteries (housed in an externally accessible sealed compartment)
  • BATTERY LIFE: typically greater than 2000 hrs (battery condition can be checked on meter)
  • CONSTRUCTION: cast and drawn aluminum with beige powder coat
  • TEMPERATURE RANGE: -20 to 50 °C (-4 to 122 °F)
  • SIZE: 16.5 x 8.9 x 21.6 cm (6.5 x 3.5 x 8.5 in.) (H x W x D)
  • WEIGHT: 1.6 kg (3.5 lb), including batteries

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