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Portal Monitor : Model 52-1-1 Portable Portal Monitor

Model 52-1-1 Portable Portal Monitor

Ludlum Model 52-1-1


  • Portable
  • Plastic Scintillation Detectors
  • Assembles or Disassembles in less than 5 Minutes
  • Carrying Case Included

In an independent study by the Human Monitoring Laboratory, the Ludlum 52-1-1 was compared to three other reputable portal monitors. The study found that the Ludlum 52-1-1 was the best choice for monitoring beta radiation or low energy gamma radiation.1

Portable personnel monitoring (NOTE: This instrument is portable and can be assembled or disassembled in less than 5 minutes. Carrying case is included)
DETECTORS: 4 ea. 168 cubic inch plastic scintillation allowing a total detection area of 672 cubic inches
THRESHOLD: 4 plus or minus 1 mV
DISPLAY: 2 line X 20 character LCD shows background rates from all detectors, and sigma values above background.
ALARM: Indicated by red LED, and audible signal (greater than 60 dB at 2 feet)
COUNT TIME: Adjustable from 0 - 20 seconds (0 second setting is for walk through mode)
ENTER/CHECKING: (green LED) Indicates system is ready for use. Flashing LED indicates a count is in progress.
INCOMPLETE/UPDATING: (amber LED) Indicates the user has stepped out of the portal before counting was completed, or that an update is in progress.
FAILURE: (red LED) Indicates a high or low background
INFRARED SENSOR: A retro-reflective sensor senses portal occupancy
PARAMETERS: All parameters are stored in non-volatile memory
OUTPUT: RS-232 and relay output connectors located on the bottom of the electronics chassis
POWER: 85 - 250 VAC, 50 - 60 Hz single phase (less than 100 mA); or 3 ea. "D" cell batteries.
BATTERY LIFE: Typically 24 hours in a non-alarm condition
Construction: Aluminum housing with beige polyurethane enamel paint
Temperature Range: -4º F(−20ºC) to 122º F(50º C)
Size: 83″ (211 cm) H x 36″ (91.4 cm) W x 18″ (46 cm) D
Portal Dimensions: 81″ (206 cm) H x 32″ (81.3 cm) W (see below for Model 52-1 specifications)
Weight: 70 lbs (32 kg)
Shipping Weight: 100 lbs (45 kg)

Click Here for the printable Ludlum 52-1-1 Info Sheet. (PDF format)

1 Ludlum 52-1-1 Comparison Study by Human Monitoring Laboratory