Ludlum Model 25

  Personal Radiation Monitor/Dosimeter

Features

• 0 to 1000 R/hr Dose Rate Range

• 0 to 1999R Accumulated Dose Range

• Loud Alarms

• Lightweight

• Rugged

• Easy to Use

• 6000 Hour Battery Life

• Intrinsically Safe Version Available

Introduction

The Ludlum Model 25 is a conveniently small sized device designed to warn users anytime they are in a potentially harmful radiation environment. The unit will automatically alarm anytime either the dose rate (.01 mR/hr to 1,000 R/hr) or accumulated dose (0 - 1999 R) setpoints are exceeded with a loud audible signal and blinking display. This small device can be worn on a belt, a lanyard, or armband and is very simple to use and operate.

Specifications

MODEL 25 - PART NUMBER: 48-3584  

MODEL 25-1 (mSv version) - PART NUMBER: 48-3629

DISPLAY RANGE: .01 mR/hr to 1,000 R/hr
RADIATION DETECTOR: Internal energy-compensated G-M
GAMMA SENSITIVITY: 18 cpm/mR/hr
ENERGY RANGE: 60 keV to 2 MeV
DISPLAY: 3½ digit backlit LCD display with a total range from .01 mR/hr (or mR) to 1999 R/hr (or R), also displays time remaining from 19:59 to 00:01 (in hh:mm format)
ALARMS: Radiation alarms adjustable over entire range

• Dose rate alert

• Dose rate (hi)

• Accumulated dose alert

• Accumulated dose (hi)

• Time remaining to allowed dose (hi)

• Time remaining to allowed dose (hi)

• Detector failure

• Low battery notice when only 8 hours remain

ALARM INDICATIONS: Distinct alerts and alarms for exposure and accumulated dose 
AUDIO: Built in speaker (typically 95 dB at 1 foot )
LOW BATTERY INDICATION: Provides 8 hours warning of low battery
LOSS OF COUNT: Detector failure results in a visual and audible warning
CALIBRATION: Requires no tools or software when exposed to a traceable radiation field
POWER: 2 each lithium coin cell batteries
BATTERY LIFE: Typically 6000 hours
CONSTRUCTION: Injection-molded plastic housing with sub-surface printed membrane front panel, completely gasketed for water resistance. Supplied with rubber boot with built-in belt feed-through
TEMPERATURE RANGE: -40°F to 150°F  (-40°C to 65°C)
SIZE: 3.0” H x 2.125” W x 0.687” D  (7.6 cm x 5.4 cm x 1.7 cm)
WEIGHT: 5.1 oz including batteries

This Product is CE Certified

Accessories Included

• Rubber protective sleeve

• Lanyard

Options

• Arm Band

• Nylon Case

Technical Information

• Model 25 Demo - YouTube Video

• Model 25 Data Sheet

• Model 25 Manual

Alternate Instrument

• Model 25-IS: Intrinsically safe version of Model 25

Other Ludlum Products

• Other Ludlum Products

Ludlum Information

• Ludlum Introduction

• Ludlum Resources

• Ludlum Warranty

• Ludlum Repair and Calibration

• Ludlum Training