Ludlum Model 3 w/ 44-9 G-M Pancake-RENTAL

The Ludlum Model 3 Survey Meter is the industry standard of radiation survey meters.  The meter has a rugged design and microprocessor electronics. It operates on two "D" cells for approximately 2000 hours. The Ludlum Model 3 has adjustable high voltage to 1500 volts and includes external calibration controls. The four counting ranges are x0.1, x1, x10, x100.  Typical Counting Range is from 0 - 200 mR/hr, or 0 - 500,000 cpm. 

• Application: Alpha, Beta, and Gamma surveying
• Compatible Detectors: GM, Scintillation
• Detection Range: 3300 cpm per mR/hr
• Linearity : Reading within 10% of true value with detector connected
• Meter Dial:0 - 2 mR/hr, or 0 - 500 kcpm, BAT TEST
• Meter: 6.4 cm (2.5 in.) arc, 1 mA analog type
  
• Controls
• Rotary Selector Switch Switches between: Instrument off; Battery check; Ranges: x0.1, x1, x10, x100
• Response Switch Toggles between FAST (4 s) or SLOW (22 s) from 10% to 90% of final reading
• Reset Pushbutton Zeroes meter
• Audio Switch Audio on/off, built-in unimorph speaker, greater than 60 dB at 0.6 meters (2 ft.)
• Calibration Controls
• Accessible from front of instrument (protective cover provided)  
• from front of instrument (protective cover provided)
• High Voltage: Adjustable from 400 to 1500 Vdc
• Threshold: Fixed at -35 mV ± 10 mV
• Temperature Range:-20 to 50 °C (-4 to 122 °F)
• Power: Two each "D" cell batteries housed in externally accessible sealed compartment
  
• Battery Life: Typically greater than 2000 hours with alkaline batteries (battery condition can be checked on meter)
• Construction: Cast and drawn aluminum with beige powder coat
• Connector: Series "C" (others available)
• Size (H x W x L): 16.5 x 8.9 x 21.6 cm (6.5 x 3.5 x 8.5 in.), including handle
• Weight:1.6 kg (3.5 lb), including batteries

• Indicated Use: alpha, beta, and gamma survey; frisking, sample counting
• Detector: pancake-type, halogen-quenched GM
• Window: 1.7 ± 0.3 mg/cm2mica
• Window Area: Active - 15.51 cm2  (2.4 in2 ); Open - 12.26 cm2 (1.9 in2)
• Efficiency (4Ï€): 5% for 14C; 22% for 90Sr/90Y; 19% for 99Tc; 32% for 32P; 15% for 239Pu; ≤1% for 99mTc; 0.2% for 125I
• Sensitivity: typically 3300 cpm/mR/hr (137Cs gamma)
• Energy Response: enegry dependent, see optional energy fi lters (below) and at http://www.ludlums.com
• Background: 60 cpm
• Dead TimeME: typically 80 microseconds
• OPERATING VOLTAGE: 900 Vdc
• CONNECTOR: series “C” (others available)
• CONSTRUCTION: aluminum housing with beige powder-coat fi nish, and stainless steel protective screen (79% open)
• TEMPERATURE RANGE: -15° to 50 °C (5° to 122 °F); may be certifi ed to operate from -40° to 65 °C (-40° to 150 °F)
• SIZE: 4.6 x 6.9 x 27.2 cm (1.8 x 2.7 x 10.7 in.) (H x W x L) (other handle lengths are available)
• WEIGHT: 0.5 kg (1 lb)
• ENVIRONMENTAL RATING: IP (Ingress Protection) rating of 53