Ludlum Model 19

• Built-In 1" X 1" NaI(Tl) Gamma Scintillator 
• 5 Ranges 
• Splash Proof Shields 

Total Range from 0 - 5,000 µR/hr

Working Environment: Splash proof shields for outdoor use
Indicated Use: Low level (microR) gamma survey
Detector: 1" X 1" sodium iodide (NaI)Tl scintillator
Sensitivity: Typically 175 cpm/microR/hr (137Cs gamma )
Energy Response: Energy dependent
Meter Dial: 0 - 25 microR/hr, 0 - 50 microR/hr, BAT TEST
Range Selections: 0 - 25, 0 - 50, 0 - 250, 0 - 500, 0 - 5000 microR/hr
Light: Push-button to activate
Linearity: Reading within plus or minus 10% of true value
Audio: Built in unimorph speaker with ON/OFF switch (greater than 60 dB at 2 feet)
Calibration Controls: Accessible from front of instrument (protective cover provided)
Response: Toggle switch for FAST (4 seconds) or SLOW (22 seconds) from 10% to 90% of final reading
Reset: Push-button to zero meter<<strong>Power: 2 each "D" cell batteries (housed in sealed compartment that is externally accessible)
Battery Life: Typically 600 hours with alkaline batteries (battery condition can be checked on meter)
Meter: 2.5" (6.4cm) arc, 1 mA analog type
Construction: Cast and drawn aluminum with beige polyurethane enamel paint
Temperature Range: -4° F(-20° C) to 122° F(50° C) 
May be certified for operation from -40° F(-40° C) to 150° F(65° C)
Size: 7.8"(19.8 cm)H X 3.5"(8.9 cm)W X 8.5"(21.6 cm)L
Weight: 4.5 lbs(2.1 kg) including batteries   
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