Model 19 MicroR Meter

Model 19 MicroR Meter Model 19 MicroR Meter controls

Features

The Model 19 is a highly sensitive gamma microR meter employing an internally housed, 2.5 x 2.5 cm (1.0 x 1.0 in.) NaI detector. The measuring range is 0 to 5000 µR/hr. (For µSv/h, use Model 19 Series 8, P/N: 48-2582.) The cast aluminum instrument housing with a 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, and pushbuttons for activating the meter lamp, high-voltage display, battery test, and count reset. The Model 19 is a complete turn-key system and includes two "D" cell batteries.

Note: While the detector used in this instrument is sensitive and is often used for detection of near-background levels of radiation, its nonlinear energy response means that dose and exposure measurements may be over/underreported.

Application Low-level (microR) gamma survey
Detector (D x L) NaI(Tl) scintillator, 2.5 x 2.5 cm (1 x 1 in.)
Detection Range 0 to 5000 μR/hr (for µSv/h, see note below)
Sensitivity (137Cs gamma) Approximately 175 cpm per μR/hr
Energy Response Energy dependent (see Energy Response Curve)
Model 19 Response Curve Linearity Reading ± 10% of true value
Meter Dial 0 - 25 µR/hr, 0 - 50 µR/hr, BAT TEST, High Voltage Test
Meter 6.4 cm (2.5 in.) arc, 1 mA analog type
Controls
Rotary Knob Selector: Switches between: 0 to 25, 0 to 50, 0 to 250, 0 to 500, 0 to 5000 μR/hr, Instrument Off
Response: Toggle switch for FAST (4 s) or SLOW (22 s) from 10% to 90% of final reading
Audio: Built-in unimorph speaker with ON/OFF switch (greater than 60 dB at 0.6 m [2 ft])
High Voltage: Pushbutton to display HV setting on meter
Battery: Pushbutton checks battery voltage
Reset: Pushbutton to zero meter
Lamp: Pushbutton to activate meter light
Calibration Controls: Accessible from front of instrument (protective cover provided)
Working Environment Splashproof shields for outdoor use
Temperature Range -20 to 50 °C (-4 to 122 °F)
May be certified for operation from -40 to 65 °C (-40 to 150 °F)
Power 2 each “D” cell batteries (housed in sealed compartment that is externally accessible)
Battery Life Typically 2000 hours with alkaline batteries (battery condition can be checked on meter)
Construction Cast and drawn aluminum with beige powder coat finish
Size (H x W x L) 15.2 x 8.9 x 21.6 cm (6.0 x 3.5 x 8.5 in.) without handle
Weight 2.04 kg (4.5 lb), including batteries

Ludlum Model 19 manual

Manual