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| Ludlum's Model 19 MicroR Survey Meter. |
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FeaturesIntroduction The Model 19 is a highly sensitive gamma µR/meter employing an internally housed, 2.5 cm diameter by 2.5 cm thick (1.0 x 1.0 in.) NaI detector. The measuring range is 0-50 µSv/h (0-5000 µR/hr). The cast aluminum instrument housing with its 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. Specifications INDICATED USE: low-level (μR) gamma survey MEASUREMENT RANGE: 0-50 μSv/h (0-5000 μR/hr) DETECTOR: 2.5 x 2.5 cm (1 x 1 in.) NaI (Tl) scintillator SENSITIVITY: ≈ 17,500 cpm/μSv/h (175 cpm/μR/hr) (137Cs gamma) ENERGY RESPONSE: energy dependent |
| LINEARITY: reading ±10% of true value METER: 6.4 cm (2.5 in.) arc, 1 mA analog type METER DIAL: 0-25 µR/hr, 0-50 µR/hr, BAT TEST, High Voltage Test CONTROLS:
ROTARY KNOB SELECTOR: 0-25, 0-50, 0-250, 0-500, 0-5000 μR/hr, Instrument Off
WORKING ENVIRONMENT: splashproof shields for outdoor useRESPONSE: toggle switch for FAST (4 seconds) or SLOW (22 seconds) from 10% to 90% of final reading AUDIO: built-in unimorph speaker with ON/OFF switch (greater than 60 dB at 0.6 meters [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) 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 polyurethane enamel paint SIZE: 15.2 x 8.9 x 21.6 cm (6.0 x 3.5 x 8.5 in.) (H x W x L), without handle WEIGHT: 2.04 kg (4.5 lb), including batteries |  |  |
| Ludlum's Model 19 MicroR Survey Meter w/Alarm. |
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Features Introduction The Model 19A is a highly sensitive gamma MicroR/meter with alarming capability employing an internally housed 2.5 cm diameter by 2.5 cm thick (1.0 x 1.0 in.) NaI detector. The display is an analog logarithmic meter scale with a range of 0-5 µSv/h (0-500 µR/hr), so switching between scales is not necessary as on many other instruments. The front panel controls include a three-position rotary switch for Off, Battery Check, and On, an Audio On/Off switch, and an Alarm Reset button. A red alarm light is mounted on the front panel and is accompanied by an audio signal. The alarm circuit is adjustable over the entire scale range. The cast aluminum instrument housing with its separate battery compartment and accompanying metal handle offer an industrial robustness and quality that promote long lasting protection and instrument life. The Model 19A is a complete turn-key system and includes two "D"cell batteries. Specifications APPLICATION: low level (μR) gamma survey DETECTOR: 2.5 x 2.5 cm (1 x 1 in.) (D x L) NaI(Tl) scintillator |
| SENSITIVITY: approximately 17,500 cpm/µSv/h (175 cpm/μR/hr) (137Cs gamma) RESPONSE: dependent on number of counts present (typically not greater than 7 seconds from 10% to 90% of final reading) ENERGY RESPONSE: energy dependent, see graph below LINEARITY: reading ±10% of true value METER DIAL: 0-5 µSv/h (0-500 μR/hr) dual colored logarithmic scale, BAT TEST METER: 6.4 cm (2.5 in.)arc, 1 mA analog type ALARM RANGE: 0 to off-scale ALARM: indicated by red lamp and audible tone (alarm audio overrides the audio ON/OFF switch) CONTROLS:
ROTARY KNOB SELECTOR: Instrument Off, Battery Check, Instrument On
POWER: 2 each "D" cell batteries (housed in sealed compartment that is externally accessible)AUDIO: ON/OFF switch, built-in unimorph speaker (greater than 60 dB at 61 cm [2 ft]) ALARM RESET: pushbutton reset alarm CALIBRATION CONTROLS: accessible from front of instrument (protective cover provided) BATTERY LIFE: typically 600 hours with alkaline batteries (battery condition can be checked on meter) CONSTRUCTION: cast and drawn aluminum with beige polyurethane enamel paint 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) SIZE: 19.8 x 8.9 x 21.6 cm (7.8 x 3.5 x 8.5 in.) (H x W x L), with handle WEIGHT: 2.1 kg (4.5 lb), including batteries |  |
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