Model 3019 MicroR Meter

Internal Scintillation Probe

Ludlum Measurements

Model 3019 meter face and controls Model 3019 MicroR Meter

The Model 3019 is a portable and versatile instrument with an internal detector used for background measurements of gamma radiation levels up to 500 µSv/h (50 mR/hr). The internal CsI scintillation detector has a sensitivity of 175 cpm per µR/hr. It features a large, easy-to-read LCD screen and audible alarms and is controlled using a simple five-button interface. The meter body is made of high-impact plastic and splash resistant construction allows the instrument to be used outdoors.

Three modes of operation are available - RATE, MAX, and COUNT - which can be selected by pressing the MODE button. Measurements can be collected in two sets of units (primary and secondary) for RATE and MAX modes in cps, cpm, mR/h, or µSv/h units. The user can switch between the two sets of units by pressing the UNITS button. A sigma audio mode can be enabled that allows the user to find small increases above the background radiation level. When enabled with the optional Lumic Data Logger Kit (see Options), data can be logged in any of the operational modes using the LOG button on the handle. Up to 1000 data points can be stored internally.

Instrument setup can be done either through the front-panel controls or via the Lumic Calibration Kit (see Options). The Model 3019 is shipped ready to use with batteries and calibration certificate.

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. (See graph below.)

3019 MicroR meter energy response curve

Detector (D x L) Internal CsI scintillator, 2.5 x 1.9 cm (1 x 0.75 in.)
Sensitivity175 cpm per µR/hr
Energy Range Nonlinear
Linearity Reading within 10% of true value
Display 3 digit LCD with large 20 mm (0.8 in.) digits.
Units (k)cps, (k)cpm, (µ)(m)R(/h), (µ)(m)Sv(/h)
Indicators bar graph, MAX, ALARM, USB, audio, low-battery.
Detector Range Background to 500 µSv/h (50 mR/hr)
Backlight Built-in ambient light sensor automatically activates low-power LED backlight, unless internal dipswitch is set to continuous-On (will reduce battery life)
Controls
ON/OFF: Press to turn ON; Tap to acknowledge alarms and silence alarm tone; Press to reset sigma audio alarm; Hold for OFF
UNITS: Changes the units between count rate (cpm, cps), or dose/exposure (µSv/h, mR/h)
AUDIO: Turn "click" audio On/Off; Turn sigma audio beep On/Off
MODE: Alternates between RATE (count rate), MAX (captures peak rate), and COUNT (user-selectable preset count time from 0 to 10 min.). Number of modes can be reduced in setup.
LOG: Press to store meter reading (requires Lumic Data Logger Kit, see Options)
Data Logging Can store up to 1000 data points internally. Requires Lumic Data Logger Kit (see Options).
Response Time User-selectable from 1 to 60 seconds, or Auto-Response Rate FAST or SLOW
Alarms Alarm setpoints adjustable over the display's range (see manual)
Sigma Audio Mode Alarm that allows user to find small increases above the background radiation level. The instrument will beep whenever it measures a rate that exceeds a threshold rate above the measured background rate.
Overload Protection High count rate saturation protection prevents false display of lower count rates
Loss of Count Protection After a user-settable time interval (default of 60 seconds) of no pulses from the detector, unit will flash a zero reading and the alarm audio will be triggered
Dead Time Correction Employs first and second order corrections for extended performance
High Voltage 400 to 1500 Vdc
Threshold -20 to -100 mVdc
Audio Greater than 75 dB at 0.6 m (2 ft), approximately 4.5 kHz
Power Four alkaline or four rechargeable “AA” batteries (instrument does not support in-device charging)
Battery Life Approximately 750 hours of operation (as low as 100 hours with backlight configured for continuous-on), 16-hour low battery warning
Construction High-impact plastic with water-resistant rubber seals and separate battery compartment
Temperature Range -20 to 50 °C (-5 to 122 °F)
May be certified for operation from -40 to 65 °C (-40 to 150 °F)
Enviornmental Rating NEMA rating of 5 or IP rating of 53
Size (H x W x L) 16.5 x 11.4 x 21.6 cm (6.5 x 4.5 x 8.5 in.)
Weight 1.06 kg (2.3 lb)

Ludlum Model 3019 manual

Manual