Model 12

General Purpose Survey Meter

Part Number: 48-1609

Features

Low Price
Rugged
4-Range Analog Ratemeter
Supports GM, Proportional, and Scintillation Type Detectors
Greater Than 2000 Hour Battery Life

This general purpose, handheld analog ratemeter supports GM, proportional, and scintillation type detectors. The analog meter face comes in a variety of options to support the measurement units and ranges for the optional external detector selected.

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 four-decade range, instrument shut-off and battery test, an audio on/off switch, a fast/slow response switch, a high voltage display button, and a count reset button.

A one-meter (39 in.) straight type detector cable with "C" style connector and batteries are included in the price of the instrument.

Specifications

Application	Alpha, Beta, and Gamma Surveying
Compatible Detectors	GM, Proportional, Scintillation
Detection Range	Dependent on detector
Linearity	Within 10% of true value with detector connected
Meter Dial	0 - 500 cpm, 0 - 2.5 kV, BAT TEST (Meter Faces tab lists other available meter faces)
Controls	Rotary Selector Switch: Off, Battery check, Range selections: ×1, ×10, ×100, ×1000 Response Switch: Toggles between FAST (4 s) of SLOW (22 s) from 10% to 90% of final reading Reset Button: Zeroes meter High Voltage Check Button: View high voltage setting on meter face Audio Switch: On/Off, Built-in unimorph speaker, 60 dB at 61 cm (2 ft) Calibration Controls: Accessible from front of instrument (protective cover provided)
High Voltage	Adjustable from 400 to 2500 Vdc
Threshold	-1 to -100 mV
Window	No
Overload	Optional
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	Two each "D" cell batteries (housed in an externally accessible sealed compartment)
Battery Life	Typically greater than 2000 hours (battery condition can be checked on meter)
Construction	Cast and drawn aluminum with beige powder coating
Detector Connector	Type "C" series (others available)
Size (H x W x L)	16.5 × 8.9 × 21.6 cm (6.5 × 3.5 × 8.5 in.)
Weight	1.6 kg (3.5 lb) including batteries

Meter Faces

This table lists the most commonly used meter faces. Others are available upon request.

Meter Face	Description	Detectors
202-356	0 - 500 cpm 0 - 2.5 kV BAT TEST	Any
202-365	0 - 420 cpm 0 - 0.2 mR/hr 0 - 2.5 kV BAT TEST	Model 44-7
202-618	0 - 660 cpm 0 - 0.2 mR/hr 0 - 2.5 kV BAT TEST	Model 44-9
202-459	0 - 0.2 mR/hr 0 - 2.5 kV BAT TEST	Model 44-6
202-470	0 - 50 cpm 0 - 2.5 kV BAT TEST	Any
202-635	0 - 500 cpm 0 - 2.5 kV BAT TEST	Any (for Model 12 Digital)
202-799	0 - 12 cps 0 - 2 µSv/h 0 - 2.5 kV BAT TEST	Model 44-9

Options

Option	Description	Part Number
Portable Scaler Option	Adds scaler counting capability. Includes digital readout, count time selector switch, and count control button.	4464-114
Overload Indicator Option	Adds Overload indicator with a light.	4464-130
Detector Clips	Stainless steel clip attaches to instrument handle or case facilitating one-handed carrying of instrument and detector.	Depends on detector.
Lighted Handle	Handle with LED to illuminate the instrument display.	4464-154
Shoulder Strap	Adjustable nylon shoulder strap.	4363-413
Headphone Jack	Adds headphone jack to instrument.	4464-464
Stereo/Mono Headphones	Adjustable stereo/mono headphones.	22-9313
Transport & Storage Case - Small	Rugged, dust- and waterproof transport and storage case.	2311062
Plastic Disk Check Sources	General purpose check sources used to check instrument response.	Depends on source material and activity.
Mechanical Check Source Holder	Check source holder with swing-away door that attaches to instrument housing.	4062-166
Stick-On Check Source Holder	Adhesive check source holder that attaches to instrument housing.	4464-473