Model 12S

microR Survey Meter

Part Number: 48-1610

Features

• High Sensitivity to Gamma
• 0 to 3000 μR/hr Range
• Rugged
• 4-Range Analog Meter

The Model 12S is a high sensitivity gamma microR (μR) meter employing an internally housed 2.5 x 2.5 cm (1 x 1 in.) NaI detector. 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 and instrument shut-off and battery test, an audio on/off switch, a fast/slow response switch, and a count reset push button. The Model 12S is a complete turn-key system and includes two "D" cell batteries.

• Specifications
• Meter Faces
• Options
• Documents
• Replacement Parts

• Specifications
• Meter Faces
• Options
• Documents
• Replacement Parts

Specifications

Indicated Use	Low-level (μR) gamma survey
Detector (D x L)	NaI(Tl) scintillator, 2.5 x 2.5 cm (1 x 1 in.)
Typical Sensitivity (137Cs)	175 cpm per µR/hr
Energy Response	Energy dependent
High Voltage	Adjustable from 400 to 1500 Vdc
Threshold	Adjustable from 30 to 100 mV
Meter Dial	0 - 3 µR/hr, BAT TEST (Meter Face tab lists other available meter faces)
Controls	Rotary Selector Switch: off, battery check, range selections for x1, x10, x100, x1000 Reset Button: to zero meter High Voltage Check Button: view high voltage setting on meter face Response Switch: toggles between FAST (4 seconds) or SLOW (22 seconds) from 10% to 90% of final reading 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)
Power	Two each "D" cell batteries (housed in externally accessible sealed compartment)
Battery Life	exceeds 600 hours
Construction	cast and drawn aluminum with beige powder coat
Size (H x W x L)	22.2 x 21.6 x 8.6 cm (8.8 x 8.5 x 3.4 in.) with handle
Weight	2.1 kg (4.6 lb), including batteries

---

Meter Faces

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

 

Meter Face	Image (click to view larger)	Description
202-004		0 - 4 microR/hr BAT TEST
202-333		0 - 5 microR/hr BAT TEST
202-419		0 - 0.03 microSv/h BAT TEST

---

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
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
Plastic Disk Check Sources	General purpose check sources used to check instrument response.	Depends on source material and activity.

---

Documents

• Data Sheet
• Product Manual
• CE Certificate

---

Replacement Parts

Description	Part Number
NaI(Tl) Scintillator glued to PMT, Non-Based with Voltage Divider	2004-033
NaI(Tl) Scintillator with PMT, Non-Based with Voltage Divider	40-5154
Detector Assembly (Includes 2004-033)	47-1574

---