Model 195 with Model 43-132

High Range Alpha Ion Chamber

Part Number: 48-3233 and 47-3234

The high-range alpha ion chamber system uses the Model 43-132 Ion Chamber and the Model 195 readout unit. The Model 43-132 is designed to enhance alpha detection, although it is also sensitive to beta-gamma radiation. The Model 195 has a rugged cast aluminum instrument housing with sealed battery compartment that offer an industrial robustness and quality that promote long-lasting protection and instrument life.

Specifications
Documents

Specifications
Documents

Specifications

Model 195 Survey Meter

Range	High Range reads as 0 to 1999 million dpm, but the usable range is 0 to 900 million dpm. Low Range is 0 to 19.99 million dpm
Readout	3½-digit LED
Audio	Headset for audio. Sound frequency increases as meter reading increases
Response	Approximately 5 seconds to 90% of final reading
Connector	5-pin DIN
Calibration Controls	Individual recessed potentiometers for HI/LO Gain and Balance (BAL)
Nul	Surface control for adjusting offset for zero
Warm-Up Time	Allow 5 minutes settling time after initial turn-on
Construction	Drawn-and-cast aluminum case with silk-screened nomenclature, and beige powder-coating
Power	2 to 3 volts at 50 mA, provided by two "D" size batteries
Size (H x W x L)	17.0 x 8.9 x 21.6 cm (6.7 x 3.5 x 8.5 in.)
Weight	1.2 kg (2.7 lb)

Model 43-132 Detector

Window	0.4 mg/cm² metalized polyester
Window Area	100 cm² with 83% open grid
Chamber Volume	Approximately 100 cm³
Sensitivity	Up to 900 Mdpm
Feet	Window screws provide spacing of 0.28 cm (0.11 in.)
Window Spacing	Alpha window spaced 0.25 cm (0.10 in.) from front surface of detector
Power Requirements	Electrode: 85 volts Electrometer: 85 +12/-1.2 volts
Cable	5-pin DIN-type connector with 3 m (10 ft) cord
Signal Out	Analog from 0 to 12 volts
Test	A push-button switch on the back of the detector. Depress switch for a reading of approximately 225 x 10⁶ dpm ± 25%. Take the reading before and after using to confirm detector operation. Test data is only for Model 195 used with the Model 43-132 detector.
Calibration Control	Remove the Cal Cover to expose a column of four holes First hole exposes a subsurface control to allow adjustment of the electrometer offset Second hole exposes a subsurface control to allow adjustment of the detector signal output Third (large) hole allows access to the guard voltage Fourth hole allows access to the anode voltage
Construction	Aluminum body with solder-plated phenolic electrode and 0.4 mg/cm² window with stainless steel protective grid
Size (L x W x H)	20.3 x 10.2 x 10.2 cm (8 x 4 x 4 in.)
Weight	0.51 kg (1.1 lb)

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