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Model 4901P

Beta-Gamma Hand & Foot Monitor

Part Number: 48-3009

Features

Affordable
Simple to Use
Automatic Background Subtract
Password-Protected Parameters
Alarm Audio Volume Adjustment
Non-Volatile Memory Requires No Battery Backup

The Model 4901P Beta-Gamma Hand & Foot Monitor is intended for use as a medium-level beta and gamma contamination monitor. Four count channels are in the standard configuration for monitoring the palm of each hand and the sole of each foot. The Model 4901P employs a total of twenty-two pancake Geiger-Mueller (GM) type detectors, five in each hand detector (palm side only) and six in each foot detector. LED indicators show status and alarm location. The Model 4901P allows parameter updating by viewing the built-in, 16-character LCD display. Detector counts, background, alarm set points, and all parameters may be viewed on the LCD display. Switches at each hand detector initiate an interrogation (both switches must activate). Audible alarm and status change indications are standard.

Specifications

Indicated Use	Personnel monitoring
Detectors	Pancake-type, halogen-quenched GM
Window	1.7 ± 0.3 mg/cm² mica
Energy Response	Energy dependent
Hands	10 (five per hand) pancake GM detectors
	Active Area	Approximately 155 cm² (24 in²)
	Open Area	Approximately 122 cm² (18.9 in²)
	Efficiency	¹⁴C	3%
		⁹⁹Tc	12%
		¹³⁷Cs	12%
Shoes	12 (six per shoe) pancake GM detectors
	Active Area	Approximately 185 cm² (28.7 in²)
	Open Area	Approximately 146 cm² (22.6 in²)
	Efficiency	¹⁴C	3%
		⁹⁹Tc	10%
		¹³⁷Cs	10%
Audio	Built-in, unimorph-type speaker (greater than 68 dB at 0.6 m [2 ft])
Alarm	Indicated by red LED and audible signal (each hand and shoe area has alarm indicators)
Counting Capacity	9999 counts per minute
Count Time	Adjustable from 1 to 99 seconds
Alarm Hold Time	Adjustable from 1 to 99 seconds
Background Accumulate Time	Adjustable from 1 to 99 seconds
Background Update Interval	Adjustable from 1 to 99 minutes, system will automatically update background if instrument is not in use
Force Update	Timed function to force background update if regular update interval is exceeded
Status Indicators	Ready	Green LED, indicates instrument is ready to monitor personnel
	Counting	Green LED, indicates count is in process (activated by switches on hand probes)
	Check OK	Green LED, indicates person being monitored is clean
	Short Count	Yellow LED and continuous audible beep, indicates user has released hand switches before count is complete or count is attempted during background update
Power	95 to 135 Vac (178 to 240 Vac available), 50/60 Hz
Temperature Range	0 to 50 °C (32 to 122 °F) (LCD limits temperature range)
Size (H x W x L)	101.6 x 74.9 x 38.1 cm (40 x 29.5 x 15 in.)
Weight	20.5 kg (45 lb)

Description	Part Number
GM Tube	01-5050