Model 375-20

Monitoring System

Part Number: 48-3245

Features

• Affordable Digital Controller
• Weatherproof Encased-Shielded NaI Detectors
• Programmable Alarms
• Networkable (Requires Ethernet or Webpage Interface Option)
• Battery Backup

The Model 375-20 is a Digital Model 375 Controller coupled to two shielded 5.1 cm (2 in.) diameter by 5.1 cm (2 in.) thick NaI(Tl) scintillation detectors. The detectors are encased in weathertight enclosures suitable for the outdoor environment, but the Model 375 Controller is normally mounted to a wall indoors near an operator. This is a simple, cost-effective system, easy to operate and maintain. The controller supplies local alarms but can also be connected to external alarms or put onto an Ethernet network if desired. Additionally, it has a 48-hour battery backup to keep the system operational in the event power is lost.

See Model 375 for additional detail and available options.

• Specifications
• Options
• Documents

• Specifications
• Options
• Documents

Specifications

Indicated Use	Radiation monitoring
System Operation	Typically located at the scale/entrance area. The system will continuously monitor incoming materials for radiation.
Detectors	2 ea. lead shielded Nal(TI) scintillation detectors, 5.1 x 5.1 cm (2 x 2 in.) (Dia x L), weather-tight housings
Typical Sensitivity (137Cs)	900 cpm per µR/hr per detector
Display	4-digit LED display with 2 cm (0.8 in.) characters
Display Units	kcpm
Status	Green light, instrument functioning properly
Low Alarm	Yellow LOW ALARM light and slow beep, can be set at any point from 0.0 to 9999
High Alarm	Red HIGH ALARM light and fast beep, can be set at any point from 0.0 to 9999
Low BAT	Yellow light, indicates less than 2 hours of battery power remaining
Overload	Displays: “-OL-”, senses detector saturation
Overrange	Displays: “- - - -”, radiation field being measured exceeds counting range of instrument
Audio Alarm Output	85 dB at 0.6 m (2ft), 3 kHz
Remote	Allows for optional connection of red strobe for remote indication of an alarm
Temperature Range	-20 to 50 °C (-4 to 122 °F)
Power	9 Vdc wall-mount adapter, handles any mains voltage in the world, supplied with four sets of prongs for almost any style wall receptacle
Battery Life	Typically 48 hours in non-alarm condition; 12 hours in alarm condition
Battery Charger	Battery is continuously trickle-charged when instrument is connected to line power and turned on
Construction	Aluminum housing with ivory powder-coat finish
Size	Electronics (H x W x L): 18.7 x 24.6 x 6.4 cm (7.5 x 9.7 x 2.5 in.) Detectors (D x L): 8.9 x 22.4 cm (3.5 x 8.8 in.)
Weight	Electronics: 2.9 kg (6.5 lb) Detectors: 5.8 kg (12.7 lb) each

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Options

Option	Description	Part Number
Model 375 Series Options	Various options are available for the Model 375 Series including: Enclosures Remote displays Alarm annunciators Signal outputs Software & networking options	Various

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Documents

• Data Sheet
• Product Manual
• Ethernet Manual Addendum (for instruments with ESP32 Ethernet board)
• CE Certificate

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