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Model 375P-336 Series

Monitoring System

Features

Excellent Surface Contamination Screening Tool for Small Articles, Baggage, Packages, and Medical Waste
Affordable Digital Controller
2 Large Plastic Scintillator Detectors
Programmable Alarms
Networkable (Requires Ethernet or Webpage Interface Option)
Includes Check Source for Calibration
24-Hour Battery Backup

The Model 375P-336 Series are monitoring systems that consist of a Model 375P digital controller coupled with two lead shielded 2753 cm³ (168 in³) plastic scintillation detectors. The Model 375P-336 is designed for indoor applications, while the Model 375P-336‑1L has detectors housed in waterproof enclosures that can be mounted outdoors. The Model 375P controller is not weatherproof and must be mounted either indoors or within an environmental enclosure (available separately).

These simple and cost-effective solutions offer a system that is 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. Each system has a 24-hour battery backup to keep it operational in the event power is lost.

Medical Application

The Model 375P-336 Series are ideal for monitoring personnel or laundry for possible contamination in a nuclear medicine department. The monitor may also be used as a radiation contamination triage device to alert emergency department personnel of potentially contaminated patients or equipment coming into the emergency room. In environments where equipment, carts, or other traffic may strike and damage the detectors, Ludlum Measurements encourages the use of an optional protective rail (PN 2311167).

Surface Contamination Inspection

Inspecting items using handheld instruments can be too time consuming in many cases. The Model 375P-336 Series facilitate more rapid and uniform inspections by placing two relatively large scintillation detectors in close proximity to incoming or outgoing articles undergoing inspection. Both detectors are continuously monitored by the digital controller so any contaminated item can immediately trigger an alarm. Alarm conditions can be set up to automatically halt production conveyance devices, notify the central office, and even alert key personnel to initiate an immediate response.

Also Available

Model 375P-336V & Model 375P-336-1LV: These versions include IR sensors that prevent the unit from alarming unless something is passing between the detectors and the alarm threshold has been exceeded.

Specifications

Detectors	2 ea. 2753 cm³(168 in³) plastic scintillation detectors. Each detector has 3 mm (0.125 in.) thick lead shielding on the back and sides and is supplied with a 15.2 m (50 ft) coaxial cable.
Typical Sensitivity (¹³⁷Cs)	200 cps per µR/hr per detector
Display	4-digit LED display with 2 cm (0.8 in.) digits
Range	0.1 to 9999 kcps
Linearity	Reading within 10% of true value
Status Indicators	Status: green light indicates instrument is functioning properly Sigma Alarm: indicated by red ALARM light and audible tone (can be set at any point from 0.1 to 999 sigma) Sum Alarm: indicated by red ALARM light and audible tone (can be set at any point from 0.1 to 9999 kcps) Detector Fail: red light (DET FAIL) and audible tone greater than 68 dB at 61 cm (2 ft), indicates no counts from detector or instrument failure Low Battery: yellow light (LOW BAT), indicates less than 2 hours of battery power remaining Overload: display reading of "–OL–" and audible FAIL alarm indicate detector saturation Overrange: display reading of "– – – –", indicates measured radiation field has exceeded counting range of instrument
Alarm Response Time	2 seconds or less, based on internal dip switch setting
Relay Output	Mains (120 or 240 Vac) output on alarm, 9-pin connector providing RS-232 output, signal ground connection, FAIL and ALARM signals (current sink), and direct connection to battery and ground
Calibration Controls	Accessible from front of instrument (protective cover provided)
Power	95 to 135 Vac (178 to 240 Vac available), 50–60 Hz, 6 V sealed lead-acid rechargeable battery (built-in)
Battery Life	Typically 24 hours in non-alarm condition, 6 hours in alarm condition
Battery Charger	Battery is continuously trickle-charged when instrument is connected to line power and turned on
Construction	Electronics: aluminum housing with ivory powder-coat Model 375P-336 Detectors: aluminum housing with ivory powder-coat Model 375P-336-1L Detectors: weatherproof aluminum housing with ivory powder-coat
Environmental Rating	Electronics: IP51 (IP66 with Model 375P environmental enclosure) Model 375P-336 Detectors: IP50 Model 375P-336-1L Detectors: IP66
Temperature Range	-15 to 50 °C (5 to 122 °F)
Size (H x W x D)	Electronics: 26.2 x 24.6 x 8.4 cm (10.3 x 9.7 x 3.3 in.) Model 375P-336 Detectors (ea.): 104.1 x 17.1 x 5.3 cm (41 x 6.8 x 2.1 in.) Model 375P-336-1L Detectors (ea.): 104.1 x 17 x 7.6 cm (41 x 6.7 x 3 in.)
Weight	Electronics: 4.2 kg (9.3 lb) Model 375P-336 Detectors (ea.): 11.3 kg (25 lb) Model 375P-336-1L Detectors (ea.): 14.1 kg (31 lb)

Configurations

Model	Detectors	Part Number
375P-336	Two lead shielded 2753 cm³ (168 in³) plastic scintillation detectors. Indoor use only.	48-3285
375P-336-1L	Two lead shielded 2753 cm³ (168 in³) plastic scintillation detectors in waterproof enclosures. Can be used outdoors.	48-4427

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
Vehicle Presence Sensors	Infrared sensors prevent the unit from alarming unless a vehicle is being surveyed and the alarm threshold has been exceeded. Included in Models 375P-336V and 375P-336-1LV.	4396-1036