The Model 375 is a versatile, compact, and very affordable digital electronic controller designed for monitoring radiation in areas. Its simple design accommodates many different detectors suiting a wide variety of applications, and is equipped with a local readout and alarms. These versatile units may also be connected to an optional auxiliary indicator/annunciators for alerting personnel at remote locations. The user-friendly, digital design enhances setup and operation. These units may also be networked to a central PC-based station where data are logged and alarms posted.

This affordable and very flexible system has found its way into many applications resulting in a full complement of detectors, accessories, and options that include remote indicator alarms, printers, relay outputs, weather-proof enclosures, Ethernet networking software, industrial cameras, and more. See Options List.

Sites requiring centralization of their data can link multiple 375 systems together via Ethernet and view them using a common web browser with the purchase of Ludlum's Webpage & Service Software. This program collects all data in real time, logs data, and annuciates any alarms. The system can also send intelligent e-mail alerts to responsible personnel and capture a picture of whatever triggered an alarm anywhere optional Ethernet cameras are employed.

INDICATED USE: area monitoring
SUGGESTED DETECTORS: GM, proportional, scintillation, neutron
DISPLAY: four-digit LED display with 2 cm (0.8 in.) digits
DISPLAY RANGE: 000.0-9999
DISPLAY UNITS: can be made to display in μR/hr, mR/hr, R/hr, μSv/h, mSv/h, Sv/h, μrem/hr, mrem/hr, rem/hr, cpm, cps, and others
AUDIO: Intensity can very from approximately 68 dB to 100 dB through operation of the external rotary baffle and the internal voltage connection. Frequency is approximately 3 kHz
LINEARITY: reading within 10% of true value
RESPONSE: typically three seconds from 10%-90% of final reading
STATUS: green light, instrument functioning properly
Low Alarm: yellow light, 1 beep/second audible, selectable range: 0-9999
High Alarm: red light, 4 beeps/second audible, selectable range: 0-9999
Detector Fail: red light, constant audible tome > 68 dB at 61 cm (2 ft)
Low Bat: yellow light, indicates less than two hours of battery life remaining
HIGH VOLTAGE: adjustable from 200-2500 volts
THRESHOLD: adjustable from 2-100 mV
DEAD TIME: adjustable to compensate for dead time of detector and electronics (can be read on display)
OVERLOAD: senses detector saturation (indicated by display reading “-OL-”)
OVERRANGE: indicates radiation field being measured has exceeded counting range of instrument (indicated by display reading “– – – –”)
DATA OUTPUT: nine-pin connector providing five-decade logarithmic output, 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: a 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: wall mount aluminum housing with ivory powder coat paint
SIZE: 18.7 x 24.6 x 6.4 cm (7.4 x 9.7 x 2.5 in.) (H x W x D)
WEIGHT: 2.1 kg (4.7 lb)

Here is a list of some popular, pre-configured systems utilizing the Model 375 controller. Contact Ludlum to receive a quote for a system best meeting all your needs. We also offer a dual channel system.

Preconfigured Area Monitoring Systems

375/1 0.1 to 9999 uR/hr
375/2 0.1 mR/hr to 1.0 R/hr
375/4 1.0 mR/hr to 10 R/hr
375-9 0.1 mR/hr to 1,000 R/hr
375-10 1.0 uR/hr to 2,000 uR/hr

Preconfigured Gateway Monitoring Systems

375-20 Dual 5.1 x 5.1 cm (2 x 2 in.), NaI(Tl) 800 cpm/uR/hr
375-30 Dual 7.6 x 2.5 cm (3 x 1 in.), NaI(Tl) 1,200 cpm/uR/hr
375-600 Single 10320 cm-3 (630 in-3), PVT 30,000 cpm/uR/hr
375P-1000 Dual 7866 cm-3 (480 in-3), PVT 24,000 cpm/uR/hr

Preconfigured Waste Monitoring Systems
375-30 Dual 7.6 x 2.5 cm (3 x 1 in.), NaI(Tl) 1,200 cpm/uR/hr
375-32 Dual 7.6 x 2.5 cm (3 x 1 in.), NaI(Tl) 1,200 cpm/uR/hr
375-34 Four 7.6 x 2.5 cm (3 x 1 in.), NaI(Tl) 1,200 cpm/uR/hr
375P-336 Dual 2753 in-3 (168 in-3), PVT 12,000 cpm/uR/hr