Protecting steel mills against entry of loose radiation sources that can potentially contaminate it and costs millions in clean-up require diligent attention and caution. Ludlum's conveyor monitor offers added assurance by inserting a second line of defense. Gateway monitors employed at the entrance to most facilities used to scan trucks and vehicles, represent the first line of defense. These gateway systems are highly effective and catch loose sources before they enter your site. As any radiation detection expert knows, despite their effectiveness, they can be stretched to the limit of their ability whenever called upon to detect weaker sources deeply embedded and highly shielded in the middle of a large load. The conveyor radiation monitor has a huge advantage over gateway systems in that it allows the radiation detector to be exposed a few inches, not feet, from each piece of scrap while traveling under highly controlled conditions. This type of a scan offers an optimum geometry and enhances detecting even weaker sources with much greater probability. The likelihood of escaping detection at this secondary process becomes highly remote and is a very small price to pay for detecting any sources which may have escaped attention at the entry point.

 

Ludlum's Model 375P-3500 Conveyor Radiation Detection System employs its standard Model 3500 scintillator detector which is identical to that used in its popular gateway systems. This detector delivers superior sensitivity while supplying commonality of parts and operation familiarity. To reduce costs without compromising performance, the 375P-3500 system also utilizes Ludlum's highly popular Model 375 type controller that controls the detector, updates background, and carefully monitors the scrap metal passing by. The controller can operate totally independently or be wired for remote annunciation or connected to an Ethernet network. The system includes 1 ea. Model 375P electronics, 1 ea. 3500 in³ (57.4 L) plastic detector with 15.2 m (50 ft) cable, 1 ea. 10 μCi check source.

 

 

RADIATION DETECTOR: 1 ea. 3500 in³ (57.4 liters) plastic scintillation detectors with 0.125 in. (0.32 cm) lead shielding in weathertight housing

DISPLAY: 4-digit LED display with 0.8 in. (2 cm) digits

RANGE: 0.1-9999 kcps

LINEARITY: reading within 10% of true value with detector connected

RESPONSE: typically 3 seconds from 10%-90% of final reading

STATUS: (green light) instrument functioning properly

SIGMA ALARM: indicated by red ALARM light and audible tone (can be set from 0.0-9999 kcps)

SUM ALARM: indicated by red ALARM light and audible tone (can be set from 0.0-9999 kcps)

Note: audible alarm indicators can be configured as a single beep if desired.

DET FAIL: (red light and audible tone; greater than 68 dB at 2 ft [60.9 cm]) indicates detector overload, no count from detector, or instrument failure

LOW BAT: (yellow) indicates less than 2 hours of battery power remaining

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 “——” )

RELAY OUTPUT: mains (120 or 280 Vac) output on alarm

DATA OUTPUT: 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: 95-135 Vac (178-240 Vac available ), 50-60 Hz single phase (less than 100 mA ), 6-volt sealed lead-acid rechargeable battery (built in)

BATTERY LIFE: typically 24 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: stainless steel enclosure with aluminum door, with white powder-coat finish

TEMPERATURE RANGE: 5 to 122 °F (-15 to 50 °C), may be certified from -40 to 150 °F (-40 to 65°C)

SIZE: electronics: 10.3 x 9.7 x 3.3 in. (26.2 x 24.6 x 3.3 cm) (H x W x D); detector: 82 x 24.5 x 9 in. (208 x 62 x 23 cm) (H x W x D)

WEIGHT: electronics: 9.3 lb (4.2 kg); detector: 650 lb (295 kg)

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