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Specifications
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GTMB Detector
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Type
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Single, high temperature, halogen-quenched Geiger-Mueller tube operated at reduced voltage†
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Electrical Connections
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Field cable connections made on 600 volt terminal block; Detector to come complete with wire lugs for terminations
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Radiation Field Requirement
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Approximately 0.1mR/Hr at the detector
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Reproduceability Level
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+0.25 in.
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Ambient Temperature
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-40°C to +93°C (-40°F to +200°F)
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Process Temperature
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Unlimited
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Power Requirements
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None
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Enclosure
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NEMA 4 housing supplied with conduit clamps for mounting; For explosion-proof model, consult Thermo Fisher Scientific
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Physical Dimensions
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1.53D x 5.25W x 11 in.H (3.88 x 13.3 x 27.9cm) (L-shaped)
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Weight
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Approximately 3 lb. (1.4kg)
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Mounting
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Three-point bolting system (no welding or cutting of hopper's thermal insulation)
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Microprocessor-Indicator Unit
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Detector
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M-I unit for monitoring
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Capacity
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1 to 64 detectors
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Response Time
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1 sec to 255 sec
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Readout
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64 pairs of lights; Indications for Full Hopper, Not Full Hopper, Excessive Fly Ash Build-up on Hopper Walls or Detector Failure
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Alarms
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Two sets of SPDT contacts rated 15 A, 230 VAC; One set is reset by acknowledge button, the other resets only on the absence of the alarm condition
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Alarm Conditions
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Full hopper or detector failure
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Enclosure Rating
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NEMA 4
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Physical Dimensions (D x W x H)
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12.75 x 20 x 26.5 in. (32.4 x 50.8 x 67.3cm); Mounting holes on 25.25 x 14 in. (64.1 x 35.6cm)
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Weight
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80 lb. (37kg)
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Ambient Temperature
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+28°C to +60°C (-20°F to +140°F)
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Power Required
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115VAC +10%, 60Hz, 340VA; 230VAC available (consult Thermo Fisher)
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Cable Required
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RG58A/U for temperature up to +80°C (+175°F); RG188A/U for high temperature cable up to +210°C (+394°F); Maximum cable run of 1000 feet from M-I to any detector
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Interface Outputs
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Hopper status information available on TTL compatible outputs for custom displays or computer interfacing; Each output capable of driving 10 standard TTL loads; Optional outputs: solid state relays, mechanical relays or multi-plexed system
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Special Features
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Continuous check for detector failure; Built-in diagnostic tests; Early warning of fly ash build-up on hopper walls
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Source and 5197 Source Heads
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Source Material
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Double-encapsulated Cesium 137
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Source Size
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5 to 200 mCi, depending on hopper size
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Head Construction
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Lead filled, steel-encased with special dual-beam ports; Adaptable to Kirk or Superior key interlocks; Remote actuator supplied for mechanical operation
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Head Weight
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Approximately 35 lb. (16kg)
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Mechanical Safety
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Source is spring loaded to return to its "off" position if the source actuator cable fails
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Mounting
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Three configurations (no field welding or cutting of lagging or thermal insulation):
V-Mount: a vertical mounting for dual-beam source heads that bolts to the lower flange of the hopper support beam
H-Mount: a horizontal uni-strut lagging bolt system for dual-beam source heads that is used when the hopper
support beam is inaccessible
L-Mount: a uni-strut channel system for single-beam source heads that stiffens the aluminum lagging for better
distribution of the source head weight
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†The operating life of the Geiger-Mueller tube is extended by operating the tube in the lowest possible radiation field, thereby reducing the number of counts emitted.
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