Model 78-9

Stretch Scope Survey Meter

Part Number: 48-3808

Features

The Model 78-9 Stretch Scope telescoping beta-gamma survey meter allows the user to determine surface activity from a distance and reaches areas that are difficult to access with other hand probes. The detector employed is Ludlum's Model 44-9-21 and is removeable from the pole which extends out to 3.6 m (12 ft). A thumbscrew at the end of the pole firmly attaches the detector into place. 

The backlit digital LCD delivers precise 4-digit measurement values, which can be programmed to display units of cps or µSv/h, and is accompanied by icons and messages for operational status of the instrument. This instrument does not incorporate an analog meter as do many of the other Ludlum Model 78 series stretch scopes. The front-panel controls include separate switches for On/Off, Audio, cps/µSv/h, Fast/Slow response, and LCD backlight.

• Specifications
• Options
• Documents

• Specifications
• Options
• Documents

Specifications

Indicated Use	Beta-gamma survey with telescoping detector, 3.6 m (12 ft) fully extended
Detectors	Halogen-quenched GM pancake
Energy Response	Energy dependent (see Model 44-9)
Display	4-digit LCD display with 1.3 cm (0.5 in.) digits
Display Range	000.0 - 999.9 with indicators of cps and µSv/h
Backlight/Reset	Temporary action 2-position toggle switch to turn backlight on for preset time, or to zero meter and display
Audio	Built-in click-per-event audio with ON/OFF switch
Response	Dependent on number of counts present. Typical times: FAST 4 to 25 s, or SLOW 4 to 60 s, from 10% to 90% of final reading
Angular Response	Within 30% as detector is rotated from 0 to 90 degrees (calibration reference is with radiation field parallel to the long axis of the detector)
Geotropism	Referenced to the unit in horizontal position with the display up, the indication will not vary more than 2% of the full-scale reading with the unit in any other direction
Working Environment	Indoor/outdoor (splashproof shields for outdoor use), environmental rating IP 52
Temperature Range	-15 to 50 °C (5 to 122 °F) May be certified for -40 to 65 °C (-40 to 150 °F)
Power	2 "D" cell batteries (housed in sealed handle)
Battery Life	Typically 250 hours with alkaline batteries (low battery indicated on display)
Headphone Jack	Size 0.32 cm (1/8 inch)
Construction	Aluminum housing with beige powder coat paint, and polished stainless steel telescope assembly
Size (H x W x L)	18 x 10.1 x 114 cm retracted, 396.2 cm fully extended (7 x 4 x 45 in. retracted, 156 in. fully extended)
Weight	2.9 kg (6.4 lb), including batteries

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Options

Option	Description	Part Number
Model 78-Series Case	Rugged, watertight, crushproof, and dust proof transport and storage case.	4272-444

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Documents

• Data Sheet
• Product Manual (Model 78)
• Product Manual (Model 78-9 Addendum to Model 78)

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