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Summary of Contents for LUDLUM 5
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LUDLUM MODEL 5 GEIGER COUNTER May 2014 Serial Number 236626 and Succeeding Serial Numbers...
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LUDLUM MODEL 5 GEIGER COUNTER May 2014 Serial Number 236626 and Succeeding Serial Numbers...
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RETURN OF GOODS TO MANUFACTURER If equipment needs to be returned to Ludlum Measurements, Inc. for repair or calibration, please send to the address below. All shipments should include documentation containing return shipping address, customer name, telephone number, description of service requested, and all other necessary information.
Batteries Troubleshooting Troubleshooting Electronics which utilize GM Detectors Troubleshooting GM Detectors Recycling Parts List Model 5 Geiger Counter Main Board, Drawing 464 × 272 HV Power Supply Board, Drawing 464 × 249 Drawings and Diagrams Ludlum Measurements, Inc. May 2014...
Technical Manual Section 1 Section Introduction he Model 5 is a self-contained portable Geiger Counter with two internal Geiger-Mueller (GM) tubes and five linear ranges used in combination with exposure rate or meter dials. The first three ranges use an LND 71210 (or equivalent), while the lower two ranges use an LND 71412 (or equivalent).
(batteries, cable, etc.) and ensure that all of the items listed on the packing list are in the carton. Check individual item serial numbers and ensure calibration certificates match. The Model 5 serial number is located on the front panel below the battery compartment.
Reading the Meter Face Dial Reading the meter face is very important for consistent measurements. The Model 5 typically has an exposure rate 0-2.0 mR/hr meter face. The following examples are intended to help the user interpret the correct reading.
BAT OK If the needle is pointing as indicated above and the instrument range selection switch is on the ×0.1 scale multiple, then the reading is 1.5 mR/hr (multiplied by) ×0.1 = .00015 R/hr. The same needle indications on successive ranges would be: ×1 = 1.5 mR/hr (or .0015 R/hr)
: within 15% of true value from 60 keV - 3 MeV Energy Response : in excess of 1000 R/hr Saturation : 6.4 cm (2.5 inch) arc, 1 mA, pivot-and-jewel suspension Meter : 0-2 mR/hr, (others available) Meter Dial...
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-20 to 50 ˚C (-4 to 122 ˚F) Temperature Range: : 24.1 x 8.9 x 21.6 cm (9.5 x 3.5 x 8.5 inch) (H x W x L), including Size instrument handle : 2 kg (4.4 lb) including batteries and detectors Weight : cast and drawn aluminum with beige powder-coating.
Section 4 Section Identification of Controls and Functions Meter : 6.4cm (2.5 inch) arc, 1 mA analog type with pivot-and-jewel suspension. Typical meter dial is 0-2 mR/hr and BAT TEST Range Selector Switch : A six-position switch marked , ×1000, ×100, ×10, ×1, ×0.1.
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Model 5 Geiger Counter Technical Manual Section 4 : Provides meter response. Selecting the fast, ˝ F-S Toggle Switch ˝ position, of the toggle switch provides 90% of full-scale meter deflection in four seconds. In the slow, ˝ ˝ position, 90% of full-scale meter deflection takes 22 seconds.
The operator or responsible body is cautioned that the protection provided by the equipment may be impaired if the equipment is used in a manner not specified by Ludlum Measurements, Inc. The Model 5 Geiger Counter is marked with the following symbols: CAUTION (per ISO 3864, No.
European Union. Cleaning and Maintenance Precautions The Model 5 may be cleaned externally with a damp cloth, using only water as the wetting agent. Do not immerse the instrument in any liquid. Observe the following precautions when cleaning or performing maintenance on the instrument: 1.
Maintenance Instrument maintenance consists of keeping the instrument clean and periodically checking the batteries and the calibration. The Model 5 instrument may be cleaned with a damp cloth (using only water as the wetting agent). Do not immerse instrument in any liquid. Observe the following precautions when cleaning: 1.
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Model 5 Geiger Counter Technical Manual Section 6 must be scraped off and/or washed using a paste solution made from baking soda and water. Use a spanner wrench to unscrew the battery contact insulators, exposing the internal contacts and battery springs. Removal of the handle will facilitate access to these contacts.
(1) sticky meters, (2) battery contacts. Note that the first troubleshooting tip is for determining whether the problem is with the electronics or with the detector. A Ludlum Model 500 Pulser is invaluable at this point, because of its ability to simultaneously check high voltage, input sensitivity or threshold, and the electronics for proper counting.
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Model 5 Geiger Counter Technical Manual Section 7 SYMPTOM POSSIBLE SOLUTION Nonlinear Readings Check the high voltage ( ) using a Ludlum Model 500 Pulser (or equivalent). If a multimeter is used to check the , ensure that one with...
If damage is evident, the tube must be replaced. 2. Check the . For most GM tubes, the voltage is normally 900 Vdc, or 460-550 Vdc for “peanut” tubes (Ludlum Model 133 series). 3. Wires to the tube may be broken or the crimped connector could have a loose wire.
To this end, Ludlum Measurements, Inc. strives to supply the consumer of its goods with information regarding reuse and recycling of the many different types of materials used in its products. With many different agencies - public and private - involved in this pursuit, it becomes evident that a myriad of methods can be used in the process of recycling.
Model 5 Geiger Counter Technical Manual Section 9 Section Parts List Reference Description Part Number Model 5 Geiger UNIT Completely Assembled Counter Model 5 Geiger Counter 48-1607 Main Board, BOARD Main Circuit Board 5464-272 Drawing 464 × 272 CAPACITORS 470pF, 100V 04-5668 0.1µF, 35V-T...
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Do you have a question about the 5 and is the answer not in the manual?
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