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Summary of Contents for Ludlum Measurements 240 Series
- Page 1 LUDLUM MODEL 240 SERIES FLOOR AND WALL MONITOR USER’S MANUAL October 2020...
- Page 2 LUDLUM MODEL 240 SERIES FLOOR AND WALL MONITOR USER’S MANUAL October 2020...
- Page 3 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.
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Page 4: Table Of Contents
User’s Manual Model 240 Series Table of Contents Introduction Getting Started Unpacking and Repacking Gas Bottle Installation Specifications Operating Procedures Maintenance Gas Proportional Detectors Scintillation Detectors Safety Considerations Environmental Conditions for Normal Use Warning Markings and Symbols Cleaning and Maintenance Precautions... -
Page 5: Introduction
User’s Manual Model 240 Series Section 1 Section Introduction he Model 240 Alpha-Beta Floor and Wall Monitor allows a user to quickly survey large areas for alpha-beta contamination. Compatible with either gas-proportional or scintillation detectors, the Model 240 cart comes in a version that supports both floor and wall monitoring or a floor-style only version. - Page 6 Shown above is the counting screen, which is displayed on the provided Toughbook ® laptop computer. The versatile Model 240 Series offers several different combinations for a variety of uses. The following is a list of possible models: Ludlum Measurements, Inc.
- Page 7 User’s Manual Model 240 Series Section 1 Model 240 Floor and Wall Monitor (part # 48-3956): includes 12 Model 43-198 gas proportional 126 cm detectors; Toughbook® laptop; gas regulator, input, output, and space (purge) flowmeter (no P-10 gas bottle provided).
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Page 8: Getting Started
User’s Manual Model 240 Series Section 2 Section Getting Started Unpacking and Repacking Remove the calibration certificate and place it in a secure location. Remove the instrument and ensure that all of the items listed on the packing list are in the carton. - Page 9 User’s Manual Model 240 Series Section 2 Remove the existing nut from the fitting on the regulator. Insert one end of the vinyl tubing into one of the plastic nuts and screw the nut onto the fitting. Finger tight is sufficient.
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Page 10: Specifications
User’s Manual Model 240 Series Section 3 Section Specifications Detectors: up to 12 gas proportional or ZnS-plastic scintillation Detector Height: adjustable from 0.48 to 2.2 cm (0.19 to 0.88 in.) from surface to detector metallized polyester Detector High Voltage: adjustable from 0 to 2300 Vdc Detector Alpha-Beta Thresholds: adjustable from 5 to 330 mVdc Maximum Wall Height: 262 cm (103 in.) - Page 11 User’s Manual Model 240 Series Section 3 Detector Connectors: Series “C” type is default, others available Temperature Range: -15 to 50 °C (5 to 122 °F) Maximum Gas Cylinder Size: 22.9 x 66 cm (9 x 26 in.) (Dia x H); 17.0 L (0.60...
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Page 12: Operating Procedures
User’s Manual Model 240 Series Section 4 Section Operating Procedures Note: Operators of the Model 240S, using scintillation detectors, can skip the steps below involving the gas or gas flow. Caution!: If the output has a quick-connect fitting, insert a male quick- connect prior to applying the gas supply. - Page 13 User’s Manual Model 240 Series Section 4 Connect the detector to the counting instrument. High voltage is preset at the factory to read alpha and beta. Background count will read approximately 1000-1400 cpm. Adjust the height of the detector for optimum performance.
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Page 14: Maintenance
User’s Manual Model 240 Series Section 5 Section Maintenance Periodic maintenance consists of checking the general condition of the detectors, gas tubing/fittings (if used), signal/high-voltage cable, and the detector windows. Malfunction of the detectors could be caused by a broken metallized polyester window, a broken photomultiplier tube (PMT), or a broken high-voltage wire inside the detector. -
Page 15: Safety Considerations
User’s Manual Model 240 Series Section 6 Section Safety Considerations Environmental Conditions for Normal Use Indoor or outdoor use (While rain resistant, user is cautioned to avoid getting water through detector openings.) No maximum altitude Temperature Range: -15 to 50 °C (5 to 122 °F) -
Page 16: Cleaning And Maintenance Precautions
User’s Manual Model 240 Series Section 6 The “crossed-out wheelie bin” symbol notifies the consumer that the product is not to be mixed with unsorted municipal waste when discarding. Each material must be separated. The symbol is placed on the label located on the side panel. -
Page 17: Recycling
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. - Page 18 User’s Manual Model 240 Series Section 8 Section Drawings Model 240 Dimensions, Drawing 304 x 193K Model 240S Dimensions, Drawing 304 x 300F Model 240-1 Dimensions, Drawing 304 x 279 Model 240-1S Dimensions, Drawing 304 x 306 Ludlum Measurements, Inc.
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