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Ludlum Measurements 43-68 Manual

Gas proportional detectors
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LUDLUM MODEL 43-68,
43-68/1 AND 43-68/2
GAS PROPORTIONAL DETECTORS
February 2011
Serial Number 159017 and Succeeding
Serial Numbers

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Summary of Contents for Ludlum Measurements 43-68

  • Page 1 LUDLUM MODEL 43-68, 43-68/1 AND 43-68/2 GAS PROPORTIONAL DETECTORS February 2011 Serial Number 159017 and Succeeding Serial Numbers...
  • Page 3 LUDLUM MODEL 43-68, 43-68/1 AND 43-68/2 GAS PROPORTIONAL DETECTORS February 2011 Serial Number 159017 and Succeeding Serial Numbers LUDLUM MEASUREMENTS, INC. 501 OAK STREET, P.O. BOX 810 SWEETWATER, TEXAS 79556 325-235-5494, FAX: 325-235-4672...
  • Page 5 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.

  • Page 6: Table Of Contents

    Model 43-68, 43-68/1, 43-68/2 Gas Proportional Detector Table of Contents General Specifications Hook-Up Flush Detector Performance Static Operation Recharge Parts List Drawings and Diagrams Ludlum Measurements, Inc. February 2011...

  • Page 7: General

    Both the Model 43-68 and Model 43-68/1 have the two fittings “topside.” The Model 43-68 fittings are on the same end as the cable connector, while the Model 43-68/1 has fittings on opposite corners. The Model 43-68/2 fittings are on the narrow side of the end of the detector opposite the handle.

  • Page 8: Specifications

    Model 43-68, 43-68/1, 43-68/2 Gas Proportional Detector Specifications typically two layers of Mylar 0.8 mg/cm Window Thickness: other thicknesses available : typically 126 cm active, 100 cm open Window Area : P-10 (10% methane, 90% argon) is Counting recommended. Other counting gases are also acceptable.
  • Page 9 Model 43-68, 43-68/1, 43-68/2 Gas Proportional Detector Operating Voltage: • Alpha is typically 1100-1400 volts. • Beta-gamma is typically 1600-1800 volts. typically 2-5 mV for scaler or Counter Threshold Setting: gross counting instrument : 7.4 x 11.7 x 19.8 cm (2.9 x 4.6 x 7.8 in.) (H x W x L) Size : 0.9 kg (2 lb)

  • Page 10: Hook-Up

    Model 43-68, 43-68/1, 43-68/2 Gas Proportional Detector Hook-Up NOTE: Plastic dust caps should always be in place on detector gas connectors when gas lines are disconnected, except during a fast flush. Dust caps prevent dust and other materials from interfering with the function of the check valves and should be in place when the detector is operating on a static charge.

  • Page 11: Flush

    Model 43-68, 43-68/1, 43-68/2 Gas Proportional Detector Flush CAUTION: The Model 43-68 uses double-end shut-off quick connects. Both the male and female quick connects have to be connected to allow counting gas to flow through the detector.  Connect output gas line from detector to output flowmeter.

  • Page 12: Detector Performance

    Model 43-68, 43-68/1, 43-68/2 Gas Proportional Detector Detector Performance ALPHA PLATEAU: Determine the plateau region of the background and alpha source counting curves for the applied voltage range of 1100-1400 volts. Use 50-volt increments and set the counting instrument input sensitivity at 4 mV. The operating voltage should be approximately 1250 volts.

  • Page 13: Recharge

    Model 43-68, 43-68/1, 43-68/2 Gas Proportional Detector  Turn main supply to OFF.  Check source count before and after static operation. A decrease in detector efficiency should be less than 10% in 15 hours from when the detector is disconnected from the main gas supply for gross counting or 5 hours for alpha- beta counting.

  • Page 14: Parts List

    Model 43-68, 43-68/1, 43-68/2 Gas Proportional Detector Parts List Description Part Number Completely Assembled 47-2005 Model 43-68 Gas Probe Completely Assembled 47-2013 Model 43-68/1 Gas Probe Completely Assembled 47-2017 Model 43-68/2 Gas Probe Body – Model 43-68 7342-152 Body – Model 43-68/1 7342-161 Body –...

  • Page 15: Drawings And Diagrams

    Model 43-68, 43-68/1, 43-68/2 Gas Proportional Detector Drawings and Diagrams Assembly View (Model 43-68), Drawing 342 x 97 Assembly View (Model 43-68), Drawing 339 x 70 Assembly View (Model 43-68/1), Drawing 339 x105 Assembly View (Model 43-68/2), Drawing 339 x 104 Page 9 Ludlum Measurements, Inc.
  • Page 16 Model 43-68, 43-68/1, 43-68/2 Gas Proportional Detector Page 10 Ludlum Measurements, Inc. February 2011...
  • Page 17 Model 43-68, 43-68/1, 43-68/2 Gas Proportional Detector Page 11 Ludlum Measurements, Inc. February 2011...
  • Page 18 Model 43-68, 43-68/1, 43-68/2 Gas Proportional Detector Page 12 Ludlum Measurements, Inc. February 2011...
  • Page 19 Model 43-68, 43-68/1, 43-68/2 Gas Proportional Detector Page 13 Ludlum Measurements, Inc. February 2011...

This manual is also suitable for:

43-68/143-68/2159017

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