LUDLUM 2363 Manual
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LUDLUM 2363 Manual

Gamma-neutron survey meter
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LUDLUM MODEL 2363
GAMMA-NEUTRON SURVEY METER
October
2015
Serial Number 220855 and Succeeding
Serial Numbers

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Summary of Contents for LUDLUM 2363

  • Page 1 LUDLUM MODEL 2363 GAMMA-NEUTRON SURVEY METER October 2015 Serial Number 220855 and Succeeding Serial Numbers...
  • Page 2 LUDLUM MODEL 2363 GAMMA-NEUTRON SURVEY METER January October 2015 Serial Number 220855 and Succeeding Serial Numbers...

  • Page 3: Table Of Contents

    Cleaning Instructions and Precautions Warning Markings and Symbols Calibration and Maintenance Calibration Meter Calibration Establishing an Operating Point Maintenance Recalibration Batteries RS-232 Interface Communicating With the Model 2363 Commands Read Commands Set Commands Command Descriptions Ludlum Measurements, Inc. January 2015...
  • Page 4 Technical Manual Model 2363 Interface Software Functions Main Screen Auto Dump Data 7-10 Installation of the 2363 Interface Software 7-14 Removal of the Model 2363 Interface V2 7-14 Connecting to a Computer 7-14 Technical Theory of Operation Troubleshooting Recycling Parts List...

  • Page 5: Introduction

    The display is direct-driven for optimal viewing and wide temperature response. The Model 2363 range selector switch allows for multiplication ranges of ×0.1, ×1, ×10, and ×100, and a front-panel three-position toggle switch is used for selecting display of neutron, gamma, or neutron + gamma levels.
  • Page 6 RESET INTEGRATED DOSE The Model 2363 communicates through an RS-232 port located on the instrument can. The computer interface software is supplied on CD and includes the following functions:  Downloading of header and logged data into an ASCII file ...

  • Page 7: Getting Started

    The Model 2363 serial number is located on the front panel below the battery compartment. Most Ludlum Measurements, Inc. detectors have a label on the base or body of the detector for model and serial number identification.

  • Page 8: Connecting A Detector To The Instrument

    ) is supplied to the detector via the detector input connector. A mild electric shock may occur if you make contact with the center pin of the input connector. Switch the Model 2363 to the position before connecting or disconnecting the cable or detector.

  • Page 9: Operating The Instrument

    Model 2363 Technical Manual Section 2 Operating the Instrument Connect a detector to the instrument if you have not already done so. Obtain a meter reading from a check source or calibrated source, if available. Verify that the reading falls within the expected range. Remove the source. If a radiation source is available, increase the meter count to exceed the alarm threshold.

  • Page 10: Specifications

    Model 2363 Technical Manual Section 3 Section Specifications : four linear range multiples of ×0.1, ×1, ×10, and ×100; used in Ranges combination with the 0-10 mrem/hr meter dial, providing an overall range of 0-1000 mrem/hr Gamma Energy Range : 60 keV to 3 MeV Gamma Energy Response : ≤...
  • Page 11 Model 2363 Technical Manual Section 3 Alarm points : four separate alarms set through the RS-232 port, activating the alarm audio tone and lighting the appropriate LEDs; marked , or . The four alarm points can be set GALARM NALARM...

  • Page 12: Description Of Controls And Functions

    Model 2363 Technical Manual Section 4 Section Description of Controls and Functions Operator Controls (or Range Selector Switch): a six- OFF/BAT/X100/X10/X1/X0.1 Switch position rotary switch to select the analog meter range multipliers and check the battery status. When switched to the ˝...

  • Page 13: Internal Controls

    The date is entered in Month/Day/Year format. During power-up the Model 2363 checks to see if the current date is past the calibration due date. If it is, then the Model 2363 displays ˝ ˝...
  • Page 14 Model 2363 Technical Manual Section 4 the only audible tones in the ˝ ˝ channel selection, and gamma pulse tones are the only audible tones in the ˝ ˝ channel selection. SWITCH 2 TONE MODE DUAL SINGLE : This switch, when placed in the...

  • Page 15: Safety Considerations

    This is typical of industrial or construction sites.) Cleaning Instructions and Precautions The Model 2363 Gamma-Neutron Survey Meter 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: 1.

  • Page 16: Warning Markings And Symbols

    Ludlum Measurements, Inc. The Model 2363 Gamma-Neutron Survey Meter is marked with the following symbols: CAUTION (per ISO 3864, No. B.3.1): designates hazardous live voltage and risk of electric shock.

  • Page 17: Calibration And Maintenance

    Local procedures may supersede the following. Meter Calibration A Ludlum Model 500 Pulser or equivalent is required. If the pulser does not have high-voltage readout, use a-high impedance voltmeter with at least 1000 megohm input resistance to measure the detector voltage.

  • Page 18: Establishing An Operating Point

    1. Using the Ludlum Model 500 pulser or equivalent, adjust the neutron threshold (NTHR) of the Model 2363 to -10 mV and set the HV (NHV) to 635 Vdc. 2. Connect the Model 42-41 PRESCILA to the Model 2363 with a 0.99 m (39 in.) cable.

  • Page 19: Maintenance

    Maintenance Instrument maintenance consists of keeping the instrument clean and periodically checking the batteries and the calibration. The Model 2363 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.

  • Page 20: Batteries

    Check the appropriate regulations to determine required recalibration intervals. Ludlum Measurements offers a full-service repair and calibration department. We not only repair and calibrate our own instruments but most other manufacturers’ instruments. Calibration procedures are available upon request for customers who choose to calibrate their own instruments.

  • Page 21: Rs-232 Interface

    Section 7 Section RS-232 Interface Communicating with the Model 2363 The Model 2363 has an RS-232 serial port that can be connected to a PC or other RS-232 device. The proper communication settings are (38400,8,N,1): 38400 Baud 8 data bits...

  • Page 22: Set Commands

    [CR][LF] 0001 This command reads the calibration date. During power up the Model 2363 checks the current date against this date. If the current date is past the calibration date, the message “OUTCAL” is displayed and the Model 2363 is disabled until the calibration date is changed ahead of the current date.
  • Page 23 Model 2363 Technical Manual Section 7 This command reads the current date and time. The output is 21 characters including a [CR] and [LF]. The format is : HH:MM:SS MM/DD/YYYY 16:16:29 11/20/1996[CR][LF] This command reads the specified efficiency calibration constant...
  • Page 24 Day Year format.” During power-up the Model 2363 checks to see if the current date is past the calibration due date. If it is, then the Model 2363 displays “OUTCAL” and is disabled until this command is issued to set the Ludlum Measurements, Inc.
  • Page 25 Model 2363 Technical Manual Section 7 calibration date ahead of the current date. The length of the command is 12 characters, including a [CR] and [LF]. The format is: SC11201997[CR][LF] Sdmmddyyyyz This command sets the current date. The date is entered in “Month Day Year”...
  • Page 26 Model 2363 Technical Manual Section 7 This command sets the specified header. The variable “x” can be any number between 1 and 6. The variable “y” can be up to 15 characters. The length of the command is 20 characters, including a [CR] and [LF].
  • Page 27 14 characters, including a [CR] and [LF]. The format is: SLTABLE007[CR][LF] This command disables or enables the automatic dumping of the rate meter when the Model 2363 is set not to log samples. SpecifingSpecifying SM0 will disable the rate meter, dumping until the unit is turned off or the command SM1 is issued.
  • Page 28 Model 2363 Technical Manual Section 7 This command resets the sample number to one, which will effectively erase all samples stored in memory. Use this command with caution. The format is: SR[CR][LF] SThhmm This command sets the current time in military format. Military time is as...

  • Page 29: Model 2363 Interface Software

    Once found, it will download all data from the Model 2363, which includes Headers and Logged Data. The user is able to change any parameter and update the Model 2363, make hard copies, or save data to an ASCII file for later import in word processors, spreadsheets, or other applications.
  • Page 30 Model 2363 Technical Manual Section 7 The data will be lost if the logged data has not been previously saved. Ludlum Measurements, Inc. Page 7- January 2015...
  • Page 31 Model 2363 Technical Manual Section 7 [Reload All Data]—downloads all information from the Model 2363. If there are logged samples, the user is prompted to download them after all the parameters have been retrieved. [Load Defaults]—reloads all header data to the original state as shipped from LMI.

  • Page 32: Auto Dump Data

    The auto dump data screen allows the user to capture real-time data coming from the Model 2363. The Model 2363 outputs the data every two seconds, which is captured and recorded to the grid. After capturing the data it, may be saved to a file or printed to the default printer.
  • Page 33 If there is no data displayed, only the header information will be printed. [Close]—Return to main menu area. 2363 Interface Software ASCII Files and Printout Table 1: logged data downloaded from the Model 2363 and saved to an ASCII file Table 2: real-time logged data saved to an ASCII file Table 3: printout of header and log data information Ludlum Measurements, Inc.
  • Page 34 Model 2363 Technical Manual Section 7 Table 1: Sample File: LogData.log Neutron and Gamma counts are in mrem/hr. Integrated Dose counts are in mrem. S=Scaler, R=Rate meter, C=CPM, D=Dose Integrated Sample # Date Time Neutron Gamma Dose Location -------- ----------...
  • Page 35 Header 5: RM 008, S. Wall Header 6: Location: Table 007 Calibration Due Date: 12/12/2006 Model 2363 Date: 12/19/2005 Model 2363 Time: 01:46:13 PM Logged Samples: Paralyzed Time: 100 µSeconds Time Constant Setpoint: Current Neutron Time Constant: Current Gamma Time Constant: Neutron Alarm Setpoint: 1000.00 mrem/hr...

  • Page 36: Installation Of The 2363 Interface Software

    The uninstall screen appears, and the program removal will be complete. Connecting to a Computer Using the supplied cable, connect the end with the female connector to the Model 2363 and the other end to a free COM port on your computer. The pinouts of the cables are as...

  • Page 37: Technical Theory Of Operation

    Model 2363 Technical Manual Section 8 Section Technical Theory of Operation Gamma Transistor pairs, U9 and U10, form the charge sensitive amplifier. U13, comparator with 0.23 Vdc threshold, produces negative-going 5-volt pulses for every valid gamma pulse. One-shot, U15A provides single pulses for each...

  • Page 38: Troubleshooting

    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 can be invaluable at this point, because of its ability to simultaneously check high voltage, input sensitivity or threshold, and the electronics for proper counting.
  • Page 39 Nonlinear Readings Check the high voltage ( ) by using a Ludlum Model 500 Pulser (or equivalent). If a multimeter is used to check the , ensure that one with high impedance is used, as a standard multimeter could be damaged in this process.
  • Page 40 Model 2363 Technical Manual Section 9 SYMPTOM POSSIBLE SOLUTION Meter goes full scale Open the instrument can, and check or “pegs out” for loose wires. (continued) Ensure that the instrument’s can is properly attached. When attached properly, the speaker will be located on the left side of the instrument.

  • Page 41: 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 42: Parts List

    Section 11 Section Parts List Reference Description Part Number Model 2363 UNIT Completely Assembled Gamma-Neutron Survey Meter Model 2363 Gamma-Neutron Survey Meter 48-3501 BOARD Completely Assembled Processor Board, Processor Board 5390-295 Drawing 390 × 295 DETECTOR LND 71210, GM DET...
  • Page 43 Model 2363 Technical Manual Section 11 Reference Description Part Number 10µF, 25V 04-5728 C53-C54 220pF, 100V 04-5674 10µF, 25V 04-5728 C56-C59 0.01µF, 50V 04-5741 TRANSISTORS Q1-Q5 2N7002L 05-5840 Q6-Q8 MMBT3904LT1 05-5841 INTEGRATED 24LC515ISM 06-6570 CIRCUITS DS1621S 06-6565 MAX220CSE 06-6329 MAX810LEUR...
  • Page 44 Model 2363 Technical Manual Section 11 Reference Description Part Number 7.5K, 1/8W, 1% 12-7847 R23-R25 1M, 1/4W, 1% 12-7844 100K, 1/4W, 1% 12-7834 2.21K, 1/4W, 1% 12-7835 301 Ohm, 1/4W, 1% 12-7863 2.37K, 1/4W, 1% 12-7861 R30-R34 100K, 1/4W, 1%...
  • Page 45 Model 2363 Technical Manual Section 11 Reference Description Part Number LED Board, BOARD Completely Assembled Drawing 390 × 299 LED Board 5390-299 DIODES DS1-DS3 E176 LED-0.2X0.1 07-6494 RESISTORS R1-R3 470 Ohm, 1/4W, 5% 10-7008 CONNECTOR 640456-4, MTA100x4 13-8088 LCD Display Board, Drawing 390 ×...
  • Page 46 ON CAN, TINI #42 21-9333 TYPE SELECT READ INT. DOSE MISCELLANEOUS Meter Assembly 4390-303 MODEL 2363 Interface Software 1370-072 Model 2363 Meter Face 7390-294 Model 42-41 Probe Sleeve Assy. 4390-321 Model 2241-2 RLLD Handle Assy. 4408-178 Ludlum Measurements, Inc. Page 11-5...

  • Page 47: Led Board, Drawing 390 × 299

    Model 2363 Technical Manual Section 12 Section Drawings PROCESSOR BOARD, Drawing 390 × 295 (4 sheets) PROCESSOR BOARD COMPONENT LAYOUT, Drawing 390 × 296 (2 sheets) LCD DISPLAY BOARD, Drawing 390 × 170 LCD DISPLAY BOARD COMPONENT LAYOUT, Drawing 390 × 171 (2 sheets) LED BOARD, Drawing 390 ×...

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