Ludlum Measurements 375-9 Manual
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Ludlum Measurements 375-9 Manual

Digital wall-mount area monitor with models 45-9 & 45-9-1 ion chambers
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LUDLUM MODEL 375-9
DIGITAL WALL-MOUNT AREA MONITOR
WITH MODELS 45-9 & 45-9-1 ION CHAMBERS
July 2016
Serial Number 230666 and Succeeding
Serial Numbers

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Summary of Contents for Ludlum Measurements 375-9

  • Page 1 LUDLUM MODEL 375-9 DIGITAL WALL-MOUNT AREA MONITOR WITH MODELS 45-9 & 45-9-1 ION CHAMBERS July 2016 Serial Number 230666 and Succeeding Serial Numbers...
  • Page 2 LUDLUM MODEL 375-9 DIGITAL WALL-MOUNT AREA MONITOR WITH MODELS 45-9 & 45-9-1 ION CHAMBERS July 2016 Serial Number 230666 and Succeeding Serial Numbers...

  • Page 4: Table Of Contents

    Time and Date Stamp Option Relay Options 4 to 20 mA Isolated Output Driver Option Safety Considerations Environmental Conditions for Normal Use Cleaning Instructions and Precautions Warning Markings and Symbols Replacement of Main Fuse Battery Replacement Ludlum Measurements, Inc. July 2016...
  • Page 5 Battery Charge Detector Calibration Detector Electronics Checkout Recycling Parts List Model 375-9 Digital Wall-Mount Area Monitor Main Board, Drawing 396 × 608 Wiring Diagram, Drawing 396 × 869 Model 45-9 Remote Area Monitor Model 45-9-1 Remote Area Monitor Remote Electrometer, Drawing 280 × 219 Drawings and Diagrams Ludlum Measurements, Inc.

  • Page 6: Introduction

    Model 375-9 Digital Wall-Mount Area Monitor is designed for visibility and ease of use. Featuring a wall-mount chassis, the Model 375-9 has a four-digit LED display that is readable from thirty feet away. Backlit indicators warn of low radiation alarm (yellow), high radiation alarm (red), instrument failure (red) and low battery (yellow).
  • Page 7 Two common Model 375-9 systems with external detector are: The Model 375-9 with Model 45-9 Ion Chamber The Model 375-9 with Model 45-9-1 Ion Chamber Both detectors utilize a stainless steel pressurized ion chamber with lead shielding for energy compensation. An energy response curve is provided in the back of this manual for quick reference.

  • Page 8: Getting Started

    This section of the manual is designed to help the first- time user get started. Initial power-up and basic features of the Model 375-9 will be discussed in this section. Other sections of the manual provide more detailed information.

  • Page 9: Connecting The Detector

    Section 2 Connecting the Detector The Model 375-9 comes equipped with either a Model 45-9 or 45-9-1 Ion Chamber (detector). The instrument detector connector is located on the bottom of the chassis. Use the cable provided to connect the detector to the Model 375-9.

  • Page 10: Radiation Units

    Section 2 Radiation Units The Model 375-9 may be calibrated for almost any desired radiation units of measure. Common units of measure include mR/hr, µR/hr, R/hr, mSv/h, µSv/h, cps, cpm, and kcpm. In each case, the unit of measure is indicated underneath the four-digit display.

  • Page 11: Setting Alarm-Points

    Operational Check (optional) The operational check is an important assurance that the radiation detector and electronics are working correctly. Note: Ludlum Measurements suggests that an operational check be performed on a regular basis. Local procedures may supersede. Ludlum Measurements, Inc.
  • Page 12 Model 375-9 Technical Manual Section 2 For an operational check it is necessary to use a radiation check source (not included, but available). When not being used, store the check source in a secure area. Note: LMI check sources present very minimal risks and are therefore unlicensed (Exempt Quantity Sources reference: 10 CFR 30.71 Schedule B).

  • Page 13: Specifications

    Model 375-9 Technical Manual Section 3 Section Specifications Instrument Specifications : 4-digit LED display with 2 cm (0.8 in.) character height. Display : 000.0-9999 Display Range : can be made to display in mR/hr, R/hr, µSv/h, mSv/h. Display Units : Readings within 10% of true value with detector connected.

  • Page 14: Detector Specifications

    Model 375-9 Technical Manual Section 3 Dead Time : adjustable to compensate for dead time of the detector and electronics (can be read on the display) : a display reading of ˝----˝ and activated low and high Over-range alarms indicate that the radiation field being measured has exceeded...
  • Page 15 Model 375-9 Technical Manual Section 3 : lead shield, 0.130 cm (0.051 in.) thick Energy Compensation : 60 keV Low Energy Cut-off : typical configurations of 0.1 mR/hr through 1 R/hr, 1 mR/hr Range through 10 R/hr, or 10 mR/hr through 100 R/hr. Selection of ranges must be decided at time of purchase.

  • Page 16: Operator Controls And Setup

    Model 375-9 Technical Manual Section 4 Section Operator Controls and Setup Calibration Controls Remove the calibration cover to expose the calibration controls. The calibration controls include the up/down buttons, three calibration potentiometers, and the option dipswitch (detailed in the following subsection).

  • Page 17: Rs-232 Output

    DET FAIL RS-232 Output With the dipswitch in the left position the Model 375-9 dumps CAL MODE RS-232 data onto pin 4 of the 9-pin connector every two seconds. An example program which shows how an IBM compatible PC can be used to collect the data is given on following page.

  • Page 18: Demonstration Program

    Technical Manual Section 4 'Demonstration Program 'Model 375-9 RS-232 communication program written for QuickBasic 'This program causes the computer screen to display the data being dumped from the Model 375-9. 'Needs the following cable: Model 375-9 PC (9-pin) PC (25-pin)

  • Page 19: 9-Pin Data Connector

    Model 375-9 Technical Manual Section 4 9-Pin Data Connector The 9-pin connector provides output signals from the instrument and input voltage to the instrument. The pin assignments are: pin1- +BATTERY pin2- GND IN pin3- FAIL_L pin4- RS232 DUMP pin5- RCDR...

  • Page 20: Common Options And Modifications

    RS-232 port. The Model ALARM FAIL 375-9 will print once every 30 seconds as long as the alarm or fail condition is present. Setup You will need the following: A Model 375-9 instrument, a 1220 40- column printer, and a cable (8303-674).

  • Page 21: Relay Options

    0642.1 04/21/95 16:56:24 ALARM 0000.0 04/21/95 08:32:16 FAIL Relay Options Internal Circuit-Board-Mounted Relay The Model 375-9 has relay options that allow the user to attach strobe lights or horns that will be activated during . The internal circuit HIGH ALARM board-mounted relay is rated for 3 amps.

  • Page 22: To 20 Ma Isolated Output Driver Option

    4 to 20 mA Isolated Output Driver Option 4 – 20 mA Driver (Isolated) Modification Kit Part Number 4396-258 This circuit may be added to the Model 375-9 analog output, providing an isolated 4 to 20 mA output capability. The circuit board (LMI Part Number 5396-754) accepts an analog input, varying between 0 and 5.00 volts, yielding...
  • Page 23 Maximum V =15V. : 250 ohm. Terminating Resistor Model 375-9 Recorder Output Connections (9-pin D-sub connector) Pin 5 is “SIG”, current output (was voltage output). Pin 6 is “LGND”, Isolated Loop Return or Loop Ground. Board Header Pin-out P1-1) Loop GND (Isolated) P1-2) 4-20 current output (Isolated) P2-1) +7.5VDC , RAWDC from main circuit board number 5396-160...

  • Page 24: Safety Considerations

    Model 375-9 Technical Manual Section 6 Section Safety Considerations Environmental Conditions for Normal Use Indoor use only No maximum altitude Temperature range of –20°C to 50°C (5°F to 122°F); May be certified for operation from –40°C to 65°C (–40°F to 150°F).

  • Page 25: Cleaning Instructions And Precautions

    Technical Manual Section 6 Cleaning Instructions and Precautions The Model 375-9 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 26: Replacement Of Main Fuse

    Model 375-9 Technical Manual Section 6 Caution!: Do no touch the circuit board in the calibration window due to possible electric shock. Warning! The operator is strongly cautioned to take the following precautions to avoid contact with internal hazardous live parts that are accessible using a tool: 1.

  • Page 27: Calibration

    Model 375-9 Technical Manual Section 7 Section Calibration Instrument Calibration Parameters The calibration parameters, LOW ALARM HIGH ALARM CAL CONST DEAD can only be changed while in calibration TIME BACKGROUND SUBTRACT mode. Switch the top dipswitch to the right to switch into CAL MODE calibration mode.

  • Page 28: Threshold

    Model 375-9 Technical Manual Section 7 Threshold potentiometer located under the calibration cover is used THRESHOLD to set the threshold for pulses coming from the detector. The typical set point is 500 mV. Battery Charge The potentiometer labeled , located under the calibration cover, is used to set the backup battery trickle charge voltage.

  • Page 29: Detector Electronics Checkout

    Model 375-9 Technical Manual Section 7 Check the reading at 1R/hr, 100 mR/hr, 10 mR/hr, 1 mR/hr, and 0.1 mR/hr. Detector Electronics Checkout Warning! The majority of the components of the electrometer operate at 150 volts above chassis potential. Accidental short circuit to the case can cause component failure indicated by a sudden increase in supply current.
  • Page 30 Model 375-9 Technical Manual Section 7 EN3P5M 100PF 100K To Scaler 1/4W 1/4W Common Isolating capacitor C1 is connected to Figure 1 the Scaler with high voltage on the counting line. Output Check 1. With the detector connected and the electrometer in the housing, adjust R1 potentiometer fully clockwise.
  • Page 31 Model 375-9 Technical Manual Section 7 4. Disconnect detector and connect detector simulator. (Refer to Figure 2.) a. Apply 1.5 volts and record the full- scale count rate (approximately 1,100,000 cpm). b. Apply 0.8 volts and record the count rate.

  • Page 32: 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. 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.

  • Page 33: Parts List

    Model 375-9 Technical Manual Section 9 Section Parts List Reference Description Part Number Model 375-9 Digital Wall- Mount Area Monitor UNIT Completely Assembled Model 375 Digital Wall-Mount Area Monitor 48-3036 BOARD Completely Assembled Main Board, Main Board 5396-608 Drawing 396 × 608 CRYSTAL 6.144MHZ...
  • Page 34 Model 375-9 Technical Manual Section 9 Reference Description Part Number MAX810LEUR 06-6424 INTEGRATED MAX220CSE 06-6329 CIRCUITS OPA2343 06-6582 AT89C51RC2 06-6893 X24C02S8T5 06-6299 TLC372ID 06-6290 ICL7663SCBA-T 06-6302 ICM7218CIQI 06-6311 U8-U11 SA08-11EWA LED/DISPLAY 07-6389 U12-U13 KB-2685EW RED 07-6400 U14-U15 KB-2785YW YELLOW 07-6371...
  • Page 35 Model 375-9 Technical Manual Section 9 Reference Description Part Number 1M, 1/8W, 1% 12-7844 R6-R8 100K, 1/8W, 1% 12-7834 196K, 1/8W, 1% 12-7897 R10-R11 100K, 1/8W, 1% 12-7834 0 OHM (JUMPER) 12-7104 R13-R16 10K, 1/8W, 1% 12-7839 22.1K, 1/8W, 1% 12-7843 22.1K, 1/8W, 1%...

  • Page 36: Wiring Diagram, Drawing 396 × 869

    Model 375-9 Technical Manual Section 9 Reference Description Part Number Wiring Diagram, Drawing 396 × 869 DM62J12S205PQ, ON/OFF 08-6715 SWITCH 1-640456-3, MTA100x13, CONNECTORS 5396-608 13-8100 640456-3, MTA100x3, ALARM RELAY 13-8081 640456-5, MTA100x5, ACC. 13-8057 640456-3, MTA100x3 13-8081 640456-3, MTA100x3, 3 PIN CONNECTOR...
  • Page 37 Model 375-9 Technical Manual Section 9 Reference Description Part Number 0.01uF, 200V 04-5725 10uF, 25V 04-5655 100pF, 100V 04-5661 0.47uF, 50V 04-5681 0.01uF, 200V 04-5725 10uF, 25V 04-5655 0.01uF, 50V 04-5664 0.001uF, 100V 04-5659 68uF, 6.3V 04-5654 10uF, 25V 04-5655...
  • Page 38 Model 375-9 Technical Manual Section 9 Reference Description Part Number 100K, 1/8W 12-7834 6.81K, 1/8W 12-7857 22.1K, 1/8W 12-7843 100K, 1/8W 12-7834 1M, 1/8W 12-7844 10 OHM, 1/8W 12-7836 14.7K, 1/8W 12-7068 110K, 1/8W 12-7052 82.5K, 1/8W 12-7849 R17-R19 10M, 1/8W...

  • Page 39: Drawings And Diagrams

    Model 375-9 Technical Manual Section 10 Section Drawings and Diagrams Main Board Schematic, Drawing 396 × 608 (4 sheets) Main Board Component Layout, Drawing 396 × 609A (2 sheets) Wiring Diagram, Drawing 396 × 869 Remote Electrometer, Drawing 280 × 219 Electrometer Board Component Layout, Drawing 280 ×...

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