LUDLUM 2363 Bedienungsanleitung

LUDLUM MODEL 2363

GAMMA-NEUTRON SURVEY METER

October 2015

Serial Number 220855 and Succeeding

Serial Numbers

LUDLUM MODEL 2363

GAMMA-NEUTRON SURVEY METER

January October 2015

Serial Number 220855 and Succeeding

Serial Numbers

Ludlum Measurements, Inc. January 2015

Table of Contents

Introduction 1

Getting Started 2

Unpacking and Repacking 2-1

Battery Installation 2-1

Connecting a Detector to the Instrument 2-2

Battery Test 2-2

Operating the Instrument 2-3

Principle of Operation 2-3

Specifications 3

Description of Controls and Functions 4

Operator Controls 4-1

Internal Controls 4-2

Safety Considerations 5

Environmental Conditions for Normal Use 5-1

Cleaning Instructions and Precautions 5-1

Warning Markings and Symbols 5-2

Calibration and Maintenance 6

Calibration 6-1

Meter Calibration 6-1

Establishing an Operating Point 6-2

Maintenance 6-3

Recalibration 6-3

Batteries 6-4

RS-232 Interface 7

Communicating With the Model 2363 7-1

Commands 7-1

Read Commands 7-1

Set Commands 7-2

Command Descriptions 7-2

Model2363 TechnicalManual

Ludlum Measurements, Inc. January 2015

Model 2363 Interface Software 7-8

Functions 7-8

Main Screen 7-8

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 8

Troubleshooting 9

Recycling 10

Parts List 11

Model 2363 Gamma-Neutron Survey Meter 11-1

Main Board, Drawing 390 × 295 11-1

LED Board, Drawing 390 × 299 11-4

LCD Display Board, Drawing 390 × 170 11-4

Wiring Diagram, Drawing 390 × 290 11-4

Drawings and Diagrams 12

Model2363 TechnicalManual Section1

Ludlum Measurements, Inc. Page 1-1 January 2015

Introduction

he Ludlum Model 2363 Gamma/Neutron Survey Meter is an easy-

to-use survey instrument capable of measuring both neutron and

gamma radiation levels simultaneously, incorporating both analog

and digital displays for maximum versatility. This instrument logs up

to 1000 data points in non-volatile memory and consists of sample number,

date/time stamp, ratemeter measurements (both neutron and gamma),

integrated dose, and location identifier (10 characters).

The Model 2363 contains an internal energy-compensated GM (Geiger-

Mueller) detector for gamma measurements and is normally sold with an

external Model 42-41 PRESCILA detector for use in neutron measurements.

This instrument incorporates a long arc-length analog meter face, which

normally displays exposure rates from 0 to 10 mrem/hr. The instrument’s

digital display is a full six-digit liquid crystal display (LCD) with an arrow

symbol for counting overflow. The displayis direct-driven for optimalviewing

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.

Neutron and gamma pulses are allotted different audible tones for ease of user

discrimination. A two-position, momentary-action switch allows either an

analog meter reset or display of the current integrated dose rate on the LCD.

The following alarms may be set via the RS-232 port:

Neutron Rate meter (0-9999.99 mrem/hr)

Gamma Rate meter (0-9999.99 mrem/hr)

Section

Model2363 TechnicalManual Section1

Ludlum Measurements, Inc. Page 1-2 January 2015

Neutron + Gamma Rate (0-9999.99 mrem/hr)

Neutron + Gamma Integrated Dose (0-99999.9 mrem)

These alarm points, when exceeded, will light the appropriate LED on the

front panel and activate the audio alarm. The alarms will continue until the

RESET toggle switch is depressed, or until the INTEGRATED DOSE is zeroed.

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

Setting and reading of instrument parameters

Setting of the CALIBRATION DUE DATE

Setting of the internal real-time clock/calendar

Model2363 TechnicalManual Section2

Ludlum Measurements, Inc. Page 2-1 January 2015

Getting Started

Unpacking and Repacking

Remove the calibration certificate and place it in a secure location. Remove

the instrument and accessories (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 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.

Important!

If multiple shipments are received, ensure that the detectors and

instruments are not interchanged. Each instrument is calibrated

to specific detectors, and therefore not interchangeable.

To return an instrument for repair or calibration, provide sufficient packing

material to prevent damage during shipment. Also provide appropriate

warning labels to ensure careful handling. Include detector(s) and related

cable(s) for calibration. Include brief information as to the reason for return,

as well as return shipping instructions:

- Return shipping address

- Customer name or contact

- Telephone number

- Description of service requested and all other necessary

information

Battery Installation

Ensure the Model 2363 range selector switch is in the ˝OFF˝position. Open

the battery lid by pushing down and turning the quarter-turn thumbscrew

Section

Model2363 TechnicalManual Section2

Ludlum Measurements, Inc. Page 2-2 January 2015

counterclockwise a quarter of a turn. Install two ˝D˝size batteries in the

compartment.

Note the (+) and (-) marks inside the battery door. Match the battery polarity

to these marks. Close the battery box lid and push down and turn the

quarter-turn thumb screw clockwise a quarter of a turn.

Note:

The center post of a flashlight battery is positive. The batteries

are placed in the battery compartment in opposite directions.

Connecting a Detector to the Instrument

Caution!

The detector operating voltage (HV) 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 OFF position before

connecting or disconnecting the cable or detector.

Connect oneend of a detector cable to the detector by firmly pushing the

connectors together while twisting clockwise a quarter of a turn. Repeat the

process in the same manner with the other end of the cable and in the

instrument.

Battery Test

The batteries should be checked each time the instrument is turned on. Move

the range selector switch to the BAT position. Verify that all three alarm LEDs

on the front panel turn on briefly. The LCD should go through an

initialization sequence displaying ˝88:8.8:8.8˝,then the current sample

number, and finally ˝0˝. Ensure that the meter needle deflects to the battery

check portion on the meter scale. If the meter does not respond, check to see

if the batteries have been correctly installed. Replace the batteries if necessary.

Model2363 TechnicalManual Section2

Ludlum Measurements, Inc. Page 2-3 January 2015

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. Both the appropriate alarm lamp and audio alarm signal should

activate.

Depress the RESET toggle switch. The meter needle should drive to zero, and

the alarm circuit should de-energize, shutting off both visual and audible

alarms.

Proceed with use.

Principle of Operation

The detected neutron count rate is displayed by selecting the ˝N˝position on

the three-position ˝N/N+G/G˝toggle switch. Similarly, the sum of the neutron

and gamma count rate or the gamma count rate only is displayed by selecting

the appropriate ˝N+G˝or ˝G˝position. The digital display will show a direct

reading in dose rate. Multiply the reading on the analog rate meter by the range

multiplier position.

The ˝RESET˝ toggle switch position resets the meter pointer to zero and

deactivates any current alarm. The current integrated dose is displayed on the

digital meter dial by selecting the ˝INTEGRATED DOSE (ID)˝ position.

Note:

The accumulated integrated dose may be reset by pressing the

ID toggle switch while turning the instrument ON.

Model2363 TechnicalManual Section3

Ludlum Measurements, Inc. Page 3-1 January 2015

Specifications

Ranges: four linear range multiples of ×0.1, ×1, ×10, and ×100; used in

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: ≤ 15%

Sensitivity: Gamma is approximately 1000 cpm/mR/hr (internal

detector. Neutron is approximately 350 cpm/mrem/hr (with Model 42-

41L).

Thresholds: Gamma threshold is fixed at 50 millivolts (mV). Neutron

threshold is adjustable from 5 to 100 mV.

Neutron High Voltage: internally adjustable from 500 to 1500 Vdc

Gamma High Voltage: fixed at 550 Vdc

Linearity: within 10% of true value for the analog rate meter; 2% for the

LCD

Response Time: ×0.1 range multiplier = 7 seconds, ×1 = 7 seconds,

×10 = 2 seconds, ×100 = 2 seconds; all response times measured from

10-90% of full scale

Audio: dual- or single-tone click-per-event through a built-in speaker with

an adjustable volume control located on the front panel; headset jack

located on the instrument can

Section

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