Ludlum Measurements 2242 Manuel utilisateur

LUDLUM MODEL 2242

SURVEY METER

November 2010

Serial Number 219764 and Succeeding

Serial Numbers

LUDLUM MODEL 2242

SURVEY METER

November 2010

Serial Number 219764 and Succeeding

Serial Numbers

LUDLUM MEASUREMENTS, INC.

501 OAK STREET, P.O. BOX 810

SWEETWATER, TEXAS 79556

325-235-5494, FAX: 325-235-4672

STATEMENT OF WARRANTY

Ludlum Measurements, Inc. warrants the products covered in this manual to be free of

defects due to workmanship, material, and design for a period of twelve months from the

date of delivery. The calibration of a product is warranted to be within its specified

accuracy limits at the time of shipment. In the event of instrument failure, notify Ludlum

Measurements to determine if repair, recalibration, or replacement is required.

This warranty excludes the replacement of photomultiplier tubes, G-M and proportional

tubes, and scintillation crystals which are broken due to excessive physical abuse or used

for purposes other than intended.

There are no warranties, express or implied, including without limitation any implied

warranty of merchantability or fitness, which extend beyond the description of the face

there of. If the product does not perform as warranted herein, purchaser’s sole remedy

shall be repair or replacement, at the option of Ludlum Measurements. In no event will

Ludlum Measurements be liable for damages, lost revenue, lost wages, or any other

incidental or consequential damages, arising from the purchase, use, or inability to use

product.

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.

Your cooperation will expedite the return of your equipment.

LUDLUM MEASUREMENTS, INC.

ATTN: REPAIR DEPARTMENT

501 OAK STREET

SWEETWATER, TX 79556

800-622-0828 325-235-5494

FAX 325-235-4672

Ludlum Measurements, Inc. November 2010

Table of Contents

Introduction 1

Getting Started 2

Unpacking and Repacking 2-1

Battery Installation 2-1

Operating the Instrument 2-2

Principle of Operation 2-2

Specifications 3

Description of Controls and Functions 4

Operator Controls 4-1

Internal Controls 4-2

Display 4-3

Safety & Maintenance Considerations 5

Environmental Conditions for Normal Use 5-1

Cleaning Instructions and Precautions 5-1

Warning Markings and Symbols 5-1

Maintenance 5-2

Recalibration 5-3

Batteries 5-3

Setup and Calibration 6

Entering or Changing Switch Board Parameters 6-1

The Function Switch 6-1

Function Switch Position Descriptions and Variables 6-2

Calibration 6-4

General Detector Setup Information 6-4

Exposure Rate Calibration 6-4

Detector Overload (OVL) Calibration 6-5

Loading Default Parameters 6-6

MODEL 2242 Technical Manual

Ludlum Measurements, Inc. November 2010

Troubleshooting 7

Technical Principle of Operation 8

Recycling 9

Parts List 10

Model 2242 Survey Meter 10-1

Main Board, Drawing 408 × 223 10-1

Calibration Board, Drawing 408 × 229 10-3

Display Board, Drawing 408 × 79 10-4

Switch Board, Drawing 408 × 46 10-4

Wiring Diagram, Drawing 408 × 221 10-5

Drawings and Diagrams 11

MODEL 2242 Technical Manual Section1

Ludlum Measurements, Inc. Page 1-1 November 2010

Introduction

he Model 2242 is a portable microprocessor-based digital Ratemeter

designed for detection and measurement of ionizing radiation. The

data is presented on a 4-digit Liquid Crystal Display (LCD). A 3-

position switch labeled “OFF/LOW (mR/h)/HIGH (R/hr)” selects

the desired operating range for the instrument. The internal detectors are

energy-compensated GM (Geiger-Mueller) tubes capable of measuring fields

from 0.01 mR/hr to 999.9 R/hr.

This instrument incorporates independent adjustable alarms for each range.

The first-level alarm is indicated by ALERT on the LCD. Display of ALARM

on the LCD, a continuous audible tone and an illuminated alarm LED (red)

indicate the second-level alarm. Both audible alarms can be silenced

(acknowledged) by depressing the RESET switch.

Other features include Dead Time Correction (DTC) to compensate for

detector dead time; audible click-per-event with programmable 1, 10, 100,

and 1000 divide-by; LCD backlight with programmable ON time;

programmable fixed or variable response time; and count overflow visual

alarm indicating that the counting circuitry is nearing the maximum counting

capability.

All of the features described above may be programmed manually, using the

internal switch board, or by computer through the RS-232 port. The switch

board can be removed after entering or changing parameters to prevent

undesired altering of setup parameters.

A regulated high voltage power supply, dual set points adjustable from 400

to 2500 volts, with detector overload detection add versatility to the

instrument. A single adjustable discrimination setting applies to both internal

detectors. All calibration controls are covered to prevent any inadvertent

altering of the detector operating parameters.

Section

MODEL 2242 Technical Manual Section1

Ludlum Measurements, Inc. Page 1-2 November 2010

The instrument operates on two ˝D˝cell flashlight batteries. The unit body

is made of cast-and-drawn aluminum and is covered in beige powder-

coating to aid in surface decontamination.

MODEL 2242 Technical Manual Section2

Ludlum Measurements, Inc. Page 2-1 November 2010

Getting Started

Unpacking and Repacking

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

the instrument and accessories (batteries, cables, 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 2242

serial number is located on the front panel below the battery compartment.

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 that the range selector switch is in the ˝OFF˝position. Open the

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

counterclockwise ¼ 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, push down and turn the

quarter-turn thumb screw clockwise ¼ turn.

Note:

Center post of a flashlight battery is positive. The batteries are

placed in the battery compartment in opposite directions.

Section

MODEL 2242 Technical Manual Section2

Ludlum Measurements, Inc. Page 2-2 November 2010

Operating the Instrument

Turn the OFF/LOW(mR/hr)/HIGH(R/hr) switch to the

LOW(mR/hr) position. The display goes through an

initialization sequence. The display will show all “8”s

with decimal points. Check to make sure all segments are

on, as illustrated to the left.

The LCD then shows the firmware number in the

format “P-XX YY.” The “XX” is the firmware number,

and the “YY

Select the desired AUD ON/OFF parameter and proceed

to use instrument. Switch up to the R/hr range only if the

OFLOW and/or OVERLOAD symbols are displayed, or if

the display shows 999 mR/hr.

” is the firmware version. (The figure to the

left is for example only, to illustrate location of display.)

Principle of Operation

The Model 2242 utilizes microprocessor-based technology, providing an

extensive range of operating features. Two independent detector parameters

can be stored in memory (with the exception of a single discrimination

parameter).

The Model 2242 incorporates a detachable switch board used to program

detector and operating parameters into non-volatile memory (retains the

data even after the power is removed). The switch board may be removed so

that the operating parameters cannot be altered. If multiple units are to be

used at one location, fewer Switch Boards may be purchased in order to

program all instruments. A 16-position rotary switch (FUNCTION) selects

each of the 16 operating/detector parameters. Three pushbutton switches

on the Switch Board provide the means to change and save the variables for

each of the parameters.

An RS-232 port is also available via the switch board for computer

connection. An optional can with the RS-232 connector mounted externally

is also available. Communication baud rate may be set with the FUNCTION

switch to correspond to the computer baud. The computer can adjust the

detector parameters and retrieve data.

MODEL 2242 Technical Manual Section2

Ludlum Measurements, Inc. Page 2-3 November 2010

An LCD provides the readout for the

ratemeter data with the programmed units

and multipliers, as well as ALERT, ALARM,

OVERLOAD and OVERFLOW annunciators,

"low battery" icon, and scaler counting

mode indication (COUNTING – not used). The four 0.5" digits are used for

the ratemeter data. The LCD also displays the variables during the manual

programming sequence. (See figure above.) A front panel alarm LED (red)

illuminates during an alarm condition.

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