Surveyor 200™ Portable Survey Meter User`s Manual
Contents
1. NOTE Do not disturb the settings of any controls except those marked XI X10 and X 100 Calibration procedures should follow those specified by the appropriate regulatory agencies 6 2 Optional CPM Calibration Electronic calibration counts per minute 1s the only type that can be done when external probes other than a specific SWGM or EWGM are supplied or when the instrument 1s not supplied with a given probe When an electronic calibration is performed the unit is connected to a variable frequency pulse generator the generator is then set at the frequencies needed to produce 65 and 35 of full scale meter readings cpm for each range Calibration controls are set for 65 of full scale readings and linearity is checked by going to the 35 readings Surveyor 200IM Portable Survey Meter 1012 0 U 0798 Page A 1 User s Manual Appendix A Bicron QC Acceptance Procedure Number 1012937 1 0 Preparation 4 Turn the Control Switch to HV and 1 Perform a visual inspection of finished product connect a high voltage measuring device with an impedance 1000 megohms to the probe connector center pin Adjust 2 Remove all 9V batteries and connect a the high voltage supply via R45 50 9 30 V 0 05 V power source across the Kohm pot to 900 VDC 3 main battery terminals on the battery board Leave the control switch in HV and adjust R29 500 ohm span pot until the 2 0 Calibration meter reads in the center of th2. U 0798 Page A 3 User s Manual Appendix A Bicron QC Acceptance Procedure Number 1012937 cont d 3 0 Audio Switch Test 4 0 Anti saturation Circuit Test Perform the following test if the Audio option is installed 1 Turn the Control Switch to X100 and connect a 1000 megohm resistor across 1 Connect a variable frequency pulse the probe connector from 900V to generator to pin 5 of the 24 pin ground The meter should peg beyond connector full scale 2 Turn the Audio Switch to ON and check 2 Replace the 1000 megohm resistor with a to see that the audio functions properly on 2000 megohm resistor The meter should all three ranges using the pulse generator remain at zero Also check that the audio remains silent when the Selector Switch is on BAT 3 Remove the 2000 megohm resistor and HV 3 Turn the Audio Switch to OFF and the Alarm On off Switch mounted on the main PC board to ON Drive the meter well beyond full scale with the pulse generator and observe that a continuous tone is heard Do this on all three ranges 4 Disconnect the pulse generator Surveyor 200IM Portable Survey Meter Page A 4 1012 0 U 0798 User s Manual Appendix A Bicron QC Acceptance Procedure Number 1012937 cont d 5 0 CPM Calibration Test Perform the following test if a CPM calibration was done 1 Remove all test equipment from the unit Turn the Control Switch to OFF and 6 0 Wrap up 1 Leave the Control Switch on X
3. photomultiplier tubes GM and proportional tubes crystal and other solid state detectors and batteries Surveyor 200IM Portable Survey Meter Page 6 1012 0 U 0798 User s Manual PROCEDURES and CAUTIONS The equipment herein described is designed and manufactured in compliance with all applicable safety standards Nevertheless certain hazards are inherent in the use of electronic and radiometric equipment Adequate warnings are included in the manual and on the product itself to cover hazards that may be encountered in normal use and servicing of this equipment No other procedures are warranted by Bicron It shall be the owner s or user s responsibility to see to it that the procedures and cautionary notes are heeded Failure on the part of the user in any way to follow the prescribed procedures shall absolve Bicron and its agents from any resulting liability This instrument is intended solely for the detection and measurement of ionizing radiation It should be used only by persons who have been trained in the proper interpretation of its readings and the appropriate safety procedures to be followed in the presence of radiation All instructions and warnings contained in this manual or on the instrument must be read before use and must be strictly followed Failure to follow these instructions and warnings may result in inaccurate readings and or user hazard Indicated battery and other operations tests must be performed prior to each
4. prior permission of the seller This legend shall be marked on any reproduction of this data in whole or in part Copyright Saint Gobain Industrial Ceramics Inc 1998 All rights reserved Printed in U S A Surveyor 200IM Portable Survey Meter 1012 0 U 0798 Page 1 User s Manual FOREWORD This manual provides the basic operation and maintenance procedures for the BICRON Surveyor 200 Portable Survey Meter Section 1 0 Introduction provides a general description of the instrument and its operation and a detailed listing of its physical and performance specifications Section 2 0 Battery Installation describes the procedure for changing the battery and checking its performance Section 3 0 High Voltage Test describes how to test the High Voltage Section 4 0 Operation provides a detailed description of all the features and settings for the Surveyor 200 and complete operating instructions Section 5 0 Hardware Description provides a brief description of the three electronic circuits that make up the instrument and a description of the GM Tube Section 6 0 Calibration provides directions for calibration of the instrument The Appendices are A QC Acceptance Procedure which includes calibration procedures B a complete spare parts list so instruments can be repaired on site and C schematic and pictorial diagrams to facilitate repair procedures Writing Conventions In order to maintain consistency
5. use to assure that the instrument is functioning properly CAUTION FAILURE TO CONDUCT PERIODIC PERFORMANCE TESTS IN ACCORDANCE WITH ANSI N323 1978 PARAGRAPHS 4 6 AND 5 4 AND TO KEEP RECORDS THEREOF IN ACCORDANCE WITH PARAGRAPH 4 5 OF THE SAME STANDARD COULD RESULT IN ERRONEOUS READING OF POTENTIAL DANGER ANSI N323 1978 BECOMES BY THIS REFERENCE A PART OF THIS OPERATING PROCEDURE INSPECTION Instruments should be examined and tested as soon as received Claims for transportation damages if any should be filed at once with the delivery carrier Surveyor 200IM Portable Survey Meter 1012 0 U 0798 Page 7 User s Manual 1 0 Introduction 1 1 General Description The Bicron Surveyor 200 is a portable survey meter designed for use with an appropriate GM probe to detect and measure ionizing radiation The instrument features a recessed meter movement laminated control panel cpm and mR h meter scales single on off range selector switch MHV probe connector and mounted probe holder Advanced circuit design provides a detector HV check anti saturation dead time compensation and response time optimized for each range Built in audio is available 1 2 Specifications Radiation Detected Alpha beta gamma and x ray depending upon detector used Range Linear ranges of 0 2 0 20 and 0 200 mR h with SWGM or EWGM probe 0 2400 0 24 000 and 0 240 000 CPM Accuracy Within 10 of reading for Cs when calibrate
6. writing BICRON NE s obligation with regard to such products shall be limited to repair or replacement FOB BICRON NE factory or authorized repair station at BICRON NE s option The calibration when applicable for each system is warranted to be within its specified accuracy at the time of shipment If this initial calibration is determined to be in error the system will be recalibrated at no charge The aforesaid warranty does not cover systems options or probes which are subject to excessive physical abuse or are used for purposes other than those intended In no event shall BICRON NE be liable for consequential or special damages transportation installation adjustment work done by customer or other expenses which may arise in connection with such defective product or parts EXCLUSION OF LIMITED WARRANTY THERE ARE NO WARRANTIES EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS WHICH EXTEND BEYOND THE DESCRIPTION ON THE FACE HEREOF THIS EXPRESS WARRANTY EXCLUDES COVERAGE OF AND DOES NOT PROVIDE RELIEF FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KIND OR NATURE INCLUDING BUT NOT LIMITED TO LOSS OF USE LOSS OF SALES OR INCONVENIENCE THE EXCLUSIVE REMEDY OF THE PURCHASER IS LIMITED TO REPAIR RECALIBRATION OR REPLACEMENT OF THE SYSTEM AT BICRON NE s OPTION This warranty specifically excludes the following items which are covered by their original manufacturers warranties
7. 1 Geotropism Within 2 of full scale Shock 100 g per lightweight machine of MIL STD 202C method 202B Vibration 5 g in each of three mutually orthogonal axes at one or more frequencies form 10 33 Hz Construction Splash proof shock proof two piece all metal case Scratch resistant laminated control panel and Bicron Kleen Krome trim on case top durable black polyurethane paint on handle and case bottom stainless steel probe clip on handle Audio option When specified the unit is equipped with a built in speaker controlled by a panel mounted on off switch This speaker provides an audible click for each detector pulse or if desired an audible over range alarm signal Size 10 8 x 20 3 x 17 3 cm 4 25 x 8 x 6 8 including handle and probe clip Weight 1 kg 2 2 Ib excluding probe Surveyor 200IM Portable Survey Meter 1012 0 U 0798 Page 9 User s Manual 2 0 Battery Information Battery Type 9 volt Mallory MN1604 or equivalent 2 1 Procedure 1 Turn instrument off 2 Open pull catches at ends of case and separate case bottom from top 3 Install battery in appropriate clop on bottom circuit board clip for spare battery is so marked observing proper polarity 4 Replace bottom orienting rubber under battery close catches Parallel wired Option Instruments with this option have both battery clips wired into the circuit Installing a second battery thus provides a
8. 100 and turn the Audio Switch to ON Connect a suitable GM probe to the instrument Place a small check source near the probe and switch to each of the three ranges in turn You should obtain a meter reading for each range install a new 9V alkaline battery MN 1604 or equivalent in the appropriate battery clip either clip if the unit has the parallel wire battery option Complete date and sign a Certificate of Calibration Surveyor 200IM Portable Survey Meter 1012 0 U 0798 Page A 5 User s Manual Appendix B Suggested Spare Parts List We recommend that you keep some quantity of the following spare parts in inventory The number of instruments you own and the severity of your operating conditions should guide you in determining specific quantities Description Part No Main PC Board Assembly 1012017 Switch PC Board Assembly 1002027 Battery PC Board Assembly 9420001 Case Top Assembly 1012147 Handle 9710002 Meter 9400016 Meter Window 9400011 Case Bottom Assembly 1012050 Battery 9V alkaline MN 1604 9750001 Cable Probe 9801001 Knob function 9770003 Knob round w pointer 9770001 Surveyor 200IM Portable Survey Meter Page A 6 1012 0 U 0798 User s Manual BLANK PAGE Surveyor 200IM Portable Survey Meter 1012 0 U 0798 Page A 7 User s Manual Appendix C Parts List No 1012917 Description Part No Main PC Board Assembly 1012017 Switch PC Board Assembly 1002027 Battery PC Board Assembly 9420001 Case
9. BICRON4NE 6801 Cochran Road Solon Ohio 44139 USA Telephone 440 248 7400 Toll Free 800 472 5656 Fax 440 349 6581 http www bicron com BICRON NE Surveyor 200 Portable Survey Meter User s Manual Publication No 1012 0 U 0798 002 Release Date July 22 1998 Part No 1012907 fm SAINT GOBAIN Rev G INDUSTRIA RAMIC Saint Gobain Industrial Ceramics Inc e LEE ISO 9001 Quality System Certified Publication Number 1012 0 U 0798 002 Part No 1012907 Rev G Replaces and Supersedes 1012 0 U 0896 Part No 1012907 Rev F Original Issue February 1984 NOTICE BICRON NE reserves the right to make changes to any product to improve reliability function or design and does not assume any liability arising from either application or use of any product or circuit described herein Information presented in this publication has been carefully checked and is believed to be entirely reliable however no responsibility is assumed for inaccuracies Furthermore the information does not convey to the user any license under the patent rights of BICRON NE or others Specifications subject to change without notice LIMITED RIGHTS LEGEND The data in this manual is considered proprietary data It may be duplicated and used by or on behalf of the customer with the express limitations the proprietary data may not be disclosed outside the customer or be used for purposes of manufacture without
10. Top Assembly 1012147 Handle 9710002 Meter 9400016 Meter Window 9400011 Meter Support Bracket 9850002 MHV Connector 9782001 Probe Clip 9460004 Case Bottom Assembly 1012050 Miscellaneous Battery 9V alkaline MN1604 9750001 Cable Probe MHV MHV 36 inch 9801001 Knob function 9770003 Knob round w pointer 9770001 Surveyor 200IM Portable Survey Meter Page A 8 1012 0 U 0798 User s Manual BLANK PAGE Surveyor 200IM Portable Survey Meter 1012 0 U 0798 Page A 9 User s Manual Appendix D Drawings The drawings listed below follow this page Drawing Name Number Schematic Circuit Diagram Surveyor 200A B1012927 Main PC Board Assembly Surveyor 200A D1012017 Switch PC Board Assembly Surveyor 50A amp 200A B1002027 Rev Surveyor 200IM Portable Survey Meter Page A 10 1012 0 U 0798 User s Manual BLANK PAGE
11. d D Readjust the frequency to the value required to calibrate the unit at 35 of full scale see Table T 1 and note the meter reading If the reading is within the acceptable range listed in Table T 1 note the meter readings from steps C and D on a Certificate of Calibration If not readjust the frequency to the 65 value and adjust R19 to produce a different reading within the acceptable range Repeat steps D and E until the meter readings obtained are within the acceptable ranges for both the 65 and 35 of full scale calibration points Repeat steps B C D E and F if necessary for the X10 range using R17 the 500 Kohm X10 calibration pot the X1 range using R15 the 5 megohm calibration pot H 1012 0 U 0798 If specified to be supplied with an SWGM or EWGM probe perform an isotopic calibration 1 Connect the GM probe to the probe connector via a cable 2 Place the probe in a known Cs radiation field in a fixed geometry 3 Calibrate each range at 65 and 35 of full scale using the values in Table T 2 and the same calibration pots as those listed for a CPM calibration 7 Mark all trimpot bodies in such a way as to show the general position of the adjustment screws after calibration mR h Reading mR h X100 65 X10 65 X10 85 7 130 7 11 7 6 3 143 7 7 X1 65 117 143 X1 35 0 63 0 77 Table T 2 Surveyor 200IM Portable Survey Meter 1012 0
12. d according to NRC Reg Guide 10 8 Detector Choice of GM probes High Voltage Electronically stabilized factory set at 900 V HV Test Exclusive self test to verify detector HV power supply Connector MHV Warmup time None Saturation Typically greater than 1000 R h on all ranges with exclusive anti saturation circuit for most GM probes greater than 5 R h for pancake GM probes Response Time Optimized for each range 0 90 of final reading as follows Range Time 2 mR h 6 sec 20 mR h 3 sec 200 mR h 1 sec Dead time Compensation Exclusive circuitry provides a near linear response Temperature Operational from 40 C to 60 C Humidity Less than 5 change in reading from 10 95 relative humidity Control Six position rotary switch off bat HV X100 X10 X1 See Figure 2 Battery Complement Single 9 Volt MN1064 or equal The additional battery holder may be used for storage of spare or parallel wired Battery Life Greater than 100 hours with single battery or greater than 200 hours with parallel batteries option Surveyor 200IM Portable Survey Meter Page 8 1012 0 U 0798 User s Manual 1 0 Introduction cont d 1 2 Specifications cont d Display Ruggedized recessed high torque 1 mA meter with 8 51 cm 3 35 inch scale marked 0 2 mR h 0 2400 CPM bat ok HV ok Meter protected by impact resistant Lexan polycarbonate window See Figure
13. e HV ck Perform the following calibrations checkband 1 Turn the Control Switch to OFF 6 Mechanically zero the meter via the rear zero adjustment screw on the meter barrel Perform a CPM calibration unless isotropic calibration is specified A Turn the Control Switch to X100 and connect a variable frequency pulse generator to test point 2 pin 5 of the 24 pin connector 2 Turn the Control Switch to X100 Check the 5 supply at pin 1 of U6 ICL 7663 The reading should be 5 VDC 10 B Adjust the frequency to the value required to calibrate the unit at 65 3 Leave the Control Switch set at X100 of full scale in the meter see Table and connect a voltmeter between pins 1 T 1 ground and 15 of the 24 pin connec tor Adjust R31 50Kohm zero pot so the C Adjust R19 50 Kohm X100 voltmeter reads 1 mVDC 2 5 1 calibration pot until the meter reads 65 of full scale Table T 1 Pulse Generator Simulated Acceptable Meter output Hz CPM Reading X100 65 1558 156 000 140 400 171 600 X100 35 1030 84 000 75 600 92 400 X10 65 15 600 14 040 17 160 13 X10 35 8400 7 560 9 240 Xi 65 1 560 1404 1 716 x1 35 756 924 NOTE The values in this table may not correspond to those for other Bicron or competitive models Surveyor 200IM Portable Survey Meter Page A 2 User s Manual Appendix A Bicron QC Acceptance Procedure Number 1012937 cont d 2 0 Calibration cont
14. e reading on the calibrated meter scale The circuitry includes a unique dead time compensation technique to provide nearly linear response over the full range an anti saturation circuit which forces the meter beyond full scale in high radiation fields automatic time constant selection and temperature compensation 3 The optional audio circuitry for individual pulse counting and over range alarm 5 2 GM Tube Probes The GM rube consists of a thin shell which acts as the cathode a fine wire anode suspended within the shell and an inert gas into which a small amount of a halogen gas has been mixed to act as a quenching agent End window and pancake tubes have a thin mica entrance window A potential of approximately 900 volts is maintained between the two electrodes with the anode always positive This voltage is slightly less than that required to produce a discharge in the gas When a nuclear particle or ray of sufficient energy enters the GM tube it ionizes a molecule of the inert gas The positive ions are attracted to the cathode and the electrons are attracted to the anode because of the high voltage maintained between the electrodes In their movement toward the electrodes these charged particles trigger the ionization of additional gas molecules resulting in an avalanche of ions flowing between the electrodes The gas discharge thus created is similar to the glow of aneon lamp The tube conducts as long as the gas is i
15. izing radiation of the type the count rate meter and the GM probe selected were designed to measure must be used to determine proper operation of this instrument 4 2 Audio If the instrument is equipped with this option an internal speaker will produce an audible click for each detector pulse This speaker is controlled by a panel mounted on off switch labeled audio An audible alarm sounds when the meter is approximately 30 or more above full scale on any range This over range alarm can be defeated by turning off an internal on off switch located on the main circuit board The over range alarm functions only when the panel mounted Audio Control Switch is in the off position and the internal switch is on When the speaker control is in the on position the over range alarm is defeated Surveyor 200IM Portable Survey Meter 1012 0 U 0798 Page 11 User s Manual 5 0 Hardware Description 5 1 Circuit Description The electronic circuitry in the Bicron surveyor 200 is contained on three interconnected printed circuit boards Modern solid state integrated circuitry is used throughout The major components are 1 The high voltage power supply which is a feedback regulated electronically stabilized supply for the GM tube potential Additional circuitry provides an HV test readout on the meter scale 2 The count rate meter which is a linear charge pump rate meter that converts the GM tube pulses to an exposure rat
16. le Survey Meter 1012 0 U 0798 Page 3 User s Manual TABLE OF CONTENTS Section Page BICRON NE Warranty Statement nunaa annaua 5 Procedures and Cautions A asa 6 1 0 Introduction 1 1 General Description ein ekle ak ein ekle 7 1 2 Specifications hag Yele e e ll e SAS a e AUS MN 7 2 0 Battery Installation 9 Zi Procedure yle ER A R 9 eee NI ge a ll ela ae lar a akya 9 3 0 High Voltage Test oi A AAA a Z 9 4 0 Operation 41 Radiation Measurements 10 42 AO ea Kl lk illa KA a a Sl 10 5 0 Hardware Description A Aisa AA G N GR 11 5 2 GM Tube Probes 0 0 00 ce ees 11 6 0 Calibration A e e deki 12 6 1 Standard mMR H ooooooooooo ees 12 6 2 Op onal CPM Calibraion 12 Appendices A QC Acceptance Procedure Number 1012937 A 1 B SuggestedSparePartslist A 5 C Parts List Number 1012917 A 7 D DIA WINE Sets 2 sige sues ale e e Esin ein ia als A 9 Surveyor 200IM Portable Survey Meter Page 4 1012 0 U 0798 User s Manual BLANK PAGE Surveyor 200IM Portable Survey Meter 1012 0 U 0798 Page 5 User s Manual BICRON NE WARRANTY STATEMENT COVERING PORTABLE MONITORS Instruments and options manufactured by BICRON NE are warranted against defects in materials and workmanship for a period of two years from the date of shipment unless otherwise agreed upon by BICRON NE and the customer in
17. n the ionized state The small amount of halogen gas in the gas mixture quenches the flow of ions suppressing further electron avalanches until another nuclear particle or ray enters the tube This flowing and quenching results in a rapid pulse or surge of current in the external circuit The number of pulses per minute is approximately proportional to the radiation exposure rate The meter suitably connected to the tube indicates the exposure rate or counts per minute depending on probe used on a calibrated scale Surveyor 200IM Portable Survey Meter Page 12 1012 0 U 0798 User s Manual 6 0 Calibration This section provides a general description of calibration conditions Detailed calibration procedures are part of the Q C Acceptance Procedure in Appendix A 6 1 Standard mR H The instrument is normally factory calibrated with a specific model SWGM side wall GM or EWGM end window GM probe using C s gamma rays Recalibration is required a after servicing b if the GM probe is replaced and at regular intervals specified by the appropriate regulatory agencies The SWGM with shield closed or EWGM probe is placed in a known radiation field with the axis of the probe perpendicular to the beam Individual calibration controls are provided for each range and are used to adjust the meter reading to correspond to the known exposure rate The locations of these controls are shown on a label on the case bottom
18. pproximately twice the operational hours of one battery Only one battery is needed to power the instrument however 2 2 Test To check the condition of the battery turn the Control Switch to the bat position Figure 2 If the battery has sufficient charge the meter will read within the bat ok range Figure 1 1200 cpm 990 2000 Figure 1 Surveyor 200 Meter Scale 3 0 High Voltage Test To check the high voltage setting turn the Control Switch to the HV position Figure 2 If the high voltage is correctly set the meter will read within the HV ok range Figure 1 audio Figure 2 Surveyor 200 Control Panel Surveyor 200IM Portable Survey Meter Page 10 1012 0 U 0798 User s Manual 4 0 Operation 4 1 Radiation Measurements 1 Select a GM probe appropriate to the survey situation and attach it to the instrument via a cable connection is so marked 2 Turn the Selector Switch to one of the linear ranges X1 X10 or X100 3 Multiply the meter scale reading by the selector position to obtain the reading For example a scale reading of 400 with the Control Switch set to X10 is 4 000 cpm 4 Read the mR h scale the top meter scale when using a SWGM or EWGM probe calibrated with the unit for Cs standard calibration The serial number of the instrument and the probe appear on the calibration certificate CAUTION An external source of ion
19. throughout this and all BICRON NE manuals certain writing conventions have been followed for safety warnings They are divided into three categories and defined as follows DANGER indicates an imminently hazardous situation which if not avoided will result in death or serious injury DANGER NOTICES ALWAYS APPEAR IN BOLD ITALICIZED UPPER CASE LETTERS WARNING indicates a potentially hazardous situation which if not avoided could result in death or serious injury WARNING NOTICES ALWAYS APPEAR IN UPPERCASE BOLD LETTERS CAUTION indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury It may also be used to alert against unsafe practices CAUTION notices always appear in bold italicized letters The definition of these safety warnings is according to ANSI Z535 4 The style of the warnings bold italicized etc is BICRON NE s In addition to the above we have added the following warning NOTE indicates a situation which has the potential for erroneous data collection loss of electronic data or damage to equipment but which does not directly affect the safety of the operator with respect to this product The responsibility for any safety consequences as a result of erroneous data lies solely with the operator NOTE notices always appear in italics Surveyor 200IM Portable Survey Meter Page 2 1012 0 U 0798 User s Manual BLANK PAGE Surveyor 200IM Portab
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