Mirion Technologies DRM, DRM-1, DRM-1D, DRM-2, DRM-2D Installation Manual

OPERATION & CALIBRATION MANUAL

DRM Family of
Wireless

DRM-1, DRM-1D, DRM-2, DRM-2D, DRM-2E, DRM-2H, DRM-2EN

Data Radiation Monitors

Document # 15-00044
Revision 10
December 2015

All information in t hi s document is the exclusi ve propert y of Mirion T echnologies (MGPI), Inc. and i s not to be disclosed, reproduced, or used except
as authorized in writing by Mirion Technologies (MGPI), Inc.

December 2015

(formatting) . Changed title.

feature for the DRM-1D

Better description of DRM-1D calibration, Section 9.1

editing through-out.

shots of MMV f or threshold settings and instructions

section.

DRM-2 and DRM-2E.

15-00044

Revision 10

Revision Log

Revision # Date

0

1

2

3

4 July 2007 ALL Inclusion of DRM-2/2D, Power Saving Mode update,

July 2004 N/A Original issue.

March 2005

May 2005 6,11-13, and

October

2006

Revised

Pages

ALL

30

15

Comments

Added DRM-1D information, specifications, calibration,
FCC information about WRM2, instructions on using
MMV software (removed AMPView), and section for
optional display unit and corrected typographic errors

Added outline drawings for the DRM-1/D and
information about the automat ic background subtraction

Added note about dipswitch settings for field use and
calibration, section 3.22

Environmental & Solar Enclosure configurations, minor

5 April 2008 ALL Added new features with firmware 071111 for DRM-1/2

for 4 threshold settings and select able using the ‘ACK’
button on the DRM-1/2 display. Added new screen

6 Sept. 2008 Page 11 Added WRM2 Radio information in DRM Specifications

7 Dec. 2011 All

All

Cover

6

Changed RMV references to MMV.
Included references to DRM-2H
Inserted picture of DRM-2E.
Insert a paragraph noting the similarities between the

All information in t hi s document is the exclusi ve propert y of Mirion T echnologies (MGPI), Inc. and i s not to be disclosed, reproduced, or used except
as authorized in writing by Mirion Technologies (MGPI), Inc.

December 2015

Revised

Pages

7

10

Noted display and alarm properties for DRM-1D/2D

8

Jan. 2012

7

42

Changed DRM-2 and DRM-2H measuring ranges.

Changed DRM-2 and DRM-2H maximum ranges.

15-00044

Revision 10

Revision Log (cont’d)

Revision # Date

(cont’d)

9-12

11

12-13
13-14

19-22

24
25

29
34

42-43

44

53

59-62

68

Comments

Specifications refer to 2D only.
Added accessory details.
Inserted DRM-2 Environmental Characteristics and

Dimensions.
Added specifications for the DRM-2H.
Added specifications regarding optional External Display

& Alarm.
Added drawings for the DRM-2, DRM-2H, and DRM-2E.
Added response time table for DRM-2H.
Inserted picture of DRM-2E with RTM-9135 external

display & alarm.
Added automatic range switching details for DRM-2H.
Added external display measurements for the DRM-2H.
Added DRM-2H calibration ranges.
Combined sections 9 and 10.
Added DRM-2H calibration tables.
Added CPS to mR/h conversion tables.
Updated Electronic Schematics
Removed Section 14.

All information in t hi s document is the exclusi ve propert y of Mirion T echnologies (MGPI), Inc. and i s not to be disclosed, reproduced, or used except
as authorized in writing by Mirion Technologies (MGPI), Inc.

10

12, 34

24

Changed DRM-2 measuring and display range to 999E.
Changed DRM-2H measuring and display range to

9,999 R/h.
Changed DRM-2H Fast Response Time setting to 9,999

R/h.

December 2015

9

April 2012

9

Defined measurement terminolog y.

15-00044

Revision 10

10

Dec 2015

9, 10, 12, 13

11

13,31,43

13, 35

31

8
14-15
55-59

Added reporting ranges.
Change DRM-2 highest measurement range.
Changed low end of DRM-2H measurement range to

0.05 mR/h and calibration points to low end fields to 0.05
mR/h.

Changed DRM-2H low end display range to 0.001 R/h.
Changed DRM-2H overflow to 10,000 R/h.
Added a brief introduction to the DRM-2EN.
Added DRM-2EN technical specifications
Added DRM-2EN calibration instructions

All information in t hi s document is the exclusi ve propert y of Mirion T echnologies (MGPI), Inc. and i s not to be disclosed, reproduced, or used except
as authorized in writing by Mirion Technologies (MGPI), Inc.

15-00044

December 2015

Revision 10

WRM-2 FCC COMPLIANCE

This device complies with Part 15 of the FCC rules. Operation is subject to
the following conditions: (1) this device may not cause harmful interference and (2) this
device must accept any interference received, including interference that may cause
undesired operation, FCC ID Number: ‘our9xstream’.

ANTENNA WARNING

This device has been tested with Reverse Polarity SMA and MMCX
connectors with the antennas that are supplied with the equipment. When integrated in the
OEM product, these fixed antennas require installation preventing end users from replacing
them with non-approved antennas. Any antennas not supplied by Mirion (MGPI)
Technologies must be tested to comply with FCC Section 15.203 for unique antenna
connectors and section 15 emissions.

FCC QUALIFICATIONS
Important: The WRM2 radio modules have been certi fied by the FCC for integration

into OEM products without any further certifications (a s per FCC section

2.1091). Changes not expressly approved by Mirion (MGPI) Technologies
could void the user’s authority to operate this equipment.

Note: The WRM2 System utilizes a proprietary communication (WRM) protocol

and specific firmw are identification for each component a nd i s configured
for optimal performance.

Operation of the WRM2 system in a configuration not consiste nt with

MIRION settings, or modifications to hardware and firmware may result in
degraded system performance and loss of warranty.

CAUTION: Only the power supplies and batteries specified by MIRION should be used

with all DRM components. Non-approved power sources can resul t i n
component damage or personal injury. Contact MIRION for additional
information!

All information in t hi s document is the exclusi ve propert y of Mirion T echnologies (MGPI), Inc. and i s not to be disclosed, reproduced, or used except
as authorized in writing by Mirion Technologies (MGPI), Inc.

15-00044

December 2015

Revision 10

Table of Contents

1. THE DRM FAMILY ....................................................................................................................... 8

2. DRM SPECIFICATIONS ............................................................................................................... 9

2.1. DRM-1 GENERAL (GM TUBE) ........................................................................................................ 9

2.2. DRM-1D/2D CESIUM IODINE (TL) SPECIFICATIONS ..................................................................... 10

2.3. DRM-2 (GM TUBE) SPECIFICATIONS ............................................................................................ 11

2.4. DRM-2H SPECIFICATIONS ............................................................................................................. 13

2.5. DRM-2EN SPECIFICATIONS .......................................................................................................... 14

2.6. OPTIONAL DRM EXTERNAL DISPLAY & ALARM ........................................................................... 16

2.7. WRM2 RADIO TRANSMITTER CHARACTERISTICS FOR THE DRM .................................................. 16

2.8. DRM-1 OUTLINE DRAWINGS ........................................................................................................ 17

2.9. DRM-1D OUTLINE DRAWINGS ..................................................................................................... 20

2.10. DRM-2 OUTLINE DRAWINGS ..................................................................................................... 21

2.11. DRM-2H OUTLINE DRAWINGS .................................................................................................. 23

2.12. DRM-2E OUTLINE DRAWINGS .................................................................................................. 24

2.13. OVER THE AIR COMMUNICATIONS ............................................................................................. 25

2.14. RESPONSE TIMES FOR THE GM TUBES ....................................................................................... 25

2.15. DRM-1/2D RESPONSE TIMES FOR THE CSI (TL) DETECTOR ...................................................... 26

3. OPERATING INSTRUCTIONS .................................................................................................. 26

3.1. PREPARATION FOR USE .................................................................................................................. 26

3.2. STARTING-UP ................................................................................................................................. 27

3.3. METER CONNECTORS .................................................................................................................... 28

3.4. POWER SUPPLY & BATTERY .......................................................................................................... 29

4. GENERAL FUNCTIONS ............................................................................................................. 30

4.1. DIPSWITCH SELECTOR ................................................................................................................... 30

4.2. DIPSWITCH POSITIONS ................................................................................................................... 30

4.3. DRM OPTIONAL EXTERNAL DISPLAY & ALARM ........................................................................... 35

4.4. BATTERY REPLACEMENT ............................................................................................................... 36

5. COMMUNICATION .................................................................................................................... 37

5.1. COMMUNICATION .......................................................................................................................... 37

5.2. PROTOCOL ..................................................................................................................................... 37

6. COMMUNICATION PROTOCOL ............................................................................................. 37

6.1. SET METER PARAMETER VIA THE PC ............................................................................................ 39

7. SETTING METER PARAMETERS USING THE MMV SOFTWARE ................................ 41

7.1. SET PC COMMUNICATION PARAMETERS ......................................................................... 41

7.2. SET & DISPLAY METER PARAMETERS .............................................................................. 41

7.3. MMV OPERATING INSTRUCTIONS: ..................................................................................... 42

7.4. AUTOMATIC BACKGROUND OPTIONS: ............................................................................. 43

All information in t hi s document is the exclusi ve propert y of Mirion T echnologies (MGPI), Inc. and i s not to be disclosed, reproduced, or used except
as authorized in writing by Mirion Technologies (MGPI), Inc.

15-00044

December 2015

Revision 10

8. CALIBRATION SUMMARY FOR THE DRM-1/2................................................................... 44

9. CALIBRATION GUIDELINES................................................................................................... 46

9.1. SUMMARY FOR THE DRM-1/2D .................................................................................................... 46

9.2. CALIBRATION PROCEDURE FOR THE DRM-1/2, DRM-2H, AND DRM-1/2D ................................. 46

9.3. OPERATING INSTRUCTIONS ............................................................................................................ 47

9.4. TEMPLATE & PARAMETERS SETUP ................................................................................................ 48

9.5. STARTING-UP THE CALIBRATION & LINEARITY PROCESS .............................................................. 49

9.6. CALIBRATION ................................................................................................................................ 50

9.7. LINEARITY ..................................................................................................................................... 51

9.8. SAVE, LOAD AND PRINT CALIBRATION AND LINEARITY CERTIFICATE ........................................... 53

9.9. CPS TO MR/H CONVERSION TABLES ............................................................................................. 54

9.10. CALIBRATING THE DRM-2EN ................................................................................................... 55

10. UPGRADING THE DRM FIRMWARE ..................................................................................... 58

11. DRM - LIST OF ELECTRONIC SCHEMATICS ..................................................................... 64

12. DRM - ENVIRONMENTAL ENCLOSURE CONFIGURATION .......................................... 71

All information in t hi s document is the exclusi ve propert y of Mirion T echnologies (MGPI), Inc. and i s not to be disclosed, reproduced, or used except
as authorized in writing by Mirion Technologies (MGPI), Inc.

December 2015 Page 8 of 73

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1. The DRM Family

1.1. General Description

The Data Radiation Monitors, DRM-1/2 and DRM-2H, are auto switching two GM-tube based dose
rate meters, and the DRM-1/2D is a sensitive CsI (Tl) scint illated coupled t o a PMT. The DRM-1,
DRM-2, and DRM-2H are dose rate meters for detect ion, using state-of-the-art micropr ocess or -based
technology and combined with telemetry using the WRM2 900 MHz or 2.4 GHZ FHSS radio. The DRM
is designed for highly stable and accurate dose rate measurements fr om gamma radiation. The DRM­1/2 (GM) measuring range is from 0.05 mR/h up t o 999 R/h. The DRM-2H measuring rang e is from .05
mR/h up to 9,999 R/h, and the DRM-1/2D’s measuring range is f r om 0.001 mR/h up to 10 mR/h.

Note: The DRM-2E is similar t o the DRM-2, with the only difference being that the DRM-2E has a
waterproof external probe, compared with the internal pr obe of the DRM-2. Thus, unless specifically
noted, any properties or directions included for the DRM-2 apply to the DRM-2E as well.

The DRM-2EN is an auto switching neutron based dose rate meter for detection, using stat e-of-the-art
microprocessor-based technology and combined with telemetr y using the WRM2 900 MHz or 2.4 GHZ
FHSS radio. The DRM is designed for highly stable and accurate dose rate m easurements from
neutron radiation from back ground (typical 0.05 mrem/h) to 1 rem/h. The external neutron detector is
connected to the DRM using the standard 30 ft. AMP cable.

The DRM is a lightweight and compact instrument with sophisticated software offering special f eatures
and optimal performance f or t elem et r y data. The wide dynamic range is obtained by the DRM-1/2 and
DRM-2H’s two GM-Tubes with automatic range switching and an automatic dead time correction,
according to the preset calibration. The DRM-1/2D’s sensitive range is obtained by CsI (Tl) scintillator
(30*30mm) coupled to PMT and an automatic dead time cor r ec t ion and back ground subtraction,
according to the preset calibration. A spec ial averaging function smoothes the data reading and
maintains fast response time, while keeping t he s t andar d deviation at a m inimum for the DRM-1/2,
DRM-2H, and DRM-1/2D.

Software is used to configure (MMV) and calibrate (RMC) the DRM family of detectors.
An automatic self-diagnostic proc edure c ontinuously checks bot h electronics and det ector s and report s

any case of detector failure.
The DRM may be used in the following ways:

• by connecting the meter to a PC

• by connecting the meter to a DDC-16/AM-16 Area Monitor (wired)

• by using the internal W RM2 FHSS radio to transm it dat a

• by connecting the meter to an external WRM transmitter (wireless)

• by using an internal or externally connected network adapter

The meter includes four boards: HV board, CPU boar d, WRM2 radio and the board for t he dual GM­Tube detectors or a cesium iodine detector. A built-in RS-232 is the connect ion used for calibration and
configuration. A custom connector is needed when using the WRM external transmitter . The WRM2
FHSS radio is already included in the DRM-1/2(H) package and a base station (MIRION P/N: WR2 -

9001) is needed for reception of t elemetry data. A second DB-9 female connector is available for an
optional alarm and display unit for all DRM instruments.

All information in t hi s document is the exclusi ve propert y of Mirion T echnologies (MGPI), Inc. and i s not to be disclosed, reproduced, or used except
as authorized in writing by Mirion Technologies (MGPI), Inc.

December 2015 Page 9 of 73

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1.2. Applications for GM-Tube (DRM-1, DRM-2, DRM-2H) and

CsI (DRM-1D, DRM-2D) Detectors

 Perimeter & Boundar y Surveillance
 Vehicle Access Points
 Turnst ile ent r ies
 Collection of Survey Data for Real-time Mapping & Surveillance Software
 General Area Monitoring
 Hospital Emergenc y Room Entr ances and CBRNE storage areas
 Response vehicles

 Event Monitoring

1.3. Definitions

The following terms are used in describing the measurement functionality of the DRM devices:

 Measurement Range: The limits to what energy levels the DRM can reliably and accurately

read.

 Display Range: The display range for the front LCD display of the DRM-2 series.
 Reporting Range: The range for what the DRM can report to telemetry software (e.g.,

Soteira and WinWRM2).

2. DRM Specifications

2.1. DRM-1 General (GM Tube)

• Detector:

 GM tube ZP-1301 (or equivalent) - high range
 GM tube ZP-1201 (or equivalent) - low range
 Optional GM tube ZP-1300 non-energy compensated – low range

• Measurement Ranges:

 0.05 mR/h to 1,000 R/h (0.5 µSv/h to 10 Sv/h)
 Automatic switching between the two GM tubes at

600 mR/h and 800 mR/h

• Reporting Range:

 0.001 mR/h to 999 R/h

• Accuracy:

 ±10 % of reading, within the measuring r ange

• Energy Response (137Cs):

 ±20 % at 70 keV to 2 MeV

All information in t hi s document is the exclusi ve propert y of Mirion T echnologies (MGPI), Inc. and i s not to be disclosed, reproduced, or used except
as authorized in writing by Mirion Technologies (MGPI), Inc.

December 2015 Page 10 of 73

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• Sensitivity (137Cs):

 17 cps/mR/h (low range)
 0.3 cps/mR/h (high range)

• Power Source:

 External power supply and battery backup
 External power supply: Input 120-250 Vac, Output 6 Vdc to 15 Vdc with locking

connector

 Battery back-up: Three (3) 1.2v NiMH 2100mA rechargeable
 Battery operating lifetime: Up to 12 hours of continuous operation
 Power Saving Mode On/Off using Meter View Software

• Temperature Range:

 Operation: -10°C to +50°C (15 °F to 122°F)
 Storage: -20°C to +60°C (-5°F t o 140°F)

• Humidity Range:

 10% to 95% RH (non condensing)
 Enclosure Material Aluminum

• Dimensions:

 7” L x 2.5” D x 4.25” W
 Weight: 907 g (2 lbs)

• Optional Accessories:

 External Display & Alarm (see Section 2.4)
 Magnet Mounting Attachments

2.2. DRM-1D/2D Cesium Iodine (TL) Specifications

• Detector:

 CsI (Tl) (30 x 30 mm) crystal optically coupled to PMT with 0.5 mm aluminum housing

and solid mu metal shield. W it h optional automatic background subtraction using the
MMV software.

• Measurement Range:

 1 µR/h to 9,999 µR/h (0.001 mR/h to 9.999 mR/h)
 Overflow Alarm for reading > 9999 µR/h
 Overload for field > 1 R/h
 Sensitivity: 6.8 cps/µR/h for 137-Cs
 Optional : background subtrac t ion via the MMV software

• Display Range (DRM-2D only):

 0.01 mR/h to 9,999 mR/h

• Reporting Range:

 0.001 mR/h to 9.999 mR/h

All information in t hi s document is the exclusi ve propert y of Mirion T echnologies (MGPI), Inc. and i s not to be disclosed, reproduced, or used except
as authorized in writing by Mirion Technologies (MGPI), Inc.

December 2015 Page 11 of 73

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• Dimensions:

 DRM-1D: 7" L x 3.5" D x 4.25" W
 DRM-2D: 10.25” L x 4.28” D x 4.88” W

• Display – LCD Readout (DRM-2D only):

 4 digits for accurate and easy display
 Detector failure
 Low battery
 Overflow
 4 Threshold Settings

• Audio (DRM-2D only):

 Two internally mounted piezo-electric elements (used for alarm functions)

• Accuracy (137Cs):

 ±10 % of reading, within the measuring r ange

• Energy Response:

 45 KeV to 2 MeV

• CsI Sensitivity (137Cs):

 6.8 cps/µR/h

• Power Source:

 External power supply and battery backup
 External power supply: Input 120-250 Vac, Output 9 to 15 Vdc with locking connector
 Battery back-up: Three (3) 1. 2v NiMH rechargeable AA batteries
 Battery operating lifetime: Up t o 8 hour s of continuous operation (with optional Alarm

and Display Unit: 4 hours)

 Power Saving Mode On/Off using Meter View Software

• Temperature Range:

 Operation: -10°C to +50°C (15°F to 122°F)
 Stor age: -20°C to +60°C (-5°F to 140°F)

• Humidity Range:

 10% to 95% RH (non condensing)
 Enclosure Material Aluminum

• Optional Accessories:

 External Display & Alarm (see Section 2.4)
 Magnet Mounting Attachments

2.3. DRM-2 (GM Tube) Specifications

• Detector:

 GM tube ZP-1301 (or equivalent) - high range
 GM tube ZP-1201 (or equivalent) - low range
 Optional GM tube ZP-1300 non-energy compensated – low range

All information in t hi s document is the exclusi ve propert y of Mirion T echnologies (MGPI), Inc. and i s not to be disclosed, reproduced, or used except
as authorized in writing by Mirion Technologies (MGPI), Inc.

December 2015 Page 12 of 73

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• Measurement Ranges:

 0.05 mR/h to 1,000 R/h (0. 5 µSv/h to 10 Sv/h)
 Automatic switching between the two GM tubes at

600 mR/h and 800 mR/h

• Display Range:

 0.01 mR/h to 999E (999,000 mR/h)

• Reporting Range:

 0.001 mR/h to 999 R/h

• Accuracy:

 ±10 % of reading, within the measuring r ange

• Energy Response (137Cs):

 ±20 % at 70 keV to 2 MeV

• Sensitivity (137Cs):

 17 cps/mR/h (low range)
 0.3 cps/mR/h (high range)

• Power Source:

 External power supply and battery backup
 External power supply: Input 120-250 Vac, Output 6 Vdc to 15 Vdc with locking

connector

 Battery back-up: Three (3) 1.2v NiMH rechargeable AA batteries
 Battery operating lifetime: Up to 12 hours of continuous operation
 Power Saving Mode On/Off using Meter View Software

• Display – LCD Readout:

 4 digits for accurate and easy display
 Detector failure
 Low battery
 Overflow
 4 Threshold Settings

• Audio:

 Two internally mounted piezo-electric elements (used for alarm functions)

• Measurement Units:

 mR/h

• Controls:

 Alarm Acknowledgment push-button
 DIP Switches for functionality

• Temperature Range:

 Operation: -10°C to +50°C (15 °F to 122°F)
 Storage: -20°C to +60°C (-5°F t o 140°F)

All information in t hi s document is the exclusi ve propert y of Mirion T echnologies (MGPI), Inc. and i s not to be disclosed, reproduced, or used except
as authorized in writing by Mirion Technologies (MGPI), Inc.

December 2015 Page 13 of 73

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• Humidity Range:

 10% to 95% RH (non condensing)
 Enclosure Material Aluminum

• Environmental Characteristics:

 DRM-2E External Probe: Waterproof in up to 50 feet (15.24 m) of water.

• Dimensions:

 Control Unit: 10.25” L x 4.28” D x 4.88” W
 External Probe (DRM-2E only): 9.5” L x 1.75” W attached to CU with ≤300′ AMP cable.

• Optional Accessories:

 External Display & Alarm (see Section 2.4)
 Magnet Mounting Attachments

2.4. DRM-2H Specifications

• Detector:

 GM tube 4G60M (or equivalent) - high r ange
 GM tube ZP-1201 (or equivalent) - low rang e
 Optional GM tube ZP-1300 non-energy compensated - low range

• Measurement Ranges:

 0.05 mR/h to 9,999 R/h (0.5 µ Sv/h to 99.99 Sv/h)
 Automatic switching between the two GM tubes at

1,000 mR/h and 1,500 mR/h

• Display Range:

 0.001 R/h to 9,999 R/h

• Reporting Range:

 0.001 mR/h to 9,999 R/h (0.01 µSv/h to 99.99 µSv/h)

• Accuracy:

 ±10 % of reading, within the measuring r ange

• Energy Response (137Cs):

 ±20 % at 70 keV to 2 MeV

• Sensitivity (137Cs):

 17 cps/mR/h (low range)
 77 c ps/R/h (high range) (DRM-2H)

• Power Source:

 External power supply and battery backup
 External power supply: Input 120-250 Vac, Output 6 Vdc to 15 Vdc with locking

connector

 Battery back-up: Three (3) 1.2v NiMH rechargeable AA batteries
 Battery operating lifetime: Up to 12 hours of continuous operation

All information in t hi s document is the exclusi ve propert y of Mirion T echnologies (MGPI), Inc. and i s not to be disclosed, reproduced, or used except
as authorized in writing by Mirion Technologies (MGPI), Inc.

 Power Saving Mode On/Off using Meter View Software

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• Display – LCD Readout:

 4 digits for accurate and easy display
 Detector failure
 Low battery
 Overflow
 4 Threshold Settings

• Audio:

 Two internally mounted piezo-electric elements (used for alarm functions)

• Measurement Units:

 R/h

• Controls:

 Alarm Acknowledgment push-button
 DIP Switches for functionality

• Temperature Range:

 Operation: -10°C to +50°C (15 °F to 122°F)
 Storage: -20°C to +60°C (-5°F t o 140°F)

• Humidity Range:

 10% to 95% RH (non condensing)
 Enclosure Material Aluminum

• Environmental Characteristics:

 DRM-2E External Probe: Waterproof in up to 50 feet (15.24 m) of water.

• Dimensions:

 Control Unit: 10.25” L x 4.28” D x 4.88” W

• Optional Accessories:

 External Display & Alarm (see Section 2.4)
 Magnet Mounting Attachments

2.5. DRM-2EN Specifications

• Detector:

 PRESCILA proton recoil scintillator

• Neutron Energy Response

 Thermal to 100 MeV

• Measurement Range:

 0.05 mrem/h to 1 rem/h

• Sensitivity:

 approximately 350 cpm/mrem/hr (

241

AmBe)

All information in t hi s document is the exclusi ve propert y of Mirion T echnologies (MGPI), Inc. and i s not to be disclosed, reproduced, or used except
as authorized in writing by Mirion Technologies (MGPI), Inc.

December 2015 Page 15 of 73

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• Angular Dependence:

 within 15% over wide range of energies

• Gamma Rejection

 0 – 100 mrem/h ɣ: ≤ 2 mrem/h neutron displayed
 100 mrem/h – 200 mrem/h ɣ: ≤ 3 mrem/h neutron displayed

• Operating Voltage:

 typically 500-700 volts

• Connector

 Ikelite 5 pin female

• Detector Cable Length

 10 – 100 feet

• External Probe Construction:

 aluminum housing with black powder-coat finish and an ergonom ic foam grip

• Display – LCD Readout:

 4 digits for accurate and easy display
 Detector failure
 Low battery
 Overflow
 4 Threshold Settings

• Audio:

 Two internally mounted piezo-electric elements (used for alarm functions)

• Measurement Units:

 mrem/h

• Controls:

 Alarm Acknowledgment push-button
 DIP Switches for functionality

• Temperature Range:

 Operation: -10°C to +50°C (15 °F to 122°F)
 Storage: -20°C to +60°C (-5°F t o 140°F)

• Dimensions:

 10.125 x 4.25 x 4.25 in. (25.7 x 10.8 x 10.8 cm) (H x W x L)

• Weight:

 5 lbs (2.2 kg)

• CE Certifie d

 Yes

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as authorized in writing by Mirion Technologies (MGPI), Inc.

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2.6. Optional DRM External Display & Alarm

• Display Range:

 Same as parent DRM

• Power Source:

 DRM via a cable connection with a D-type 9 pin connector

• Display – LCD Readout:

 4 digits for accurate and easy display
 4 Threshold Settings

• Audio:

 One externally mounted piezo-electric element (used f or alar m functions)

• Measurement Units:

 mR/h

• Controls:

 Alarm Acknowledgment push-button

• Temperature Range:

 Operation: -10°C to +50°C (15 °F to 122°F)
 Storage: -20°C to +60°C (-5°F to 140°F)

• Humidity Range:

 10% to 95% RH (non condensing)
 Enclosure Material Aluminum

• Dimensions:

 Control Unit: 8.56” L x 2.4” D x 4.4” W

2.7. WRM2 Radio Transmitter Characteristics for the DRM

 10.25” L x 4.28” D x 4.88” W
 Transmit power output 100 mW (900 MHz), 50 mW ( 2.4 GHz), 3.5 mW (868 MHz)
 Receiver sensitivity -110 dBm (900 MHz) and –105 dBm (2.4 GHz)
 868 MHz, 900 MHz or 2.4 GHz spread spectrum hopper (FHSS)
 Range for the 900 MHz unit 1500’ (500 m) indoors-industrial environment, 2 m iles ( 3. 2

km) outdoors RF line-of-sight with standard dipole antenna, up to 20 miles (32 km) with
high gain directional antenna

 Range for the 2.4 GHz unit 600’ (200 m) indoor s, 1.5 (2.4 km) miles outdoors with RF

line-of-sight w/ dipole antenna, up to 10 m iles (16 km) w/ high gain antenna

 Over the air data stream at 19,200 BAUD
 Addressable from 0 to 65,000
 FCC approved, IC Certified, 2.4 GHz and 868 MHz are CE marked
 Programmable transmission intervals from 1 sec to 16 sec.

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December 2015 Page 17 of 73

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2.8. DRM-1 Outline Drawings

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DRM-1 Outline Drawings (continued)

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DRM-1 Outline Drawings (continued)

DRM-1 Inside View

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2.9. DRM-1D Outline Drawings

DRM-1D Inside View

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2.10. DRM-2 Outline Drawings

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DRM-2 Outline Drawings (continued)

TOP VIEW

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2.11. DRM-2H Outline Drawings

Note: Top and Bottom views of the DRM-2H are the same as the Top and Bottom views of the

DRM-2 (please see Section 2.9).

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2.12. DRM-2E Outline Drawings

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December 2015 Page 25 of 73

Table 1
Response Time for Small Changes

Table 2
Fast Response Time

Radiation Field
[mR/h]

Response
[sec.]

Radiation field
to/above

Response
[sec.]

< 0.5

45 0.05

1.0

≤ 2

0.5 - 1.5

30 0.5

3.0

≤ 2

1.5 - 2.5

20 1.5

5.0

≤ 2

2.5 - 6

10 2.5

12

≤ 2

6 - 12

6 6

20

≤ 2

12 - 24

4 12

40

≤ 2

20 - 60

3 20

60

≤ 2

60 - 800

2 1 R/h

2 R/h

≤ 2

0.6 - 1.2 R/h

5 2 R/h

2.6 R/h

≤ 2

1.2 - 2 R/h

4

2 - 3 R/h

3 3 - 10 R/h

2 – 3

> 10 R/h

≤ 2

15-00044-10

2.13. Over the Air Communications

900 MHz or 2.4 GHz FHSS (Frequency Hopping Spread Spectrum) Radios with External Antenna
(WRM

2

system) – Base receiver required for use with WRM2 receiver.

2.14. Response Times for the GM Tubes

2.14.1. DRM-2 (ZP1201 & ZP1301):

Range

If the radiation field measur ed by the m et er incr eas es s ig nificantly, the response time will be ≤ 2 sec.
as seen in Table 2. In other cases the response t im e is accor ding to Table 1.

For example:

• For a radiation field increase from 2.5 mR/h to 12 mR/ h, the response time will be ≤ 2 sec.

• For radiation field fluctuations between 2.5 mR/h and 6 mR/h, t he r espons e t im e will be 10

Time

[mR/h] from

Time

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sec.

December 2015 Page 26 of 73

Table 1
Response Time for Small Changes

Table 2
Fast Response Time

Radiation Field
[mR/h]

Response
[sec.]

Radiation field
to/above

Response
[sec.]

0.6

70 0.1

0.7

≤ 2

1.6

40 1

2.8

≤ 2

2.3

30 10

16

≤ 2

5.9

13 100

118

≤ 2

12

10 250

1500

≤ 2

24 7

Switch to 4G60M; R/h

35 5

1.0

1.8

≤ 2

58 4

10

12.6

≤ 2

175

3 50

56

≤ 2

175-1500

2 >56

9999 R/h

≤ 2

Switch to 4G60M; R/h

1.5

10 5.2 7

7.8 5

13 4

38 3

> 38 R/h

2

15-00044-10

2.14.2. DRM-2H (ZP1201 & 4G60M):

Range

Time

[mR/h] from

Time

2.15. DRM-1/2D Response Times for the CsI (TL) Detector

The instrument’s response t im e is less t han 2 sec onds once the radiation intensity at the reference
point increases or decreases by a factor of 10. e.g. 0.001 to 0. 01 m R/ h ( 1µR/h t o 10µR/h).

3. Operating Instructions

3.1. Preparation for Use

Remove the instrument from t he shipping c ont ainer and check for any physical damage. In the case of
damage, report it to t he car r ier and contact Mirion Technologies (MGPI).

Caution: Do not attempt to install or operate damaged equipment since safety and
performance may be affected.

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3.2. Starting-up

3.2.1. Connect the antenna to the WRM2 PRSMA connector located on the top of the enclosure. The antenna is only needed when transmitting data over-the-air.

3.2.2. Switch dipswitch 3, for data output from the WRM2 radio, to the ON position or
dipswitch 5 & 6 to the ON position when programming the internal WRM2 radio See
“Wireless Remote Monitoring Operating Manual”, 15-00043 for configuring the WRM2
radio.

Note: Ensure dipswitches 1,2,3,7 and 8 are in the ON position when deploying the unit

for field use. Dipswitch 4 must be in the OFF position at on times for field use
and calibration.

3.2.3. Switch dipswitch 7&8 to the ON position to engage the batt er y back up

3.2.4. Connect the external power supply to the locking miniature power supply connector

3.2.5. Connect external WRM transmitter if used and ensure that the baud r ate for the DRM
and the WRM External Transmit t er are set to 300 bps. The interval level for t he DRM
needs to be set to ZERO (0), using MMV, so that the WRM transmitter can request t he
data from the device.

Note: By engaging the battery or the external power supply, the meter will start

operating. The unit is not supplied with an On-Off switch.

3.2.6. (Firmware >= 071111 [MARCH 2008] and board updates) By pressing the “ACK”
button once on the DRM-1 external display or the DRM-2 will show the current threshold

rate setting,
time and so forth will show user preset threshold sett ings that were configured using
the MMV software. See section 4.2.10 for MMV software Dose Rate Threshold
settings. See section 4.2. 10 for more information on set up and us age

thr.0 then the rate sett ing i.e., 300. By pressing the ACK button a sec ond

ACK thr.0 = selected ACK thr.1 ACK thr.2 ACK thr.3 ACK thr.4

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Ground (-)

6 to 15v DC

1

Ground

2

1

9

Display data

3

15-00044-10

3.3. Meter Connectors

3.3.1. Connectors:

The DRM-1 contains three connectors:

1. 2.5 mm External power supply connector (type L712RA supplied by Switch craft, center
post is positive)

2. D-type 9 pin female for RS232 communication port

3. D-type 9 pin male for rem ot e display & alarm

5
7
2
3
4
9

/common

Rx
Tx
5v

2
3
4
5
6
7
8

Display clk
Ready
Alarm
5v
Ground /common

Ext DC
Battery backup

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December 2015 Page 29 of 73

2

3

1

1

D-type 9 pin female D-type 9 pin
female

Display & Alarm Unit Meter

15-00044-10

3.3.2. Ex t e rnal Connectors:

Meter to PC RS232 Cable

D-type 9 pin female D-type 9 pin male

Meter to External Display & Alarm Unit (lengh 25')

3
5

2
3
4
5
6
7
8
9

2
5

2
3
4
5
6
7
8
9

3.4. Power Supply & Battery

• External power supply type CINCON 418-TR1507-12 (15v) with locking plug (type 761K
Switchcraft - center positive)

• Input 120-250 VAC

• Output 15 VDC 1.6A

• The meter can be operated using DC power fr om 5 volt to 16 volt (0.7A)

• The meter is protected in case of reverse polarity

• Battery backup: 3 units of NiMH GP2100 type AA 1.2V, 2100mA

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4. General Functions

4.1. Dipswitch Selector

4.1.1. To set the dipswitch, unscrew two screws located at the meter front panel and remove the dipswitch cover.

4.1.2. The dipswitch (8 switches) is located on the meter’s fr ont panel. Using these dipswitches you can setup two functions:

• Communication mode, and;

• Connect-disconnect the backup batteries.

4.1.3. Dipswitches position: For the ON position, press the dipswitch downward.

4.1.4. The DRM has one UART (Universal Asynchrony Receive Transmit Port) and one communication RS232 port; the dipswitch position enables a selection of the communication mode

4.1.5. To set the dipswitch, unscrew two screws located at the meter front panel and remove the dipswitch cover.

4.2. Dipswitch Positions

4.2.1. 1&2 On

• Connects the DRM UART to the RS232 comm unicat ion por t via the D-t ype 9 pin f emale
connector

• Enables connection of the meter to PC for meter par am et er setting, calibration or download
the meter reading directly to PC, (Using MMV sof t ware for configuration and RMC for
calibration).

4.2.2. 3 On & 4 Off

• Connects the DRM UART to the inter nal wireless trans m it t er to send data reading via WRM2.
Switch 3 is for transmitting and Switch 4 is for receiving data.

4.2.3. 5&6 O n

• Connects the inter nal wireless transm it ter to the RS232 communication port via the D-type 9
pin female connector. See “Wireless Remote Monitoring 2 Operating manual, 15-00043” for
configuring the WRM2 radio.

• Enables the setting of internal wireless trans m it t er WRM2 parameters.

4.2.4. 7&8 O n

• Connects the inter nal t hr ee NiMHd rechargeable bat t er ies for back-up power if the external
power is disconnected

Note: If the external power supply is connected, the battery will be charged even though the

dip switches 7&8 are in the OFF position.

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December 2015 Page 31 of 73

LED

Color

Function

Ext. power

Red

External power supply > 7.5v – led on
No external power supply & no Battery – LED off

Tx.

Green

For each transmission sent, the led blinks

Battery

Yellow

Battery connected & Battery voltage > 7.5v – LED is on
No external power supply & no Battery – LED is off

Rate

Yellow

Blinks according the radiation trend

15-00044-10

• Set switch 7&8 to the OFF posit ion only in case the met er is being s t or ed.

Important Note:

For operational/configuration settings ensure dipswitches 1, 2, and 3 (dipswitch 3 is for transmitting
data) are in the ON position. For field use ensur e dip switches1, 2, 3, 7 and 8 are turned ON (7 and8
are for battery backup) .

4.2.5. LED pos ition and function

External power supply < 7.5v – led blinks

Battery disconnected or Battery voltage < 7.5v – LED blinks

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High

GM Tube

Low

Overflow
alarm

Field

800 mR/h

1000

ZP 1301

ZP 1201

600

0.05 mR/h

High

GM Tube

Low

Overflow
alarm

Field

1500 mR/h

10,000 R/h

4G60M

ZP 1201

1000 mR/h

0.05 mR/h

15-00044-10

4.2.6. Automatic Range S witching

4.2.6.1. DRM-1/2:

The detector includes two GM Tubes:
Low range - ZP-1201 (or equivalent), and high range - ZP-1301 (or equivalent).
In a field of 0.05 mR/h t o 800 mR/h both GM tubes are connected and the field is measured by the low

range GM tube. If the radiat ion field is higher than 800 mR/h, the low range detector is disconnec t ed,
and the radiation field is measured by the high rang e G M tube.

The switching between the low and high range GM-Tube is perfor m ed at 800 m R/ h when the radiat ion
field increases (low range detector is disconnected) , and at 600 mR/h when the radiation field
decreases (low range detector is connected).

4.2.6.2. DRM-2H:

The detector includes two GM Tubes:
The switching between the low and high range GM-Tube is perfor m ed at 1500 mR/h when the radiation

field increases (low range detector is disconnected) , and at 1000 mR/h when the radiation field
decreases (low range detector is connected). ( DRM-2H see note).

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4.2.7. Measuring Range f or the DRM-1/2D

• 0.001 mR/h to 9.999 mR/h (0.01 µSv/h to 99.99 µSv/h)

• Automatic background subtraction is available via MMV software

• Overflow Alarm f or reading > 10 mR/h

• Overload for field > 1 R/h

4.2.8. Automatic Bac k ground Subtraction

For the DRM-1/2D, the Automat ic Background Subtraction is set (using the MMV software) by
changing the “Backgr ound” number to “9999”. The DRM-1/2D will count the backg r ound for 60
seconds and then set the current back ground internally. To ensure a new update for the back grounds,
turn off dipswitches 7 and 8 and unplug the AC adapter from power. W hen the device is powered on,
the background will automatically update in 60 seconds. The displayed value on the optional display or
software will show the net dose rate.

4.2.9. Power Saving Mode Feature

The Power Saving Mode will reduce power consumption in case the AC power is not present. The
WRM2 radio must be setup for Pin Sleep configuration, for this function to work properly. Contact
Mirion (MGPI) Technologies for assistance.

The Power Saving Mode will be activated after the send code “8888” (via MMV in the Background icon)
is entered, sent and updated. If the DRM is set for a longer tr ans m ission int er val (i. e. 60 s econds t o
conserve power), and the Threshold alarm is reached, the DRM will be set to a transmission interval
level of 4 seconds (factory default) and t ransmit at the interval level until the Threshold Level rate falls
below the current set point and the transmission interval level will revert back to 60 seconds.

Example of the Setup Device Window for the DRM in the MMV Software

Note: The sleep mode can be cancelled by the send code “7777” (via MMV in background

icon) is entered, sent and updated.

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December 2015 Page 34 of 73

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Example of the WRM2 Radio Configuration Screen (pin sleep)

The Interval time level is based on how long a unit can run without AC power, 99 seconds is the
maximum transmission time interval.

To check if the DRM is in Power Saving Mode press on the “GET BUTT O N” in the “Setup Device”
window in the MMV software and the background window will be display “8888” to signify that the DRM
is in the Power Saving Mode.

4.2.10. Dose Rate Alarm Threshold Settings

Dose threshold settings are configured via the MMV software (Version 4.01 and DRM firmware). The
Def. Threshold (thr.0) is the current default setting in the DRM, i.e. Threshold (1) one is t he c ur r ent
default dose rate threshold ( see figure below), thr.0. To change the threshold setting using t he ACK
button on the display, toggle to the desired Threshold number, i.e. thr.3, let go of the ACK button and
the display will show the stored threshold setting and will be defaulted to this rate threshold alarm
setting.

Example of the Setup Device Window for with the Dose Rate Threshold Settings

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15-00044-10

December 2015 Page 35 of 73

4.2.11.Dose Function

Dose reading can be read as a part of the data record sent by the DRM.
To enable this function:

• Connect the DRM to the PC and run MMV software

• Move dipswitch 1&2 to the ON position, and set DOSE enable in the MMV software

If the DOSE reading is disabled, in place of a real dose reading, the record will be shown as 888888.8.
The Dose reading will be reset to zero in two cases: Disable\Enable Dose function, turn the DRM On.
Each time the instrument is turned ON; the Dose reading is reset to zero.

4.3. DRM Optional External Display & Alarm

An optional external display (part # RTM-9135) is available for remote locations
of the read-out, audiable and/or visual alarms with and with an alarm
acknowledge button.

A 25 foot cable connects the display to the
DRM via a D-type 9 pin connector and
supplies the power to the remote display.
The DB-9 connectors must be fasten
securelyfor the display to operate properly.

Note: Internal battery life is reduced when no external power supplied is used while using the

remote display.

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as authorized in writing by Mirion Technologies (MGPI), Inc.

December 2015 Page 36 of 73

Over threshold alarm

Failure

No alarm &
ready

Failure

Status

ON

BLINK

OFF

BLINK

Red Lamp

ON

OFF

ON

OFF

Green Lamp

ON

BLINK

OFF

BLINK

Buzzer

Thr and Dose rate reading [mR/h]
simultaneous

FAiL

Dose rate
reading [mR/h]

FAiL

Display

15-00044-10

Remote Display Functionality Description

4.3.1. External Display and Alarm Unit Display Ranges

A 7 segment 4 digit display unit displaying in the following formats:

• Meter display format:

• Measuring reading 0.000 to 9.999 mR/h for the DRM-1/2D

• Measuring reading for the DRM-1/2:

1. 0.001 to 9. 99

2. 10.0 to 99. 9

3. 100 to 999

4. 1.0E to 9.99E

5. 10.0E to 99.9E

6. 100E to 999E

• For numbers 1-3 the units will be mR/h

• For numbers 4-6 (with E) the units will be R/h

• Measuring reading 0.001 to 9,999 R/h f or t he DRM-2H:

OFLO in case of overload, reading > 10mR/h
ALr. and measuring r eading blink simultaneity in case of meter reading is over the s et ting threshold

alarm

Err1 in case of detector not connected.
Err2 In case of detector malfunction.

4.4. Battery Replacement

The battery holder is located inside of the DRM meter.

• Disconnect the external power supply and switch dipswitch 7 & 8 to the OFF position.

• Unscrew the six screws located at the back meter panel.

• Unscrew the two screws located at omega clip on the battery pack.

• Replace a new set of three 1.2v NiMH AA batteries.

DO NOT USE ALKALINE BATTERIES AS REPLACEMENTS FOR NIMH BATTERIES.

• Screw back on the omega clip on the battery pack .

• Screw back the six screws located at the back meter panel.

• Connect an external power supply.

• The battery backup will be charged and ready for use after 16 hours.

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15-00044-10

5. Communication

5.1. Communication

The communication between the DRM and PC can be performed in 3 ways:

1) Wireless Radio WRM2 located inside the meter.

2) Direct RS232 via the meter c om m unicat ion por t (D-type 9 pin female connector using a
Null Modem Adaptor).

3) WRM External Transmitter can be connected to the D-t ype 9 pin f em ale connector via
the AMP to WRM adapter.

5.2. Protocol

Communication parameters:

• Baud rate: can be select ed bet ween 300, 4800, 9600 and 19200 is the default.

• Parity: None

• Hardware handshaking: None

• Software handshaking: None

• Stop bit: 1

• Prefix: LF

• Suffix: CR

• Data for m at: 8 data bits

6. Communication Protocol

Description: DRM data to PC via radio or RS232

Byte 1 LF
Byte 2 to byte 7 Id meter number for communication set via Meter View software
Byte 8 status = 0x30=okay, 0x31=over load, 0x32=over thres hold, 0x33=no external power, 0x34=low

backup battery, 0x38=detector fault.

Byte 9 Status = multiple stat us m ess ages – See information below.
Byte 10 to byte 16 Dose Reading (x.xxxxx) or 8.88888 in case the Dose is disabled
Byte 17 = 0x30
Byte 18 to byte 22 rate reading X.YZW * 10
Byte 23 = 0x30
Byte 24 to byte 25 check sum
Byte 26 CR

T

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December 2015 Page 38 of 73

Byte

Description

1

LF 2 N5 3 N4 4 N3 5 N2 6 N1 7 N0

8

Status

9

Status

10

D5

11

D4

12

D3

13

D2

14

D1

15

D0

16

D-1

17

30H

18 X 19 Y 20 Z 21 T 22 W 23

Status 3 lsb

24

CS msb

25

CS lsb

26

CR

Overflow

Threshold

Alarm

Loss of external

power

Low Battery or battery

OFF

Error with

Detector

Status Code

30H

1

31H

1

32H

1

33H

1

34H

1

35H

1 1

36H

1 1

37H

1 1 1

38H

1 1

39H

1 1

41H

1 1 1

42H

1 1

43H

1 1

44H

1 1 1

45H

1 1

46H

See Table below

for Status 9

15-00044-10

Status Message - Byte 9

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December 2015 Page 39 of 73

0 1 2 3 4 5 6 7 8 9 10

LF

Status

D5

D4

D3

D2

D1

D0

0F

0F

CR

0 1 2 3 4 5 6 7 8 9 10

LF

30

20

20

20

20

20

20

0F

0F

CR

0 1 2 3 4-9

10-14

15

16-19

20

21-26

LF

30

Meter

Meter

Meter

Thr.

Meter

Down
time

Dose

Firmware

Byte 2:

Byte 3:

Byte 15:

Byte 20

AMP50 = 30

mR/h = 30

300=30

disable =30

AMP100=31

uSv/h = 31

4800=31

enable=31

AMP200=32

9600=32

19200=33

0 1 2 3 4 5 6 7 8 9 10

LF

34

Sec*
1000

Sec*100

Sec*
10

sec

20

20

0F

0F

CR

27-28

29

36h,37h

CR

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6.1. Set Meter Parameter via the PC

The parameters are set via the PC using the MMV software.

PC to meter

Status byte:

• Read meter parameters=30H

• Set Baud=31H

• Set Time=34H

• Set Threshold alarm value=35H

• Set Dose status=37H

• Set meter serial no.=38H

6.1.1. Read the Meter Parameters=30H

PC to meter

Meter to PC

type

unit

#

value

baud

load

En/Dis

version

byte 10-14 : threshold X.YZW * 10 T (X=byte10, Y=11, Z=12, W=13, T=14)

6.1.2. Set down load interval Time=34H

PC to meter

The interval time can be set from between 0 and 99.

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December 2015 Page 40 of 73

0 1 2 3 4 5 6 6 7 8 9

LF

35 X Y Z W T 20

0F

0F

CR

0 1 2 3 4 5 6 7 8 9 10

LF

37

D-30
E-31

20 20

20

20

20

0F

0F

CR

0 1 2 3 4 5 6 7 8 9 10

LF

38

D5

D4

D3

D2

D1

D0

0F

0F

CR

0 1 2 3 4 5 6 7 8 9 10

LF

31

code

20 20

20

20

20

0F

0F

CR

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6.1.3. Set Threshold alarm value=35H

PC to meter

6.1.4. Set Dose status = 37H

PC to meter

6.1.5. Set meter ser i al no. = 38H

PC to meter

6.1.6. Set Baud Rate = 31H

PC to meter

Code:
30h=300 32h=9600
31h=4800 33h=19,200

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December 2015 Page 41 of 73

Select meter type:
AMP + DRM

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7. Setting Meter Parameters using the MMV Software

7.1. Set PC communication

parameters

7.2. Set & Display Meter Parameters

To set new parameter value, type the required value on each window and then click on the Send
button for each parameter.

i.e.: Interval = 10  Send Threshold = 1000  Send

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Instrument

Type Code

TelePole

0

Ram Ion

1

AMP-50

2

AMP-100

3

AMP-200

4

DRM-1/2(H)

5

DRM-1/2D

6

Failed communication Comm uni cation OK

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7.3. MMV Operating Instructions:

7.3.1. Star t t he MMV software by CLICKING on the CALIBRATION but t on on t he MMV software

connect the DRM to the P.C. via the RS232 connection with a null modem connector, ensure
dipswitches 1 and 2 on in the ON position.

7.3.2. Set t he cor rect Communication port.

7.3.3. Select meter type, AMP+DRM.

7.3.4. Verify that the communication between the meter and the PC is ok ay. I f the communication is

fail, change the baud rate by click ing on the Setting, Communication port button, and select
another baud rate. Then click on Utility, Test to check again.

7.3.5. Once the communication is okay, use the Setting, Set up AMP button to configure the meter's

working parameters.

7.3.6. T he Serial Number shown in the Setup Device screen refers to the ID number used in the

communication protocol and not the serial number of the instrument which is setup using the
RMC (Rotem Meter Calibration) or the AMP View software. All portable instruments telemetry
ID will start with a ‘9’ followed by the unique identification number.

Meter Code for Telemetry (Area Monitors/Portable Instruments 9xxxxx)

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Meter type year serial # (DRM-1)

9 54 008

Input “9999” to activate

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Note: Correlation between the factory serial number and the Telemetry ID #

Factory S.N. ID #

AMP- 50 09 02 801 9 22 801
AMP-100 50 02 001 9 32 001
AMP-200 77 02 501 9 42 501
DRM-1 11004 - 0008 9 54 008

Example:

the Automatic Background

mode for the DRM-1D

(Does not apply to

DRM-1/2 model)

Note: For the DRM-1D/2D, the Automatic Background Subtraction is activated by changing

the “Background” number to “9999” and press Send. The DRM-1/2D will count the
background for 60 seconds and then set the current background internally. The
displayed value on the optional display or software will show the net dose rate.

7.4. Automatic Background Options:

7.4.1. When the Backup batt er y is disconnected ( dipswitch 7& 8 in of f) , connect the external power

supply, the meter will turn ON and enter to calculate the background during the 60 second
count, automatically, after 60 sec ond t his value will be kept in memory.

7.4.2. Connect t he m eter to PC and run the MMV software, in the AMP setup function type “9999” for

automatic calculation, the meter will enter to calculate t he bac kground during 60 second, af t er
60 second this value will be kept in memory.

Note: If the threshold alarm setting is lower than the background when performing the

automatic background subtraction the alarm will be activated until the background is
stored and the display is showing the net rate.

7.4.3. Connect t he m eter to PC (using the null modem adapter) and run the MMV software, in the

Amp setup function type desirable “9999” the background value.

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December 2015 Page 44 of 73

DRM-1/2

DRM-2H

F1 should be set at 50 mR/h ± 20 mR/ h

F1 should be set at 50 mR/h ± 20 mR/h

F2 should be set at 350 mR/h ± 50 mR/h

F2 should be set at 600 mR/h ± 100 m R/ h

F3 should be set at 10 R/h ± 2 R/h

F3 should be set at 20 R/h ± 5 R/h

F4 should be set at 200 R/h ± 60 R/h

F4 should be set at 1000 R/h ± 200 R/h

F5 should be set at 600 R/h ± 100 R/h

F5 should be set 8000 R/h ± 1000 R/h

15-00044-10

8. Calibration Summary for the DRM-1/2

8.1. Preface

8.1.1. Cali bration Factors

To improve the linearity, the DRM-1/2(H) includes five calibration factors: The two lower factors are f or
the low range GM tube, from 0.05 mR/ h to 800 mR/h; and the other three are for the high range GM
tube, from 600 mR/h to 999 R/h (DRM-1/2) or 1000 mR/h to 9,999 R/h (DRM-2H). Once t he F factors
have been set a linearity verification should be performed on all ranges.

The calibration factors will be set using the RMC software:

F1 - first calibration factor for low range.
F2 - second calibration factor for low range.
F3 - first calibration factor for high rang e.
F4 - second calibration factor for high range.
F5 - third calibration factor for high range.

• F1 and F3 are us ed t o compensate the GM tube sensitivity tolerances.

• F1 for the low range (ZP1201) and F3 for the high r ange (ZP1301 [DRM1/2]) (4G60M [DRM-2H]).

• F2, F4 and F5 ar e us ed t o compensate the dead time tolerances.

• F2 for the low range (ZP1201) and F4, F5 for the high r ange (ZP1301 [DRM1/2]) (4G60M [DRM-

2H]).

8.1.2. Cali bration Ranges

Measured (displayed) readings are calculated by one of the following two formulas, depending on the intensity of the radiation field:

• Low range: N(mR/h) = [n*F1 + dead time correction {n*F2}]/ 17

• High range, up to 300 R/h: N(R/h) = [n*F3 + dead time correction {n*F4}]/300 (DRM2)

• High range, over 400 R/h: N(R/h) = [n*F3 + dead t ime c or r ection {n*F5}]/300 (DRM2)

• High range, up to 3500 R/h: N(R/h) = [n*F3 + dead time correction {n*F4} ] /77 (DRM-2H)

• High range, over 5500 R/h: N(R/h) = [n*F3 + dead time correction {n*F5}] /77 (DRM-2H)

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Dead time correction factor

F3

F average

Field [R/h]

10000

5500

3500

F2

Dead time correction factor

F3

F average

Field [R/h]

1000

400

300

F2

Dead time correction factor

F3

F average

Field [mR/h]

4000

1200

1000

F2

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Where:

• n is the detector f requency obtained in the radiation field.

• N is the updated measurement r eading.

• Between 300 R/h to 400 R/h (for DRM-1/2) and between 35,000 R/h t o 55, 000 R/ h ( DRM-2H), a

weighted average of F4 and F5 is used as the dead time correction factor. The c alculation of the
"averaged factor" and the c or r esponding measurement formula follow:

• x = (last N( R/h) - 300)/100 (DRM-1/2)

• x = (last N(R/h) - 3500)/2000 (DRM-2H)

• Last N = previous measurement reading

• F average = (1-x)* F4 + x* F5

• N(R/h) = [n*F3 + dead time correction {n*F average} / 300 (DRM-1/2)

• N(R/h) = [n*F3 + dead time correction {n*F average}/77 (DRM-2H)

The following graphs illustrate the r anges over which F2, F3 and F average are used as the DRM’s
dead time correction factor :

Low Range:

High Range (DRM-2):

High Range (DRM-2H):

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December 2015 Page 46 of 73

DRM-1/2

DRM-2H

F1 in a field > 10 mR/h and < 100 mR/h

F1 in a field > 10 mR/h and < 100 mR/h

F2 in a field > 100 mR/h and < 800 mR/h.

F2 in a field > 400 mR/h and < 1000 mR/h.

F3 in a field > 800 mR/h and < 50 R/h

F3 in a field > 1.5 R/h and < 500 R/h

F4 a field > 50 R/h and < 350 R/h

F4 in a field > 500 R/h and < 6000 R/h

F5 in a field > 350 R/h

F5 in a field > 6000 R/h

15-00044-10

9. Calibration Guidelines

9.1. Summary for the DRM-1/2D

9.1.1. Preface

9.1.1.1. Calibration Factors

The DRM-1D/2D requires only one calibration point which requires only one change to Factor 1 (F1) in
the Meter Calibration software. Once the F1 factor has been set perform ed, linearit y verif icat ion should
be performed.

The DRM-1D/2D can be calibrated via the RS232 communication port with a NULL modem adapter in
a similar method to Section 9.2 below.

Switch to the ON position dipswitches 1&2 for RS232 and the calibration will be performed by using the
Meter Calibration software. Refer to section 10.1 for instructional use of the calibration sof tware.

9.1.1.2.

F1 is recommended to be set at 0. 1 to 0.2 mR/h.

Calibration Ranges

9.2. Calibration Procedure for the DRM-1/2, DRM-2H, and

DRM-1/2D

9.2.1. Preface

The DRM-1/2, DRM-2H, and DRM-1/2D can be calibrated via the RS232 communication port with a
NULL modem adapter.

Switch to the ON position dipswitches 1&2 for RS232 and the calibration will be performed by using the
Meter Calibration software.

If the radiation field is greater than 10 mR/h, the software will automatically enable the setting of the
appropriate factor, depending on t he field intensity for the DRM. Refer to section 10.1 for instructional
use of the calibration software.

9.2.1.1.

Calibration Ranges

Note: If the radiation field is lower than 10 mR/h, each factor can be set manually by the

calibration software.

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as authorized in writing by Mirion Technologies (MGPI), Inc.

15-00044-10

December 2015 Page 47 of 73

9.3. Operating Instructions

9.3.1. Run the calibration program via the RMC.EXE file (or icon).

9.3.2. Enter a Login name/calibrator (“jsmith”) name that wil l appear in the calibration

documentation (up to 12 characters).

9.3.3. Enter Password – “Mirion” in lower case.

9.3.4. Click OK, the program enters the main window.

9.3.5. The caption in the main window (linearity report) displays the previous template. In the

displayed template the operator executes the required operations to complete the
calibration and linearity.

9.3.6. To start the procedure, click File/New Report.

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15-00044-10

9.4. Template & Parameters Setup

The template includes setup parameters and instrument parameters. To select or create a new
template, proceed as follows.

9.4.1. To select an existing template

The RMC program is supplied with a number of def ault templat es. Click File/ Open t emplate and select
the required template.

9.4.2. To create a new template

9.4.2.1. Fill the following parameter s in t he displayed templat e: Sr c

(source), Measuring Point including units, Distance, and At tenuators.
To select between mR/h and R/h, or cps and Kcps, or cpm and
Kcpm, click each of the unit’s columns.

9.4.2.2. Select Parameters / Setup from the pull down menu.

Complete the following

• Customer - Enter header (up to 4 lines) for the calibration &

linearity certificate.

• Accepted accuracy:

 As Left - Enter maximum allowed deviation
 As Found - Enter maximum allowed deviation
 Source 1 - Enter source type used in the calibration facility.
 Source 2 - Enter source type used in the calibration facility.
 Calibration due - Set the calibration interval.
 Click OK to save data and quit.
 Click Cancel to cancel data changes and quit.

9.4.3. Select Parameters / Template from the pull down menu.

In the Template Settings window perform the following:

• Template name - Fill new template name

• Instrument - Select instrum ent t ype/ nam e

• Note: For the DRM select TelePole meter.

• Units - Select units to be used in this template

• New template - Save current template settings into a new file

• Open template file - Select existing template without changing it

9.4.4. S et PC Communication Port

• Select Parameters / Communication f r om the pull down menu.

• Set the Comm. port.

• Set Baud rate (19200 BPS).

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December 2015 Page 49 of 73

15-00044-10

9.5. Starting-up the Calibration & Linearity Process

9.5.1. Connect t he DRM to the com puter via the appropr iate Comm. Port us ing a NULL Modem

adaptor (according to the select ed por t in t he set up program).

9.5.2. T ur n t he m eter on and ensure dipswitches 1 and two are in the ON position

9.5.3. Execute the RMC file.

9.5.4. Enter User nam e up t o 12 c har acters i.e., jsmith.

9.5.5. Enter Password, t ype Mirion (in small letters).

9.5.6. To check and calibrate the instrument, first enter Linearity and check As Found. Then

enter from the pull down menu to Instr ument/ Calibration. After calibration is perfor med,
return to Linearity and check As Left .

Note: If the computer / instrument communication failure or is disconnection, the

Communication Error Message is displayed in the computer’s display. Check the
communication cable, Comm. Port, or dip switch settings on the DRM. Also, check the
communications port of the PC.

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15-00044-10

9.6. Calibration

Select Instrument/Calibrate… from the pull down menu. The calibration menu will be displayed.

(1) Instrument reading – Current dose rate reading
(2) Factor Num. - Factor num ber for the calibration. The listing in this screen depends on the

amount of calibration points available from the instrument. If t he “ Aut o” r adio but t on is s elect ed
the software will recognize the filed value and allow for calibration of the pert inent point . I f the
calibrator wants to insert a factor into a s pecific range, he or she simply selects the f ield.

(3) Factor Num. - Current ac t ive f actor number. This window will display the current active factor

number and is especially useful in the Auto mode for reference purposes.

Note: The calibration factors are selected according to the detector's radiation field location.

Only the displayed factor can be changed.

(4) Old Factor: - Previous calibration factor as saved (stored) in the instrum ent memory.
(5) Enter Radiation Field: - Factor can be changed in two modes:

• Insert the measured field. The computer will calculate the new factor dependant on the radiat ion

field and the old factor. T he new f actor value will be displayed on the New Factor box.

• Using the ± boxes.

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15-00044-10

(6) New Factor: - The New Factor will be displayed and is a function of the actual cur r ent reading

against the Radiation field that was typed into the window. If the calculated factor value is lower
than 0.6 or higher than 1.4, calibrat ion will be not perf or m ed.

(7) Force 1 – Select in case the operator wants to force the calibration factor t o 1.00. Use this

when an incorrect factor was stored.

(8) After t he factor changing, press Update Fac t or . Ensure to obtain the status: Factor Acc ept ed.
(9) Update Details - Press Update Details.
(10) Ensure to obtain Status: Details Accepted.
(11) End Calibrati on – Click to quit the calibration function and return to t he m ain m enu .
(12) Backg r ound sub (currently not in use).

9.7. Linearity

To enter the Linearity Report window press File → New Report. The Linearity Report window
includes As Found and As Left columns. Before calibration and linearity check, perform the
proceeding steps in the following order:

• Check the linearity in As Found column.

• If linearity fail is obtained the instrument is defective and cannot be calibrated (P/F –fail).

• If linearity As Found is ok, calibrate the instr um ent.

• Check the linearity in As Left column.

• In order to check linearity and perfor m calibration to other instrument, select

File →New report on the pull down menu.

9.7.1. Linearity Report Window Description

Src - Type of source employed for calibration and linearity. The source type is defined in the set-up

parameters.

Meas.Point - Radiation field where linearity tests are performed.
Unit - Measurement units.
Distance and Att. - Distance between detector and source and attenuator factor.
As Found - Instrument reading prior to calibration.
As Left - Instrument r eading after calibration.
Err% - Reading deviation % between measuring point (calculated value) and meter reading.
P/F - Notifies that linearity check ing is correct.
Serial Number - Instrument number , may be changed in Parameters / Instrument.
Accepted accuracy - Permitted deviation in % between the instrument reading and radiation.

Defined in the

Parameters / Set up.

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→

15-00044-10

Sources [Src] - Source type by which calibration and linearity were performed. Source defined in the

set-up parameters.

Customer Header- Customer: Enter header (up to 4 lines) for the calibration & linearity cert ificate.
Curr. Calibrator - Present calibrator's name and calibration date.
Prev. Calibrator - Former calibrator's name and calibration date.
Factors - Factors' value.

9.7.2. (1) Checking adequate connection between instrument and com puter. If after the fifth

time there is no communication, an alarm m essage is displayed.

9.7.3. (2) 0. 00 m R/ h - Instrument reading is updated every second.

9.7.4. (3) Closed - After checking the first reading by pressing X on the tested point line, it is

recommended to perform File
saved after checking of each tested point. As long as the Closed text box is not marked, it is
possible to make changes while entering and exiting the file. At the end of the linearity check
process, marking 3in the Closed text box will make the file "read only". From now on, when
entering the saved file marked 3 Closed, it will be impossible to perform any changes in the

Linearity Report window.

Save as. From now on, the file is automatically updated and

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15-00044-10

9.8. Save, Load and Print Calibration and Linearity Certificate

9.8.1. Save and Print Curr e nt Ca libration and Line a rity Certificate

• Click File / Save for saving the Calibration and Linearity Certificate in a file.

• Click File / Print for Calibration and Linearity Certificat e printout.

• Click Graph to display Linearity graph.

• Click Plot and select Linearity or Relative Error graph.

• Click File / Print for Linearity graph pr int out .

9.8.2. Load and Print Pr e vious Ca libration and Line arity Certificate

• To load a previous Calibration and Linearity Certificate click File/ Open.

• Double click to select the appropriate drive.

• Double click to select the appropriate file.

• Click File / Print for Calibration and Linearity Certificat e printout.

• Click Graph to display Linearity graph.

• Click Plot and select Linearity or Relative Error graph.

• Click File / Print for Linearity graph print out .

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Input Frequency

Display

Input

[Hz]

Display

17

1.00 300

1.00

170

10.0

3200

10.7

2000

141

10,000

39.2

4000

365

30,000

183

5000

534

40,000

323

6000

730

50,000

525

6300

804*

60,000

839 75,000

O.F. (overflow)

Input Frequency

Display

Input

[Hz]

Display

17

1.00

77

1.0

170

10.0

770

10.0

2000

141

9612

136

4000

365

47256

1098

5000

534

98712

5748

6000

730

123710

12400

6300

804*

132933

OFLO

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9.9. CPS to mR/h Conversion Tables

9.9.1. DRM-1/2 CPS to mR/h Conversion Table

Table 1 - Low Range GM tube Table 2 - High Range GM tube

[Hz]

[mR/h]

Frequency

• Switches to high rang e detector

Note: These results are valid only when all factors equal to 1.

9.9.2. DRM-2H

[Hz]

[mR/h]

Frequency

[R/h]

[R/h]

• Switches to high rang e det ec t or

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Input Frequency

[KHz]

Display

[mR/h]

1

0.147

2.8

0.397

4.9

0.795

8.75

1.590

11.9

2.385

14.6

3.180

16.9

3.975

19.1

4.770

21.1

5.565

22.7

6.360

24.4

7.155

25.8

7.950

28.5

9.540

30

OFLO

15-00044-10

9.9.3. DRM-1D/2D CPS to mR/h Conversion Table

These results are valid only when F1 is equal to 1.

9.10. Calibrating the DRM-2EN

The DRM-2EN with the Prescila neutron detector are supplied with calibration certificates from
the manufacturer. The calibration should be checked annually and if necessary should be
adjusted according to the following instructions.

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15-00044-10

Reference Point: 15 mrem/h

To calibrate the neutron detector, two adjustments should be performed:

H.V. Adjustment: to bring the adapter into the correct range
Threshold Adjustment: To fine tune the correlation between the displayed dose rate and

pulses.

• Place the detector in a neutron dose rate field of 15 mrem/h and check the result on the
display. If the r esult is ± 10% of t he expected reading, we suggest verifying t he full range for
linearity, which should be ±20% of the expected reading.

• If the reference point reading is outside the range of ± 10% follow calibration procedure
described below.

Calibration Procedure

9.10.1. Place the detector in the reference point (15 mrem/h) and expose the source. If the reading is more than 50% over the expected reading, you need to modify the H.V. setting.

9.10.2. If the reading is more than 50% under the expected reading, you need to modify the threshold.

9.10.3. The H.V. modification is done by adjusting the H.V. CAL. screw while using a Digital Multimeter with H.V. probe connected to the H.V. measure point and Ground to receive the current H.V. setting .

9.10.4. The HV value should be in the range of 500 to 700 volts.

9.10.5. The T hreshold modification is done by adjusting t he THR. Cal screw while using Digital Multimeter with clamp probe connected to the Thr. Measure Point and GND.

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DRM-2EN Adapter Board

9.10.6. Remove the adapter boar d from the inside of the neutron detector by peeling back the rubber handle and opening the 4 screws

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9.10.7. Connect the cable f r om the DRM-2EN to the connector of the detector

9.10.8. Power up the DRM-2EN

9.10.9. Caution!!! The detector operating voltage (HV) is supplied to the detector via the

detector input connector. A mild shock m ay be experienced if you make contact with
the center pin of the input connector .

9.10.10. Connect the H.V. probe to H.V measure point or the Clamp probe to the threshold

measure point accordingly to the measured deviation

9.10.11. Adjust the required screw (H.V. or Threshold).

9.10.12. Replace the cap t o test the modification. The cap m ust be closed so that no light enters

the PMT of the detector tube during the irradiating procedure.

9.10.13. Step 9.10.12 should be repeat ed until the accuracy of the ref erence point is within the

range of ±10%.

9.10.14. Once the reference point is set, we recommend that the entire measuring range be

checked to be no more than ± 20% over the full range.

9.10.15. Gamm a rejection should be verified that a 100 mrem/ h dose rate field should produce

no more than 2 mrem/h reading on the DRM-2EN.

10. Upgrading the DRM firmware

Note: Follow these directions carefully (contact MIRION for assistance).

10.1. Install the DRM Firmware Updater software by unzipping the files to a known directory

and clicking on the “Setup” in the “Installer” directory.

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10.2. Disconnect the meter from the power supply and ensure that the battery back-up is

also turned OFF; dip switches 1 and 2 in the OFF pos it ion, s ee figure 2 or 3.

10.3. Set dipswitch 1& 2 to on position.

10.4. Set dipswitch 3 to 8 to off position.

10.5. Open the back meter panel, see figure 2 or 3.

10.6. Switch E1 located at mother board card to update posit ion (upward). See Figure2 for the

DRM-1 or Figure 3 DRM-1D.

10.7. Connect the meter to the PC via the RS-232 cable and NULL modem adapter .

10.8. To start the Firm ware Updater soft ware double clicking the “ Application.exe” icon in

the known directory (see next page for sc r een view).

10.9. Set the PC Communications Port and load the supplied *.hex file,, i.e. “drm1-4769.hex”

located in the known created directory for t he software.

10.10. Select " s end an ans wer" function 1 (Check).

10.11. Click on t he St ar t (white arrow) to initialize the program.

10.12. Connect the meter to the power supply information should appear in the File Read

screen.

10.13. If the menu does not appear, turn (disconnect) the power supply off, click on the stop

(red point) icon and go back to item 10.

10.14. Click on t he " s end 1" but ton.

10.15. Check that the right hand window displays “Enter to command > 1 **** Ready to

receive”.

10.16. Click on " send 2".

10.17. Check that the right hand window displays “The file was verified and is good for

update.” Enter command.

10.18. Select " s end an answer" function 2 (Update).

10.19. Click on " send 1".

10.20. Check that the right hand window displays “Enter to command > 2 **** Ready to

Receive”

10.21. Click on " send 2" wait…

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10.22. Check that the rig ht hand window displays “Firmware update complet e” and verify that

the information in the window is exactly like figure 1 bef or e r em oving the AC power.

10.23. Disconnect t he power supply and remove the serial/null cable.

10.24. Switch E1 located on the motherboard card 2143 to inverse "update" position

(downward).

10.25. Connect t he power supply and verify that t he m eter operates.

10.26. Ensur e Dip Switches 1, 2, and 3 ar e in t he O N posit ion.

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New *.hex file

Start

Stop

Dialog screen

Com

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Firmware “Updated” Screen

Firmware Update Screen

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Figure 2. DRM-1

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Figure 3. DRM-1D

11.

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11. DRM - List of Electronic Schematics

Note: The following schematics are for information only and are not subject to revision control.

• DRW #13840-40-00 DRM CPU card - PC #2142

• DRW #13840-41-00 DRM MOTHER BOARD PC #2143

• DRW #13844-40-00 DRM-2, Alarm Card, PC #2221

• DRW #12852-42-00 TelePole W.R. GM Detector PC #2196

• DRM-2 Wiring Diagram

• DRM-2E Wiring Diagram

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(MGPI), Inc.

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(MGPI), Inc.

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(MGPI), Inc.

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10

11

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12. DRM - Environmental Enclosure Configuration

Environmental Enclosure Assembly: Figure 13-1

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Environmental Enclosure Assembly (Figure 14-1)

1 Mounting Plate
2 Circuit Board
3 Power Supply
4 Telemetry Antenna
5 Antenna Cable
6 Strobe Light
7 DRM-1/D Monitor
8 Power Cable
9 Environmental Enclosure
10 Audible Buzzer
11 Acknowledge Pushbutton

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except as authorized in writing by Mirion Technologies (MGPI ), Inc.