Mirion Technologies NGM 204L User Manual
NGM 204L
Particulate, Gas & Iodine Monitors
NGM 204L
Low Range Noble Gas Monitor
The NGM 204L monitor from the RAMSYS product
line has been developed to sample air in discharge
stacks, ventilation ducts or working areas. The dual
silicon diode detector integrated in a 4 π/5 cm (4 π/2
in) lead shielded sample volume guarantees high
reliability of the measurements. The rst silicon diode
detects the beta/gamma radiation from sample vo-
lume and the gamma ambient radiation. The second
one detects gamma radiation from sample volume
and the gamma ambient radiation. This allows noble
gas beta measurement with dynamic gamma com-
pensation by the processing algorithm.
FEATURES
● Dynamic gamma radiation compensation
● Calculation of the total released activity through a stack
ow rate signal provided
● Compact and reliable
● Minimum periodic maintenance
APPLICATIONS
• Effl uent release monitoring
○ Stacks, etc.
• Radioprotection of workers
○ Containment atmosphere, etc.
RELATED MONITORS
• NGM 204S: seismically quali ed version
• PING 206S: version with particulate and iodine
• PNG 206S: version with particulate
radiation monitoring
systems
A Mirion Technologies Division
Featuring:
NGM 204L
Particulate, Gas & Iodine Monitors
PHYSICAL CHARACTERISTICS
● Radiation detected: beta and gamma
● Detector: dual large area silicon
● Sampling chamber: 300 ml (300 cc)
● Typical energy windows:
○ Beta: 80 keV to 2.5 MeV
○ Gamma: 80 keV to 2.5 MeV
● Typical measurement range:
○ 85
Kr: 3.7 10+4 to 7.4 10
+13
Bq/m3
(10-6 to 2 10+3 μCi/cc)
○ 133
Xe: 3.7 10+4 to 3.7 10
+12
Bq/m3
(10-6 to 10+2 μCi/cc)
ENVIRONMENTAL CHARACTERISTICS
● Long term temperature: +10°C to +40°C
(+50°F to +104°F)
● Periodic temperature: -5°C to +55°C
(+23°F to +131°F)
● MTBF: > 20 000 hours, with preventive maintenance
● TID: 100 Gy (10
+4
rad)
PNEUMATIC CHARACTERISTICS
SIGNALING (Applicable to LPDU only)
● Alphanumeric display: measurement, status…
● Sound alarm: buzzer 90 dBA at 1 meter
● Visual alarm: 3 lights (red, yellow, green)
REFERENCE STANDARDS
● Nuclear: IEC60761
● EMC: 2006/95/CE and 2004/108/CE, IEC61000-6-2
and IEC61000-6-4
VERSIONS
● 230 Vac or 120 Vac
● LPDU or LPU
● With or without dust lter holder
● Pumping unit
● Monitor wall or oor xing plate
ACCESSORIES
● Calibration tools
● Software
● USB converters
● Standard ow rate: 35 l/min (1.24 scfm)
● Pressure drop: according to the lter dust loading
MECHANICAL CHARACTERISTICS
● Dimensions: 864 mm x 725 mm x 440 mm
(34 in x 28.5 in x 17.3 in)
● Weight: ~ 220 kg (~ 495 lb)
● Color: gray RAL 7030 (decontaminable paint)
● Inlet tube connection: Ø 12 mm OD (1/2 in)
● Outlet tube connection: Ø 12 mm OD (1/2 in)
ELECTRICAL CHARACTERISTICS
● Power supply: 230 Vac – 50 Hz or 120 Vac – 60 Hz
● Data link outputs: 1 RS232 and 2 isolated RS485
● Alarm relays: 3 SPDT relays
● I/O: 2 isolated analog outputs and 1 isolated analog
input (0/4-20 mA)
Mirion Technologies (MGPI) SA
Route d’Eyguières
FR-13113 Lamanon
France
T +33 (0) 4 90 59 59 59
F +33 (0) 4 90 59 55 18
Mirion Technologies (MGPI) Inc
5000 Highlands Parkway
Suite 150
Smyrna, GA 30082
USA
T +1 770 432 2744
F +1 770 432 9179
Mirion Technologies (MGPI H&B) GmbH
Landsberger Strasse 328a
DE-80687 Munich
Germany
T +49 (0) 89515 13-0
F +49 (0) 89515 13 169
www.mirion.com
144107EN-E
Mirion Commercial (Beijing) Co., Ltd.
Shanghai Jiangchang Commercial Branch
Room 801, 78 Jiangchang SanLu
Zhabei District, Shanghai 200436
PR of China
T +86 21 6180 6920
F +86 21 6180 6924
Since norms, speci cations and designs are subject to occasional change, please ask for con rmation of the information given in this publication.
Mirion, Mirion Technologies and MGP Instruments are trademarks and/or registered trademarks of Mirion Technologies, Inc. and/or its a liates in the United States and/or other countries.
All other trademarks are the property of their respective owners.
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