AUTONOMOUS GAMMA STATION AGS421S/F/M - ENVINET GmbH

AUTONOMOUS GAMMA STATION AGS421S/F/M
The Autonomous Gamma Station AGS421 is the GSM (optional GPRS) version within our series of autonomous gamma dose rate
monitoring stations which combine gamma measurement capability with data logging capability as well as autonomous operation due
to solar power supply and wireless data transmission. Data communication between AGS421 and Network Monitoring Centre (NMC)
uses cellular networks which are nowadays available everywhere.
Two models are available: AGS421S for stationary use is designed for fixed installation and unlimited operation, which is achieved by
the solar panel and a back-up battery. AGS421M is the mobile version which is quickly deployable for temporary use of up to 20-days
of battery operation. Thereby AGS421 negating the need for an external AC power and for a wired data communication connection.
This independence from any wire connection eases the installation and permits the detector location to be changed as necessary.
This high-sensitivity probe for measuring gamma dose rates consists of three Geiger–Muller (GM) detectors and an integrated,
microprocessor-based evaluation unit for calculating, storing and transmitting the measured dose rates and system data to the
Network Monitoring Centre (NMC). The use of the two low dose rate detectors (LD) allows detection of minor changes in the radiation
level at background values with short measurement cycles. The third detector (HD) is for measurement at higher dose rates (>100
µSv/h [>10 mrem/h]). The use of two low dose rate detectors also enables a higher reliability through the redundancy and increased
detection sensitivity. Hermetically sealed detector housing protects the electronics and detectors from external conditions.
AGS421 is equipped with RS-232 interface for service and maintenance purposes on site. Additionally, self-diagnosis of the batterybuffered
solar power supply and other important technical parameters is carried out cyclically (self-supervision). Rain sensor and GPS
receiver are available as options.
S-TYPE - FOR STATIONARY USE
WITH INTEGRATED RAIN
DETECTOR
M-TYPE – THE MOBILE VERSION
WITH INTEGRATED RAIN
DETECTOR & GPS
F-TYPE – FOR PERMANENT
INSTALLATION

FEATURES AND FUNCTIONS
� Measurement values in 1-minute-intervals (storage of
the last 60 values)
� Calculation of 10-minute mean values (storage of the last
432 values, i.e., values for 3 days)
� Calculation of 2-hour mean values (storage of the last
180 values, i.e., values for 2 weeks)
� Calculation of 24-hour mean values (storage of last 32
mean values, i.e., values for 4 weeks)
� Programmable integration time
� Automatic switching between low range and high
range detectors
� Correction of detector response characteristic
� Correction of detector background
� Correction of local background
� Temperature compensation of the measurement values
� Functional supervision of GM detectors
� Cyclic self-test of the whole electronic system
� Integrated humidity sensor to detect a damaged
housing
� Overload detection for LD and HD detectors
� High Voltage supervision LD/HD
� GSM data transmission of all readings
� SMS data transmission of all readings
� Solar panel and battery status control
� Notification in case of threshold exceedance or
� technical problems
� Intelligent user administration (8 users, 3 groups)
� Complete remote diagnosis and parameter setting
� Complete diagnosis, parameter setting, maintenance and
calibration with Service-PC on site
TECHNICAL DATA – LOW DOSE RANGE
Detector 2 x GM detector 70 031A
Range 10 nSv/h to 2 mSv/h
(1 µrem/h to 0.2 rem/h)
Sensitivity 1646 counts min -1 / µSv/h
(16.46 cpm per µrem/h)
Detector background 38 counts min -1 (38 cpm)
Energy range 38 keV to 1.3 MeV (±25 %)
35 keV to 2.5 MeV (-29 % to +67 %)
Response (rel. to Cs-137)
10.0
1.0
0.1
10 20 50 100 200 500 1000 2000 5000 10000
Photon Energy [keV]
AGS421S/F/M/01EN/09/2011 Technical contents are subject to change without notice!
ENVINET GmbH
Hans-Pinsel-Str. 4, 85540 Haar (Munich), Germany
Tel +49 89 456657-0
info@envinet.com, www.envinet.com
GENERAL TECHNICAL DATA
Detection ranges 10 nSv/h to 10 Sv/h
(1 µrem/h to 1000 rem/h)
Accuracy ± 15 % (calibrated to Cs-137)
Operating temperature
Measuring devices -40°C to +60°C (-40°F to +140°F)
GSM data com. -20°C to +60°C (-4°F to +140°F)
Power supply Solar panel battery buffered
Power consumption 0.2 W
Data transmission via GSM network
Electromagnetic EN50081-1:1992
Interference protection EN50082-2:1995
(European standards)
Diameter - Height 80/115mm - 1300 mm
(3.15/4.53 in. – 51.18 in.)
Weight:
AGS421S 25 kg (55.12 lb)
AGS421M 16 kg (35.27 lb)
Protection class Probe: IP68; Station: IP65
GENERAL TECHNICAL DATA
� Integrated GPS receiver for mobile application
� Integrated rain detector
� Mobile mounting platform for stationary AGS421S
� Battery charger for AGS421S
� Transportation box for mobile AGS421M
� Solar panel for mobile AGS421M
� GSM communication (optional GPRS)
� Model AGS421F for stationary use with AC power supply
CERTIFICATES
Type approval of PTB
TECHNICAL DATA – HIGH DOSE RANGE
Detector GM detector 70 018A
Range 0.1 mSv/h to 10 Sv/h
(10 mrem/h to 1000 rem/h)
Sensitivity 1.03 counts min-1
(10.3 cpm per mrem/h)
Energy range 70 keV to 1.3 Mev (+15%)
70 keV to 4.5 MeV (-29 % to +67 %)
Response (rel. to Cs-137)
10.0
1.0
0.1
10 20 50 100 200 500 1000 2000 5000 10000
Photon Energy [keV]