GDA 2 Gas Detector Array 2
Portable detector for hazardous gases and chemical agents
The new Portable Gas Detector Array is specifically designed to detect and
monitor most common hazardous gases including chemical warfare agents (CWA).
The main detector, an ion-mobility spectrometer (IMS) readily detects
ammonia, inorganic sour gases, small chlorinated molecules as well as other
electropositive and electronegative compounds. The IMS is also used in the
CWA detection mode.
The IMS functions as part of an array that includes a photoionization
detector (PID), an electrochemical cell and two metal oxide sensors. With
the additional detectors the GDA is able to evaluate other toxic compounds,
including benzene, phosgene, vinyl chloride and chlorobenzene.
The GDA 2´s gas flow system and internal dilution system is ideal for fire
and rescue workers operating in harsh environments. |
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Technical Data GDA 2
Hazardous compounds / (GDA-Mode) List
with tolerable concentrations*
|
Substance |
Concentration limit* [ppm] |
Sensor type |
|
Substance |
Concentration limit* [ppm] |
Sensor type |
| Acetic acid |
20 |
IMS, SC |
Hydrogen chloride |
5 |
IMS, EC |
| Acetone |
500 |
IMS, PID, SC |
Hydrogen cyanide |
5 |
IMS, EC |
| Acroleine |
0.2 |
SC |
Hydrogen fluoride |
10 |
IMS, EC |
| Acrylonitrile |
20 |
IMS, SC |
Methanol |
500 |
IMS, SC |
| Ammonia |
50 |
IMS, SC, EC |
Nitrogen dioxide |
1 |
IMS |
| Benzene |
20 |
PID, SC |
Phosgene |
0.1 |
EC |
| Carbon dioxide |
10000 |
- |
Phosphine |
0.5 |
EC |
| Carbon disulfide |
10 |
IMS |
Styrene |
40 |
IMS, PID, SC |
| Carbon monoxide |
100 |
SC |
Sulfur dioxide |
1 |
IMS, EC |
| Chlorine |
1 |
IMS, EC |
Tetrachloroethylene |
100 |
IMS, SC |
| Chlorobenzene |
100 |
PID, SC |
Toluene |
100 |
PID, SC |
| Chlorocyane |
0.3 |
IMS |
Toluene diisocyanate |
0.02 |
IMS |
| Hydrazine |
1 |
IMS |
Trichloroethane, 1,1,1- |
300 |
IMS |
| Formaldehyde |
1 |
SC |
Trichloroethane, 1,1,2- |
25 |
IMS |
| Hexane, n- |
200 |
PID, SC |
Trichloroethylene |
100 |
IMS, PID |
| |
|
|
Vinyl chloride |
100 |
PID, SC, EC |
* Selection of chemical
compounds (comparable to ERPG), tolerable concentration values for
firefighter working 4 hours without breath protection
|
|
Chemical Warfare Agents (IMS- Mode) |
|
Nerves |
|
Skin |
|
Blood |
| GA (Tabun) |
HD (S-Lost) |
AC (CHN) |
| GB (Sarin) |
HN (N-Lost) |
|
| GD (Soman) |
L (Lewisit) |
|
| GF |
|
|
| VX |
|
|
Modes of Operation: GDA mode for hazardous compounds, IMS mode for
chemical warfare agents
Detectors: ion mobility spectrometer (Ni63 ion source, positive and
negative mode), photo ionization detector (10.2 eV), electrochemical cell, 2
metal oxide sensors
Sampling System: internal pumps, internal sample dilution system
Measurement Time: typical some seconds to less than 1 min
Identification: different pattern recognition methods available
Display: graphical display integrated, serial port – RS-232
Power: Battery powered (LiIon) or external power supply, 30W
Weight: 4.2 kg (8.4 lbm) (without batteries)
Dimensions: ca. 395 x 112 x 210 mm (ca. 15.7 x 4.5 x 8.4 in)
Options: Infrared heater for thermal desorption and analysis of
surfaces, calibration unit
Features
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Broad detection range
The GDA is the only detector, that is able to cover a broad range of
hazardous compounds in very low concentrations (detection limits from ppb
(1:109) -
ppm range). Being an „I do not know what situation I am in“ – the Detector
provides the highest level of safety. |
|
|
Fast sensor response 3s, Identification of
compounds: 8s
There is no time consuming separation or trapping technology
inside. The GDA takes everything and responds in seconds. Arrive onsite
jump out of the
car and start scanning the environment. |
|
|
Broad Dynamic Range
Due to its sampling system, the GDA can deal with higher
concentrations. The first responder does not consider the concentration on
toxics around him. The GDA can take gas samples at higher concentrations
and stays in operation (important for first response action) automatically
dilution system for protection of the sensor technology |
|
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Improved identification results
By having the simultaneous response from the 4 different detection
technologies (ECZ, IMS, MOS, PID) offers the capability to achieve
a more accurate identification than any single detection technology. |
|
|
Availability
Not only the internal sampling system but also the instruments
construction as well as many additional tools ensure that the analytical
part of the
instrument stays clean and will be in operation when the user needs the
instrument. |
|
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Handling
Operation procedures, data evaluation (instruments response) and
maintenance – everything is optimized to comply with the requirements of
first
response teams. Consider these requirements to be very special and quite
different to the needs of a soldier.
Exchange of spare parts (EC, Filter, etc.) by user in some minutes |
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Safety
In any case, a signal is achieved even if the compound present is
not known to the instrument or if interfering gases are present – the
first warning is
possible due to the broad detection capability. |
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Warning concept
Response of the eight channels –Detection
Identification
alarm |
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