Infrared Intrinsically Safe Gas Detectors Type FGD3
For the detection of Hydrocarbon Gases or Carbon Dioxide
Certificate No.
BAS 01ATEX2300
II 2 G EEx iad IIC T4 (-20 deg. C <Ta< +60 deg. C)
Features
- Infrared sensors for detection of either Hydrocarbon gases or Carbon Dioxide.
- Hydrocarbon version detects a wide range of Hydrocarbon gases
- Plug-in, separately certified Ex d sensor.
- Suitable for use in Zones 1 and 2 hazardous areas.
- Three wire connection.
- Industry standard 4 to 20mA output.
- Digital display
- Single operator calibration.
- Marine version available.
- Optional weather guard available.
- Note - Unsuitable for the detection of Hydrogen - see Flammable.
Description
The
FGD 3 Infrared Gas Detector Head incorporates
the latest generation of compact sensors incorporating
infrared technology. There are two current
detectors in use, one for Hydrocarbon gases
and the other for Carbon Dioxide. The Hydrocarbon
sensor can be set to either methane or general
hydrocarbons. These two settings use different
calculations to convert the sensor signals
in to gas readings, it is important to select
the correct gas type to give accurate readings.
The detectors use the industry standard 4-20mA current
loop to convey the gas levels detected to a
control unit. This means that under zero gas
conditions 4mA is drawn from the supply, and
under full scale gas conditions 20mA is drawn
from the supply. The current varies linearly
for gas levels between zero and full scale.
The detector heads use a three-wire connection. While
the loop current supplies the power required
by the detector head electronics within the
detector head, a second supply must be provided
to power the infrared sensor and its associated
circuitry.
Marine Version
A marine version of the FGD3 is also available. This version is housed in a cast aluminium enclosure to provide higher RFI immunity where high power portable radios are used in the close confines of a vessel. The enclosure is plated and painted in order to withstand the harsh salt spray environment of the marine industry. The digital display is fitted with a sliding stainless steel front cover which remains over the display window when not being viewed thereby maintaining the RFI shielding properties of the enclosure during normal operation.
An
optional weather guard
is available for installations
exposed to the atmosphere
or contaminants and
is also suitable for
use in other areas
where hosing down takes
place. The weather
guard reduces the possibility
of water or other contaminants
entering into the gas
sensor thereby improving
the overall reliabilty
of the gas detector
in hash environments.The
weather guard is attached
with tamperproof screws
to ensure that it is
not inadvertently removed.
Collector Cone
A collector cone is available which can be fitted around the sensor inlet in order to concentrate any gas present around the sensor and hence improve the detection ability. Mounting brackets are also available.
Mounting Kits
A Swivel Mounting Bracket and Ceiling Mounting Kit is available for use with this range of gas detectors. In addition, a duct mounting kit is also available. Please contact Status Scientific Controls to discuss your particular application.
Order Codes
| Stock No. | Description |
|---|---|
| SS412 | FGD3 Carbon Dioxide Gas Detector |
| SS413 | FGD3 Hydrocarbon Gas Detector |
| SS413-M | FGD3 Hydrocarbon Gas Detector - Marine Version |
| SS475 | FGD3 Series Protective Weather Guard |
| SS429 | FGD3 Series Collector Cone |
| SS374 | FGD3 Series Swivel Mounting Bracket |
| SS375 | FGD3 Series Ceiling mounting Bracket |