Simtronics GD1 MK3, Operating Manual

Page: 62 / 76

GD1 Page 62 of 76 850-816926-EN R06
measure absorption from single absorption lines, eliminating direct interference from
other gases and subsequent false gas alarms.
The laser diode has a very long service life and requires no recalibration or replacement.
The GD1 technology enables ultra-fast detection to single gas species at low
concentrations. The laser diode is tuned in wavelength and temperature to match the
absorption line to be measured. The laser is then scanned across the absorption line. The
line itself is carefully selected to ensure there is no interfering absorption in the scan area.
The GD1 continuously monitors the measuring path and the optical and electronic
functions. The detector will always show correct gas concentration as long as there are no
error messages.
The transmitter and receiver optics are heated to keep the optical surfaces free from dew,
snow and ice.
Maintenance will normally only consist of cleaning the optics. The detector gives an error
message if cleaning is required.
The GD1 offers digital communication capabilities along with standard 4-20 mA analogue
current loops, to aid installation, setup, configuration and servicing.
10.2. Application areas
Area monitoring of:
- Oil and gas installations onshore and offshore
- Petrochemical plants
- Chemical plants
- Refineries
- Pipelines
- Marine
- Waste disposal plants
- Process water facilities
- General industry