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Model 4688-IR / Model 4679-IR
Operation & Maintenance Manual
Manual #087-0007G, 10/2003
Transmitter Installation
Installation Considerations
Prior to installing GasPlus-IR, consideration should be given to the following
items when choosing its location:
1.
Orientation
- In outdoor applications always mount the instrument's optical
bench pointing downwards.
2.
Gas Density
- For gases with densities greater than air, the Instrument
should be installed approximately 18" from floor level. In these applications
care should be taken to protect the sensors from physical damage. For gases
with densities less than air, the Instrument should be installed at a high level or
close to the potential leak source. For gases with densities equal to air, mount
as close to potential leak source as practical.
3.
Potential Gas Sources
- The location and
nature of potential vapor/gas sources (e.g.,
pressure, amount, source, temperature, and
distance) need to be assessed. Locate the
transmitter where air currents are most likely to
contain the highest concentration of escaping gas.
4.
Ambient Temperature
- Ensure that the
system is located within an area that complies
with the specified operating temperature range.
5.
Vibration
- Mount the instrument in a manner
that minimizes vibration.
6.
Accessibility
- When determining mounting
location, consider future maintenance
requirements.
7.
Avoid water.
Water inside the infrared optics will adversely affect
performance. Although the optics are heated to prevent condensation on the
mirror, the use of a rain shield is still recommended for outdoor installations.
NOTE: The rain shield is included with the instrument.
8.
Avoid strong electromagnetic fields
. Although the instrument is
designed to be RFI/EMI resistant, mounting the gas transmitter near power
transformers or other strong EM fields may cause undesirable results.
9. Conduit seals and drain loops.
Explosion proof conduit and other
materials required for electrical wiring in hazardous areas should be installed
in accordance with National Electrical Code (NEC) and Canadian Electrical
Code (CEC) requirements. All conduit connections should be sealed and
contain a drain loop to protect the transmitter electronics from moisture.
10. Direct bold sunlight.
Scott Instruments recommends using a sunshade
if the instrument will be mounted in direct sunlight.
Air
Propane
Butadiene
Butane
IPA
Pentane
Hexane
Toluene
Methane
Ethane
Ethylene
Carbon Dioxide
Propylene
Acetone
MEK
Vapor Densities
Relative To Air
0.6
1.0
1.0
1.5
1.5
2.0
2.1
2.5
1.0
1.6
1.9
2.0
2.5
3.0
3.1
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