14
Target Gas
Recommended
maximum sample
line (m)
End of line
particulate filter
(P/N 0780248)
End of line
particulate
Teflon filter
(1830-0055)
Silane
30
YES
**
Silane (low level)
30
YES
**
Sulfur Dioxide
30
NO
YES
Sulfur Tetrafluoride
5*
NO
YES
Tetra Ethyl Ortho Silicate
30
YES
**
Tungsten Hexafluoride
5*
NO
YES
5.5 Local Detector Option
The MIDAS
®
gas detector can also be used to monitor for gas at the location of the detector. To do this an inline
filter is simply connected to the sensor cartridge gas inlet port. The external dust filter part number is 780248 for
normal gases and 1830-0055 for corrosive gases. The area around the detector is then being monitored
as opposed to a sample being drawn from a remote location.
Diagram 9. Local gas detector option
MIDAS-T-001 transmitter installed with
in line particulate filter for local ambient
monitoring mode
* Recommend to keep the sample lines as short as possible where the RH condition at the sample point is high (above
<50%RH); there will be some sample loss due to absorption onto the sample line.
** These gases can use either filter.
Table 4. In-line filter recommendations (cont.)
