Teledyne 501 TRS, Operation Manual, Page: 30 / 111

Pneumatic Connections
Teledyne API - T102/501 TRS, Addendum to T101 Operation Manual
28
Table 4-2. NIST-SRM's Available for Traceability of H2S & SO2 Calibration Gases
NIST-SRM
4
TYPE
NOMINAL
CONCENTRATION
2730
2731
Hydrogen sulfide in N
2
Hydrogen sulfide in N
2
5000 ppb
20 ppm
ZERO AIR
Zero air is similar in chemical composition to the earth’s atmosphere but without the
gas(es) being measured by the analyzer, in this case total reduced sulfur (TRS). While
TRS typically includes Hydrogen sulfide (H
2
S), Dimethyl sulfide (CH
3
)
2
, Dimethyl
disulfide (CH
3
)
2
S
2
and Methyl mercaptan (MeSH), CH
4
S many other gases fall into this
category as well. Other interferent gases may be present in ambient air as well.
To ensure that high quality zero air is available, a zero air generator such as the TAPI
Model 701 should be used.
If your analyzer is equipped with an IZS option, it is capable of creating zero air that is
adequate for performing informal calibration checks, but a zero air generator such as the
TAPI Model 701 is still recommended for performing formal calibration operations.
Once the appropriate pneumatic connections have been made, check all pneumatic
fittings for leaks using a procedure similar to that defined in the
Detailed Pressure Leak
Check section in the T101 Manual - PN 07266.
4.1.1.1. Connections with Internal Valve Options Installed
If your analyzer is equipped with either the zero/span valve option (Option 50) or the
internal zero/span option (Option 51), the pneumatic connections should be made as
shown in Figure 4-3, Figure 4-4, and Figure 4-5.
Figure 4-3. Basic Pneumatic Connections for Units with Zero/Span Valve Option
07267B DCN6485