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M102E/M501 TRS GETTING STARTED
(Addendum to M101E Manual - P/N 04740 Rev A)
CAUTION
The exhaust from the instrument needs to be vented outside the
immediate area or shelter surrounding the instrument and conform to all
safety requirements using a maximum of 10 meters of 1/4” PTFE tubing.
9. Attach the sample line to the sample inlet port. Ideally, the pressure of the sample gas should
be equal to ambient atmospheric pressure.
NOTE
Maximum pressure of any gas at the sample inlet should not exceed 1.5 in-Hg above
ambient pressure and ideally should equal ambient atmospheric pressure.
In applications where the sample gas is received from a pressurized manifold, a vent
must be provided to equalize the sample gas with ambient atmospheric pressure before
it enters the analyzer. The vented gas needs to be routed outside the immediate area or
shelter surrounding the instrument.
10. Attach zero air and span gas supply lines as appropriate (see Figures 3-5 & 3.5).
• Zero air and span gas inlets should supply their respective gases in excess of the 700
cc
3
/min demand of the analyzer. Supply and vent lines should be of sufficient length and
diameter to prevent back diffusion and pressure effects.
• For this type of analyzer, zero air and span gas are defined as follows:
SPAN GAS
• While it is possible to calibrate the M102E using SO
2
as the span calibration gas by setting
the analyzers gas measurement mode to SO
2
, Teledyne Instruments recommends that H
2
S
be used and that calibration operations be carried out with the analyzer’s TRS gas
measurement mode selected. Please note that verifying converter efficiency requires that
the instrument be calibrated on both TRS and SO
2
, and the slope factors compared
between the TRS and SO
2
modes
.
• It is recommended that the H
2
S span gas be equal to 90% of the analyzer’s selected
reporting range.
• O2 is a quenching agent in fluorescent Sulfur analyzers. If the balance gas is pure
nitrogen, then false positive readings will result, both at zero and span. Therefore the user
should either use cylinders with zero air as the balance gas, or should use higher
concentration cylinders with an N2 balance, and dilute further with zero air using a
calibrator, such as the TAPI M700.
EXAMPLE: If the selected reporting rang is 0 ppb Æ 500 ppb, an appropriate span gas
concentration would be 450 ppb H
2
S.
Cylinders of calibrated H
2
S gas traceable to NIST-Standard Reference Material specifications
(also referred to as SRM’s or EPA protocol calibration gases) are commercially available. Table
3-4 lists specific NIST-SRM reference numbers for various concentrations of H
2
S.
05514 Rev A1 13