Teledyne manual M102E/M501 TRS, Getting Started, Span Gas, Rev A1

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 cc3/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 SO2 as the span calibration gas by setting the analyzers gas measurement mode to SO2, Teledyne Instruments recommends that H2S 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 SO2, and the slope factors compared between the TRS and SO2 modes.

•It is recommended that the H2S 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 H2S.

Cylinders of calibrated H2S 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 H2S.

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