Installation and Start Up
| 3-29
Periodic STEAM BLOW BACK Diagram
Per1 Per2 Per5 Per6 Per9 Per10
Per11
Blowback Timer times OUT
and Zero Period<> 0
If using the automatic steam blowback function, do not set Blowback
Interval to a value less than 16 or run the cycle more than once a day.
If your analyzer requires steam blowback to run more than once a
day, please contact the Ametek Service Department.
Calibration Span Adjustment
The Model 888 has an optional calibration span adjustment that is per-
formed manually. Use cylinders of H
2
S and SO
2
of known concentrations
to validate and/or adjust the calibration of the analyzer.
Potentially lethal concentrations of toxic gases such as hydrogen
sulfide (H
2
S) and sulfur dioxide (SO
2
) will be present in the ana-
lyzer sample system and in the calibration gas supply system. Only
personnel who are adequately trained in the handling of these gases
should perform this procedure.
Calibration Gas Requirements
Recommended calibration gas mixtures are H
2
S in nitrogen and SO
2
in
nitrogen (as separate mixtures). H
2
S or SO
2
concentration should be about
80% of the full-scale measuring range for that component. The delivery
pressure for the calibration gas should be adjustable from 0 to 10 psig.
Calibration gas mixtures more than six months old are unreliable and
should not be used.
!
WARNING
!
!
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