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A-10 | Model 5100 HD Analyzer
Span and Zero Tolerances:
For both a check and a calibration (i.e. either with Auto Adjust enabled or dis-
abled) the analyzer uses the following tolerances to determine what happens:
•
Zero Tolerance = 2% of full-scale range
•
Span Tolerance = 5% of applied span gas value
So, for a zero check or adjustment, the analyzer tolerance requirement is +/-2%
of full scale. For example, with a full scale range of 0-5%, the tolerance require-
ment is +/-2% of 5%, or +/- 0.1%.
For a span check or adjustment, the tolerance is +/-5% of the span gas. For ex-
ample, if 2% gas is used for span, the span tolerance is 5% of 2%, or +/-0.1%
If either the zero or span reading is outside of the required tolerances, the analyz-
er will display an alarm (which can also be tied to an alarm relay). In the case of
a span or zero check, the analyzer will display a message identifying whether the
problem was with the zero, span, or both. It will, however, return to normal op-
eration and continue to read process gas. In the case of a calibration adjustment,
the analyzer will NOT make the adjustment for a value outside of the tolerance.
It will display the alarm(s), and return to normal operation, without any zero or
span change being performed.
The user can force the analyzer to accept a zero or span (even for readings
outside of the tolerance) only by using the manual Zero/Span feature outlined in
Chapter 4. This is the only way to clear a span or zero alarm.
Flow Switch (Contact Closure) Input
This analyzer has been customized with the ability to read in a dry contact clo-
sure. To accomplish this, wire the poles of the external switch to the two wires
labelled "CONTACT CLOSURE" in the wiring enclosure (under the main elec-
tronics cabinet). Upon detecting the switch closure, the analyzer will display an
alarm message, which may also be mapped to an alarm relay.
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