Honeywell MPD Series User Manual

MPD Operating Manual
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7.3 MPD-CB1 Flammable Sensor Operational Life
The pellistors used in the ammable gas sensor can suffer from a loss of sensitivity
when in the presence of poisons or inhibitors, e.g. silicones, suldes, chlorine, lead
or halogenated hydrocarbons. The pellistors are poison resistant to maximize the
operational life of the ammable sensor. A typical operating life, subject to the
presence of poisons/inhibitors is 36 months.
7.4 Meter Multiplication Factors for MPD-IF1
It is possible to apply a linear cross reference factor to the output of a sensor
characterized for propane and achieve the results shown in the graph below.
Reasonable accuracy is maintained to at least the 50% LEL equivalent values of
the cross-referenced gases.
Figure 12. MPD-IF1 (Propane) Sensor with linear cross-reference factor applied
Use the following multiplying factors to cross-refer to the propane reading:
Gas
Multiplication
Factor
Ethylene 5.43
nButane 0.98
nPentane 0.93
Table 4. Multiplying Factors
CAUTION
• These factors only apply to gas concentrations expressed in % Volume terms.
• When using a linear cross reference factor the temperature compensation is
based upon propane, and there may be errors at temperatures away from the
calibration temperature.
NOTe
Honeywell Analytics recommends that users verify the accuracy of
their instruments using test gases wherever possible. Cross-referred
measurements should be used as a guide only, not as absolute values.

Honeywell MPD Series Specifications

General

Brand	Honeywell
Model	MPD Series
Category	Accessories
Language	English