Honeywell XNX - Page 51

XNX Universal Transmitter Quick Start Guide
51
This section describes how to calibrate MPD flammable sensors fitted to the
XNX. The calibration adjustments are made on the XNX’s display and gassing is
performed at the sensor. This may be locally or remotely located.
Thefollowingequipmentisrequired:
• FlowHousing(PartNo:1226A0411)
• Testgas
• Regulator
NOTE:
Zero gas and Span gas should be at roughly the same humidity levels to
avoid erroneous cell responses.
1. AttheMPD,removetheWeatherproofCapifequipped.
2. FittheFlowAdaptorontotheMPD.
Figure 49. Flow adaptor
Reverse the cap removal procedure. The following diagram shows the Flow
Adaptor accessory fitted to the MPD.
Figure 50. MPD with ow adaptor
NOTE
The Gas Calibration menu is for both Zero and Span Calibration.
3. ConnecttheFlowAdaptor(usingeithergaspipe)totheregulated
cylindercontainingaknownconcentrationofthetargetgasat
approximatelythesensoralarmpoint(e.g.50%LELMethaneinair).
WARNING
As some test gases may be hazardous, the Flow Housing outlet should exhaust to a safe area.
4. FollowtheprocedureinSection8.1forbothZeroandSpan
calibrations.