Technical Manual

XNX Universal Transmitter
Section 3 - Calibration
93
Figure 200. Span Passed Screen
If the calibration is not successful, the Span Failed screen
will display. Selecting
✓
will return to the Span Concentration
screen to begin the span calibration again. Selecting
✖
will
exit Span Calibration and return to the Gas Calibration Menu.
Arrow indicates
gas values too low
Selecting ‘✔’ returns to
the Span Concentration
screen
Figure 201. Span Calibration Failed
Once the Zero Gas and Span calibrations are completed
successfully, the user will be prompted to:
• exit with inhibit off
• exit with inhibit on, or
• not exit.
Figure 202. Span Calibration Failed
Warning: When the XNX transmitter is placed in Inhibit Mode, alarms are
silenced. This will prevent an actual gas event from being reported. Inhibit Mode
must be limited to testing and maintenance only. Exit Inhibit Mode after testing
or maintenance activities.
3.2.3 Using the Calibration Cup
Refer to Figure 203 to attach the calibration cup:
1. Snap the calibration cup into the weather protector. The
two protrusions on the cup t into recesses in the weather
protector.
2. Attach the hose from the gas cylinder to the calibration cup.
Note that the cup’s ow is unidirectional. There is an arrow
on the bottom showing ow direction
3. Adjust the calibration ow rate
1
.
weather
protector
calibration cup
attach gas
cylinder hose
Figure 203. Attaching the Calibration Cup
1 300-375 ml/min for XNX EC sensors, 500 ±200 ml/min for XNX mV sensors, unless
otherwise directed