XNX Universal Transmitter
Section 3 - Calibration
114
Peak Reading
Full Scale
Alarm Levels
Current Sensor
Reading
Figure 216. Bump Test Screen
2. If the difference between the reading and the applied gas
concentration is outside the acceptable limits for the application,
follow the procedures for zeroing and calibrating the sensor (see the
Zero and Span Calibration for EC/mV Sensors
section
).
3. If the reading is still inaccurate, replace the sensor (see the MPD
Sensor Cartridge Replacement
section or EC Sensor Cell
Replacement section as appropriate
).
Once the bump test is completed successfully, the transmitter will
exit the calibration procedure. Before returning to the Gas Calibration
menu, the user will be prompted to exit and turn alarm and fault inhibit
off, exit and leave the transmitter in inhibit mode, or not exit.
Caution: Exiting before the gas level has fallen below the level of Alarm 1 will cause the transmitter
to go into alarm.
Figure 217. Exiting the calibration procedure
Calibrate mA Output
Use Calibrate mA Output to adjust the milliamp output to provide
the correct output levels at peripheral devices connected to the
transmitter.
Figure 218 Calibrate mA Output Menu
To adjust the 4mA output, use the
switches to increase or
decrease the output, then use
✓
to accept the new value and move
to the 20mA setting or
✖
to discard the selection and return to the
previous menu.
Figure 219. Calibrate mA Output Screens
During installation, an mA meter must be connected in series with the
4-20 mA loop as shown below.
Control Equipment
XNX
mA
Meter
Remote end
R load
4-20 mA loop
4-20 mA loop
Figure 220. 4-20 mA loop with mA meter
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