XNX Universal Transmitter
Proof Testing Procedure
9
Adjusting
6.1.2 Zero Gas mA Output
The procedure for zero gas is not applicable to the ECC O
2
sensor.
1. Apply zero gas to the sensor.
2. The current at the controller end should be 4.0 mA.
If the mA output is not at the expected level when applying
zero gas, perform a Zero Gas Calibration. Refer to
and
complete the procedure for a Zero Gas Calibration.
6.1.3 Calibration Gas mA Output
1. Apply calibration gas to the sensor.
2. The current measured at the controller end is related to the
percentage of gas applied.
Example: 100% of full gas concentration is equivalent to
20.0 mA. If 75% of the full scale gas concentration is applied,
the mA output should be 16.0 mA.
If the mA output is not at the expected level when applying
calibration gas, refer to
and perform a Zero Gas
Calibration and a Span Gas Calibration.
6.2 Adjusting
Perform the following procedures if 4.0 mA and 20.0 mA were
not measured at the controller end. If the correct currents were
measured, proceed to
The current must be measured at the controller end in
and
.
6.2.1 Calibrate 4.0 mA and 20.0 mA
1. From the Main Menu, select the Test Menu (
).
2. Then select Force mA output (
).
3. Adjust the current output in the column on the right until the
current at the controller end is 4.0 mA.
Figure 2. Adjusting Current
4. Once the new value is entered, use the switches to
move to the ‘
3
’ and select
✓
to set the mA output.
If the 20.0 mA output was not equal to 20.0 mA, complete steps
#3-4.
6.2.2 Zero Gas Calibration and Span Calibration
The following section outlines the steps for calibrating the attached
XNX sensors. For calibration information for specific sensors, refer
to the XNX Technical Manual.
1. If using a compressed gas cylinder, push the calibration gas
flow housing onto the bottom of the sensor and apply the gas.
2. Access the Calibration Menu.
Figure 3. Gas Calibration Menu
NOTE:
The Gas Calibration Menu is for both Zero Gas and Span Gas
Calibration.
