SECTION 5: SYSTEM CONTROL ELECTRONICS
YZ Systems Milton Roy • 201 Ivyland Road • Ivyland, PA • USA • 18974 • P: 281.362.6500 • www.yzsystems.com
Page 44
NJEX ZEO Version 04/13/2021
3.2.4. Select the Flow Signal Type Analog.
The selected parameter will have a
filled circle displayed next to it.
3.2.5. When Analog is selected, the screen
will display instructions to calibrate.
Select Zero to calibrate the zero set
point. The N-400 controller is
programmed for 0% of flow to
directly correspond to 1.00 VDC (4.0
mA) at the flow input terminal board
TB8 terminals #2 and #3. Refer to
the
3.2.5.1. When
the
Zero
option
is
selected, instructions to calibrate
the zero set point are displayed
on the screen. To calibrate the
zero set point, apply 1.00 VDC
(4.0 mA) to TB8 terminal #2(+) and terminal #3(-).
3.2.5.2. After the signal has been applied, navigate to the Apply Calibration selection and
press select.
3.2.5.3. If calibrated reading is within the acceptable calibration range, the calibration will
be applied and the box next to Calibrated will display a check mark.
Note:
If the controller does not accept the calibration value, the voltage at the input terminal is
outside of the calibration range of .6V -1.4VDC (2.4 mA - 5.6 mA).
3.2.6. Select span to calibrate the span
set point. This adjustment is used
to calibrate the N-400 controller
for 100% of metered flow in the
pipeline. The N-400 controller is
factory calibrated for 100% of flow
to directly correspond to 5.00
VDC (20 mA) at the flow input
terminal board TB8 terminals #2
and #3. Refer to the
Control Document in Appendix B
3.2.6.1. When the Span option is
selected,
instructions
to
calibrate the span set point
are displayed on the screen.
To calibrate the span set
point, apply 5.00 VDC (20 mA)
to TB8 terminal #2(+) and terminal #3
3.2.6.2. After the signal has been applied, navigate to the Apply Calibration selection and
press select.
3.2.6.3. If calibrated reading is within the acceptable calibration range, the calibration will
be applied and the box next to Calibrated will display a check mark.
Figure 26 Analog Flow Signal Zero Calibration
Screen.
Figure 27 Analog Flow Signal Span Calibration Screen
