SECTION 5: SYSTEM CONTROL ELECTRONICS
YZ Systems Milton Roy • 201 Ivyland Road • Ivyland, PA • USA • 18974 • P: 281.362.6500 • www.yzsystems.com
NJEX ZEO Version 04/13/2021
Page 45
Note
: If the controller does not accept the calibration value, the voltage at the input terminal is
outside of the calibration range of 3.0V-5.5VDC (12 mA - 22 mA).
3.3 - Pulse Input Sensor Calibration
Important:
Many factors affect the signal between the signal source and the NJEX
ZEO system. Elements of the signal electrical system such as the gauge and length
of the wire, isolation barrier, grounding, transient voltages, and the condition of the
signal generated by the flow device can affect the signal and how that signal is received by the
NJEX System. To truly calibrate the NJEX System to the signal, use only the flow equipment that
will be part of the odorization system such as a flow computer, RTU, PLC, pulse index drive, or
differential pressure transducer.
Note
: Calculating the Pulse Input Frequency is required to calibrate the system. See the example
on the next page on how to calculate this value.
To begin calibrating the pulse flow input,
press the Select Key from the home
screen to open the Main Menu
3.3.1. Navigate to the Calibration
Menu and press the Select
Key
3.3.2. Select the Flow Signal Menu
3.3.3. Select the Flow Signal Type
Pulse.
The
selected
parameter will have a filled
circle displayed next to it.
3.3.4. Using the navigation arrows,
select
Pulses/sec
or
Pulses/min. The selection is
determined when calculating
the
required
pulses
to
calibrate. See the next page
for an example on calculating the span frequency.
3.3.5. After completing the span adjustment calibration calculation, use the navigation arrows
to navigate to the Span Adjustment value.
3.3.5.1. Press the Select Key to edit the Span Adjustment value. When editable, the
value will have a dark background and be displayed with light text. Press (or
hold for large changes in value) the Up Arrow Key and Down Arrow Key to modify
the Span Adjustment value to the desired value. Press the Select Key to confirm
the value and the Span Adjustment will return to displaying as dark text on the
default background.
Figure 28 Pulse Flow Signal Calibration Menu
