SECTION 6: TROUBLESHOOTING
YZ Systems Milton Roy • 201 Ivyland Road • Ivyland, PA • USA • 18974 • P: 281.362.6500 • www.yzsystems.com
Page 64
NJEX ZEO Version 04/13/2021
Tank Level Alarm
The set points for these alarms are adjustable in the Alarms menu of the N-400 controller. The
alarms can be set for either a Rochester gauge provided with a YZ Systems odorant tank or a
customer provided analog tank level.
CAUTION: All wiring must be in compliance with Wiring Control Document 1E-0378 in
Appendix B of this manual.
- The
Odorant Level Low Alarm
should be set between 5% to 25%. This alarm indicates a tank
level at or lower that the alarm set point.
- The
Odorant Level High Alarm
should be set between 80% to 90%. This alarm indicates a
tank level at or above the alarm set point.
-
The
Odorant Tank Cable
Alarm is enabled by default if the Odorant Level Low or High alarm
is active and indicates if communication with the tank level has been disrupted.
IMPORTANT NOTE: The Rochester tank level indication has a variance of +2% for
accuracy. If the alarm is on and the mechanical level indicator is close to the alarm set
point the alarm is probably valid and the accuracy variance is all that is being noted.
Tank Level Alarm Troubleshooting Steps
1. Verify the tank level indication on the manual tank gauge. If the level indication does not
approximately match the electronic level indication, perform the following checks.
1.1. Inspect to verify that the wiring to the controller termination strip
TB11
is still intact. Look
for loose or broken wires at
TB11
, pin number
2
(Red Wire)
,
3
(Black Wire)
, and
1
(Shield)
. Repair any loose or broken wires.
1.2. Inspect the level sensor at the tank for possible damage or moisture in the sensor head.
Repair or replace as required if moisture is inside the sensor.
1.3. Inspect the cable between the sensor and control head for damage. Repair or replace
as necessary.
1.4. Observe the other values on the N-400 controller such as the temperature and
Verometer level, etc. for any unexpected values. If another value is found to be
abnormal, inspect the bulkhead connector to interconnect cable connections for the
presence of moisture or corrosion. If moisture or corrosion is found, correct by replacing
affected components. Simply cleaning the connection may not correct the problem
temporarily or permanently.
2. If the level indication on the manual gauge and the electronic level indication are
approximately the same, within
+
2% as indicated above, then the system is working correctly.
If you wish to change the alarm set points, or disable the alarm, proceed to the Set
Parameters section of the controller, and make necessary changes to clear the alarm.
