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3.3 Solenoid Leak Detection
Problem:
The Solenoid Leak Detection alarm is designed to prevent a gross over injection of
additive, loss of additive, and the unauthorized flow of additive. The alarm is activated when a single
injection volume exceeds twice the programmed volume.
Cause:
There are several conditions that can cause this alarm:
1.
Leakage of the solenoid control valve may occur due to worn or damaged seals in the solenoid or
the presence of a foreign object inhibiting valve closure.
Product under pressure may leak in a reverse direction through the ProPAC-3 additive flow meter, falsely
indicating additive flow. Additive installations should always include a ball valve and a check installed on
the additive line at the additive injection point.
2.
Air in the additive supply lines may cause "gear rocking" in the additive flow meter. This
rocking is registered in the injector as a leak.
3.
The injection rate may be set too low for the injector to control. In this case, the injector will
enter the alarm state almost immediately after the first injection.
4
. It is possible the microprocessor’s solid-state relay that is used to energize the solenoid control
valve could fail in the energized position causing the injector to flow additive anytime the additive pump
was pressurized.
Troubleshooting:
Turn on the additive pump and open the test port on the injector (Have a bucket
ready under the test port!!!) If additive leaks from the test port, the solenoid seat is leaking. If
additive is not leaking from the test port, push the test injection button. If the injection occurs so
fast that you can't distinguish between the solenoid opening and closing, then the injection rate is
too low for the injector to control. To fix this problem, partially close the outlet ball valve on the
injector until each injection lasts for 1-2 seconds. If all else fails, the meter gears are probably
rocking back and forth due to air in the additive supply lines. A riser tube installed in the additive
supply tubing will probably solve this problem.
Summary of Contents for ProPAC-3
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