Mike Dolt Enterprises
Mike Dolt Enterprises
User: mannyb, Location: Florida
Asked on: Tuesday, June 1, 2021 at 8:13 am EDT
Answered on: Thursday, June 20, 2024 at 11:24 am EDT
Question: Anyone experienced with fuel systems and fuel dispensers for C stores. A customer is having issues with alarm probe on their fuel monitoring system. The probe monitors fuel level but when 2 fuel grades are selected the probe goes into alarm but everything is working properly and for precautions they have replaced wiring and probes but still show alarm. The fuel monitoring equipment has been tested and show no problems so its suspected to be interfernce in wiring, The probe wiring and motor wiring are ran in separate conduits. The grpunds have all been checked for both LV at probes and HV for STPs. My question is how would you test for interference in a LV line?? i hope i explained the issue correctly. I am in a rush this morning.
Testing for Interference in a Low-Voltage (LV) Line1. Disconnect Probe Wiring
Disconnect the probe wiring from the fuel monitoring system. Ensure that the probe wires are not touching any other wires or surfaces.
2. Measure Voltage
Using a voltmeter, measure the voltage between each probe wire and a known good ground. The voltage should be within the normal operating range for the system.
3. Induce Interference
Bring a device that emits electromagnetic interference (EMI) close to the probe wiring. This could be a cell phone, cordless phone, or other electronic device. Observe the voltmeter readings while the interference is nearby.
4. Identify Interference Source
If the voltmeter readings fluctuate or deviate from normal when the interference is introduced, the source of the interference is likely nearby. Move the interference source away from the probe wiring and observe the voltmeter readings.
5. Eliminate Interference
Once the source of the interference is identified, take steps to eliminate it. This could involve: Shielding the probe wiring from the interference source Re-routing the probe wiring to avoid proximity to interference sources Replacing the interference-emitting device with a shielded or low-EMI version
Additional Considerations: Check for proper grounding. Ensure that both the probe wiring and STP grounds are connected to a common ground point. Examine the probe wiring for any damage or corrosion. Repair or replace damaged wires as necessary.* Consult the equipment manufacturer for any specific troubleshooting recommendations or guidance. Flag for review