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F. A. Q’s / Troubleshooting
• Siren will not sound when the test button is pressed.
On T4020 / T5020 the test button must be pressed for 5 seconds before the siren will sound.
Check the 8-way green connector is fitted correctly (see wiring diagram). When R5 relays are
incorporated the siren, connection is on the front 8-way green connector.
• High level Alarm failed to sound
If the M alarm symbol is Blacked out and there is a cross through it, the unit has Alarmed
and has been acknowledged. Pressing the test button will sound the alarm and pressing
again will stop it.
• Gauge reads LOW
If the sensor is reversed wired = LOW
If the sensor is not connected = LOW
if the sensor output is less than 3.8mA = Low
• Gauge reads HIGH
If the sensor wires are broken it will read LOW
Sensor has failed / shorted out
Water ingress into the sensor reference pipe
• Display does not read litres = Blank
Water ingress into junction box shorting out gauge
Water ingress into reference port tube in sensor
Power has failed, check with a multi meter
• Gauge litres are drifting more tank ½ %
Water ingress into sensor reference pipe
Sensor is ending its life. Check milliamps
Vent on tank has blockages
High winds in the area cause pressure fluctuation, increase damping on screen settings
• Sensor replaced and gauge reads wrong / lower or Higher than it should
Work out the percentage the gauge reads incorrectly
Example - 15000L was put in and the gauge only registered 12000L.
12000/15000 = 0.8 If they have put in a 3.0m sensor in place of a 2.5m sensor,
2.5/3.0 = 0.833 so may need to change the sensor parameters in the gauge setup
• Garbled Screen Display
The display is broken up and does not show all pixels. Try power down the unit and then
back up. Usually caused by power spikes on generators.
Can be caused by incorrect RS-485 connection / disconnection (Modbus RTU)
• New gauge setup does not read correct litres
Gauge has been configured by client and the litres does not match the dip value or
calculated value in the tank. This is usually because the sensor parameters have been set
wrongly, and the “B” values have been set as the tank height rather than the SENSOR SPAN
+ “A” OFFSET. So, a 3.0m sensor should be set A 0.05 if set 50mm off the bottom of the
tanks and the “B” value would be 3.05. This is 3.0m sensor plus the 50mm offset.
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