Purpose:

Define troubleshooting steps when a user encounters an E5 error. E5 - Exceeds Empty

Background:

The Pulse TLM calculates a tank volume. In order to calculate this volume it must convert its distance measurement into a fluid height. In the case that a
TLM measures a distance that is further than the tank height the TLM will flag an E5 error to notify the user that it has measured a tank that is less than
empty.

Troubleshooting:

• The Tank Height may be set incorrectly. Double check the tank settings.
• The TLM may be mounted at an angle (greater than 2 degrees) relative to the surface of the fluid. This can cause the signal to read further than
  expected, or for the echo to be lost.
• Tank is near Empty
  • The Pulse TLM has a measurement specification of +/-1.5 in. If the fluid is within 1.5" of empty it could be reading that the tank is past empty.
  • Change Tank Height Parameter to 2x expected. Take a manual measurement, and take note of the fluid height. Measured distance = Tank height - Fluid Height. If Measured Distance is about the tank height, it supports the tank being near empty as the cause for the E5 message.
    • Adjusting the offset could alleviate E5 errors from being near empty. This could result in a slightly less accurate measurement at other tank levels.
    • In this case the exceeds empty is arguably not an issue and could be ignored by the user.
• Tank too full
  • Measurement issues can arise if the fluid gets to within 5" of TLM. The manual highlights the minimum measurement range of the TLM is 12.7 cm (5 in.).
  • If a fluid is closer than 5", it is possible for the TLM to measure the bottom of the tank through the fluid. This is referred to as fluid
    coupling of the sensor signal.
    • Note: Signal is likely to propagate through the fluid at a slower rate than air resulting in a further distance than the tank height. Therefore, the user may see a measurement that looks as though it exceeds the empty.
    • Testing: Change Tank Height Parameter to 2x expected. Take a manual measurement, and take note of the fluid
      height. Measured distance = Tank height - Fluid Height. If Measured Distance is greater than tank height then it would support fluid coupling as the cause for the E5 message.
  • Further offsetting the TLM from the fluid could alleviate fluid coupling of the sensor signal.
  • Setting a lower max fill point on the tank can alleviate this issue.

Notes

There has been some observation that TLM to TLM has slightly different performance at very close range (<5 in. distance). It is recommended that
measurements be at least 5 in. away from TLM Sensor.