Fault Phenomenon: Hongda HBT120 metering is normal when cold. During precision pumping (operating temperature), concrete metering is inaccurate, with large errors, eventually leading to waste.

Troubleshooting Process:
– Checked metering sensor: sensor installed securely, no looseness.
– Checked metering bucket: bucket body not deformed, no material adhesion.
– Checked metering instrument: display normal, no fault.
– Measured sensor output signal at operating temperature: found zero-point drift.

Root Cause: Thermal drift of the strain gauge inside the load cell.

Required Parts: Load cell.