The following is a detailed description of common faults and solutions for density scales, covering troubleshooting ideas and operational points for core issues:
1、 Deviation or instability of weighing results
Root cause analysis
Environmental interference: Airflow disturbance, tabletop vibration, or electromagnetic interference can affect the signal acquisition of precision sensors.
Calibration failure: Long term use may cause temperature drift or mechanical wear, resulting in deviation of calibration parameters.
Sample factors: incomplete compaction of powder, formation of meniscus due to liquid surface tension, and loss of volatile sample mass.
Solution
Optimize environmental conditions: Place the balance inside a windproof cover, away from the earthquake source (such as a centrifuge), and avoid direct sunlight; If high-precision measurement is required, the built-in filtering function can be enabled to suppress short-term fluctuations.
Re calibration: Use standard weights for multi-point calibration (zero point, full range, and intermediate value), following the "preheating no-load stability loading calibration" process.
Standardized sample processing: Solid samples are lightly shaken and compacted, narrow mouthed containers are used to reduce surface area for liquids, and rapid weighing mode is used to shorten exposure time for volatile samples.
2、 Display screen abnormality (no display/garbled/flashing)
Root cause analysis
Power supply issue: Poor contact of power cord, unstable voltage, or blown fuse.
Circuit board malfunction: Moisture can cause a short circuit in the circuit, or aging and virtual soldering of components.
Firmware error: Abnormal power outage causing program crashes or data loss.
Solution
Basic inspection: unplug and plug the power cord test interface, replace the fuse with the same specification; Use a multimeter to check if the input voltage meets the equipment requirements.
Dehumidification treatment: If moisture is suspected, turn off the machine and place it in a drying oven at 50 ℃ for 4 hours. Do not use baking to avoid damaging the components.
Reset system: Long press the reset button to restore factory settings, and if necessary, reinstall the firmware through software (technical support guidance only).
3、 Repetitive error exceeds the tolerance (significant differences in multiple measurements of the same sample)
Root cause analysis
Unstable installation of the weighing pan: the hook is misaligned with the sensor axis, or the damper is stuck due to oil stains.
Sensor fatigue: Overloading impact causes deformation of elastic components.
Temperature drift: The laboratory temperature difference is too large and exceeds the compensation range (generally within ± 3 ℃).
Solution
Mechanical adjustment: Remove the scale pan to check the flexibility of the hook, and wipe the damper piston with anhydrous ethanol; Confirm that the maximum weighing value has not been exceeded.
Linear testing: Load standard weights in stages from no-load to full load, and observe whether the nonlinear errors in each section exceed the standard.
Temperature control improvement: Move the balance to a constant temperature area, preheat for 30 minutes, and then perform precise measurements.
4、 Button malfunction or slow response
Root cause analysis
Panel contamination: Dust seeps into the gaps of the buttons, hindering the contact of conductive contacts.
The motherboard load is too high: the accumulation of backend data processing tasks causes delays in frontend instructions.
Solution
Cleaning and maintenance: Use a cotton swab dipped in a small amount of alcohol to gently wipe the gaps between the buttons to prevent liquid from flowing into the circuit board.
Performance management: Turn off unnecessary functions such as automatic printing and data transfer, and regularly restart to release memory resources.
5、 The density calculation result deviates significantly from the theoretical value
Root cause analysis
Reference medium density setting error: For example, when measuring in water, the current water temperature's ρ value was not entered.
Lack of buoyancy compensation: Air buoyancy has a significant impact on metal/high-density samples, and corresponding correction modes need to be activated.
Hanging basket adsorbing bubbles: Residual bubbles in the material pores during immersion measurement result in a larger drainage volume.
Solution
Verify parameters: Obtain the reference liquid density by checking the table based on the actual temperature, and enable the air buoyancy compensation function.
Degassing treatment: Boil or vacuum degas the sample before measuring to ensure that the liquid fully infiltrates the surface of the sample.
6、 Daily prevention and maintenance
Regular verification: Send to a third-party metrology institution for verification every year and retain the certificate of conformity.
Protective measures: After weighing, promptly put away the weighing pan to prevent dust deposition; Use corrosion-resistant trays for corrosive samples.
Record logs: Establish a usage ledger to record each calibration, maintenance, and abnormal situation, facilitating the tracing of fault patterns.
Through the above systematic investigation and standardized operation, the stability and measurement accuracy of the density balance can be effectively improved. For complex faults, it is recommended to contact the manufacturer's engineer for on-site maintenance to avoid secondary damage caused by self disassembly.