1、 Key points for maintenance of density meter

1. Daily cleaning and corrosion prevention

• surface cleaningWipe the outer shell with a soft, slightly damp lint free cloth to avoid damage to the surface coating from alcohol, bleach, or abrasives.
• Probe and measuring components：
  • Immediately after each use, use specialized cleaning wipes to remove coupling agents or sample residues from the probe (such as the probe of an ultrasonic bone densitometer).
  • The surface of the transducer of the vibrating density meter needs to be regularly inspected for sediment, and powder or impurities in the gaps should be cleaned with a soft bristled brush.
• Sink and Sample Tank：
  • When not in use for a long time, empty the sink and wipe it clean to prevent bubble adhesion or algae growth.
  • Glass measuring cylinders need to be rinsed with distilled water and then inverted to dry to avoid scale corrosion; Plastic measuring cylinders should be kept away from direct sunlight to prevent aging.

2. Moisture and dust prevention

• environmental controlThe storage environment should be kept at a temperature of 5-45 ℃ and a humidity below 85% RH, avoiding direct sunlight, direct air conditioning, or strong magnetic field interference.
• Drying treatment：
  • In a high humidity environment, blow the internal circuit module with dry compressed air and place a silicone desiccant (check and replace every 2-3 months).
  • When the portable device is not in use for a long time, remove the battery and keep the power level at 40-60%, and charge and discharge it every 3 months.

3. Protection of mechanical components

• Lubrication of moving parts：
  • Apply a thin layer of anti rust oil (such as Vaseline) to the vibration guide rod, bearings, and other metal components of the compaction density meter to prevent oxidation and rust.
  • Avoid excessive adsorption of dust by lubricating grease.
• Elastic component protectionSilicone pads, rubber seals, etc. should be stored separately in sealed bags to prevent adhesion.

4. Calibration and accuracy verification

• periodic calibrationCalibrate using standard substances (such as standard quartz sand) according to the manufacturer's recommended frequency (e.g. 1-4 times per month), record the results, and establish a performance trend chart.
• zero point calibrationBefore each startup, press the reset button to reset to zero to avoid measurement errors.

2、 Key points for maintenance of sound velocity meter

1. Probe and signal system maintenance

• Probe cleaningImmediately wipe the surface of the probe with a specialized cleaning agent after use to avoid scratches or wear (minor damage may affect the accuracy of sound velocity measurement).
• signal checkRegularly check the stability of the sound speed value. If there is a sudden jump (beyond the manufacturer's diagnostic data range), the fault needs to be investigated.

2. Anti vibration and stable installation

• operating environmentAvoid strong vibrations or impacts, ensure the instrument is stable during installation, and prevent errors caused by movement or tilting.
• transport protectionShut down and disconnect the power before moving, and use a dedicated transport box to secure the equipment.

3. Power and Line Management

• Power safety：
  • Use a stable power supply of AC220V ± 10%, 50 ± 10% Hz to ensure reliable grounding of the protection terminal.
  • It is strictly prohibited to plug or unplug the power cord while the device is turned on to prevent circuit damage.
• Cable inspectionRegularly check whether the power cord plug and cable are damaged, wrap them neatly and fix them to avoid bending and breaking.

4. Environmental adaptability adjustment

• temperature controlMaintain the ambient temperature between 15-30 ℃ to avoid measurement deviation caused by thermal expansion and contraction of the probe.
• dustproof measuresCover the equipment with a dust bag to prevent dust from entering and affecting performance.

3、 General maintenance principles

1. Dedicated personnel for safekeeping and recordingDesignate a dedicated person to be responsible for equipment maintenance and establish maintenance records (recording cleaning, calibration, repair dates and contents).
2. Operating Specifications：
   • Ensure that the surface of the sample or object is smooth and undamaged during measurement, and place it in the center of the measuring table.
   • Avoid direct contact of static objects with the equipment to prevent interference.
3. emergency response：
   • Check the probe connection and coupling agent status when the measurement is unstable.
   • Confirm the power connection when unable to power on, and try restarting the system when an abnormal display appears.
4. Professional repairNon professionals are not allowed to disassemble the equipment. If there is hardware damage or calibration deviation, please contact the manufacturer or professional organization for handling.

4、 Long term suspension of special treatment

• cleanDisassemble detachable components (such as measuring cylinders, brackets) and clean the gap powder with a soft bristled brush and compressed air.
• Component protection：
  • Apply rust proof oil to metal components and wrap electronic components in anti-static bags.
  • Place the glass measuring cylinder into the shock box and seal it separately with a silicone pad.
• Enable verificationBefore reuse, conduct an "empty machine test run" to verify accuracy with standard substances. If the deviation exceeds the standard, recalibrate.