1、 Installation precautions

1. Adaptation to environmental conditions
   • temperatureThe working temperature range is usually -10 ℃~+40 ℃ (some models support -30 ℃~+70 ℃). Avoid installing in high temperature (such as near heat sources) or low temperature (such as outdoor uninsulated environments) areas to prevent measurement errors or seal failure caused by material thermal expansion and contraction.
   • humidityRelative humidity ≤ 85% (no condensation), high humidity environments require the installation of protective covers or the selection of sensors with IP67 or higher protection levels to prevent internal circuit short circuits or corrosion.
   • Corrosive gasKeep away from chemically corrosive gases such as chlorine and hydrogen sulfide. If necessary, use sensors with stainless steel casings or anti-corrosion coatings.
   • dustproofIn places with high levels of dust (such as cement plants and mines), it is necessary to regularly clean the sensor surface to prevent dust from entering the interior and affecting performance.
2. Mechanical installation specifications
   • level calibrationUse a spirit level to ensure that the sensor mounting surface is level, with a tilt angle of ≤ 0.5 °, otherwise it may cause uneven load distribution, measurement errors, or sensor damage.
   • fixation method：
     • Bolt fixationWhen tightening the bolts, they should be tightened symmetrically and alternately to avoid excessive force on one side causing deformation of the sensor.
     • anti-loosening measuresApply thread locking adhesive (such as Loctite 243) or install spring washers on the bolts to prevent loosening caused by vibration.
   • limit stopInstall limit bolts or baffles in the vertical direction to limit the overload travel of the sensor (usually 150% of the rated load) and prevent deformation of the elastic body due to impact or overload.
   • Cable fixationSensor cables need to be protected with metal hoses or cable trays to avoid friction with sharp objects or being crushed by heavy objects. At the same time, sufficient slack should be reserved to prevent tensile damage.
3. Electrical Connection Specification
   • Shielding treatmentThe sensor signal line needs to use shielded cables (such as RVVP type), with one end of the shielding layer grounded (usually at the instrument end) to prevent electromagnetic interference (such as frequency converters, motors) from affecting measurement accuracy.
   • terminal block：
     • Use dedicated wiring terminals or plugs to ensure good contact and no looseness.
     • Avoid multiple wires and winding them around terminal blocks to prevent virtual connections or short circuits.
   • power supply voltageStrictly follow the instructions to provide a stable power supply (such as DC 10V ± 0.1V). Excessive voltage fluctuations may cause output signal drift or sensor damage.

2、 Precautions for use

1. Load matching
   • Range selectionThe rated load of the sensor should be greater than 120% to 150% of the actual maximum load to avoid long-term use close to full range, which may cause fatigue of the elastic body or decrease in accuracy.
   • Partial load limitationEnsure that the load is evenly distributed at the center of the sensor, with a bias angle of ≤ 5 °. Otherwise, choose a sensor with strong anti bias ability (such as spoke type) or adjust the installation structure.
   • dynamic loadFor loads with frequent impacts (such as hoppers and mixers), sensors with good dynamic response (such as shear beam type) should be selected, and buffering devices (such as rubber pads) should be installed to reduce the impact force.
2. overload protection
   • mechanical protectionInstall anti-collision beams or limit switches above the sensors to prevent sensor overload caused by material stacking or equipment failure.
   • Electrical protectionConnect a fast fuse (such as 1A/250V) in series in the sensor power supply circuit to prevent short-circuit current from burning out the internal circuit.
   • Software limitsSet an overload alarm threshold in the weighing instrument (such as 110% of the rated load), and automatically shut down and sound an alarm when exceeding the limit.
3. Environmental interference avoidance
   • electromagnetic interferenceKeep away from strong electromagnetic sources such as high-power motors, frequency converters, and welding machines. If necessary, install magnetic rings or use filters near sensors.
   • Temperature drift compensationFor scenarios with high precision requirements (such as laboratory weighing), sensors with temperature compensation function or temperature calibration through instruments should be selected.
   • Vibration interferenceIn places with high vibration (such as near a press machine), anti vibration sensors (such as column type) or shock-absorbing platforms should be selected.

3、 Maintenance and upkeep

1. regular cleaning
   • surface cleaningWipe the surface dust of the sensor with a dry cloth every month to avoid using chemical solvents (such as alcohol) to corrode the housing.
   • internal cleaningIf water or foreign objects enter the sensor, it must be disassembled and cleaned by professional personnel. It is strictly prohibited to disassemble it by oneself, which may cause sealing failure.
2. Calibration and Calibration
   • Initial calibrationAfter new installation or maintenance, standard weights (such as M1 level) should be used for four point calibration (no-load, 25%, 50%, 100% range) to ensure that the output signal linearity meets the requirements.
   • Regular re inspectionConduct a re inspection every six months or one year, and adjust or replace sensors with decreased accuracy in a timely manner.
   • Angle correctionFor systems using multiple sensors in parallel (such as car scales), angle correction is required to ensure consistent output from each sensor.
3. troubleshooting
   • No output signalCheck the power supply voltage, whether the wiring is loose, and whether the sensor is damaged (measure the input/output impedance with a multimeter, which should be within the range specified in the manual).
   • Unstable outputCheck for vibration interference, good cable shielding, and sensor moisture.
   • zero driftCheck if the sensor is affected by lateral force or temperature, and if necessary, reset or replace the sensor.

4、 Safety precautions

1. Electric shock prevention
   • The sensor housing needs to be reliably grounded (grounding resistance ≤ 4 Ω) to prevent electric shock accidents caused by leakage.
   • During maintenance, the power supply must be cut off and live operation is strictly prohibited.
2. Explosion proof scenario
   • In flammable and explosive places such as chemical plants and gas stations, explosion-proof sensors (such as Ex ia IIC T4) should be selected, and explosion-proof electrical installation specifications should be strictly followed.
3. Prevent mechanical damage
   • Avoid stacking heavy objects or stepping on the sensor to prevent deformation of the elastic body or cable breakage.
   • Special packaging boxes should be used to secure during transportation to prevent damage to internal components caused by severe vibrations.