【 Weak current College 】 using weighing sensor cautions 】

Resistance strain gauge load sensor itself is a sturdy, durable, reliable mechanical and electrical products. But in order to ensure the accuracy of the test, we still have a lot in use to note, here are some basic requirements.
I. machinery installation
· Load cell to handle with care, especially by the alloy aluminium production of elastomers small capacity sensor, any shock, drop, on his quantitative performance can cause great damage. For large capacity weighing sensor, generally speaking, it has a large and therefore requires the handling, installation, use the appropriate lifting device (such as hand, electric hoists, etc.).
· Installation of sensor base mounting surfaces should be smooth, clean, no oil film, cellophane, etc. exist. Install base itself should have sufficient strength and stiffness, General requirements above the sensor itself of strength and stiffness.
· Level adjustment: horizontal adjustment has two aspects. First, single sensor installed base of installed plane with spirit level to adjust levels, on the other hand, refers to the multiple sensors installed base mounting surfaces to adjust to a level (level), in particular the sensor than three weighing system, but also should be aware of this, the main purpose is to enable the sensor on the basic load.
· Each weighing sensor load directions are OK, but we use, be sure to load in the direction of load. Transverse force, additional bending moment, torque force should be avoided.
· As far as possible have the automatic positioning (reset) the role of structural parts, such as ball bearings, spherical plain bearings, positioning fastening devices, etc. They can prevent some lateral forces on the sensor. To note: some lateral force was not caused by a mechanical installation, such as the thermal expansion due to lateral force, wind-induced lateral force, and some of the container class weighing on Blender of vibration-induced lateral force that is not a mechanical installation.
· Some weighing scales must be received on some form of attachments (such as container scales of conveying pipes, etc.), we should let them in the direction of loading spindle sensor on the soft, as far as possible in order to prevent them "eat" the real load sensor GmbH and cause errors.
· Weighing sensor around should try to set some "bezel", even with thin metal plate covering the sensor. This prevents debris taint the sensor and some movable parts, but this kind of "contamination" tends to make the movable part of the movement of sorts, but affect the weighing precision.
The system has no movement of sorts, you can use this method of identification. That is, the scales on the plus or minus about a thousandth of a rated load see weighing indicator is reflected, reflected on the moving parts are not affected by the "contamination".
· Weighing sensor although there are certain overload capacity, but in the weighing system installation process, should prevent overloading of the sensor. It is important to note that even a short time overload, it can cause permanent damage to the sensor. During installation, if necessary, you can use an and sensor height pad instead of the sensor, in the end, then turn on the sensor.
In normal working hours, the sensors are generally set overload protection of mechanical structures.
· If a fixed sensors used in screw, requires a certain amount of fastening torque and screw should get some swing thread depth. In General, fixed screw screw as a result of the use of high-strength.
· Sensor should hinge copper wire (cross-sectional area of about 50mm2) electrical bypass to protect them from welding currents or harm caused by lightning.
· Sensors in use, you must avoid the intense radiation, particularly the strong thermal radiation of one side. II. electrical connection · sensor signal cable, and strong electric power cable or power line parallel layout (for example, do not put the sensor signal lines and strong electric power cables and the control line within the same pipeline). If they must be placed in parallel, then the distance between them should be kept above and 50CM signal cable with a metal pipe set up.
Regardless of the circumstances under which the power and control cable should be stranded up to 50 kg/m, transition
· If the sensor signal line extension, you should use special sealing cable junction box. If no such connection box, and cable and cable directly access (soldering end), the moisture-proof seal of special attention, good insulation resistance after inspection, and the need to achieve standard (2000 ~ 5000M) and, if necessary, should be re-calibration sensor.
· If the signal cable is very long, and to guarantee a high measurement accuracy, consider using a relay amplifier cable compensation circuit.
· All the way to display the circuit or the wires from the circuit, shielded cables must be used. Shielded cable for connecting and grounding should be reasonable. If it fails the mechanical frame ground, in the ground, but the shielded wire cross join is not grounded, after floating empty.
Note: there are 3 sensor is full and the join method, the sensor itself is a 4-wire system, but in the junction box into 6-wire connection.
Sensor output signal readout circuit should not and can produce strong interference device (such as "controlled silicon, contactors, etc.) and have considerable heat generated by the devices in the same case, if this is not guaranteed, you should consider in their set of baffle isolation and tinei placed fans.
· For measuring sensor output signal circuit, where possible, configure a separate power supply transformer, instead and contactor etc devices sharing the same main power supply.