Six Essential Notes for Infrared Thermometer Use
1. Try to set up some "baffles" around the infrared thermometer, and even cover the thermometer with thin metal plates.
This can prevent impurities from contaminating the thermometer and certain movable parts, which often cause discomfort in the movement of the movable parts and affect the weighing accuracy. The presence or absence of motion discomfort in the system can be determined using the following methods. Add or subtract approximately one thousandth of the rated load on the weighing platform to check if the electronic weighing display shows any response. If there is a response, it indicates that the movable part is not "contaminated".
2. All wires leading to or from the display circuit should use shielded cables.
The connection and grounding points of shielded wires should be reasonable. If it is not grounded through the mechanical frame, it will be grounded externally, but if the shielding wires are connected to each other and not grounded, it will be floating.
Note: Three thermometers are connected in full parallel, and the thermometers themselves are 4-wire, but they are replaced with 6-wire connections inside the junction box. The output signal readout circuit of the thermometer should not be placed in the same box as devices that can generate strong interference, such as controllable silicon and contactors, or devices that can generate considerable heat. If this cannot be guaranteed, it is necessary to consider setting up barriers to isolate them and installing fans inside the box. The electronic circuit used to measure the output signal of the thermometer should be equipped with independent power transformers as much as possible, and should not share the same main power supply with equipment such as contactors.
3. Infrared thermometers should use hinged copper wires (with a cross-sectional area of approximately 50mm2) to form an electrical bypass to protect them from the hazards caused by welding currents or lightning strikes. During the use of a thermometer, it is necessary to avoid strong thermal radiation, especially on one side.
4. In terms of electrical connections (such as signal cables for thermometers, they should not be arranged in parallel with high-voltage power lines or control lines (for example, do not place the thermometer signal line, high-voltage power line, and control line in the same pipeline). If they must be placed in parallel, the distance between them should be kept at least 50cm, and the signal lines should be covered with metal tubes.
What are the issues to pay attention to when using an infrared thermometer
5. Try to use structural components with automatic positioning (reset) function, such as ball bearings, joint bearings, positioning fasteners, etc.
They can prevent certain lateral forces from acting on the thermometer. It should be noted that some lateral forces are not caused by mechanical installation, such as lateral forces caused by thermal expansion, lateral forces caused by wind, and lateral forces caused by vibration of agitators on certain container scales, which are not caused by mechanical installation. Some accessories on certain scales must be connected to the scale body (such as the feeding pipeline of container scales). We should make them as soft as possible in the direction of loading the main shaft of the thermometer to prevent them from "eating" the true load of the thermometer and causing errors.
6. Handle with care, especially for small capacity thermometers made of alloy aluminum elastomers. Any impact or drop may cause significant damage to their metrological performance. For large capacity infrared thermometers, they generally have a large weight, so it is required to use appropriate lifting equipment (such as chain hoists, electric hoists, etc.) as much as possible during transportation and installation. The installation surface of the base for installing the thermometer should be flat, clean, and free of any oil film, adhesive film, etc. The installation base itself should have sufficient strength and rigidity, generally requiring higher strength and rigidity than the thermometer itself.
