1、 Installation precautions

1. Location Selection
   • The sensor should be installed near the compressor exhaust port to ensure accurate reflection of the exhaust temperature.
   • Avoid installation at bends in pipelines, excessive vibration, or direct contact with heat sources (such as electric heating elements) to prevent measurement errors.
   • Ensure that the sensor probe is in full contact with the surface of the pipeline or exhaust port, and if necessary, use thermal grease or heat shrink tubing to fix it.
2. Avoid interference
   • Stay away from strong electromagnetic fields (such as frequency converters, motors) or high-frequency signal sources to prevent signal interference.
   • Avoid direct contact with refrigerant pipelines to prevent sensor damage caused by refrigerant leakage.
3. protective measures
   • In high temperature, high humidity, or corrosive environments, sensors with high protection levels (such as IP65/IP67) should be selected and equipped with protective covers.
   • Ensure that the sensor cable is kept away from high-temperature components to avoid aging or short circuits.

2、 Precautions for Electrical Connections

1. Wiring specifications
   • Strictly follow the wiring instructions of the sensor and distinguish between positive and negative poles (for example, for PT100 sensors, pay attention to the three wire connection method).
   • Use shielded cables and single ended grounding to reduce electromagnetic interference.
   • Avoid cables that are too long or excessively bent to prevent signal attenuation.
2. Voltage matching
   • Confirm that the working voltage of the sensor matches the control system (such as 24V DC or 120V AC) to avoid overvoltage damage.
   • If the sensor has a built-in signal conditioning circuit, a stable power supply must be provided.
3. Insulation treatment
   • The wiring terminals should have good insulation to prevent short circuits or leakage.
   • Regularly check the sealing of junction boxes in humid environments.

3、 Precautions for use and maintenance

1. temperature range
   • Ensure that the working temperature of the sensor does not exceed its rated range (such as -50 ℃~150 ℃), as exceeding this range may result in damage.
   • Avoid frequent thermal shock (such as frequent system start stop) to prevent sensor thermal stress fatigue.
2. periodic calibration
   • Calibrate the sensor with a standard temperature source (such as a dry well calibrator) every 1-2 years to ensure measurement accuracy (usually within ± 0.5 ℃).
   • Record calibration data and establish maintenance files.
3. Cleaning and Inspection
   • Regularly clean the surface dust or oil stains of the sensor to prevent an increase in thermal resistance.
   • Check whether the sensor probe is loose, deformed or corroded, and replace damaged parts in a timely manner.

4、 Safety precautions

1. Power off operation
   • During installation or maintenance, the power must be cut off to prevent electric shock or equipment misoperation.
   • Use insulated tools, wear protective gloves and goggles.
2. Explosion proof environment
   • In flammable and explosive places (such as chemical and oil and gas industries), explosion-proof sensors (such as Ex ia IIC T4) should be selected and explosion-proof regulations should be followed.
   • Avoid generating electric sparks or high-temperature surfaces.
3. emergency response
   • If sensor failure causes system alarm or shutdown, immediately shut down for inspection to avoid compressor overheating and damage.
   • Backup sensors should be tested regularly to ensure they can be replaced at any time.