How Do Moisture and Humidity Affect PRT Performance?

Moisture and humidity are among the most damaging environmental factors affecting PRT performance, especially in outdoor, industrial, or wash-down environments. Water intrusion can cause insulation failure, electrical leakage, signal drift, unstable readings, and even complete sensor breakdown. When moisture enters the PRT probe or connection head, it reduces the insulation resistance between the platinum element and the sheath. This creates stray electrical currents that disrupt measurement accuracy and cause unpredictable drift. In high-humidity conditions, condensation forms inside the sensor, leading to corrosion, rust, and long-term damage to internal components. Moisture also changes the thermal conductivity of insulation materials, slowing response time and creating measurement errors. To resist moisture damage, industrial PRTs use hermetically sealed probes, waterproof cable glands, and high IP-rated connection heads. Sealed designs prevent water, vapor, and condensate from entering critical internal areas. Proper installation and routing also reduce moisture exposure; keeping connectors elevated and away from standing water minimizes risk. In high-humidity applications, coated or sealed cables further protect against water absorption. Regular inspection ensures seals remain intact and prevents small leaks from becoming major failures. By maintaining dry internal conditions, PRTs preserve insulation resistance, signal stability, and measurement accuracy. Understanding moisture effects and using protected PRT designs ensures reliable performance in humid, wet, or outdoor environments.