The primary differences between the Honeywell T775-SENS-WR and T775-SENS-WT temperature sensors are their water protection levels and lead lengths:

• T775-SENS-WR: This is a water-resistant sensor equipped with 5-foot leads.

  T775-SENS-WT: This is a watertight sensor featuring 6-foot leads.

Both sensors are designed for use with Honeywell's T775 Series 2000 electronic standalone controllers in commercial heating and cooling applications. They share common features, including:

• A 1/2 inch (6.35 mm) stainless steel probe filled with thermally conductive epoxy.

• A resistance of 1,097 Ohms PTC at 77°F (25°C).

The choice between the two depends on the specific environmental conditions of your application. The T775-SENS-WT offers a higher level of water protection compared to the T775-SENS-WR.

The difference between water-resistant and watertight mainly comes down to the level of protection against water:

• Water-Resistant:

  • Offers some protection against water exposure, such as splashes or light moisture.
  • Typically designed to withstand damp environments but may not prevent water from entering if submerged or exposed to heavy water pressure.

• Watertight:

  • Completely sealed to prevent water from entering, even under pressure.
  • Can typically be submerged without water penetration, making it suitable for harsh or submerged environments.

In the case of the T775-SENS-WR and T775-SENS-WT sensors, the WR (Water-Resistant) version may be fine for damp conditions or occasional splashes, while the WT (Watertight) version is better suited for environments where full immersion or heavy water exposure is a concern.