Key Features and Components

1. Robust Construction & Corrosion Resistance:

◦ Materials: Made from marine-grade metals like 316 Stainless Steel, Brass, or Bronze. These are chosen for their excellent resistance to saltwater corrosion, rust, and general weathering.

◦ Finishes: Often have additional protective coatings like chrome plating or epoxy paint for extra durability.

2. The Metallic Protector (Thermowell):

◦ Primary Function: It acts as a permanent, sealed barrier between the thermometer and the process fluid.

◦ Protection:

Pressure: Withstands high pressure in pipes and tanks.

Abrasion: Protects the sensor from debris or slurry in the fluid.

Corrosion: Takes the brunt of the corrosive fluid, preserving the thermometer itself.

Contamination: Keeps the process fluid clean.

◦ Safety: Allows for removal or replacement of the thermometer without needing to shut down the system or drain the tank, which is crucial for continuous operations.

3. The Temperature Measurement Unit:

◦ Dial Type (Bimetallic): Most common. Uses a coiled bimetallic strip that expands/contracts with temperature, moving a needle on a dial. Known for reliability without needing a power source.

◦ Digital Type: Features a sensor (like a thermocouple) inside the well and displays the reading on an LCD screen. May require a battery.

4. Mounting Options:

◦ Threaded Connection (Most Common): Has a threaded stem (e.g., NPT - National Pipe Thread) that screws directly into a tapped port on a pipe, engine manifold, or tank.

◦ Flange Mount: For larger tanks or pipes, it bolts on with a flange.

5. Easy-to-Read Dial:

◦ The face is typically large, with clear numerals and units (both °C and °F are common).

◦ Often has a "safety" or "normal operating range" marked in green, with warning zones in red.