Kodiak Controls 4201-3.25-2-70 Probe

The Kodiak Controls 4201-3.25-2-70 Probe is a heavy-duty boiler tridicator designed for simultaneous monitoring of system pressure and temperature within a single 3.25-inch dial interface. This hydronic heating gauge features a 1/2-inch NPT lower mount connection and a 2-inch probe, providing precise readings for residential and commercial heating systems. Engineered with a robust steel case and a copper alloy wetted interior, it handles a dual-scale pressure range of 0-75 PSI (also measured in feet of H2O) and a temperature spectrum of 70-320°F (20-160°C).

For veteran technicians, the 4201 series tridicator is a standard-issue replacement part for aging HVAC pressure temperature gauges. Its bimetal sensing element and bronze Bourdon tube ensure high 3-2-3% accuracy, critical for maintaining optimal boiler head pressure and water temperature. Whether you are performing a routine boiler service or a full system installation, this mechanical tridicator offers the durability needed for high-demand environments without the complexity of digital sensors.

• Dual-Function Monitoring: Saves space and installation time by combining a 70-320°F thermometer and a 0-75 PSI pressure gauge into one unit.
• Industrial Build Quality: Features a black finished steel case and a synthetic window for protection against high-heat boiler room conditions.
• Standardized Fit: The 1/2" NPT bottom connection and 2" stem length ensure compatibility with most standard boiler tapping points.
• High-Visibility Dial: The large 3.25-inch face uses red and blue color-coded scales for rapid diagnostic checks of system vitals.

What is the thread size and mounting orientation for this probe?
This model features a 1/2" NPT lower mount, meaning the connection threads are located at the bottom of the dial for vertical installation on horizontal piping or boiler jackets.

Can this tridicator be used on potable water systems?
This unit is specifically designed for hydronic heating and boiler applications. For potable water, check local codes regarding lead-free requirements for wetted copper alloy components.

Is the 2-inch probe length fixed?
Yes, the 2-inch probe (stem) is the standard depth for this specific SKU (4201-3.25-2-70). Ensure your immersion well or tapping allows for this depth to get an accurate temperature reading.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.