Schneider Electric (Barber Colman) 2252-655 Temperature Transmitter

The Schneider Electric (Barber Colman) 2252-655 Temperature Transmitter is a precision pneumatic temperature transmitter engineered for high-accuracy sensing in duct or outdoor air applications. This one-pipe device utilizes a liquid-filled copper sensing element and a remote bulb with a 9-foot capillary to provide reliable direct action proportional signals. With a temperature range of -25 to 125°F and a fixed 150-degree span, it integrates seamlessly into pneumatic control systems for HVAC automation.

Built for the rigors of mechanical rooms, the 2252-655 features a beryllium copper feedback bellows to ensure exceptional linearity and response stability. The transmitter operates on a supply air pressure of 20 psig, delivering a standard 3 to 15 psig pneumatic output to receiver-controllers or gauges. The robust 1/4" x 10 1/2" remote bulb is silver-soldered for durability, and the unit includes a field-accessible zero adjustment for fine-tuning calibration post-installation.

• Remote Bulb Flexibility: The 9-foot capillary allows for versatile sensor placement while keeping the transmitter head accessible.
• Rugged Construction: Features a cast aluminum base and zinc-plated steel cover to withstand outdoor air mounting environments.
• High Thermal Limits: Capable of handling a maximum temperature of thermal element up to 241°F without damaging the sensing element.
• Precise Control: Internal pneumatic feedback maintains accuracy across the entire 150-degree temperature span.
• Easy Integration: Standard 1/8" FNPT air connection and surface mounting design simplify contractor installation.

Common Questions:

How do I calibrate the zero point on this transmitter?
The 2252-655 includes an accessible zero adjustment screw under the cover to align output pressure with measured temperature.

Can this transmitter be used in immersion applications?
Yes, when paired with a compatible immersion well, the remote bulb model is suitable for measuring fluid temperatures in pipes or tanks.

What is the required air supply for proper operation?
The device requires 20 psig of clean, dry air supplied through a 1.0 scfh restrictor to maintain a stable 3 to 15 psig signal.

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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.