Dwyer Instruments DAF-81-153-9K Pressure Switch

The Dwyer Instruments DAF-81-153-9K is a field-proven Bourdon tube pressure switch designed for contractors requiring high-sensitivity and repeatable setpoint control in demanding HVACR and industrial process environments. Constructed with a 316 stainless steel tube material and a rugged steel pressure connection, this unit provides superior chemical compatibility for both gases and liquids. It features a broad 10 to 300 psig range and utilizes an SPDT snap action switch (9-64 circuit) for reliable electrical changeover in automation logic. The vertical mount configuration and standard housing with a bottom connection simplify integration into existing manifolds or piping runs.

Engineered for technical precision, the DAF-81-153-9K includes a visible calibrated dial, allowing for rapid setpoint verification without de-energizing the system or opening the enclosure. This model is often specified for applications involving high-pressure steam, hydraulic systems, or corrosive media where FM approved pressure switches are required for safety compliance. The fixed deadband and external adjustment thumbscrews ensure that once your trip point is calibrated, it remains stable despite system vibrations or temperature fluctuations. For technicians managing boiler controls or pump sequencing, this industrial pressure switch delivers the reliability needed to prevent equipment cycling and mechanical fatigue.

• Corrosion Resistance: The 316 stainless steel Bourdon tube handles aggressive media that would degrade standard brass components.
• Enhanced Safety: FM approval makes this switch suitable for regulated safety-critical burner and furnace applications.
• Simplified Calibration: External adjustments and a clear scale mean no more guessing setpoints during commissioning.
• Robust Electrical Output: The SPDT contact arrangement supports both normally open and normally closed logic for versatile wiring.

Is the DAF-81-153-9K suitable for steam applications?
Yes, the 316 SS construction is ideal for steam, though we recommend using a siphon to protect the internal mechanism from extreme temperature spikes.

What is the maximum pressure limit for this model?
While the adjustable range is 10 to 300 psig, the burst and surge pressure limits typically correspond to the maximum scale rating; always verify your system’s peak surge before installation.

Can I mount this switch horizontally?
This model is specifically designed for vertical mount. Deviating from the intended orientation can affect the accuracy of the Bourdon tube and the calibrated dial readings.

This item is not eligible for free shipping.

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.