The Barksdale D1T-A80SS is a single-setting, adjustable, NEMA 4X (IP65) sealed, single-pole double-throw (SPDT) pressure switch. It is built for precise control or alarm functions in systems using air, oil, water, and other compatible media.
Key Features & Specifications
1. Model Number Decoding (D1T-A80SS):
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D1T: Series identifier for a general-purpose, adjustable pressure switch with a SPDT snap-action switch and a NEMA 4X housing.
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A80: Indicates the pressure range: 0.5 to 80 PSI (0.034 to 5.52 bar). This is a relatively low to medium pressure range.
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SS: Denotes the wetted parts material.
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First S = 316 Stainless Steel pressure cavity (diaphragm and housing).
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Second S = 316 Stainless Steel pressure port (¼” NPT male).
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2. Primary Specifications:
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Electrical Rating:
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Switch Element: SPDT (Form C) – One common (C), one normally open (NO), one normally closed (NC) contact.
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Maximum Switching Capacity: Typically 15A @ 125/250VAC or 0.5A @ 125VDC. (Always confirm with the latest datasheet).
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Electrical Connection: Conduit entry with a removable gland plate. Terminals are screw-type.
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Pressure Specifications:
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Adjustable Range: 0.5 to 80 PSI (0.034 to 5.52 bar).
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Proof Pressure: Typically 2x the maximum range (160 PSI for this model).
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Burst Pressure: Significantly higher than proof pressure.
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Set Point Accuracy: Usually within ±1% of full scale, depending on calibration.
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Deadband (Differential): Factory-set and non-adjustable on the standard model. Typical deadband is a percentage of the set point (e.g., 10-20%).
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Environmental & Construction:
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Housing: Robust, NEMA 4X (IP65) rated. Provides protection against water, dust, hose-directed water, and corrosion.
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Wetted Parts: All 316 Stainless Steel (diaphragm, cavity, port) for excellent corrosion resistance with a wide variety of media, including water, oils, inert gases, and mild chemicals.
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Operating Temperature: Standard models are typically rated for -20°F to 165°F (-29°C to 74°C) for the housing and switch. The diaphragm can handle higher fluid temps (e.g., up to 200°F/93°C).
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Pressure Connection: ¼” NPT Male.
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3. Function & Operation:
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Single-Setting: One adjustment screw for setting the trip point (cut-in or cut-out pressure).
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SPDT Switching: Provides maximum wiring flexibility. Can be used to:
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Break a circuit on rising pressure (using NC contact).
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Make a circuit on rising pressure (using NO contact).
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Control two separate circuits simultaneously (e.g., one alarm, one control).
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Mechanical, Diaphragm-Actuated: Pressure acts on the stainless steel diaphragm, which mechanically moves the snap-action switch. Known for reliability and resistance to shock/vibration.
Typical Applications
This switch is ideal for OEM and MRO applications requiring a durable, sealed switch in its pressure range, such as:
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Industrial compressor control and alarms.
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Pump control (on/off or alarm for low pressure or loss of prime).
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Hydraulic system pressure monitoring.
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Filter clog indicators (differential pressure).
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Cooling water flow/pressure monitoring.
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General machinery and process control.
