D1T, D2T Series

  • High reliability
  • High accuracy
  • NEMA 4
  • Ideal for pressure and vacuum applications
  • Single and dual switching capability
  • Tamper-proof external adjustment
  • Diaphragm Seal Option Available

Barksdale's D1T & D2T Terminal Block Diaphragm Pressure Switches offer superior accuracy in a robust package, making them the ideal solution to your industrial pressure control needs. These switches are ideal for applications requiring water-tight, NEMA 4 housings a covered terminal strip and tamper-proof external adjustment. (Factory set models are also available.) With pressure ranges up to 150 psi, these housed diaphragm pressure switches are suitable for use in either positive pressure or vacuum applications. Single- and dual-circuit models are available. Housed models feature a durable, anodized aluminum enclosure. For applications requiring a highly accurate switch in a durable package, Barksdale's D1T & D2T Terminal Block Diaphragm Pressure Switches are the ideal choice.


General Specifications*

Accuracy: ±0.5% of the adjustable range
Single pole double throw (SPDT) Snap Action; single circuit
10 amps @ 125/250 VAC; 3 amps @ 480 VAC (Class A or H limit switch). Consult sales drawing for ratings of optional limit switches.
Wetted Parts:
Process Fitting:
304 stainless steel, viton seals
17-7 PH stainless steel
Anodized aluminum
Electrical Connection: Terminal block through 1/2″ NPT conduit connector
Enclosure Rating: NEMA 4
Pressure Connection: 1/4″ NPT Female
UL (Optional):

CSA (Optional):

D1T models may be ordered as UL listed on request. D2T models may be ordered as UL Recognized components on request. File No. E42816

All models may be ordered as CSA listed under Class 3231 02, File LR22355 on request.

Temperature Range:


-40° to +165°F (-40° to +74°C)
Hermetic Div. 2 models:
-4° to +140°F (-20° to +60 °C)

-65° to +200°F (-54° to +93°C)

Adjustment Instructions:
Turn adjustment screw counterclockwise to raise actuation point.
Turn adjustment screw clockwise to increase setpoint (higher vacuum).
Options: – NEMA 4X enclosure
– Cleaned for oxygen service
– Factory pre-set
– Six-pin terminal block
Shipping Weight: 2.0 lbs. approximate
* See product confi gurator for additional options.

Wiring Code

Lead Circuit #1 Circuit #2
Pressure Vacuum Pressure Vacuum
Normally Closed Blue Red Orange Yellow
Common Purple Purple Brown Brown
Normally Open Red Blue Yellow Orange


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