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Delta-Pro™ 24 Series

Pressure and Differential Pressure Switch



The cost-effective 24 Series Delta-Pro™ pressure, vacuum, and differential pressure switches offer a unique blend of compact size, excellent performance, and environmental protection. Available with brass or polysulfone pressure connections the

Delta-Pro is ideal for applications involving hot or cool air, water, gas or oil.






Product Overview




Corrosion resistant molded NEMA 4 enclosure

Brass, Teflon® or polysulfone wetted parts

Terminal block wiring

Our lowest cost differential pressure switch

Adjustable ranges:

     ◦ 30 "Hg Vac to 90 psi

       1 bar Vac to 6,2 bar

     ◦1 to 45 psid

       70 mbar d to 3 bar d   Approvals: UL, CSA, CE

JIT Delivery








The precision snap-acting switch and sensitive diaphragms combine to provide a narrow deadband and repeatability of

approximately ±1% of full scale range. A convenient, externally accessible adjustment screw is multi-turn to provide easy set point adjustability. The force-balanced design gives the Delta-Pro excellent vibration resistance.



  UL listed and cUL certified. CE compliant to low voltage directive

   and pressure equipment directive

  Vacuum, Pressure or Differential pressure measurement

  Compact Size

  Brass & Polysulfone (FDA compliant) Pressure Connections

  5A @ 125/250 VAC SPDT snap-acting switch

  External stainless steel multi-turn adjusting screw

  OEM capabilities include external adjustment knob with or without

    reference scale

  Complies with Enclosure Type 4 with watertight conduit fitting

  Terminal block wiring

  Optional red status light

  Adjustable Ranges:

    Pressure: 30" Hg Vac to 90 psi

    (-1 to 6,2 bar)


    Differential Pressure: 1 to 45 psid

   (68,9 mbar to 3,1 bar)











Storage Temperature                -20° to 180°F (-29° to 82°C)


Ambient Temperature               30° to 160°F (-1° to 71°C). Set point typically shifts less than ±0.6% of range for a

      Limits                                      50°F (28°C) ambient temperature change; consult factory for special ratings


Max Media Temperature           200°F (93°C) at 100 psi working pressure  


Shock                                         Set point repeats after 15G, 10 millisecond duration


Vibration                                    Set point repeats after 2.5G, 5-500 Hz


Enclosure Classification          Complies with enclosure type 4 requirements with optional water tight conduit connector.

                                                       Reinforced polyester body, stainless steel cover with gasket.


Set point                                    Typically ± 1% of full scale range.



Switch output                           One SPDT precision snap-acting micro-switch with mechanical contact life of 10 million

                                                      cycles. Actual life depends on electrical load and cycle frequency


Electrical rating                       Rated to 5 A resistive and 5 A inductive (75% PF) at 125 VAC and 250 VAC, 1/4 HP; 5 A

                                                     resistive and 3 A inductive at 30 VDC and 0.5 A resistive and 0.25 inductive at 125 VDC.

                                                     Gold flash over silver contacts for minimum loads of 5 mA at 6 VDC, 2 mA at 12 VDC and

                                                     1 mA at 24 VDC



Weight                                      6.5 oz.


Electrical  Connection            7/8" hole for optional 1/2" NPT conduit connector. Terminal block with screw terminals.

                                                     Max wire size 16 AWG



Pressure Connection              Models 013-014, 019-022: 1/4" NPT (female) brass; models 011-012, 015-018: 1/4" NPS

                                                    (female) FDA compliant* Udel® polysulfone, non-tapered to minimize connection stress

                                                     with 1/4" NPT (male) fittings - max torque is 2-ft.lbs.



Temperature Assembly          Bulb and capillary: 6 feet; 304 stainless steel Immersion stem: nickel-plated brass

                                                    (standard); optional 316L stainless steel


Fill                                             Non-toxic oil filled


Temperature Deadband         Typically 4% of range under laboratory conditions (70°F ambient circulating bath at rate

                                                     of 1/2°F per minute change)


Mounting & Installation          Surface mount with two screws through clearance holes, or mount by pressure







Tel:  (617) 926-1000

Fax: (617) 926-4354

Do you have a  customer service or technical question?  Please email us and we will get back to you.

180 Dexter Avenue, Watertown, MA  02472-4200