Differential Pressure Switches And Relays
Available With or Without Enclosures
- Proven reed switch & relay technology
- Hermetically sealed for reliability
- Safety rated (with enclosures)
- Most switches are field adjustable
Features
Orange Research differential pressure instruments are available with switches and relays to allow the user to be alerted of process conditions, or control process equipment at pre-set values. We offer SPST, normally open or normally closed, and SPDT switches.
Our differential pressure switches are hermetically sealed reed switches and come with or without enclosures, depending on the differential pressure switch model. The models with enclosures have all of the common safety ratings to satisfy a variety of environments and markets. Select from Nema-4X to Class 1, Division 1 or 2, or UL, CSA, CE, or ATEX ratings, just to name a few. For complete safety ratings or certifications refer to our individual model Specifications Sheets.
Most of our reed switches are field adjustable within the upper 70 or 80% of the full-scale range of the instrument, depending on the model. Refer to our Specification Sheets for details on each model.
All differential pressure switches are preset to full-scale range unless another value is specified at the time of order placement. When two switches are used they can be set independent of each other.
Our relays are best for high inductive circuits such as those incorporating solenoids or motors. We use a reed switch to actuate the relay at a prescribed value. This isolates the reed switch, protecting if from high current or voltages. Some differential pressure switch models allow for two relays on one instrument.
Many customers select a differential pressure unit with a switch or a transmitter, which allows for remote readout and alerts.
| Code | Number of Switches* | Elements | Switch Ratings (for DC ratings see individual specification sheets) | Availability |
|---|---|---|---|---|
| - A - A-A | 1 2 | SPST SPST | N.O., 125 VAC, 0.7 A N.O., 125 VAC, 0.7 A | All models All but 1201PS, PGS, 1502DS, DGS |
| - B - B-B | 1 2 | SPST SPST | N.C., 120 VAC, 0.2 A N.C., 120 VAC, 0.2 A | All models All but 1201PS, PGS, 1502DS, DGS |
| - C - C-C | 1 2 | SPDT SPDT | C form, 120 VAC, 0.2 A C form, 120 VAC, 0.2 A | All models All but 1201PS, PGS, 1502DS, DGS |
| - R2 | Relay | DPDT | 10 A contacts, 115 VAC coil (standard) | All but 1201PS, PGS, 1502DS, DGS 1831DS, DGS |
Orange Research instruments use long life, hermetically sealed reed switches. Depending on the load, reed switches can be expected to provide between 1-5 million operations at 240 VAC/50 W and 5-10 million operations at 110 VAC/50 W.
To provide maximum life it is recommended that the proper contact protection be applied to reduce or eliminate arcing when switching inductive loads. For example, AC circuits could use a 100 ohm 1/4 W resistor and 0.1 μf, 600 V capacitor in series across the contacts. For DC circuits use a 1N4004 diode (or equivalent) that is connected cathode-to-positive across the inductive load.
Ask about our Flow Switches & Relays!
Refer to our Instruction Sheets for schematics on our differential pressure and flow switches, relays and electronics.
Photos: DP Switches & Relays
DP Switch Family
DP Switches Piston
DP Switches Diaphragm
WARNING: Some of our products contain Nickel, a chemical known to the State of California to cause cancer. For more information go to: