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Flow Switches and Relays

 

Check Proven reed switch & relay technology
Check Hermetically sealed for reliability
Check Available with or without enclosures
Check Safety rated (with enclosures)
Check Most switches are field adjustable

flow switches

Features

Orange Research flow 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 flow switches are hermetically sealed reed switches and come with or without enclosures, depending on the flow 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 flow 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 flow switch models allow for two relays on one instrument.

Many customers select a flow unit with a switch or a transmitter, which allows for remote readout and alerts.


Specifications

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

Note

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 Differential Pressure Switches & Relays!

Refer to our Instruction Sheets for schematics on our differential pressure and flow switches, relays and electronics.