Pressure switches

Pressure Switches

pressure-switches

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PSM-520

The model PSM-520 pressure switch is an electro mechanical instrument that senses changes in pressure and provides electrical on-off contact at predetermined pressure values.

The PSM-520 may be used to energise an alarm or directly control the process by cycling pumps, shifting valves etc. In an alarm application, the switch supports valuable equipment by signalling an alarm. In direct control applications, the switch can be linked electrically to other equipment.

PSM-520 switches find applications in :
1. Automatic start/stop of pump
2. Water treatment filtration system
3. Chillers (water/air cooled)
4. Lubrication oil skids

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PSM-550

PSM-550 pressure switches utilise seamless bellows as the sensing element. Simplicity of design and easy of installation has been stressed for reliable use, even in applications where shock and vibrations are present. The sensing element is suitable for a variety of process fluids.

PSM-550 switches have an excellent record backed by our responsive manufacturing facility. Special application assistance is always available.

Applications include pumps, compressors, filters, evaporators, heat exchangers, lubrication systems, hydraulic systems, marine equipment, heating and air conditioning equipment, turbines, generators and circuit-breakers etc.

PSM-550 switches find applications in :
1. Pumps, filters
2. Vacuum brakes
3. Lubrication system, hydraulic system
4. HVAC
5. Circuit breakers
6. Heat exchanger, water treatment

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PSM-530

Model PSM-530 pressure switches are essentially designed for on?off pressure control applications such as air compressors or water pumps to control their working between the minimum and maximum setting values.

A diaphragm senses the change in pressure and actuates a triple pole contact switch, which enables control of 3-phase motors. The set point (cut-out pressure) and reset point (cut-in pressure) are adjusted by a range screw and a differential screw.

A pressure relief valve (unloader valve) to relieve the pressure locked at the compressor cylinder head is available in model PSM-530.

PSM-530 switches find applications in :
1. Automatic start/stop of compressors
2. Automatic start/stop of water pumpss

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900 Series

This compact version in Switzer series 900 Pressure Switches using components of high reliability is specifically designed for OEMs.

The sensing element is a hydraulically formed seamless Phosphor Bronze or Stainless Steel Bellows mounted external to the weatherproof switch housing.
1. Models 901, 902 & 903
2. Phosphor Bronze / 316 LSS Bellows
3. Range (–)1~0 to 15~75 bar
4. Max. Working Pr. Up to 80 bar
5. Repeatability 0.5% FSR(1.0% FSR for 281)
6. Fixed or adjustable On-Off differential
7. Independent High – Low set points ( Model 281 only)
8. Weatherproof and Flameproof Pr Die Cast Aluminium or weatherproof Investment Cast SS enclosure
9. Instrument quality snap acting SPCO micro switch.One or Two as required

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