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● BELLOWS ACTUATED ● PROVEN RUGGED MECHANISM ● RELIABLE PERFORMANCE IPS – PRESSURE SWITCHES Operating Function Industrial Pressure Switch (IPS) is an electromechanical device that senses changes in pressure and provides electrical contact closures at predetermined pressure values. IPS Pressure Switch may be used to energize an alarm or may directly control the process by cycling pumps, shifting valves etc. In an alarm application, the switch protects valuable equipment by signaling an alarm. In direct control application, the switch can be linked electrically to other equipment. Applications IPS Pressure Switches are meant for use with oil, water, air, steam and other non corrosive pressure mediums. They are not designed for use with any refrigerant gases. IPS Pressure Switches are used on a wide variety of applications which include pumps, compressors, turbines, lubrication systems & condensers to name a few. Setting The adjustment knobs are conveniently located on top surface of the control. The switch can be set to operate at desired pressure values by adopting following procedure : 1. Decide the maximum pressure at which the switch has to changeover. 2. Decide the differential at which the control has to operate. 3. First set the maximum changeover pressure on the range scale. This can be done by removing the knob and turning the range spindle. 4. Next set the differential on the differential scale with the help of the differential spindle. 5. Check the maximum and minimum changeover pressures with a master gauge. Electrical Connection On the inside of the front cover, a diagram as shown under is stamped. PRESSURE / DIFFERENTIAL PRESSURE SWITCHES TYPE IPS / IPSD GENERAL SPECIFICATION Enclosure Painted Mild Steel to IP:33 as per IS:13947 (Part-1), 1993 Sensing Element Phosphor Bronze Bellows Switching 1 SPDT Contact System Switch Rating 6A Inductive / 10A Resistive 380V AC, 0.2A Inductive 250V DC Repeatability / Accuracy ± 2% FSR Ambient Temperature 70°C Process Temperature 100°C max. Process Connection 1/4" BSP (F) Cable Entry Suitable for 6 to 14 mm dia Cable Mounting Surface / Panel Type Code No. Range Differential Max. Pressure atm PSI atm PSI atm PSI IPS–70 020D8275 0 – 5 0 – 70 0.4 – 4 6 – 55 16 230 IPS–100 020D8276 0 – 7 0 – 100 0.6 – 6 9 – 85 16 230 IPS–200 020D8277 6 – 15 85 – 215 1.4 – 5 20 – 70 32 450 IPS–400 020D8278 6 – 30 85 – 425 3 – 8 45 – 115 32 450 Terminal designations 1, 2 & 3 are engraved on the transparent cover of the electrical contact system. The electrical circuit is maintained between contacts 2–1 under normal conditions. The contacts change over to 2–3 on rise of pressure to preset value. CHANGEOVER FROM 2–1 TO 2–3 ON RISE IN PRESSURE 2 1 3 Since the electrical contact is of SPDT type, it can be used for reverse applications also. Mounting The pressure control can be mounted on a wall or panel by means of mounting holes provided at the back of the device. Operating Function Industrial Differential Pressure Switch (IPSD–50) is an electromechanical device that senses changes in pressure difference between two pressure lines and provides electrical contact closures at predetermined values. Applications These switches are normally used on pressure lubricated system across the filter to get an indication or alarm when the filter gets choked. It can also be used to stop the pump or energise / de-energise another electric circuit depending upon the actual application. It is designed for use with oil, air, water and low temperature steam. It is not designed for refrigerant gases. Setting The lower changeover is set on the scale by rotating the pressure setting disc inside the control. Clockwise rotation of the setting disc reduces the set differential pressure and vice versa. The higher changeover is achieved by adding the contact differential (2.8 PSI fixed) to the lower changeover. The setting disc is visible after removing front cover. It is placed just below the LP bellows between the LP bellows and main spring. Fitting IPSD Differential Pressure Switch can be fitted in any position. It can be mounted directly or on panel by means of mounting holes in the back of the device. The upper bellows is the low pressure element and must be connected to lower pressure circuit. The lower bellows is the high pressure element and must be connected to higher pressure circuit. Functioning example IPSD Differential Pressure Switch can be used, to monitor choking of filters in a lubrication system. High pressure bellows can be connected to the inlet of the filter and LP side bellows to the outlet of the filter. The differential can be set at desired differential pressure which is adjustable between 4.3 to 64 PSI. As soon as the pressure difference between the inlet and the outlet increases above the set difference of pressure by 2.8 PSI, the switch will operate and changeover will take place to give a signal. It will changeover again when the difference of pressure falls to the set difference of pressure to stop the signal. IPSD – 50 DIFFERENTIAL PRESSURE SWITCHES GENERAL SPECIFICATION Enclosure Painted Mild Steel to IP:33 as per IS:13947 (Part-1), 1993 Range 4.3 to 64 PSI (0.3 to 4.5 atm) Differential 2.8 PSI (0.2 atm), Fixed Maximum Pressure 313 PSI (22 atm) Sensing Element Stainless Steel Bellows Switching 1 SPDT Microswitch Switch Rating 5A, 125/250V AC, 0.2A 250V DC Repeatability / Accuracy ± 2% FSR Ambient Temperature 70°C Process Temperature 100°C max. Process Connection 3/8" BSP (M) Cable Entry Suitable for 6 to 14 mm dia Cable Mounting Surface / Panel Code No. 060D9002 MOUNTING DIMENSIONS IPS IPSD–50 All dimensions are in mm 127 75 50 50 105 105 75 190 57 27 This is not a contractual document. Prior notification of changes in specifications is impracticable due to continuous improvement FOR SWITZER'S OFFICES IN INDIA CHECK AT: http://switzerprocess.co.in/index.php?route=information/information&information_id=9 #0715 IPS/IPSD– Rev.1