Indicating Differential Pressure Switch



GENERAL has been designing and manufacturing high quality Bellow / Diaphragm Type Differential Pressure indicating switches to suit to most of the industrial application for accurate control of the process equipments. Rigorous and continuous tests are conducted for design and quality conformance.

  • Indicating Differential Pumps, Compressors, Lubrication Systems, Turbines, Generators, Boilers, Furnances etc. in industries such as Chemical, Fertiliser, Ferrous & Non-ferrous metal, Pulp & Paper, Power, Waste Water Treatment, Refinery & Petrochemical, Synthetic Fibre, etc. Pressure Switches are designed to use.

  • Specifications
  • How to Order
  • Enquiry
  • Download Pdf

Dial 100/ 150 mm (for diaphragm) & 150mm (for Bellow),
Aluminium dial, white background, black markings
Case SS304 / SS316 with bayonet bezel (for WP enclosure -
NAMUR & Micro switch / FP enclosure - NAMUR switch only)
Die Cast Aluminium (for Micro switch with FP enclosure only)
Protection Weatherproof to IP - 68 (IS:13947 part I / IEC:60529) Flameproof to IIA, IIB (equivalent to NEC Cl. 1, Div. 2, Gr. C & D)
Window Safety glass
Cable Entry ½" NPT (F)
Switch 1 SPDT / 2 SPDT, Snap acting micro-switch
Rated 5A @ 230 VAC / 3A @ 28 VDC
Inductive Contacts (NAMUR), Single or Double,
adjustable between 10% & 90% of the Range,
Nominal Voltage, 8.32 V DC, Operating Voltage, 5 to 25 V DC
Sensing element Bellow / Diaphragm
Sensor Material & Wetted Parts SS316 / SS316L / Monel / Hastelloy-C
Movement Brass / SS304 / SS316
Set Point Adjustable throughout the range
Mounting Surface Mounting / 2" Pipe Mounting
Process Connection 1/2" NPT (M) as standard. Other connections optionally
Range Minimum 0 to 250 mm WC(DP) for NAMUR switch in Diaphragm type
Minimum 0 to 2500 mm WC(DP) for NAMUR switch in Bellow type
Minimum 0 to 1kg/cm2(DP) for Micro switch in Bellow type
Higher ranges as per customer requirement
Accuracy Bellow type with Micro switch: ±1% FSD (for indication)  
& ±2% FSD (for Switching)
Bellow type with NAMUR switch: ±1% FSD (indication & switching)
Diaphragm type with NAMUR switch: ±1.6% FSD (indication & switching)
Temperature Suitablity
Ambient (-)20°C to 60°C, Media 100°C

Temperature Effect Within ±0.5% FSD/10°C, when temperature changes from    
reference temperature of 20°C

Blow out disc   
Provided at top of the Case
 (not applicable for FP Die Cast Aluminium Case)

Optional Diaphragm seal with Capillary