PRESSURE SWITCHES (PS) & DIFFERENTIAL PRESSURE SWITCHES (DPS) TECHNICAL REQUIREMENTS

This article is about general and technical requirements for Pressure and Differential Pressure Switches used in Integrated Automation System or Building Automation System.

PRESSURE SWITCHES (PS) & DIFFERENTIAL PRESSURE SWITCHES (DPS) TECHNICAL REQUIREMENTS

• DIFFERENTIAL PRESSURE SWITCHES (DPS) <Modify as required to match project design>
  1. All pressure sensing elements shall be corrosion resistant. Pressure sensing elements shall be bourdon tubes, bellows, or diaphragm type. Units shall have tamper-proof adjustable range and differential pressure settings.
  2. Pressure sensor switch contacts shall be snap action micro-switch type. Sensor assembly shall operate automatically and reset automatically when conditions return to normal. Complete sensor assembly shall be protected against vibration at all critical movement pivots, slides and so forth.
  3. Differential pressure switches shall be vented to withstand a 50% increase in working pressure without loss of calibration.
  4. General Service Auto Reset – Air: Diaphragm with adjustable setpoint and differential and snap acting form C contacts rated for the application. Provide manufacturer’s recommended static pressure sensing tips and connecting tubing. <Acceptable Manufacturer – Dwyer Series 1900 or approved equal.>
  5. General Service Manual Reset – Air: Diaphragm with adjustable setpoint and differential and snap acting form C contacts rated for the application. Provide manufacturer’s recommended static pressure sensing tips and connecting tubing.  <Acceptable Manufacturer – Dwyer Series 1900 or approved equal.>
  6. General Service – Water: Diaphragm with adjustable setpoint, 2 psig or adjustable differential and snap-acting Form C contacts rated for the application. 60 psid minimum pressure differential range and 0 degrees F to 160 degrees F operating temperature range.
• PRESSURE SWITCHES (PS) <Modify as required to match project design>
  1. Diaphragm or bourdon tube with adjustable setpoint and differential and snap-acting Form C contacts rated for the application. Pressure switches shall be capable of withstanding 150 percent of rated pressure.
  2. Acceptable Manufacturers: <Confirm list>
     1. Honeywell
     2. ITT Neo-Dyn
     3. ASCO, Penn
     4. Square D
     5. Johnson Controls
     6. Approved equal