Pressure Sensor (Tank / Pipe Monitoring)

The Tyre Pressure Analogy

When you check your vehicle's tyre pressure — you get a number. Not just "high" or "low" — an actual value in PSI or Bar. That exact value tells you whether to add air, release some, or leave it.

A pressure sensor in BMS works exactly this way — measuring the actual pressure at one point and sending a continuous reading to the controller.

Pressure Sensor Applications:

WATER TANK LEVEL MONITORING:
  Pressure sensor at tank bottom
  Water height creates pressure proportional to level
  More water = more pressure = higher level reading
  BMS knows tank level continuously without float switch
  Raises alarm when level is low or overflows
  Commands fill pump to start/stop
CHILLED WATER SYSTEM PRESSURE:
  Monitors system pressure continuously
  Low pressure = possible water leak or pump fault
  High pressure = possible blockage
  BMS alerts engineer before damage occurs
COMPRESSED AIR PRESSURE:
  Monitors compressed air supply to pneumatic actuators
  Low pressure = actuators will not operate correctly
  BMS alarm → engineer investigates compressor
HOT WATER SYSTEM PRESSURE:
  Boiler and heating system pressure monitoring
  Safety critical — overpressure in boiler = serious hazard

How Level Is Calculated from Pressure:

Water creates pressure based on height (head pressure):
1 metre of water height = approximately 9,800 Pa = 0.098 Bar

So if sensor reads 0.3 Bar:
  0.3 Bar ÷ 0.098 = approximately 3 metres of water above sensor
  If tank is 4 metres deep: level = 3/4 = 75% full
BMS converts pressure reading to % level automatically
Displays level, controls fill pump, sends alarms