Pressure gauges and switches are among the most often used instruments in a plant. But because of their great numbers, attention to maintenance--and reliability--can be compromised. As a consequence, it is not uncommon in older plants to see many gauges and switches out of service.
In brief, it is very common for pressure gauges to ignore atmospheric pressure—that is, to read zero at atmospheric pressure. We therefore define gauge pressure to be the pressure relative to atmospheric pressure. Gauge pressure is positive for pressures above atmospheric pressure, and negative for pressures below it.
Description: Device for absolute pressure and gauge pressure measurement in gases, steams or liquids Large selection of process connections: universal use Temperature range up to 130 °C (266 °F) Pressure range up to 400 bar (6000 psi) Easy commissioning without the need for an
On most digital gauges, you'll see a flashing pressure reading, if there's a low (or high) pressure warning. If your boiler pressure reads less than 1 bar, it's possible that you might have lost water from the system, which needs to be replaced.
A siphon is connected between the boiler and the steam pressure gauge to prevent water from entering the Bourdon tube. False A slow gauge reads less pressure than is actually in the boiler.
Pressure and Temperature gauge on hot water or hydronic heating boilers: this gauge displays the heating boiler internal pressure and temperature. Typical pressure for a residential boiler serving a two story home would show 12 psi cold, and less than 30 psi hot.
Boiler gauges measure both the temperature and water pressure in boilers. Dial pressure and vacuum gauges include compound, pressure, and vacuum gauges. These industrial gauges are designed for use with air and noncorrosive fluids such as water and oil in pumps, filters, compressors, and regulators.
Square Boiler Gauges, MNPT, 1/2" display both the temperature and pressure of the water in a boiler. They measure water pressure in psi and kPa and temperature in °F and °C. Each features steel gauge case material for durability and brass/bronze wetted parts for corrosion resistance. Pressure accuracy: ±3-2-3% Temp. accuracy: ±3%.