In most applications or trouble shooting situations, one of the first questions to be addressed is the operating pressure on the device. Pressure gauges are the heart of any piping system and should be installed at key points to provide measurements as needed. Pressure gauges can also be marked with a magic marker to show the proper pressure range for an application. Using this method, a reading under or over normal is a sign of a problem to be investigated.

Pressure gauges come in many styles and shapes. Size and accuracy determine the cost of the gauge. For important applications, use either a +/- 1% or +/- 1/2% gauge for accurate readings. The accuracy percentage is based on the full scale range of the gauge. A gauge with a range of 300 psig and an accuracy of +/- 1% would be accurate to +/- 3 psig of the reading on the gauge. A 1/2% gauge would be accurate to +/- 1.5 psig of the reading. Small inexpensive 2" style gauges are +/- 2% or higher on accuracy. For important situations, they should not be used.

Gauges on steam service must always be installed on a pigtail siphon to keep high temperatures out of the gauge mechanism. Gauges which are subjected to vibration should be liquid filled. Gauges which are subjected to pressure surges should be installed with a snubber. Gauges installed on hazardous materials should be installed with a diaphragm seal.

The range of the gauge should be selected so that the expected reading is about 50-75% of the full scale range of the gauge. Gauge case sizes range from 1" to 8" in diameter. Case size is a function of the distance the operator will be from the gauge with larger case sizes being readable from longer distances.

We offer pressure gauges and accessories for just about any application. Call us for assistance and prices