Basics of Sight Glass Level Gauge
Level gauges are perhaps the simplest indicating instrument for liquid level in a vessel. They are often found in industrial level-measurement applications, even when another level-measuring instrument is present, to…
Basics of Suspended Particulate Matter (SPM) Analyzers
Suspended Particulate Matter (SPM) Suspended Particulate Matter (SPM) is solid and liquid particle suspended in ambient air of which particle size is not more than 10 micro-m. 1. Beta-ray Absorption…
Basics of Differential Pressure Transmitters
One of the most common, and most useful, pressure measuring instruments in industry is the differential pressure transmitter. This device senses the difference in pressure between two ports and outputs…
Pressure Transmitter Manifolds
Pressure Transmitter Manifolds An important accessory to the DP transmitter is the valve manifold. This device incorporates manual valves to isolate and equalize pressure from the process to the transmitter,…
Pressure Transmitter Vent fittings
Before removing a pressure transmitter from live service, the technician must “bleed” or “vent” accumulated fluid pressure to atmosphere in order to achieve a zero energy state prior to disconnecting…
Pressure Gauge Pulsation Damping
A simple way to mitigate the effects of pulsation on a pressure gauge is to fill the inside of the gauge with a viscous liquid such as glycerin or oil.…
Pressure Gauges : Remote and Chemical Seals
Pressure Gauges : Remote and Chemical Seals Isolating diaphragms have merit even in scenarios where pressure pulsations are not a problem. Consider the case of a food-processing system where we…
Pressure Transmitters Filled impulse lines
An alternate method for isolating a pressure-sensing instrument from direct contact with process fluid is to fill the impulse lines with a harmless fluid, which in turn directly contacts the…
Pressure Transmitters Purged impulse lines
Pressure Transmitters Purged impulse lines Another method for isolating a pressure instrument from direct contact with process fluid, particularly when the impulse line is prone to plugging, is purging the…
Pressure Transmitters Heat-traced impulse lines
If impulse lines are filled with liquid, there may exist a possibility for that liquid to freeze in cold weather conditions. This possibility depends, of course, on the type of…
