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…
Inferential Measurement based on Pressure
A very common technique in industrial instrumentation is to calculate the value of a process variable from the values of related variables which are easier to measure (Note 1 )…
DP Transmitter Applications
The combination of two differential pressure ports makes the DP transmitter very versatile as a pressure-measuring device. This one instrument may be used to measure pressure differences, positive (gauge) pressures,…
Pressure Gauge Water Traps and Pigtail Siphons
Many industrial processes utilize high-pressure steam for direct heating, performing mechanical work, combustion control, and as a chemical reactant. Measuring the pressure of steam is important both for its end-point…
Pressure Transmitter Heated Enclosures
In installations where the ambient temperature may become very cold, a protective measure against fluid freezing inside a pressure transmitter is to house the transmitter in an insulated, heated enclosure.…
Field Instruments Mounting brackets
An accessory specifically designed for a variety of field-mounted instruments including DP transmitters is the 2 inch pipe mounting bracket. Such a bracket is manufactured from heavy gauge sheet metal…
Strain Gauge Working Principle
Strain Gauge Sensors or Piezoresistive sensors Piezoresistive means “pressure-sensitive resistance,” or a resistance that changes value with applied pressure. The strain gauge is a classic example of a piezoresistive element,…
Differential Pressure Transmitter Working Principle
Another common electrical pressure sensor design works on the principle of differential capacitance. In this design, the sensing element is a taut metal diaphragm located equidistant between two stationary metal…
Pneumatic Pressure Transmitters Principle
Force Balance Pressure Transmitters or Pneumatic Pressure Transmitters First we have to know that the Force Balance Pressure Transmitters are very old concept which uses pneumatic (air) signals for transmitters operation.…
