Absolute pressure transmitter

The FKA high accuracy absolute pressure transmitter model and FKH high accuracy absolute pressure transmitter model accurately measure an absolute pressure and transmits a proportional 4-20 mA output signal.
The transmitter uses a unique high reliability micro-capacitive silicon sensor in combination with a state-of-the-art digital signal processing to provide exceptional performances in terms of accuracy and stability.

• Accurate measuring results independent of atmospheric conditions
• Significant process performance thank to 4D Gyration^TM characterization
• High plant availability thanks to high reliability unique design

Absolute pressure transmitters measure the process pressure relative to atmospheric air, other gases, steams and liquids from the absolute zero reference point, i.e., perfect vacuum.
Any pressure transmitter takes measurements against a reference pressure. In case of absolute sensors, they work using perfect vacuum pressure (absolute zero) as the reference.

A full vacuum has an absolute pressure reading of 0 bar and average barometric pressure at sea level is 1013,25 mbar.
In contrast, the transmitters that quantify the difference between the process pressures against barometric pressure are called gauge pressure transmitters. Differential pressure transmitters, on the other hand, measures two opposing pressures.

These pressure transmitters are generally more expensive than gauge pressure transmitters.
Another disadvantage of this type of sensor is that its maximum pressure capacity is much lower than that of digital gauge pressure transmitters. They require special tools to be calibrated and can often take longer.

You can ask our instrument calibration service team to help you with this task.

In general, they are capable of measuring the pressure of any gas or fluid under pressure.
These pressure transmitters are used in the chemical and petrochemical industries, the food industry, the metallurgical industry, the oil and gas industry , and in research laboratories and institutes.
For these industrial applications, it is imperative that the measurements are accurate and to use a fixed vacuum pressure (absolute zero) as the reference.

Your processes are thus free of atmospheric pressure fluctuations.
An absolute pressure sensor is the only device that can measure atmospheric pressure, so it may be utilized to assess barometric pressure.
The calculation of altitude based on the variation in atmospheric pressure when the elevation changes is another example of how this may be utilized.

• measuring the level of low-lying storage tanks
• monitoring of gas pipeline pressure measurement
• barometric pressure measurement

Changes in temperature, pressure, and humidity all affect the barometric pressure.

The atmosphere's pressure can fluctuate by about 30 mbar due to weather changes, and by about 200 mbar if the sensor's elevation changes.
As a result, for the same measured pressure, a digital pressure gauge may provide a measurement error owing to atmospheric pressure variations.
When measuring low pressures, this error could be significant.
In such a case, the use of an absolute pressure sensor is recommended.