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How to calibrate a dp pressure transmitter


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How to calibrate a dp pressure transmitter

  1. 1. How to Calibrate a DP Pressure TransmitterGenerally, pressure transmitters are used to calculate pressure of liquids or gases. Such pressure isthe power thats needed is to stop either a gas or liquid from increasing. Generally referred to aspressure sensors, the gadgets generate electric functional signals that indicate the level of pressureimposed.Pressure transmitters are broadly used in various applications for controlling and monitoringpressure. They are typically used to evaluate water levels, altitude, gas/liquid flow and speedamongst other crucial pressure measurements. Although, not all the pressure transmitters are thesame. They differ in design, technology and even performance. This means that various pressuretransmitters are simply made for specific applications. Followed below are some of the differenttypes of pressure transmitters available: * Absolute transmitter - This type id made to measure force relative to perfect vacuum conditions.
  2. 2. * Gauge transmitter - This is one of the most common types of pressure transmitters available. Agood example is the tire pressure gauge. A gauge pressure transmitter is used to check pressurerelative to atmospheric pressure.* Vacuum transmitter - This type of pressure transmitter can be used to calculate pressure underatmospheric pressure and even absolute pressure.* Sealed transmitter - Although this type is just like gauge transmitter, it is basically suitable forcalculating pressure relative to fixed pressure.
  3. 3. * Differential transmitter - This type is used to measure the difference between 2 pressures.Of all the above types, its the differential pressure transmitter which differs considerably from theothers. It should however be noted that the above mentioned are not the basically types of pressuretransmitters available. There are other types whose difference usually is in the technology used.The DP pressure transmitterIt is a kind of pressure transmitter which is made to measure pressure in two differentenvironments. It is the transmitter of choice when it comes to measuring pressure drops in air filters,fluid levels and moreover changes in pressure when a liquid or gas flows. To provide correctpressure readings, calibration of a DP pressure transmitter is really crucial. The calibration process ishowever simple and straight forward.The initial step towards calibrating a DP pressure transmitter starts with filling 2 columns of thetransmitter with a liquid. The two columns are then connected and generally have a leveltransmitter on the column. The calibration method involves calibrating the level transmitters, settingone column at zero level and the other at 100 %. Whereas setting one column at zero means settingthe amount of the liquid to be even with that of the transmitter, setting the other column at 100 % isarbitrary because transmitter measures force change in relation to the other column.Besides the above mentioned procedure over, calibration of a DP pressure transmitter is not yetover. What follows is the multiplication of the fluid height by the liquid/gass gravity just before re-calibrating the transmitter to the new liquid column height. This yields the pressure in one specificcolumn. It is only after this that the DP pressure transmitter process could be prepared to takepressure measurements.