Meaning of different symbols on the pressure gauge screen
Looking at the pressure gauge screen , what can we understand about the pressure gauge?
In addition to the measured pressure, there is still a lot of information that you can read and it is necessary to use the pressure gauge. This article covers all the information and symbols that must be numbered on the page according to EN 837, mandatory or not.
Pressure unit
Bourdon tube
Load is the preferred unit of pressure. If SI units are used, the screen is displayed in kPa or MPa.
Marking is mandatory.
Diaphragm / capsule
The rod is the preferred unit of pressure. mbar is used to measure ranges of 600 mbar or less. If SI units are used, the indicator will be in Pa, kPa or MPa.
Marking is mandatory.
Accuracy class
The accuracy class is always expressed as a percentage of the length and is related to the nominal size of the manometer.
Bourdon tube
Defined classes: [0,1] – [0,25] – [0,6] – [1] – [1,6] – [2,5] – [4]
Marking is mandatory.
Diaphragm / capsule
Defined classes: [0,6] – [1] – [1,6] – [2,5] – [4]
Marking is mandatory.
For more information, you can read the article on pressure transmitter and contact us if you have any questions.
Symbol of the pressure element type
The type of measuring element inside the barometer may be indicated by a mark on the display.
Bourdon tube
Marking is not mandatory.
Diaphragm / capsule
Marking is not mandatory.
Maximum working pressure of
Pressure gauges that can operate continuously at maximum scale without damaging accuracy over a period of time must have a symbol at maximum scale value.
Marking is mandatory.
Fixed working pressure detection mark
Confused page tilt angle
When the dial is not vertical but rotates at an angle to the horizontal screen, it should be shown on the dial. The manufacturer must then calibrate the pressure gauge in that position.
Marking is mandatory.
Mark for the angle of inclination of the gage plate
Calibration temperature
For measurements with accuracy classes [0,1] – [0,25] and [0,6], the calibration temperature is shown on the dial if it differs from the reference temperature. The reference temperature is 20 ° C.
Marking is mandatory but not for all accuracy classes.
Process environment aggregation status
Bourdon tube
For measurements with accuracy classes [0,1] – [0,25] and [0,6] where accuracy is obtained only for gas (G) or liquid (F), this should be on the number plate To be determined. The abbreviations G and F are not mandatory. The term “calibrated for gas” or to indicate the name of the process environment is also permitted.
Marking is mandatory but not for all accuracy classes.
Diaphragm / capsule
Collection status indicator is not covered by EN 837-3.
Marking is not mandatory.
Number of standards followed
The dial pad shows whether EN837-1, if not EN 837-3, is complied with. When EN 837-1 is marked, you immediately know it is a Bourdon tube. When marked EN 837-3, it can be a diaphragm or capsule pressure gauge.
Marking is not mandatory.
Manufacturer name
For easy retrieval of the manufacturer or supplier of the gauge, the name or logo of the manufacturer and / or supplier must be specified.
Marking is mandatory.
Device serial number
Bourdon tube
For measurements with accuracy classes [0,1] and [0,25], the serial number must be specified. For less accurate measurements, classes [0,6] to [4], this is not mandatory. A serial number is required when the pressure gauge is used for measurement purposes.
Marking is mandatory but not for all accuracy classes.
Diaphragm / capsule
The pressure gauges used for the measurement purposes must have a serial number. This is not a commitment for other measuring devices.
Marking is mandatory for metrology only.
Material of parts in connection with the process
If the soaked parts are not made of brass, bronze, tin or hard solder, their material may be displayed on the screen.
Marking is not mandatory.
Safety measurement patterns
Bourdon tube
The S or S mark for the safety pressure gauge with the EN number can be applied to the dial of the safety measurement patterns, for the following:
Pressure gauge size 40 to 80, without baffle wall (type S2)
Pressure gauge size 40 to 250, with baffle wall (type S3)
Marking is mandatory but not required for all sizes.
Diaphragm / capsule
The safety pattern mark on the plate does not cover EN 837-3.
Marking is not mandatory.
Process environment: Oxygen or acetylene
Bourdon tube
If a pressure gauge is used to measure the pressure of oxygen or acetylene, the word “oxygen” or “acetylene”, which is mandatory in English, should be marked, respectively. Because oil and grease can ignite on their own in contact with oxygen, the “no lubrication” sign must also be marked.
Marking is mandatory.
Diaphragm / capsule
The mark on oxygen or acetylene on the plate as a process medium is not covered by EN 837-3.
Marking is not mandatory.
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