Do you know the signs on the screen?
What information can you get about the pressure gauge by looking at the gauge page? In addition to the measured pressure, there is still a lot of information you can read about what it takes to use a pressure gauge. This article lists all the information and symbols that are mandatory or not in accordance with EN 837 and should be marked on the gauge screen.
Pressure unit
Bourdon tube
Load is the preferred unit of pressure. If SI units are used, they are displayed in kPa or MPa on the display. Marking is mandatory.
Diaphragm / capsule
Load is the preferred unit of pressure. Millibar is used to measure a range of 600 millibars or less. If SI units are used, the display will be Pa, kPa or MPa.
Marking is mandatory.
Accuracy class
The accuracy class is always expressed as a percentage of a range and is associated with the nominal size of the manometer.
Bourdon tube
The defined classes are: [0.1] – [0.25] – [0.6] – [1] – [1.6] – [2.5] – [4]
Marking is mandatory.
Picture
Diaphragm / capsule
The defined classes are: [0.6] – [1] – [1.6] – [2.5] – [4]
Marking is mandatory.
Symbols of various types of pressure sensors
The type of measurement sensor located inside the pressure gauge may be indicated by an icon on the display.
Bourdon tube
Picture
Diaphragm and capsule
Picture
Must be represented by a symbol at maximum scale.
Marking is mandatory.
Marking the maximum working pressure constant
Deviation angle on the page
This should be clear on the screen when the screen is not vertical and rotates at an angle to the horizontal screen. The manufacturer must then calibrate the pressure gauge in that position.
Marking is mandatory.
Mark for screen deflection angle
Calibration temperature
For gauges with accuracy class [0,1] – [0,25] and [0,6], the calibration temperature will affect the measurement if it differs from the reference temperature. The reference temperature is 20 ° C.
Marking is mandatory but not valid for all classes.
Click on the pressure transmitter for more information .
Process environment compression status
Bourdon tube
For gauges with accuracy classes [0.1] – [0.25] and [0.6] where accuracy is only achieved for gas (G) or liquid (F), this must be specified on the display. It is not necessary to use the abbreviations G and F. The term “calibrated for gas” or the name of the process environment is also permitted.
Marking is mandatory but not valid for all classes.
Diaphragm / capsule
Compression status display indicators are not covered by EN 837-3.
Marking is not mandatory.
Number of standards followed
Whether the display can be shown as EN837-1 or not, EN 837-3 standard is followed. When EN 837-1 is identified, you will immediately know that this is a Bourdon tube. When the symbol EN 837-3 is mentioned, it can be a diaphragm or a 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 is specified.
Marking is mandatory.
Device serial number
Bourdon tube
For gauges with accuracy class [0.1] and [0.25], the serial number must be specified. For more accurate gauges, classes [0.6] to [4], this is not required. A serial number is required when a pressure gauge is used for measurement.
Marking is mandatory but not valid for all classes.
Diaphragm / capsule
The pressure gauges used to measure must have a serial number. This is not a requirement for all other gauges.
Marking is required for measurement only.
Material of parts in contact with the fluid
If the fluid parts are not made of brass, bronze, tin or solder, their materials may be listed on the screen.
Marking is not mandatory.
Gage protection pattern
Bourdon tube
The S or S mark for safety pressure gauges along with the EN symbol can be applied to the screen of safety pattern gauges, for:
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 for all sizes.
Diaphragm / capsule
The screen safety pattern mark is not covered by 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” written in English is marked, respectively. Because oil and grease can ignite spontaneously in contact with oxygen, the “no lubrication” symbol must also be specified.
Diaphragm / capsule
Oxygen or acetylene display markings as a process material are not covered by EN 837-3 .
Marking is not mandatory.
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