This document provides information about Baumer (Singapore) Pte Ltd's pressure gauges training course. It discusses different types of pressure gauges including Bourdon tube, capsule, bellows, and spiral tube gauges. It describes the manufacturing process of Bourdon tubes including materials, cross sections, and calibration. Key terms like accuracy, measurement range, and protection index are also defined. The document lists various Baumer pressure gauge models for different applications and includes basic questions to specify a pressure gauge.

1. Baumer (Singapore) Pte Ltd
BASG

2. BASG
Title: Pressure Gauges Training Course
Author: Aloysius Lim
Adresse: Baumer (Singapore) Pte Ltd
Blk 21, #03-173, Kallang Avenue,
Singapore 339412
www.baumerprocess.com
Geheim zu haltende Information. Alle Rechte an dieser Information, wie Urheber-, Patent-,
Gebrauchsmuster-, Design- und/oder Markenrechte verbleiben bei der Baumer Holding AG.
Kenntnis von dieser Information lässt Weiterbenutzungsrechte nicht entstehen.
Confidential and proprietary information. All rights, especially the right to apply for and/or
acquire copyright, patent, utility model, design and/or trade mark protection are reserved and
remain with Baumer Holding AG. Notice of this information neither constitutes nor induces any
right for further use.

3. Training course
Pressure
gauges
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4. PRESSURE REFERENCES
Differential
Pressure
Absolute vacuum
(theorical limit )
P gauge = P absolute - P atmospheric
gauge
pressure
Atmospheric
pressure
Absolute
pressure
Atmospheric
pressure
(fluctuating limit )
Line pressure (or
static pressure )
vacuum
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5. Différent types
 Pig tail tube
(from 60 bar to 3000bar)
 Bourdon tube or
« C » tube
(from 400 mbar to 60bar)
 Capsule
(from 0 to 600 mbar)
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6. • Bellows:
Mounted in differential pressure
gauges
Différent types (continued)
• Spiral tube:
Mounted in gas expansion
thermometers
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7. • Raw material: depend on fluid in contact with and
external environment
- Steels
- Brass
- Monel
- 316L stainless steel
- Béryllium copper
• Different tube cross section availability
• Tube thickness according to pressure
Manufacturing of Bourdon tube
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8. • Different cross section of tubes according pressure
range.
bar bar
bar
bar
Manufacturing of Bourdon tubes
(follow)
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9. Basic principle of Bourdon tube
Stub axle
Needle
Fitting
A A
Cross section AA
TRAVEL of tube
Cog sector of
circle
Bourdon tube
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10. • A pressure is applied above the maximum of the
measurement range (30%) for a few moment
• This as the effect of ensuring that deformation
elastic across the measurement range
• And the modulus of elasticity and limit of
proportionnality are increased
First pressurisation
(non elastic deformation)
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11. Metallic pressure gauges (see standard EN 837)
• Accuracy:
• Accuracy is the maximum allowable error
expressed as a percentage of the measurement
range P
• Accuracy class:
• Accuracy class of an instrument is conventionnally
defined as the greatest value of the maximum
allowable error over the specified measurement
range
Terminology of calibration and
metrology
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12. Displacement of Bourdon tube
parameters
• Material
• Diameter and arc
• Section
• Working pressure
• Overpressure
• Time life
Up to now no mathematical model is able to give us the displacement of
the tube according to the different parameters : thickness, lenght, arc, etc
… The displacement of the tube is only given by laboratory tests.
travel of tube
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13. • Tube volume:
• It is internal volume of the tube with P=0
•Absorbed volume:
• The volume of the tube increase with pressure applied this
value is measured in laboratory
• This parameter is important when we use chemical seals
associated with the gauge
Internal volume of the Bourdon tube
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14. Different parts of pressure gauge
Bezelring
Window
Pointer
Gasket
Gasket
movement
Bourdon tube
Case
Safety plug
Pressure
connection
Gasket
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15. Mounting different types of pressure
fittings
Sealing gaskets
BSP
YES NO NPT
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16. Mounting pressure gauges in case
of vibrations
Glycerin bath
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17. Pressure gauge mounting in case of
high fluid process temperature
Hot fluid
SIPHON
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18. Gauges mounted on chemical seals
This application is described in the training
manual : chemical seals.
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19. Gauges mounting to avoid
NO
YES
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20. Pressure gauge mounting with
dampener
Dampener
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21. • Different kinds of contacts are used in the
pressure gauges:
• Dry contacts
• Magnetic contacts
• Inductive contact device
Pressure gauges with contact
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22. Environment influence: protection index (EN60529)
1st number:
Protection against solid bodies
tests
No protection
Protection against solid
bodies greater than 50 mm
(e.g. involuntary hand
contact)
Protection against solid
bodies greater than 12.5
mm (e.g. finger)
Protection against solid
bodies greater than 2.5 mm
(tools, screws)
Protection against solid
bodies greater than 1 mm
(small tools, small wire)
Protection against dust (no
harmful deposit)
Total dust protection
2nd number:
Protection against liquids
tests
No protection
Protection against vertical
drops of water
(condensation)
Protection against drops of
water up to 15° from vertical
Protection against water
sprayed from all directions
Protection against jets of
water sprayed from a nozzle
in all directions
Total water protection
against sprayed water
comparable with large
waves
Protection against effects of
immersion
min.
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23. Pressure gauge mounting
Back flange,
bottom
connection
3 back lugs
bottom
connection
Front flange,
back
connection
Front flange,
bottom
connection
Flangeless
bottom
connection
3 back lugs
back
connection
Flangeless back
connection
Front flange,
strap fixing back
connection
Back flange back
connection
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24. Basic questions to specify a
pressure gauge
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25. 1: Case diameter
• (codification: 4)
• Choose the diameter in mm:
40 50 63 80 100 150 160
2: Pressure range and unit:
• (codification: 10, 11,12)
• ….. bar
• …..mbar
• …..psi
• …..other (please give range and units )
3: Sensing element material:
• Process fluid
• Fluid température max /min
• Corrosive fluid: YES NO
4: Case material:
• (codification: 2 et3)
• Plastic
• Steel
• Stainless steel
Basic question to define pressure
gauges
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26. 5: Mounting type:
• (codification: 6) choice among following mounting
• A B C D E F G (see details)
6: Pressure fitting:
• (codification: 7)
• G1/2A
• 1/2 NPT
• Other (to define)
7: Accuracy class:
• Standard
• Other (to define)
8: pressure reference
• Gauge pressure
• Vacuum
• Compound
• Differential pressure
According to atmosphere
composition
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27. 9: Eventual complementary questions:
• (codification: 8): Dry case
• Liquid filled case against vibrations
• Overpressure (give value):
• ……………………………….
• Protection index:
• Standard case
• Other (give value)
• Eventual electrical contacts:
• CES, CES-A, CEI, CEI+RSI (ADF)
• 1 contact
• 2 contacts
10: Other particular features to be defined
11: Eventual accessories
• Capillary tube
• Siphon
• Adaptor fitting
• Dampener
• Valve
• Restrictor screw
• Chemical seal
• Other
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28. Europeen normalisation
Norm EU
Sensing element
material
Sensing
element type
Accuracy
class
Accuracy limit
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29. • Accuracy is most frequently ±1% of the
measurement range
• Other accuracy classes:
• 0.6 -1 -1.6 - 2.5 – 4
•Calibration and verification version:
• 0.25 - 0.5
•Laboratory version
• 0.1
Accuracy
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30. Accuracy of a pressure gauge EN837
Accuracy class:1
(means ± 1% of full scale)
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31. • SS case,2 1/2” and 4”diameters (MIT3,MIT5)
• ABS case 2 1/2 ” diameter (MMP3)
• Anti-vibrating system
• Filled with dampening liquid
MIT-3, MIT-5 pressure gauge
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32. • From 0 +2bar (0-30psi) to 0+11 bar (0+160psi)
in four ranges
• Triple graduations: bar, kg/cm2:black
psi:red
• IP32 according to NF EN60529
Process control gauge MTR
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33. • Case:stamped brass
• Range from -1+0 to 0 + 600 bar (8700psi)
class1,6
• Water tight can be filled with dampening
liquid (BH)
Industrial pressure gauge type MML
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34. • Ø 50- 63mm
• Robust to harsh environnement, and agressive fluids
• Watertight, can be filled with a dampening liquid
• Class1.6 (option:class 1)
• All SS (MEX) and monel tube(MEM)
Industrial stainless steel MEX and
monel pressure gauge MEM
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35. • 0-2000 to 0- 4000 bar
• High pressure gauge
• Class 1.6
• Safety shield
High pressure industrial gauge
MFP7
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36. • Low pressure measurement
• Class1.6
• Standard version: MTA5
• Stainless steel version:MTX5
• Pressure range from -600+0mbar to 0-+600mbar
Industrial capsule pressure
gauges
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37. • Differential pressure measurement from 0 +0.1 bar to 0 +25 bar
• Static pressure:0.6 to 100 bar
• Equipped with bellows
Differential pressure gauge MX
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38. • DN 100mm
• Class 1
• Vacuum and pressure:-1-0 bar
• Gauge pressure:0-1600 bar
Stainless steel gauge MEX5 type
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39. • Phénolic or polypropylene case
• Class: 0.5
• Ranges:-1- 0 to 1- 1600bar gauge
Pressure gauge MPG/MPE
For oil industry
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