manometer
Let an agent explain manometers and pressure gauges, relay principles, types, units and calibration from metrology and engineering sources, describe the named instruments, note safety with pressurised systems and mercury, and distinguish manometers from barometers, sphygmomanometers, pressure transducers and flow meters.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain manometers and pressure gauges, relay principles, types, units and calibration from metrology and engineering sources, describe the named instruments, note safety with pressurised systems and mercury, and distinguish manometers from barometers, sphygmomanometers, pressure transducers and flow meters.
An instrument that measures pressure, strictly a device using a column of liquid such as a U-tube manometer, and more broadly any pressure gauge, including Bourdon tube and bellows gauges, oil-pressure meters in engines, the finimeter used to show the pressure in diving cylinders and breathing apparatus, vacuum gauges such as ionisation gauges and the mercury-based McLeod gauge, and deadweight testers used as primary standards to calibrate other gauges; pressure equipment must be rated and handled safely.
What it is for: Measuring pressure.
It can be explain principles and types; relay units and calibration; describe named instruments; relay safety considerations.
Distinguishing features
Pressure measurement
Liquid column or mechanical
Gauge or absolute
Calibration traceable
What it looks like
U-shaped tubes of liquid or round dial gauges with needles, or electronic readouts.
Physical character
Bourdon tube patented: 1849 year - Eugene Bourdon
SI unit: pascal unit
McLeod gauge: 1874 year - Herbert McLeod
How it is recognised
Pressure measuring instrument
Oil-pressure meter, deadweight tester, bellows pressure gauge, finimeter, ionisation vacuum gauge, McLeod gauge
Barometers measure atmospheric pressure; sphygmomanometers measure blood pressure; transducers output electrical signals; flow meters measure flow
Related models
is a kind of - in registry terms
measures -
includes -
is contrasted with -
In practice
Families and kinds
liquid column manometers
Bourdon tube gauges
bellows and diaphragm gauges
vacuum gauges
deadweight testers
digital pressure gauges
Standards and regulation
EN 837 and ASME B40.100 pressure gauge standards
Pressure Equipment Directive
Minamata Convention limits on mercury instruments
Failure modes and hazards
Gauge failure under overpressure
Mercury exposure from broken instruments
Misreading gauge versus absolute pressure
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.manometer
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What a manometer is.
Definition.
Definition
Definition.
Definition
Definition.
- What is a manometer, and how does it differ from barometers, sphygmomanometers, transducers and flow meters? definition
- Is the question about lab work, engines, diving, HVAC or safety? boundary
Named
Named instruments.
Named
Named.
- What are oil-pressure meters, deadweight testers, bellows gauges, finimeters, ionisation gauges and McLeod gauges? definition
- Which entry fits the specific instrument? action
Physics Principles.
Science.
Liquid column
Liquid columns.
Liquid column
Liquid column.
- How does a U-tube manometer relate height difference to pressure? measurement
- Which references are standard? provenance
Units
Units.
Units
Units.
- How do pascals, bar, psi and mmHg relate, and what is gauge versus absolute pressure? measurement
- Which sources are cited? provenance
Practice Calibration and safety.
Regulation.
Calibration
Calibration.
Calibration
Calibration.
- How are gauges calibrated against deadweight testers? provenance
- Which entry fits calibration? action
Safety
Safety.
Safety
Safety.
- What safety rules apply to pressure gauges and mercury instruments? provenance
- Which entry fits Minamata Convention on Mercury? action
Context Applications.
Context.
Diving
Diving gauges.
Diving
Diving.
- How do divers use submersible pressure gauges? provenance
- Which entry fits scuba set? action
Vacuum
Vacuum measurement.
Vacuum
Vacuum.
- How do vacuum gauges cover different pressure ranges? provenance
- Which entry fits vacuum gauge? action
What the second pass must settle
- Should vacuum gauges be a separate entry?
- How should metrology sources be linked?
- Should finimeter be linked to diving equipment?