Barometers and Atmospheric Pressure Measurement Instruments
A barometer measures atmospheric pressure. Seacom supplies barometers, barometric pressure transmitters and recording barographs for weather observation, laboratories, marine applications and environmental measurement systems.
Choose an analogue dial for local observation, a digital barometer for electronic measurement, a transmitter for system integration, or a barograph for a continuous paper-chart record. The range includes Vaisala and Sato instruments for different measurement and recording needs.
Choose the Right Type of Barometer
Instrument type
Main purpose
What to check
Analogue aneroid barometer
Local atmospheric-pressure indication on a dial
Scale readability, measuring range, installation altitude and adjustment requirements
Digital barometer
Electronic atmospheric-pressure measurement
Accuracy, temperature performance, display availability and communication options
Barometric pressure transmitter
Pressure signals for a logger, controller or monitoring system
Power supply, output signal, scaling and receiving-system compatibility
Recording barograph
Atmospheric-pressure trends recorded on a paper chart
Recording period, chart range, consumables and maintenance
Applications requiring a visible record of pressure changes over time.
Confirm the exact model, configuration and availability before ordering. For an existing installation, provide the instrument model and the measurement or recording functions that must be retained.
Applications for Barometric Pressure Measurement
Weather observation: Measure atmospheric pressure and follow changes over time.
Laboratories: Record ambient pressure where it is relevant to a measurement procedure or environmental record.
Marine applications: Select suitable instruments for atmospheric-pressure observation and weather-system integration.
Environmental monitoring: Connect compatible pressure transmitters to data loggers or monitoring equipment.
Local observation and chart recording: Choose a readable dial or recording barograph according to the required record format.
What to Check Before Selecting a Barometer
Pressure range: Confirm the expected atmospheric pressure at the installation altitude.
Accuracy and resolution: Display resolution alone does not establish measurement accuracy.
Operating temperature: Review performance across the actual environmental conditions.
Display or output: Decide whether you need local indication, an electrical signal, recorded data or a combination.
Recording method: Choose between a paper chart and a compatible electronic logging arrangement.
Calibration: Specify any certificate, traceability and periodic checking requirements.
Installation: Check mounting, environmental protection, pressure-port arrangements and access for servicing.
Installation and Pressure Reference
Atmospheric pressure varies with altitude. A local barometer reading may differ from a weather report that presents pressure corrected to sea level. Before comparing readings, confirm the pressure reference and any correction applied.
Install the instrument according to its instructions. For precision measurement, consider pressure disturbances caused by ventilation systems or wind at the sensing location. Protect the instrument from conditions outside its specified operating limits.
Barometric Pressure or Differential Pressure?
Barometric pressure describes atmospheric pressure measured against an absolute reference. Differential pressure describes the difference between two pressure points, such as adjacent rooms or the two sides of a filter.
What is the difference between a barometer and a barograph?
A barometer indicates atmospheric pressure. A recording barograph also produces a pressure history, typically by tracing the measurement onto a moving paper chart.
Is a digital barometer always more accurate than an analogue model?
Not automatically. Compare the specified accuracy, measuring range, temperature performance and calibration requirements of the individual instruments. A digital display with more decimal places does not necessarily mean higher accuracy.
Does a barometer with a digital thermometer measure pressure digitally?
Not necessarily. Some instruments combine a mechanical pressure dial with a digital temperature display. Check how each parameter is measured and displayed.
Can a barometer be connected to a data logger?
Yes, if the selected instrument provides an output compatible with the logger. Check the signal type, power supply, wiring and scaling. A mechanical dial barometer does not normally provide an electrical measurement output.
Why does my barometer differ from a weather website?
The two readings may use different pressure references, locations or observation times. Check whether the weather service reports sea-level pressure and whether your instrument displays local atmospheric pressure before considering an adjustment.
Seacom Product Selection and Technical Support
Seacom Process Instruments supplies measurement instruments and provides technical support for product selection, installation requirements and system integration. Our team can help review your application and identify a suitable model, configuration and accessories.
For barometer enquiries, share your application, installation altitude, required accuracy, display or recording preference, and any output or calibration requirements.
The Vaisala PTU300 combined barometric pressure, relative humidity and temperature in one transmitter. The series is discontinued and has been replaced by a suitable Indigo520 barometric-pressure configuration with an application-specific HMP probe.
Legacy three-in-one pressure, humidity and temperature transmitter
PTU301, PTU303, PTU304, PTU305, PTU307 and PTU308 variants
Former applications include laboratories, meteorology and semiconductor measurement
Current replacement platform: Indigo520 with barometric-pressure measurement
Humidity probe selected according to mounting and process conditions
Existing wiring, outputs and process connections require migration review
The Vaisala PTB110 is a compact, low-power barometer for accurate atmospheric-pressure measurement and integration with data loggers, weather stations and environmental monitoring systems.
Selectable barometric-pressure ranges from 500 to 1100 hPa
The Vaisala PTB330 provides accurate, stable barometric-pressure measurement for professional meteorology, aviation, maritime systems, laboratories and demanding environmental applications.
500 to 1100 hPa or extended 50 to 1100 hPa pressure range
Accuracy up to ±0.10 hPa at +20 °C
Choice of one, two or three Vaisala BAROCAP® pressure sensors
Optional graphical display with trends and measurement history
RS-232 with optional RS-485, RS-422 and analogue outputs
WMO pressure trend and tendency calculations
IP66 housing without display for demanding installations
The Sato Baromex 7612-00 combines an easy-to-read analogue barometer with a digital thermometer for local atmospheric-pressure and room-temperature indication.
Atmospheric-pressure range from 945 to 1045 hPa
Dual pressure scale in hPa and mmHg
Movable index pointer helps indicate pressure change
The Sato 7610-20 is a traditional brass aneroid barometer with an integrated glass thermometer for local atmospheric-pressure and temperature observation.
Atmospheric-pressure range from 930 to 1070 hPa
Secondary pressure scale from 700 to 800 mmHg
Movable index pointer helps indicate pressure change
Glass thermometer covering −10 to +50 °C
Fully mechanical and requires no battery or external power
Buffed brass case with a glass front
Specified for installation up to 500 m altitude
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