Barometric pressure transmitters and atmospheric pressure sensors from COMET, covering 600-1100 hPa. Choose by output signal – 4-20 mA, 0-10 V, RS232, RS485, Ethernet, PoE or WiFi – or step up to a combined temperature, humidity and pressure unit.
Every instrument is calibrated and comes with 3 year warranty. Full selection guide below the range.
Barometric pressure transmitters and atmospheric pressure sensors from COMET, covering 600-1100 hPa. Choose...
Barometric pressure transmitter – RS232 out…
Industrial temperature, humidity, barometric pres…
Industrial temperature, humidity, bar. pressure t…
Thermometer hygrometer barometer with Ethernet in…
Barometric pressure transmitter with user adjusta…
Barometric pressure transmitter – 0-10V out…
WiFi temperature, relative humidity, CO2
WiFi temperature, relative humidity and atmospher…
Ethernet interface and Relays
Barometric pressure transmitter – RS485 int…
WebSensor – remote barometer with Ethernet inte…
Industrial temperature, humidity, bar. pressure t…
Industrial temperature, humidity, bar. pressure t…
Temperature, humidity, pressure regulator with tw…
Web Sensor – remote thermometer hygrometer baro…
Remote thermometer hygrometer barometer with Ethe…
An atmospheric pressure sensor – also called a barometric pressure transmitter, a barometric pressure transducer or simply a barometer – measures the absolute pressure of the surrounding air and converts it into an electrical signal a control system can read. COMET’s barometric range covers 600 to 1100 hPa, which spans sea level to roughly 4,000 metres of altitude.
The distinction that matters when you are specifying one is between a sensor that displays a reading and a sensor that transmits one. A handheld barometer shows a number on a screen for a person to read. A barometric pressure transmitter outputs a continuous signal – 4-20 mA, 0-10 V, or a digital protocol – so a PLC, SCADA system, BMS or datalogger can record it, trend it and alarm on it without anybody standing there. Everything on this page is the second kind. If you need a handheld instrument with a display, see our digital barometers.
PST stocks one dedicated barometric transmitter for every common output signal, so the decision comes down to what your receiving equipment accepts.
The COMET T2114 outputs a two-wire 4-20 mA current loop, the standard for long cable runs and electrically noisy plant environments because current does not degrade over distance. Fit this one when the signal terminates at a PLC analogue input.
The COMET T2214 outputs 0-10 V, generally the simpler choice for building management systems and shorter cable runs within a single plant room.
The COMET T2314 (RS232) and T2414 (RS485) output digital readings directly. RS485 is the one to choose for multi-drop installations where several instruments share a bus; RS232 suits a single instrument connected to one nearby computer or datalogger.
The COMET T2514 puts barometric pressure straight onto the network with a built-in web server, SNMP and email alarms – no analogue wiring and no separate gateway. For combined measurements the T7510, T7511, T7610, T7611 and T7613D add temperature and humidity, with the T76xx series drawing power over the same Ethernet cable.
The COMET W7710 (temperature, humidity, pressure) and W4710 (adding CO2) report over WiFi, which suits retrofits into finished buildings where running cable is the expensive part.
They measure the same thing and the terms are used interchangeably. In practice ‘sensor’ tends to describe the measuring element itself, while ‘transmitter’ describes a complete instrument that conditions the reading and outputs it as a standard signal such as 4-20 mA, 0-10 V or RS485. Every product on this page is a transmitter in that sense: it produces an output signal for a control or recording system, rather than only showing a number on a display.
For ambient atmospheric measurement in Australia and New Zealand, 600 to 1100 hPa is the standard working range and covers every populated altitude, from sea level to around 4,000 metres. Sea-level pressure sits near 1013 hPa and typical weather variation moves it only about 30 hPa either side, so the extra headroom exists for altitude rather than weather. All COMET barometric transmitters on this page cover 600 to 1100 hPa.
Yes. Air pressure falls predictably with height, so a barometric reading can be converted to altitude. Be aware that weather systems shift sea-level pressure independently of your position, so an uncompensated barometric altitude reading drifts as the weather changes. For applications that need stable altitude figures, reference the reading against a known local sea-level pressure.
It depends on what receives the signal. Choose 4-20 mA for long cable runs or electrically noisy environments, because a current loop does not lose accuracy over distance. Choose 0-10 V for shorter runs
into a building management system. Choose RS485 when several instruments share one bus. Choose Ethernet or PoE when you want the reading on the network directly, with web access, SNMP and email
alarms, and no separate gateway. Choose WiFi when running cable is impractical, such as a retrofit into a finished building.
Yes. Instruments can be calibrated in our Australian laboratory, which holds NATA accreditation, and recalibration is available for instruments already in service. Pacific Sensor Technologies is an Australian-owned, ISO 9001:2015 certified company shipping Australia-wide and to New Zealand.
