The ZARC air pressure tag reports barometric pressure, the pressure of the atmosphere at the place it is fitted, in real time, with trends and alerts on limits or rate of change. It suits sites where a rising or falling barometer changes what is happening in the ground, in a tank or in a test. For the pressure between two spaces, such as a room and a corridor, the differential air pressure tag is the right choice.
01
The tag reads absolute air pressure continuously and reports in hectopascals, the same figure as millibars, at the interval set for the site, down to every minute. Each report can carry the current pressure and the maximum, minimum and average for the interval.
Direction matters more than the number. The dashboard shows whether pressure is steady, rising or falling and how fast, which is the part most sites act on. A fall of several hectopascals in a few hours means something different from the same fall over a week.
Alerts can be set on a level, on a rate of change, or on time spent outside a band. A rapid fall raises an alert; a slow seasonal drift does not.
This tag reads the atmosphere. Pressure inside a pipe, cylinder or vessel belongs to the pressure tag, and the pressure between two spaces or across a filter belongs to the differential air pressure tag.
02
Barometric pressure is context: it explains or predicts something else on the site. The uses below are the common ones, and the same reading supports others.
Ground gas readings are assessed against atmospheric pressure, because gas moves out of the ground as the barometer falls. A continuous barometric record beside the gas readings shows the conditions each one was taken in. The tag reports pressure; it is not a gas detector.
Falling pressure draws gas out of a landfill and towards nearby buildings. A live barometer shows when conditions are at their worst, so monitoring visits and checks are timed to them.
A level read by pressure at the bottom of a tank or borehole includes the weight of the atmosphere above it. The barometric figure removes that, so a change in the weather is not read as a change in level.
A rapid fall in pressure comes ahead of a storm. For sites with temporary works, exposed plant or flood risk, that is an early signal with a time on it.
Tests and calibrations are recorded with the ambient conditions they were run in. Pressure sits beside temperature and humidity on the same dashboard, with one export.
Remote water sites use the barometer to correct level readings and to put the weather beside pump and level data.
Some stock and packaging responds to pressure change. A record of the conditions goods were held in supports a quality file or a claim.
Local pressure where the nearest weather station is too far away, or too far below, to trust.
An ambient figure logged beside process readings that depend on it, so a drift in the process is not blamed on the weather, or the reverse.
03
Atmospheric pressure is much the same across a site, so one tag often serves, placed where it is protected. Typical positions:
Indoors, away from doors, fans and extract that disturb the reading.
Beside the borehole or gas monitoring points it gives context to.
Near the tank or instrument whose reading it corrects.
On a wall in the test area, beside temperature and humidity.
Among the goods whose conditions are being recorded.
In a vented housing specified for the location.
04
The dashboard shows current pressure, the trend and the full history for each site, so a gas reading or a level change can be laid against the barometer at that moment. It works out the maximum, minimum and average over any period and the rate of rise or fall. Readings export with their times for reports and assessments.
Limits are set per tag: high, low, rate of change and time outside a band. When one is crossed the alert is raised in real time and goes by email or SMS, and through an app where required, to the people you name, with escalation to further contacts.
05
Barometric tags are fitted where the atmosphere changes the risk or the reading, including:
Ground gas records and weather on site.
Reservoirs, boreholes and remote compounds.
Closed landfill and contaminated land.
Process and test context.
Storage conditions for sensitive goods.
Laboratories and stores.
06
| Parameter | Specification |
|---|---|
| Measurement | Barometric (atmospheric) air pressure, read continuously and reported in real time |
| Pressure type | Absolute |
| Units | hPa, mbar or kPa, set per tag |
| Values reported | Current pressure, maximum, minimum and average for each reporting interval |
| Range and accuracy | Specified to the requirement |
| Sensor position | On the tag, vented to the air it reads |
| Reporting interval | Configurable, down to every minute |
| Limit alerts | High and low limits, set per tag on the platform |
| Trend alerts | Pressure falling or rising, at a rate you set |
| Duration alerts | Time outside a band you set |
| Alert delivery | Dashboard, email or SMS; app where required |
| Recipients | Named people and groups, with escalation to further contacts |
| Missed reports | A tag that misses its reporting interval is flagged in the dashboard |
| Gateway power loss | Raises its own platform alert |
| Dashboard | Live reading, trends, min/max/average, rate of change, shown beside level, temperature and humidity readings; configured to your requirement |
| Records | Every reading time-stamped and exportable for reports and assessments |
| Data | Full reading history; UK-hosted or on servers on your own site |
| Power | Internal battery, up to five years depending on reporting interval |
| Radio | 433 MHz, one-way (transmit only) |
| Radio range | Site-dependent; confirmed by site survey |
| Mounting | Wall or enclosure; vented housing outdoors |
| Environment | Indoor or outdoor, enclosure specified to the location |
| Enclosure | Standard or built to the site; bespoke moulding for volume orders |
| Charges | No per-alert, per-user or licence charges |
| Manufacture | Made to order in the UK |
| Certification | CE marked |
07
Tell us what the barometer needs to explain: gas readings, a level sensor, a test record or the weather.
The tag is built to order with its reporting interval, units and the level or rate-of-change limits agreed.
One fixing and no cable. It is usually placed beside the instruments it supports.
The first readings are checked against a local reference, and the alert routes are tested with the people who will receive them.
Ready to get started? Every deployment begins with a site survey.
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The tag transmits each reading on 433 MHz to a ZARC gateway, which forwards it to the dashboard. There is no receiver on the tag and nothing to configure over the air. On remote sites the gateway's backup battery keeps readings flowing through a mains interruption, and the gateway raises its own alert when its power is lost.
Pressure between two spaces, or across a filter or fan.
Pressure in a pipe, cylinder, vessel or line.
Moisture in the same air.
The third ambient reading.
Barometric pressure, the pressure of the atmosphere where the tag is fitted, in hPa.
No. Holding a room at pressure is a differential measurement. The differential air pressure tag is the right choice.
No. The pressure tag reads pipes, cylinders and vessels.
Yes. Alerts can be set on rate of change as well as on a level.
No. It reports atmospheric pressure, which is the context for ground gas readings. It does not measure gas.
A level read by pressure includes the weight of the atmosphere. The barometric reading removes it, so weather is not mistaken for a level change.
Often one, because atmospheric pressure varies little across a site.
Yes. Every reading is exportable with its time.
No. It has an internal battery and reports by radio to a ZARC gateway.
Up to five years, depending on reporting interval.
Yes, in a vented enclosure specified for the location.
Looking for something else?
Most sensing needs are met by a tag we already build, configured for your equipment. If yours needs a sensor or interface we don't list, we have the engineering to build it. Tell us what you need to measure, and we will tell you how we would do it.
Discuss your requirementTell us what is happening on site, what you need to see, and the event you need to hear about. We will come back with the system that answers it.
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Dorset, BH2 6LA · VAT GB 409644484
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Direct to the team that designs and builds the range. Tell us the equipment and the event that matters.