A limit needs a live reading
A wind alarm system monitors conditions against the limits an operation must work within. It combines a wind sensor positioned to measure the relevant conditions with gust measurement and alarm logic in a display, logger or control system. Gill ultrasonic wind sensors measure wind speed and direction without moving parts, providing data for site monitoring and alarm systems.
How do wind alarms support operating limits?
A wind alarm compares a live reading from a fixed sensor with the operation’s wind limit and warns the responsible person when conditions approach it. Gusts matter as much as the average, and the sensor has to sit where the risk is, such as a crane jib or stage roof. The display or control system raises the alarm against configured thresholds.
Crane lifts, temporary stages, roof panels on hoists and container gantries can all have defined wind limits. When conditions approach those limits, the people responsible need a current, reliable reading that reflects the wind where the operation is exposed.
A forecast helps plan work, but it cannot confirm the conditions at a particular crane jib, stage roof or elevated structure. A fixed wind sensor provides ongoing measurements at its installation point, allowing the receiving display or control system to communicate conditions against configured thresholds.
The measurement is only part of the system. Sensor location, gust calculation, threshold settings and how warnings reach the responsible person all matter.
What makes wind alarm monitoring difficult?
Wind limits may be straightforward to specify, but measuring and communicating conditions reliably requires several factors to be considered together.
Gusts, not just average wind speed
Mean wind speed can remain below an operating limit while short-lived gusts exceed it. The measurement and averaging period must therefore match the quantity specified by the operation or equipment supplier.
WindSonic: WMO-compliant gust measurement from a rolling average
Measure where the risk occurs
Wind conditions can vary with height, surrounding structures and local exposure. A sensor at ground level may not represent the conditions experienced by a crane jib or elevated structure. The installation position should reflect the risk being monitored.
Connect the measurement to the alarm
The wind sensor provides the measurement data. Alarm thresholds, warning logic and notification arrangements are handled by the receiving display, logger or control system, according to the system design.
Available interfaces vary by configuration and product. Analogue, serial and Modbus options can support integration with suitable site systems.
Reduce mechanical failure points
Gill ultrasonic wind sensors measure wind without moving parts. This removes bearings and other mechanical components associated with conventional moving-part anemometers, which can be advantageous in exposed installations.
Wind alarm monitoring options
Forecasts, handheld anemometers and fixed monitoring systems serve different purposes. The appropriate approach depends on whether the requirement is planning, a spot check or continuous monitoring against a defined limit.
| Consideration | Weather forecast | Handheld anemometer |  Fixed sensor and alarm system |
|---|---|---|---|
| Measurement | Predicted conditions | Wind at the point and time of measurement | Continuous wind measurement at the installation point |
| Gusts | Forecast gusts | Depends on the instrument | Depends on the sensor and configured measurement |
| Alarm | No direct site alarm | Not usually integrated into a site alarm | Thresholds handled by the receiving system |
| Recording | Forecast history, where available | Depends on the instrument | Available where the receiving system records data |
| Best suited to | Planning work | Spot checks | Operations requiring continuous monitoring against wind limits |
Forecasts help with planning and handheld instruments provide useful additional checks. A fixed sensor can support ongoing operational decisions, provided it is appropriately positioned and integrated with the site’s alarm arrangements.
Factors to consider when specifying a system
Sensor position
The ideal measurement point may be difficult to access or connect to the receiving system. Consider exposure, height, mounting, cable routing and maintenance access, while ensuring the location represents the conditions relevant to the operation.
The wind limit and alarm logic
The operational limit and the response to reaching it must be defined by the responsible organisation, equipment requirements and relevant safety procedures. Confirm whether the limit refers to mean wind speed or gust speed, and ensure the measurement and alarm settings are consistent with that definition.
Measurement range
Select a sensor with a wind-speed range appropriate to the conditions it may encounter.
WindSonic: measures wind speeds up to 60 m/s.
WindSonic 75: measures wind speeds up to 75 m/s.
WindUltra: measures wind speeds up to 75 m/s.
WindObserver 90: measures wind speeds up to 90 m/s.
These are model-specific maximum measurement ranges, not recommended operating limits for a particular activity. The limit for the operation must be established separately.
Cold-weather operation
Where icing is a risk, a heated model may be appropriate. WindSonic M and heated WindObserver options are available for relevant installations. Heater power requirements and the expected environmental conditions should be included in system design.
Gill sensors and displays for wind monitoring
Gill wind sensors provide wind measurements for suitable displays, loggers and control systems. Product selection depends on the required wind range, environmental exposure, heating, interfaces and wider system architecture.
WindSonic
Compact ultrasonic wind sensor
WindSonic is used for wind monitoring on structures and exposed sites. Its ultrasonic measurement has no moving parts, and the range offers interface options for integration with suitable monitoring systems.
WindObserver
Heavy-duty ultrasonic wind sensor
WindObserver is designed for demanding installations, with a stainless-steel construction and heated options for exposed environments.
Wind displays
Present wind data where decisions are made
Gill wind displays present wind measurements to operators and other personnel. The appropriate display depends on the installation and the information that needs to be visible, including whether the application requires a marine or multifunctional TFT display.
Alarm and notification functionality should be confirmed for the selected display and complete system.
insight
Why gust measurement matters
Many operational wind limits are expressed as a wind speed, but the distinction between mean speed and gust speed can be critical. A short-lived increase in wind can affect a suspended load or exposed structure even when the average remains below the specified limit.
A gust is a peak measured over a defined period. The result therefore depends on how the gust is calculated. WindSonic provides a WMO-compliant gust measurement calculated from a rolling average.
The measurement must correspond to the limit being monitored. Comparing a gust limit with a mean wind-speed reading can produce a misleading assessment of the conditions.
Before installation, confirm the definition of the wind limit with the relevant equipment supplier or the site’s lifting plan and safety procedures. The sensor, measurement settings and receiving system must be specified to support that requirement.
The full explanation is in How accurate does a wind sensor need to be?
Applications and technical resources
ApplicationCrane wind monitoring
Wind measurements for lifting operations where conditions can affect suspended loads.
ApplicationUrban construction sites
Wind and weather monitoring for construction work in constrained urban environments.
ApplicationTemporary events and crowd safety
Wind monitoring for temporary stages, structures and event environments.
Application noteContainer terminal operational safety
An application note covering the use of WindSonic and WindObserver at container terminals.
Speak to our team
Tell us what you need to measure, where and under what conditions. We’ll help you work out the appropriate approach.
Frequently asked questions
A wind alarm system monitors wind measurements against defined operating thresholds and communicates when those thresholds are reached. It typically combines a wind sensor with a display, logger or control system that handles the alarm logic and notification. The exact functionality depends on the system configuration.
The sensor should be positioned to measure wind conditions relevant to the crane operation, taking account of the jib or other exposed components, height, surrounding structures and local airflow. A ground-level reading may not represent conditions at an elevated working point. Follow the crane manufacturer’s requirements and the site’s monitoring and safety procedures when deciding the location.
Use the measurement specified by the relevant equipment manufacturer, operating procedure or safety plan. Mean wind speed and gust speed are different quantities. If the limit is defined in terms of gusts, the monitoring system must use a compatible gust measurement and period.
Gill wind sensors provide measurement data to a suitable receiving system. Alarm thresholds, warning logic and notifications are generally handled by the connected display, logger or control system. Confirm the required outputs, compatibility and alarm functionality when specifying the complete installation.
A gust is a short-term peak calculated over a defined measurement period. The reported value depends on the method and period used. WindSonic offers WMO-compliant gust measurement calculated from a rolling average. Ensure the configured measurement matches the definition used by the operational wind limit.
The choice depends on the maximum wind speed to be measured, environmental exposure, heating requirements and system interfaces. WindSonic measures up to 60 m/s, WindSonic 75 and WindUltra up to 75 m/s, and WindObserver 90 up to 90 m/s. These maximum ranges should not be confused with the safe operating limit for the activity being monitored. Check the individual model specifications before selection.