Description
Mobeye Frost Alert – Outdoor Temperature Monitoring

Accurate temperature monitoring devices and remote frost alarms are essential for effective frost protection. The Mobeye ThermoGuard outdoor version, also known as the Mobeye Frost Alert CM4200X, is designed to warn you promptly of weather conditions that can cause serious crop damage. As long as the temperature stays above the preset minimum, the system remains inactive and no response is required. The moment the temperature drops into the alarm range, the device immediately alerts you with both a phone call and a text message, delivering precise, local temperature data so you can take timely action.
Spring frost occurs when temperatures fall below freezing (0 °C / 32 °F) during the spring growing season, usually in March, April, or May. These cold nights can severely damage emerging buds, young leaves, and sensitive agricultural crops. Clear nights are particularly risky, often leading to extensive losses in vineyards and fruit orchards.
The CM4200X is a frost and freeze alarm dialler developed for reliable outdoor use. It is especially valuable for farmers and growers who need to protect plants and crops from frost damage. In spring, when night-time temperatures approach freezing and fruit trees are in bud, orchardists and vineyard managers must act quickly to prevent losses. Protection methods include activating irrigation systems and wind machines to form a protective ice layer around blossoms. The Mobeye Frost Alert delivers timely warnings when temperatures drop too low, enabling rapid intervention and effective frost protection.
Frost Alarm for Orchards
The Mobeye detector wakes the fruit grower up via phone once the predetermined temperature is attained. Subsequently, the grower can assess whether protective measures, such as sprinkling or other interventions, are necessary for safeguarding the blossoms.
The Mobeye ThermoGuard CM4200X offers continuous temperature monitoring and alerts farmers and fruit growers when temperatures become critically low. This battery-powered alarm system can call and/or send texts to pre-defined telephone numbers when the temperature falls below the critical threshold. Its IP66 rated waterproof enclosure makes it suitable for outdoor use.
Frost Warning for Frost Workers and Road Gritters
This versatile solution benefits not only fruit growers and farmers but also workers in various fields during frost, including those in construction, highway maintenance, salt truck operation, and road gritters.
ThermoGuard for Wet Situations
Other situations in which the CM4200X is appropriate include cooling cells with elevated humidity levels or environments where the ThermoGuard may be exposed to moisture. Its IP66-rated outdoor enclosure makes the CM4200X suitable for use in wet or damp conditions.
Mobeye Frost Alert Systems
Note: The Mobeye CM4200X is a battery-operated temperature alarm with an integrated communication module and an outdoor IP66-rated enclosure. For those who require temperature trend analysis in addition to alarms, the extended version, Mobeye CML4275, is available.
For a extensive comparison, see Mobeye Frost Alert Systems: CM4200X vs CML4275.
How does the Frost Alert CM4200X Works
- Choose the Mobeye SIM card in combination with the Mobeye Portal (management tool) or purchase a local SIM card (normal size).
- Insert the SIM card and batteries.
- The battery life exceeds the yearly frost period, even at low temperatures.
- You’ll receive a notification when it’s time to replace the batteries.
- Set the lower temperature limit.
- Add at least one telephone number as an alarm receiving number.
- In the event of an alarm situation, you will receive a phone call and SMS text messages (with current temperature).
Mobeye Portal
You can use your Mobeye Frost Alarm either as a standalone solution or in conjunction with the Mobeye Portal and App for enhanced functionality and user-friendliness. With the Mobeye Portal, large companies can remotely monitor temperatures across multiple orchards.
Note: Access to the Portal is exclusive to Mobeye devices using Mobeye SIM cards.
Typical Applications for Mobeye Frost Alert
The Mobeye Frost Alert CM4200X is a dependable and precise frost alarm and temperature alert solution designed to prevent frost damage in sensitive environments. It continuously tracks temperature changes and sends timely notifications when levels drop to critical points. By providing early frost warnings, it helps protect crops, plants, and equipment, ensuring productivity and safety across agricultural and industrial operations.
The Mobeye Frost Alert is widely used by:
- Farmers protecting fields and crops from frost damage
- Fruit growers and orchardists monitoring temperature-sensitive blossoms
- Winegrowers and vineyard managers maintaining ideal conditions for vines
- Gardeners and tree cultivators ensuring plant health during cold periods
- Garden enthusiasts preventing frost damage to ornamental plants
- Salt and grit workers preparing for freezing road conditions
- Cooling cell operators maintaining stable conditions in damp or refrigerated environments
For those who require temperature trend analysis in addition to alarms, we recommend the extended version, Mobeye CML4275. For an indoor freeze alarm dialler, we recommend the Mobeye ThermoGuard CM4200.














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