Fortress FAQ – Temperature Ranges for Fortress Devices

Fortress FAQ – What temperature range are Fortress Interlocks and Devices rated for?



Temperature ratings of Fortress devices by type


The recommended temperature range for our products depends what the device is. Fortress interlocks have third party certification of their safety rating provided by TUV SUD, this gives peace of mind that your device has been thoroughly tested. However, it is important to note that this certification is only valid within the specified temperature range.


Heavy and medium duty interlocks in our amGardpromGard and tGard ranges:


Electronic and electromechanical interlocks and other devices such as guard interlocks, safety switches and guard locking devices, are rated to work in the range -25°C to +40°C


Mechanical only devices such as trapped key interlocking and switch devices, are rated to work in the range of -25°C to +80°C


Other Ranges


HGL and Atom (compact electromechanical interlocks) are rated between -20°C to +55°C


Alfred Range (Interlocks for explosive atmospheres) is rated between -20°C to +60°C



Considerations and Exceptions



Any mechanical component in a wet or high humidity environment where temperatures drop below 0° has the risk of ice forming and hindering operation. In most cases this will cause a safe, albeit inconvenient, failure. Consider humidity and the possibility of ice formation or consider using alternative devices. Contact us to discuss the best solution for your environment.



Escape Release Devices

The formation of ice on an escape release device could result in someone becoming trapped inside a hazardous area. For this reason, we do not recommend using escape release in applications below 0°C. Safety keys or interlock blocking are the recommended options to protect operators working inside a safeguarded space, see our full article here on proactive inhibit functions to learn more about these.



Using Guard Locking devices at high temperatures

Solenoid devices can be used up to +60°C if used with a momentary push button to ensure the solenoid is not energized for over 60 seconds.



Use In Extreme Temperatures

It is recommended to mount devices against non-conductive material and take precautions such as gloves when using devices in very hot or very cold environments to prevent injury to operators.



Temperature Requirements in Machinery Safety Standards


Functional Safety: IEC 62061:2015, ISO 13849-1:2015, ANSI B11.26 – 2018, CSA Z432


All functional safety standards have the same message throughout the standard: For the reliability specification of your functional safety system to be valid, you must avoid systemic failure including due to environmental conditions.



Interlocking Devices: ISO 14119:2013


Environmental conditions shall be considered for the selection of the appropriate interlocking devices. The interlocking device shall withstand all foreseeable influences during its expected lifetime.



Further Support


Please contact us if you have any further questions or need support on safeguarding an application outside of these temperature ranges.