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Note that the 20112 135°F fixed temperature detector is now a legacy product which has been superseded by the 20512 135°F detector which adds the rate-of-rise detection safety feature - at essentially the same price. See Related Products, below.
Almost the only reason to purchase this 20112 is if you need to replace and match a 135°F detector in a pre-existing installation.
Aqualarm fire detection systems are sold both as complete systems, and as separate components typically consisting of an alarm panel and choice of 2-wire remote sensor/detectors.
Typically, 'fire detectors' are actually 'heat detectors' with the internal electrical switch contacts which close under pre-set temperature conditions.
This 20514 Remote Fire Detector is a combination detector with a Fixed 194°F setting as well as Rate of Rise detection for detecting unusually fast rises in temperature - even at lower temperatures.
With a pre-set temperature of 135°F, this detector is most suitable for placement in spaces where you don't expect very high temperatures. Suitable spaces might be a galley, saloon, or very large engine room (typically walk-around with stand-up headroom).
This 20514 Fire Detector is compatible with the Aqualarm 20277 Fire Panel, and 20278 Fire and Smoke Panel, but should work with any manufacturer's low voltage monitor panel that uses 2-wire (2-pole) detectors.
These 2-wire detectors can also be wired in series (as an automatic on/off switch) to a powered bell, horn, or buzzer circuit for use as a fire alarm.
• Normally open contacts
• 12V, 24V, 32V multi-voltage
• UL and ULC Listed
• Complies with Transport Canada, 10.3 Fire Detection and Alarm regulations
• Dimensions: 2-1/2" Dia. x 1" High (Single function detectors are smaller than comparable combination detectors.)