A Comparison of Linear Heat Detection Technologies

Linear Heat Detector Comparison Chart
Feature	Protectowire Digital	Analog Integrating ⁽¹⁾	Continuous Thermocouple ⁽¹⁾
Maximum Zone Length	Up to 5,000 FT. (1,524 m)	1,500 FT. (457.2m)	2,000 FT. (609.6m)
Alarm Point Location	YES	NO	NO
Multiple Alarm Points Within Zone	YES	NO	NO
Underwriters Laboratory (UL) Listed	YES	NO	NO
Factory Mutual (FM) Approved	YES	YES	NO
Alarm Point Setting Unaffected by Changes in Ambient Temperature	YES	NO	YES
Compatible with Standard Initiating Devices (Manual Stations, Contact Devices and Smoke Detectors)	YES	NO	NO
Pre-Alarm Capability	YES	YES	YES
Approved for use in Hazardous Locations	YES	YES	? *
Easy to Splice / Terminate	YES	NO	? *
Maximum Alarm Temperature	356°F (180°C)	500°F (260°C)	350°F (177°C)
Expected Service Life	Current Installations Greater than 20 Years	? *	? *
Requires On Site Calibration	NO	YES	NO
Size	5/32 in. (4 mm)	0.09 in. (2.28 mm)	1/8 in. (3.175 mm)
Annual Maintenance per NFPA 72, 1999	Minimal	Heat Test - Must alarm within 1 minute	? *
Accuracy dependent on length	NO	YES	NO
Designed and Manufactured by and ISO-9001 Registered Company	YES	? *	? *
Feature	Protectowire Digital	Analog Integrating ⁽¹⁾	Continuous Thermocouple ⁽¹⁾
(1) - Based on available information at the time of publication 4/13/01 ? * - Information unknown or not available