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&NAUTOCALL TrueAlarm Analog Sensors- Photoelectric and Heat; Standard Bases and Accessories TrueAlarm sensors In a slowly developing fire,the temperature may not increase rapidly enough to operate the rate-of-rise feature.However,when the Features temperature reaches the rated fixed temperature setting,it triggers an alarm. Sealed against rear air flow entry You can program TrueAlarm heat sensors as a utility device to monitor Interchangeable mounting for temperature extremes in the range of 32°F to 155°F(0°C to 68°C). EMI/RFI shielded electronics This feature can provide freeze warnings,or alert you to HVAC system Heat sensors: problems.Refer to panel specifications for availability. - Selectable rate-compensated,fixed temperature sensing with or Figure 5: A4098-9733 heat sensor with base without rate-of-rise operation Table 2:Rated spacing distance between sensors -7/8"(124 mm) Fixed Temp. UL and ULC FM Spacing,Either Fixed Setting Spacing Temperature Setting LED status indicator 1350F(57.2°C) 60 ft x 60 ft 20 ft x 20 ft(6.1 m)for fixed 190°F(88°C) (18.3 m) temperature only.RTI=Quick 2 3/8 50 ft x 50 ft(15.2 m)for fixed (60 mm) 155°F(68°C) (1 ft x2.2 m)) ft temperature with either rate-of-rise selection.RTI=Ultra Fast Note:190°F(88°C)ratings only apply to the A4098-9734 sensor. Smoke sensors Figure 6: A4098-9734 high temperature heat sensor with base Photoelectric technology sensing - -T 360'smoke entry for optimum response -7/8"(124 mm) Built-in insect screens LED status indicator A4098-9714 photoelectric sensor 2-3/8" TrueAlarm photoelectric sensors use a stable,pulsed LED light source (60 mm) and a silicon photodiode receiver to deliver low power smoke sensing. There are three user-selectable sensitivities for special applications for each individual sensor:0.2%,0.5%,and 1%for each foot.Standard sensitivity is 1.25%to 3.1%for each foot.The fire alarm control unit can IF vary the sensitivity for normal applications between 1.25%and 3.1%for WARNING:In most fires,hazardous levels of smoke and toxic gas each foot. can build up before a heat detection device would initiate an alarm.In Note:Fixed sensitivity settings higher than 1.0%for each foot are not cases where Life Safety is a factor,the use of smoke detection is highly UL268 7th Edition compliant. recommended. The sensor head design provides 360'smoke entry for response to Application reference smoke from any direction. Due to its photoelectric operation,air velocity Only choose sensor locations after careful consideration of the physical is not normally a factor,except for impact on area smoke flow. layout and contents of the area that you want to protect.Refer to NFPA Figure 4: A4098-9714 photoelectric sensor with base 72,the National Fire Alarm and Signaling Code.On smooth ceilings,you can use a smoke sensor spacing of 30 ft(9.1 m)as a guide. -7/8"(124 mm) For detailed application information including sensitivity selection,refer II'--LED status indicator to A4098 Detectors,Sensors,and Bases Application Manual(574-709AQ. 2-1/8" (54 mm) A4098-9733 and A4098-9734 heat sensors TrueAlarm heat sensors are self-restoring and provide rate- compensated,fixed temperature sensing with or without rate-of-rise temperature sensing.The sensor measures the local temperature for analysis at the fire alarm control unit. You can select rate-of-rise temperature detection at the control unit for either 15°F or 20°F,(8.3°C or 11.1°C)for each minute.Fixed temperature sensing is independent of rate-of-rise sensing and you can program it to operate at 135°F or 155°F(57.2°C or 68°C).The A4098-9734 sensor provides an additional 190°F(88°C)set point. Page 3 AC4098-0019 Rev.33 06/2023