The Simplex 4098-9750 is a TrueAlarm in-duct sensor housing without relay. It mounts a 4098-9714 TrueAlarm analog photoelectric sensor directly inside the air duct, for HVAC duct smoke sensing where sampling-tube housings are not appropriate because of low air velocity or small duct size. The sensor head is ordered separately.
Specifications
| Duct airflow |
0 to 4,000 ft/min (0 to 1,220 m/min) |
| Duct size |
Rectangular, 6" to 36" square |
| Round ducts |
6", 8", 10" or 12" with optional adapter |
| Wiring |
Two-wire, no relay output |
| Communications |
IDNet or MAPNET II |
| External mounting box |
7-1/4" H x 7-1/8" W x 2" D |
| Required sensor |
4098-9714, ordered separately |
| Standard |
UL 268A |
Installation notes
- Assembly includes sensor base assembly, mounting box and cover, and mounting gaskets
- Red alarm LED visible through the transparent cover: pulsing for power on, steady for alarm or trouble
- Templates are supplied for the duct cutout; see installation instructions 574-711
- Intended for applications with controlled dust and humidity
- Compatible panels: 4007ES, 4008, 4010, 4010ES, 4020, 4100, 4100ES, 4100U, 4120, and 2120 CDT configured for MAPNET II TrueAlarm
- Duct detection supplements but does not replace open-area smoke detection
Related models
4098-9751 is the same housing with a programmable local relay (4-wire). Options include round-duct adapters 4098-9819, 4098-9824, 4098-9852 and 4098-9853, the 2098-9806 remote test station and the 2098-9808 remote LED alarm indicator.
Documents
FAQ
Is the smoke sensor included?
No. The 4098-9714 TrueAlarm photoelectric sensor is required and ordered separately.
Does it use sampling tubes?
No. It places the sensor directly in the duct airflow; sampling-tube housings are covered by data sheet S4098-0030.
What is the difference between 4098-9750 and 4098-9751?
The 4098-9750 is two-wire with no relay. The 4098-9751 adds a relay rated 1 A at 28 VDC or 1/2 A at 120 VAC, powered by 24 VDC from the fire alarm system.
Can it be used on round ducts?
Yes, with optional adapters for 6", 8", 10" or 12" round ducts.
