NFPA 720 has designated the Temporal 4 cadence output pattern for notification of carbon monoxide detection (CO) as the industry standard. In most cases, the annunciation of the Temporal 4 output is limited to the affected area and doesn’t require system wide notification. Silent Knight offers multiple solutions for Temporal 4 output: sounder bases, audio outputs and speaker tone.
The B200S and B200S-LF sounder bases which, used in conjunction with the SK-FIRE-CO detector, can provide the temporal 4 output for CO detection and the Temporal 3 output for fire detection where only localized annunciation is required. In addition, synchronization of the sounder bases for the Temporal 3 and Temporal 4 output can be accomplished through programming on the fire alarm control panel.
In applications where system wide annunciation of a CO alarm is required by the use of horns, you must use either a 4-wire horn/strobe or horn only devices to achieve the Temporal 4 output. Currently, there are no 2-wire horn/strobes that can provide both the Temporal 4 for a CO alarm and Temporal 3 for fire alarm outputs. It is necessary to have a separate horn circuit that can be programmed to provide the Temporal 4 on CO alarms and Temporal 3 on fire alarms, while using a separate output to drive strobes utilizing the appropriate sync protocol. Again, synchronization of the Temporal 3 and Temporal 4 audio outputs can be programmed for the horns through the fire alarm control panel.
When using the 5820XL-EVS in applications where Temporal 4 is required for the speaker tone, a Temporal 4 or a Temporal 4 with the 520 Hz low frequency tone can be programmed for the speaker output. Synchronization cannot be accomplished through the speaker output.
About the Author
Bill Root is the Technical Support Supervisor for Silent Knight. Bill joined Silent Knight in 1988 and is responsible for managing applications and technical support across the Silent Knight product line. Bill is also NICET Level II certified.