Description: AUTOCALL TFX THORN ISN-550P ANALOG ADDRESSABLE PHOTOELECTRIC SMOKE DETECTOR SERIES 550 HEAD The 550 series smoke detectors continuously measure smoke density and report this measurement as an analog value to theAUTOCALL TFX series control panel. The AUTOCALL TFX panel uses software algorithms to analyze the transmitted value for pre-alarm, alarm, trouble, or service conditions. Devices are old and show slight discoloration/wear The AUTOCALL TFX panel maintains a moving average of each 550 detector’s transmitted analog values. This average is used asthe long term “background” level of airborne particles and/or contaminants against which the current analog value is compared. Thisensures that the detector’s sensitivity remains constant over time. If the detector’s moving average value exceeds a preset threshold, a trouble signal is annunciated at the AUTOCALL TFX series panel. This signal alerts the operator that the detector requires cleaning and/or maintenance to prevent unwanted alarms. Prior to an actual alarm condition, the AUTOCALL TFX panel will report a lower threshold pre-alarm condition. This is a trouble condition which alerts the operator to a pending alarm. The address of a 550 series detector is set in the base by means of an Xpert Card, which slides into a slot at the side of the detector base. The detector address is printed on the Xpert Card, and is visible from the floor. It is not necessary to ascend a ladder, remove the detector from its base, or to read a set of coded switches to determine the detector’s address. Detector heads may be removed and replaced without system reprogramming ISN-550PThe chamber of the ISN-550P photoelectric detector is an optical arrangement consisting of two main parts: an infrared LED and a photo diode light receiver. The LED emits a burst of collimated light every 2 seconds. In clear air conditions, the photo diode will not receive light from the LED due to its arrangement within the chamber. When smoke enters the chamber, it scatters light onto the photo diode, which is sensed by the detector’s electronic circuitry. The intensity of light on the photo diode is a measurement of smoke density which is transmitted to the AUTOCALL TFX series control panel upon interrogation. To ensure maximum reliability, the LED emits light modulated at about 3KHz, and the photo diode will only react when receiving light at this frequency.
Price: 79.99 USD
Location: Branford, Connecticut
End Time: 2024-10-15T20:41:09.000Z
Shipping Cost: 8 USD
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Item Specifics
All returns accepted: ReturnsNotAccepted
Brand: Thorn
Unit Type: Unit
Model: ISN-550P
MPN: N/A
Unit Quantity: 1
