Apollo XP95 I.S. Ionisation Smoke Detector – 55000-540APO

Description

Apollo XP95 I.S. Ionisation Smoke Detector – 55000-540APO

The XP95 Intrinsically Safe (IS) detectors are a development of the well-established analogue addressable XP95 range from Apollo. XP95 IS detectors feature all the benefits of the standard range, but are developed specifically for use in hazardous areas. The XP95 I.S. Ionisation Smoke Detector uses a low activity radioactive foil to detect fires by irradiating the air in the smoke chambers and causing a current flow. If smoke enters the chamber, the current flow is reduced leading to an alarm.

Key Features:

Detects super heating and flaming combustibles.

Dual chamber technology.

Wind resistant smoke inlets.

Transient voltage protection.

Fine gauze insect protection.

Lockable security fitting.

Must be connected to a suitable safety barrier and protocol translator.

Operation

The sensing part of the detector consists of two chambers – an open, outer chamber and a reference chamber within. Mounted in the reference chamber is a low-activity radioactive foil of Americium 241 which enables current to flow across the inner and outer chambers when the detector is powered up. As smoke enters the detector, it causes a reduction of the current flow in the outer chamber and hence an increase in the voltage measured at the junction between the two chambers. This analogue voltage signal is converted to a digital signal by the electronic circuitry and transmitted to the control panel on interrogation. The micro-processor in the control equipment then compares the signal with stored data and initiates a pre-alarm or fire alarm as smoke density increases. When a fire condition exists, the panel instructs the detector to switch on its indicator LED.

Operating temperature (ambient):

-20°C to +70°C

(T5) -20°C to +45°C

(T4) -20°C to +60°C