Apollo XP95 I.S. Heat Detector

FAQ

What is an intrinsically safe heat detector?

An intrinsically safe heat detector is designed for use in hazardous environments where explosive gases or vapours may be present. The XP95 I.S. Heat Detector is certified to Ex ia IIC standards, meaning it limits electrical energy to levels that cannot cause ignition, even in the event of a fault. This makes it suitable for installation in potentially explosive atmospheres such as oil refineries, chemical plants, and offshore platforms.

How does the XP95 I.S. Heat Detector work?

The detector uses a single NTC (Negative Temperature Coefficient) thermistor sensor to continuously monitor ambient temperature. The thermistor provides a voltage output proportional to the external air temperature, which is converted to a digital count value. The detector provides linear approximation over the temperature range of 25°C to 90°C, with a resolution of 1°C per count, enabling accurate temperature monitoring and fire detection.

How many I.S. detectors can be fitted to a circuit?

The number of intrinsically safe detectors that can be installed on a circuit depends on the safety barrier type and the devices fitted. Typically, an I.S. circuit will have a maximum load of 20 detectors. However, this is restricted to 12 optical detectors in an IIC environment. The exact number also depends on how many detector LEDs are allowed to illuminate concurrently by the control and indicating equipment (CIE).

Can I connect a remote LED indicator to this detector?

Yes, the XP95 I.S. Heat Detector has a dedicated drive point (+R terminal) for connecting a remote LED indicator. The remote LED must be a standard high-efficiency red LED and does not require a series limiting resistor as the current is internally limited to approximately 500 µA. The Apollo MiniDisc Remote Indicator (Part No. 53832-070) is suitable for use with this detector. Unlike the standard XP95 range, the remote LED operates in series with the integral LED.

What is the operating temperature range?

The XP95 I.S. Heat Detector has two operating temperature ranges depending on the T-rating: -20°C to +45°C for T5 classification, and -20°C to +60°C for T4 classification. The guaranteed temperature range is -20°C to +60°C. The detector can be stored at temperatures from -30°C to +80°C.

Is this detector suitable for smoky environments?

Yes, the XP95 I.S. Heat Detector is specifically designed for environments that are dirty or smoky under normal circumstances. Unlike optical smoke detectors, heat detectors are not affected by ambient smoke, dust, or particles in the air, making them ideal for industrial environments, kitchens, workshops, and other areas where smoke or dust is regularly present.

What fire alarm systems is this detector compatible with?

The XP95 I.S. Heat Detector features XP95 native digital communication and is compatible with Apollo Discovery and CoreProtocol systems. It connects to a two-wire loop circuit carrying both data and 14V to 22V DC supply, allowing for addressable fire detection with full integration into compatible control panels.

What certifications does this detector hold?

The detector holds multiple international certifications including BASEEFA (BAS02ATEX1289X) and IECEx (IECExBAS12.0091X) for intrinsically safe operation. It complies with the ATEX Directive 2014/34/EU, EMC Directive 2014/30/EU, Marine Equipment Directive 2014/90/EU, and Construction Products Regulation (EU) 305/2011. It also meets EN 54-5 standards for vibration, impact and shock testing.