Orbis I.S. CS Heat Detector with Flashing LED

Brand Features

TimeSaver® Base Patented FasTest® enabling functional testing in four seconds DirtAlert® indicates limit of drift compensation Tolerates extreme operating conditions: -40°C to +70 °C False alarm reduction Flashing LED option

Environmental Characteristics

The environmental performance is similar to that of the Orbis I.S. optical smoke detector but it should be noted that heat detectors are designed to work at particular ambient temperatures. Also classification and BASEEFA certificate number are the same as for the optical smoke detector. Operating and storage temperature: –40°C to +70°C Operating temperature is restricted by the intrinsic safety gas classification. Class T5: –40°C to +45°C Class T4: –40°C to +60°C The detector must be protected from conditions of condensation or icing.

Additional Information 1

Wiring and cable types It is not permitted to connect more than one circuit in the hazardous area to any one safety barrier and that circuit may not be connected to any other electrical circuit. Both separate and twin cables may be used. A pair contained in a type 'A' or 'B' multicore cable (as defined in clause 12.2.2 of BS EN 600079-14:2008) may also be used, provided that the peak voltage of any circuit contained within the multicore does not exceed 60V. The capacitance and either the inductance to resistance (L/R) ratio of the hazardous area cables must not exceed the parameters specified in datasheet PP2479. The reason for this is that energy can be stored in a cable and it is necessary to use cable in which energy stored is insufficient to ignite an explosive atmosphere. To calculate the total capacitance or inductance for the length of cables in the hazardous area, refer to datasheet PP2479, which gives typical per kilometer capacitance and and inductance for commonly used cables. (Note: all Orbis I.S. devices have zero equivalent capacitance and inductance.) Maximum loading of I.S. circuit Because of the finite resistance of the safety barrier, there will be a limit to the current drain which can be tolerated before the voltages on the circuit fall outside the specified limits for Orbis I.S. devices. The system certification allows up to 250 Orbis I.S. detectors to be connected to a single barrier circuit with an end-of-line resistor or not less than 1.8Ω. However, it must be ensure that the voltage available at each detector is above at the minimum specified in the quiescent condition. It is also important to ensure that the alarm load is suitable for the control and indicating equipment. the system certification also allows the use of remote LED indicators. These may be connected to individual detectors or may use a connection common to two or more detectors.

Product Information

The Orbis IS Heat Detector monitors temperature by using a single thermistor network which provides a voltage output proportional to the external air temperature. The Orbis IS range incorporates seven heat detector classes to suit a wide range of operating conditions.

Key Features

Can be used for applications where smoke detectors are unsuitable Ideal for environments that are dirty or smoky under normal conditions Reduced incidences of false alarms Increased reliability of detection

Additional Information 2

Installation It is important that the Orbis I.S. detectors be installed in such a way that all terminals and connections are protected to at least IP20 when the detector is in the base. Special care must be taken with the rear of the mounting base where live metal parts may be accessible. Flush mounting of the base on a flat surface will provide the required degree of protection. The conduit box available from Apollo, part no. 45681-204, is also acceptable for mounting I.S. bases. Apollo also supply a range of deckhead mounting boxes. For more information, please refer to PP1089, bases and accessories brochure. Note that the earth terminal in the base is provided for convenience where continuity of a cable sheath or similar is required. It is not necessary for the correct operation of the detector nor is it provided as a termination point for a safety earth.