What is the primary difference between the two types of heat detectors covered?

Fixed-temperature detectors alarm when the ambient temperature reaches a predefined threshold, while rate-of-rise detectors alarm when the temperature increases at an abnormally fast rate (e.g., more than 8°C per minute), regardless of the initial temperature.

Does this standard provide spacing rules for mounting detectors on a ceiling?

No, IS 2175 is a product specification and testing standard. Spacing and layout design rules are provided in IS 2189.

Does this standard cover smoke detectors?

No, this standard is strictly for heat-sensitive fire detectors. Smoke detectors are covered under IS 11360.

IS 2175

: 1988

Specification for heat-sensitive fire detectors for use in an automatic fire alarm system

CurrentSpecializedSpecificationBIMFire Safety · Fire Fighting

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This standard specifies the constructional, operational, and performance testing requirements for heat-sensitive fire detectors (both fixed-temperature and rate-of-rise types) intended for use in automatic fire detection and alarm systems.

Specification for heat-sensitive fire detectors for use in an automatic fire alarm system

Quick Reference Values

typical fixed temperature threshold58°C to 78°C

rate of rise activation threshold8°C to 15°C per minute

vibration test frequency range10 Hz to 150 Hz

dry heat test temperatureMaximum application temperature + 5°C

Practical Notes

Heat detectors should be utilized in environments where smoke detectors are likely to cause false alarms, such as commercial kitchens, boiler rooms, and highly dusty areas.

This code focuses on the manufacturing and testing of the detector unit itself. For guidelines on spacing, zoning, and installation, engineers must refer to IS 2189.