Smoke 1: Used where ionisation detectors are normally fitted, especially when there are high ceilings or a risk of free burning fires (chemical stores etc.) or fires that need to be detected extremely quickly.
Smoke 2: Used where optical detectors are normally fitted, when there is a risk of a smouldering fire and for escape routes.
Smoke 3: Designed for use in areas that are prone to nuisance alarms. The reduced sensitivity linked with a time delay feature, means that a higher concentration of smoke needs to be present for a constant time period, before a fire decision is made. For example, this setting is ideal for hotel bedrooms with en-suite shower rooms. The installer or service engineer can change the setting from smoke 2 to smoke 3 if nuisance alarms are a problem whilst still offering optimum protection of a smoke detection setting.
Heat 1 (Rate of Rise): Used where a standard rate of rise detector would normally be used.
Heat 2 (Standard Fixed Temperature – 58ºC approx.): Used where a standard fixed temperature heat detector would normally be fitted, suitable for kitchens etc.
Heat 3 (High Fixed Temperature – 90ºC approx.): Used where a high fixed temperature heat detector would normally be fitted. Suitable for commercial kitchens, boiler rooms etc.