Bosch FCH?320, Operation Manual

Conventional Automatic Detectors

 System Overview | en

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Bosch Sicherheitssysteme GmbH

Operation Guide

F.01U.002.707 | 8.0 | 2011.10

All sensor signals are analyzed continually by the internal signal analysis electronics and are 

linked with each other. If a signal combination fits the detector’s programmed code field, an 

alarm is automatically triggered.

By linking the sensors (combined detectors), the detector can also be used in places where 

the work carried out gives rise to light smoke, steam or dust.

The FCP-OC320/FCP-OC320-R470 detectors analyze the present CO concentration and adjust 

the threshold of the optical sensor in accordance with the CO concentration. If no CO is in the 

air, the alarm is triggered nonetheless at a certain level of smoke density and above. However, 

the alarm is not triggered if only CO is detected in the air.

The FCP-OT320/FCP-OT320-R470 detectors trigger an alarm in the case of smoke as well as in 

the case of a temperature rise. Additionally, the threshold of the optical sensor is adjusted in 

accordance with the absolute temperature and the rate of temperature rise.

2.4

Features

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Active adjustment of the threshold (drift compensation) if the optical sensor becomes 

contaminated.

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Active adjustment of the threshold (drift compensation) of the chemical sensor.

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Activation of a remote external detector alarm display is possible.

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Optional mechanical removal safeguard (can be activated/deactivated).

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Dust-resistant labyrinth and cap construction.

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Every detector base has a “Chamber Maid Plug” (a cleaning opening with a plug) for 

blowing out the optical chamber with compressed air (not required for the FCH-T 320/

FCH-T 320-R470/FCH-T 320-FSA Heat Detectors).

–

Connectable to Bosch fire panels and the majority of conventional fire panels available on 

the market.

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Two variants with 820 Ω alarm resistor and 470 Ω alarm resistor enables the detector 

application with nearly all conventional fire panels.

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An unscreened cable may be used for the primary line.