Apollo Series 65 Diode Mounting Base for Conventional Systems 45681-201APO

What this diode base does

A detector base is the fixed part of a fire detector. The cables end here, and the detector head then fits on to it.

This Apollo base adds a diode, for circuits that also carry manual call points. It is a conventional part, so the panel reports by zone and not by device.

How it works

• The diode: a diode lets current pass in one direction only. With the head removed it can keep the line connected to the devices further along, while the panel can still sense the missing head.
• Why it matters here: a call point further down the circuit should still raise the alarm while a detector head is off. That is the usual reason for fitting this kind of base.

Installing it

• Line in and out: follow the wiring diagram for L1 IN, L1OUT and L2. The incoming and outgoing positive line use separate terminals, because the diode sits between them.
• Last device: the circuit ends with an end-of-line device. Use the value your panel maker specifies.
• Remote LED: a common Remote Indicator can be added using the -R terminal.

Planning your system

Allow one base per detector position and order the heads separately. A heat detector from the Series 65 range is one option.

The circuit also needs a conventional panel that suits diode bases, and your manual call points. Check the panel's instructions first.