Fig. 1 and Fig. 2 show the front view and the back view of BRT-320 PIR occupancy sensor switch respectively.

Wiring Diagrde:

BRT-320 occupancy sensor switch is powered by 24V DC supply: In+: Coming from the positive of power supply; In-: Coming from the negative of power supply; and Load wire: Going to the load.

Fig.3 BRT-320 Wiring Diagram

Fig. 3 shows the wiring diagram. Wiring must be done according to the diagram and the labelled ports of the switch.

Installation Guide:

There are two ways to install BRT-320 PIR sensor switches to the ceiling. Fig. 4 and Fig. 5 show the step-by-step installation instructions respectively.

Cautions:

Avoid mounting the sensor switch close to air vents as the vibration and air flow can reduce the effectiveness of the sensor switch;

1. Installation using a holder

As shown in Fig. 4 a holder is attached to the ceiling using screws first. Then the PIR sensor switch can be easily snapped into the holder. The holder is specially designed for BRT-320 sensor switch. Please talk to our sales representative when placing orders.

Fig.4 Installation with a Holder

2.Installation without a holder

As shown in Fig. 5 without a holder an opening in the ceiling needs to be made first. There are four steps: Step one: Open a hole of 68mm in diameter in the ceiling; (Attach the electrical wires as shown in the Wiring Diagram Fig. 3). Step two: Open the two flexible clamps on the side surface of the sensor switch; Step three: Insert the sensor switch into the hole; and Step four: The clamps will hold the sensor switch onto the ceiling tight and steady.

Fig.5 Installation with a Holder

BRT-320 PIR sensor switch needs a warm-up time about two minutes before it can operate properly. It has dip switches to adjust the delay off time and has a precision tuning screw to adjust the ambient light override threshold as shown in Fib. 6.

Fig.6 Dip Switches and Fine Tuning Screw
 

As shown in Fig. 7 please rotate the front cover counter-clockwise to remove it so that the dip switches and the fine tuning screw are exposed.
 

Fig.7 Removing the Front Cover
 

1. Adjust the delay off time

The 4 dip switches are used to set the delay off time to 8 settings based on different combinations. Fig. 8 shows all the dip switches are in “off” positions. Each combination corresponds to a delay off setting.

(Other factorsettings are available. Please talk to our sales representatives).

2.Adjust the ambient light override threshold

The fine tuning screw is used to set the ambient light override threshold. Use a screw driver to tune the screw gently.

Caution: The tuning screw can not make a full turn. To avoid possible damage to the screw please do not use strong force to tune it.
a. Counter-clockwise to “+” : increase the threshold so that the PIR triggers will be overridden in bright lighting condition; and
b.Clockwise to “-”: decrease the threshold so that the PIR triggers will not be overridden in dark lighting condition.

BRT-320 ceiling mount PIR occupancy sensor can be used for automatically turning on and/or turning off various loads such as lights fans appliances or other kinds of electrical equipment. BRT-320 PIR occupancy sensor switch is perfect for saving energy and bringing convenience and safety to our daily life and work. It has wide applications at various locations such as stairwells corridors washrooms offices conference rooms in homes schools laboratories hospitals offices etc. especially useful where AC power supply is not available.