Introduction

Since 24VDC motion sensors are not so common the choice is sometimes bigger in a 230V version.

The NIKO 350-20158 is an outdoor 230VAC motion sensor which can switch with detection range of 0 to 13 m. It a wall mounted device and comes in 2 colors, anthracite and white (350-20058).
This article describes how one can easily adapt the motion sensor to a 24VDC version.

Click to show the full specifications

Reference: 350-20058 White or 350-20158 Anthracite
Dimensions (HxWxD): 125 x 72 x 63 mm
Dimensions visible (HxWxD): 125 x 72 x 63 mm
Input voltage: 230 V DC ± 10 %, 50 - 60 Hz
Power consumption: > 0.6
Relay contact 1: NO. (max. 10 A), light-sensitive
Wire capacity: 3 x 1.5 mm² per connection terminal
Maximum load bulb: 2300 W
Maximum load 230V-halogen lamps: 2300 W
Maximum load low voltage halogen lamps: 1150 VA
Maximum load (non-compensated) fluorescent lamps: 1150 VA
Maximum load economy lamps (CFLi): 350 W
Maximum load LED lamps 230 V: 350 W
Maximum capacitive load: 140 uF
Maximum switching current: 80 A/20 ms
Wire input: 2 x 12.5 mm²
Detection angle: 180°
Detection range IR: up to 16 m in diameter from a height of 3 m
Light sensitivity: 5 - ∞ lux
Switch-off delay: 8 - 1800 s
Protection degree: IP54
Protection class: Class II device
Mounting Height: 2 - 3 m
Ambient temperature: -20 - 45 °C
Mounting: surface-mounting
Number of channels: 1 channel
Marking: CE

Source: http://www2.niko.eu/enus/article/350-20058

Modification

The modification involves a small solder hack. The unit needs to be opened with 2 Philips screws which are found on the back.

Once opened, the PCB can easily be removed from the housing. Two things must be done.

The big resistor on the back side of the PCB which is in series with the main input must be removed.
Actually it's not necessary to remove the resistor completely, if one leg is removed it's just fine.
A small bridge must be soldered like in below image.

If the sensor is now connected to 24VDC, the modification will allow the 24VDC to be passed directly onto the bridge rectifier (marked BR on above picture). Since the sensor is normally working internally on 24VDC it makes no difference in operation. The sensors sensitivity and time delay can be adjusted as desired.

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