QUICK REFERENCE GUIDE
Vaisala Surge Protector
WSP152
– Superior 3-stage surge protection
– Tolerates up to 10 kA surge currents
– Both differential and common mode
protection on each channel
– Filtering against HF and RF noise
– Two power channels (±43V, 1.5A) and
two data channels (±13V, 0.16A)
– Designed for use with Vaisala USB cable
220782 for WXT/WMT products
– Adjustable mounting clamp provided for
pole masts, Ø 30 mm … 102 mm
DESCRIPTION
Vaisala Surge Protector WSP152 is a compact-size transient
overvoltage suppressor. It is designed to be used with Vaisala
WXT and WMT transmitters, to protect the host PC against
surges entering through the USB port. For example, a nearby
lightning strike may induce high-voltage surge not tolerable by
the protection of the USB cable or port itself. Thus additional
protection is needed in regions with frequent, severe
thunderstorms, especially when long line cables (>30m) are
used.
Vaisala recommends using the surge protector in installations
where USB cables are used for permanent connections. The
surge protector is always recommended when there is an
elevated risk of lightning strike. The WSP152 also provides
additional filter for blocking the HF and RF interference induced
into the cables in installations to radio transmitter masts, power
line carrier towers etc.
The WSP152 has four channels, two dedicated for power lines
and two for data lines. Each channel uses a three-stage protection
scheme as follows: first there are discharge tubes, then voltage
dependent resistors (VDR), and finally transient zener diodes.
Between each stage there are either series inductors or resistors.
Both differential and common mode protection is provided for
each channel: across the wire pair, against the operating voltage
ground, and against earth.
The WSP152 has a plastic housing with metal reinforcement.
The WSP152 can be mounted on a wall, on the edge of a table,
or to standard Ø 30 mm … 102 mm pole masts with an
adjustable mounting clamp (provided).
0803-059
Figure 1 Operation principle
CAUTION The WSP152 should be placed no further
from the PC than the Vaisala USB cable can
reach (1.8 meters). Do not extend the cable.
INSTALLATION WITH POLE MOUNTING
0803-061
Figure 2 Mounting WSP152 to Pole Mast
Figure 2 illustrates mounting of the WSP152 to a pole mast with
the adjustable mounting clamp. For installation, follow the
procedure below:
1. Fix the steel strip beneath the latch in the back of the
WSP152 unit.
2. Fix the steel strip around the pole mast. You may shorten
the strip to a suitable length.
3. Attach the steel strip ends to the fastener and fasten the
unit to the mast by tightening the fastener's screw.
4. Connect an earthing cable to the connector in the middle
of the WSP152.
5. Connect the USB cable to the M12 connector on the
right side of the WSP152, and the line cable to the left
side.
