Vaisala SPH20 - Manual

© Vaisala 2012. All rights reserved.
*M010016EN*
For warranty information, visit our Internet pages at:
www.vaisala.com/warranty.html
INSTALLATION AND
MAINTENANCE GUIDE
Static Pressure Head
SPH20
– Eliminates effectively wind
disturbances from pressure
measurements
– Adaptable to many barometers,
directly to Vaisala PTB210
– Fits to severe outdoor applications
INTRODUCTION
Vaisala model SPH20 Pressure Head provides an effective
elimination of pressure variations in the barometer due to the
wind. The heated plates offer an excellent outdoor performance
in cold, icy and wet conditions. The SPH20 can be integrated
directly with the Vaisala PTB210 barometer or any other
barometer.
ASSEMBLING
Screw the lower bar to the threaded sleeve of the lower plates
(with 6 holes).
MOUNTING
Select an open location, prefereably a place higher than the
surroundings, with no buildings or trees nearby. Attach the
SPH20 to a horizontal pole using a mounting plate. A suitable
pole is Vaisala sensor mast, type DKP12. However, any other
horizontal pole with two screws (M6) in a distance of 41 mm can
be used.
NOTE The recommended distance of the SPH20
from the vertical pole is at least 1 m.
1. Loosen the two fixing screws of the pole and fix the SPH20
into the pole as indicated in Figure 1.
2. Attach the SPH20 by tightening the screws. (The pressure
Head is removed by loosening the two screws).
CONNECTION TO THE VAISALA PTB210
Visualization in Figure 2.
1. Detach the threaded nipple and the gasket (see Figure 1).
2. Place the O-ring into the barometer groove.
3. Attach the PTB210 to the SPH20 with two fixing screws.
CONNECTION TO OTHER BAROMETERS
Connect the barometer to the threaded nipple (Figure 1) by using
a flexible, airtight tube with an inner diameter of 4 mm. To
prevent condence water accumulation in the tube, make sure the
entire length of the tube goes downwards from the barometer to
SPH20.
Figure 1 SPH20 Installation
Figure 2 PTB210 Barometer Connection
QUICK CONNECTOR WIRING
input (+): terminals 1 and 2
input (-): terminals 3 and 4
Always connect both inputs!