Installation and Maintenance
SPH20 Static Pressure Head
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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.
ASSEMBLAGE
Screw the lower bar to the threaded sleeve of the lower plate
(with 6 holes)
MOUNTING
Select a location where no nearby objects will effect the pressure field. A suitable location would be an open place with no buildings or trees in immediate surroundings. Attach the SPH20 to a horizontal pole using a support flange. 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! For achieving the best operation conditions, it is recommended to have distance of 1.0 m or more between the
SPH20 and the vertical pole.
- Attach the SPH20 to the pole by using two fixing screws
(M6) as indicated in Figure 1.
The SPH20 can be removed by loosening the two screws.
ELECTRICAL CONNECTIONS
As shipped from factory, the power supply default is 12 V.
NOTE If the 24 V power supply is used, open the cover of the electrical unit enclosure and change the power supply wirings, see Changing the power supply wirings.
Power supply wiring of the SPH20 is done via the quick connector packed separately. Wire and connect the supply voltage according to the installation instructions included in
the quick connector package. Connection is presented below.
After wiring, plug in the quick connector (see Figure 1).
QUICK CONNECTOR WIRING
+ input (+): terminals 1 and 2 input (-): terminals 3 and 4
Connect always both inputs !
electrical unit enclosure threaded nipple for barometer connection
Figure 1. Installation of SPH20.
pole quick connector two fixing screws (M6)
(not provided) upper plate lower plate threaded sleeve lower bar
Fixing screw with a washer
(included in the PTB210)
O-ring (included in the PTB210)
Figure 2. Connection of the PTB210.
PTB210
Barometer
M010016en-A
TECHNICAL DATA
Property
Materials
Plates
Bars
Connection box
Weight
Mounting
Hose connection
Electrical connections
Power supply
Description / value
Polycarbonate
Offshore Aluminium
Polycarbonate (IP65)
1360 g
2 bolts (M6 x min 20 mm) barbed fitting for 4 mm I.D.
hose or Rp1/4 thread
M12 connector
12 V (default)
24 V (with changed wiring)
Temperatures at which the heating turns ON/OFF
ON
OFF
(possibility for own heating control as well)
Power consumption during heating
Operating temperature
+4 °C (± 3°C)
+13 °C (± 3°C) about 70 W
-60 °C...+80°C
CONNECTION TO THE VAISALA PTB 210
BAROMETER (Figure 2)
1. Detach the threaded nipple and the gasket (see Figure 1).
2. Place the O-ring into the barometer groove.
3. Attach PTB210 to SPH20 with two fixing screws.
CONNECTION TO THE OTHER BAROMETERS
Connect the barometer to the threaded nipple (Figure 1) by using a plastic tube with an inner diameter of 4 mm.
MAINTENANCE
To clean the plates, blow pressurized air to the opening between the plates.
thermostat; behind the connecting board.
24V power supply terminals
12 V power supply terminals (default) connecting board
HEATING CONTROL
The thermostat controlled heating elements switch on when temperature decreases down to +4 °C (42°F). The heating switches off when temperature increases up to +13 °C (55 °F).
If an own heating control is needed, the thermostat can be shunted as follows:
1. Open the electrical enclosure cover
2. Remove the connecting board (Figure 3) by unscrewing the
3 screws.
3. Detach the wires from the thermostat.
4. Join the detached wires.
5. Replace the connecting board and close the cover.
CAUTION Surface temperature of a heated plate can be 60 °C
(140 °F) !
www.vaisala.com
Ref.
Figure 3. Connecting board.
CHANGING THE POWER SUPPLY WIRING
To change the power supply wiring from 12 V to 24 V:
1. Open the electrical unit enclosure.
2. Disconnect white and brown wires from the + terminal (12 V).
3. Disconnect blue and black wires from the - terminal (12 V).
4. Connect the white and brown wires to + terminal (24 V).
5. Connect the blue and black wires to - terminal (24 V).
DIMENSIONS (in mm)
M6
40
41
6.5
103.5
