5
INSTALLING THE EQUIPMENT
5.1
Installing The Model 6529C Evaporation Pan
The evaporation pan should be located in the centre of the compound. The
pan is installed on an open timber palette constructed from timber treated
with suitable preservatives. The pallet should be firmly bedded into the
natural surface with the top 50mm to 75mm above ground level. Do not
install the pan on a concrete, bituminous or gravel pad. It is essential that air
circulates freely beneath the pan, and that any leaks can be seen.
Rest the pan centrally on the pallet. Rotate it to orient the hole in the pan
toward the location of the stillwell assembly. Assemble the hose fittings
through the hole at the bottom of the sidewall of the pan. Seal the joints with
a smear of silicon. The assembled fitting has a hose barb on each side of the
tank wall.
Install the Model 6529-C1 level gauge. Attach the 550mm hose to the gauge
and to the inside barb in the pan wall. No hose clamps are used because
(very) small leaks will not affect operation. Position the level gauge in the
middle of the evaporation pan.
5.2
Installing The Model 6529A Enclosure
The stillwell enclosure is located 1.5 metres from the pan, on the side away
from the equator, where it will not shadow the pan. Near the equator, install it
on the western side of the pan.
Automatic Evaporation System
INSTALLING THE EQUIPMENT 19
200mm
12.5mm
hose
12.5mm hose
75mm
Point gauge assembly
in middle of pan
Refill hose from water
level control system
To water level monitoring system
Concrete the 40mm galvanised pipe firmly into the ground. Attach the
enclosure to the pole using the U-bolts supplied. Face the side with the hole
for the stillwell hose toward the pan. Move the enclosure up/down the pole
until the bottom is 20mm below the bottom of the evaporation pan.
5.3
Installing The Stillwell Assembly
Do the following:
1.
Leave the 6541 instrument off the stillwell during initial installation.
2.
Thread the 1.5 metre hose through the hole in the side facing the pan.
3.
Connect the hose to the barb fitting in the base of the stillwell. Fix it with
a hose clamp.
UNIDATA
20 INSTALLING THE EQUIPMENT
approx.
850mm
1300mm
Solar Panel
Your
padlock
Floor level 20mm
below the bottom
of the evaporation pan
Ensure the pole will not
shadow the solar panel
