1
51-638 Echotel Model 338 Two-Wire Ultrasonic Transmitter
1.0
Installation
Caution:
If equipment is used in a manner not specified by manufac-
turer, protection provided by equipment may be impaired.
1.1
Unpacking
Unpack the instrument carefully. Inspect all units for
damage. Report any concealed damage to carrier within
24 hours. Check the contents of the packing slip and
purchase order. Check and record the serial number for
future reference when ordering parts.
Caution:
Do not discard the shipping container until all parts are
checked.
1.2
Mounting and Application Considerations
Caution:
Unit should only be hand-tightened into the process con-
nection. The wrench flats should only be used when
removing the unit. Overtightening will cause transducer
errors and will void the warranty.
There are several application considerations that should be
evaluated prior to installing a non-contact ultrasonic trans-
mitter. The next few pages should be read thoroughly to
ensure that the Model 338 will perform as expected in
the given application.
Section 2.4, Measurement Range
Calculations
, provides measurement range calculations that
should be used to determine the maximum potential range
in difficult applications.
1.2.1 Position
The optimum mounting position of the Model 338 is
between
1
⁄
2
of the radius and
2
⁄
3
diameter of the (cylindrical)
tank. This will position the unit to minimize any interfer-
ence that the 5° beam (2.5° half angle) has with the tank
walls or any agitator blades that exist in the tank. Refer to
beam angle figure on page 35.
1.2.2 Orientation
The face of the transducer must be parallel to the liquid
surface within ±2° to 3°.
1.2.3 Temperature
Ensure that the transmitter will be protected against
overheating by direct sunshine. When the unit will be
subjected to severe direct sun, the use of a sunshade is
recommended.
Sunshade
