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IM-P-20200627-01
3.
Installing the Transmitter
The diaphragm of the transmitter is protected
with a special protection cap. Protect the
diaphragm until installation takes place.
Take
special care with the fragile diaphragm.
3.1 Installing Weld-On Nipple
A certified welder should perform the installation of
the weld-on nipple. Weld with Argon, MIG or TIG,
with the smallest welding pin possible.
1.
Cut a hole in the process vessel or pipe for
a precise fit of the weld-on nipple. The hole
should be a tight fit when coupled with the
weld-on nipple.
2.
Prepare the hole by bevelling the edge to
accept filler material.
3.
Remove the weld-on nipple from the
transmitter.
Remove the gasket and O-Ring out of the
weld-on nipple!
WARNING
Improper installation may result in distortion
of the weld-on nipple. Excessive heat will
distort the weld-on nipple. Weld in sections
as shown in the figure below. Allow adequate
cooling between passes. To reduce the
chances of distortion to the weld-on nipple,
use a mandrel.
4.
Position the weld-on nipple in the vessel hole
and tack six places. The weld sequence is
shown in the figure above.
5.
Weld the weld-on nipple in place using 0.03
to 0.045 in. (0.762 to 1.143 mm) stainless rod
as filler material in the bevelled area. Adjust
amperage for penetration.
6.
Remove the mandrel after the welding
operation.
3.2 Installing Transmitter
(Code W33)
1.
After welding, clean up edges, and take care
of the inside nipple wall.
2.
Make sure the O-rings (10) and (11) are
properly located.
3.
Improper installation of the O-ring can cause a
process leak.
4.
Apply silicone grease to the O-ring (10),
diaphragm ring and the hole inside wall of
the weld-on nipple, this prevents galvanic cell
corrosion between transmitter and the nipple
inside.
5.
Install the transmitter and fix it with the SS M8
bolt.
3.3 Mounting Position
When the transmitter is mounted horizontally,
the cable gland must be pointed downwards.
Furthermore, 3
-
A certified units with leakage
detection holes in weld-on nipples should be on
teh lowest point and pointing down 90 degrees
fom the horizontal.
3.4 Mounting Position Effect
All transmitters are calibrated in vertical position
(diaphragm points downwards). If the transmitter
is mounted in another position, there can be a little
zero shift. (example 4,02 mA instead of 4,00 mA).
After installation of the transmitter the zero must be
set to 4,00 mA with P103 (cancel mounting position
effect). This will not affect the span.
3.5 Calibration
All transmitters are fully calibrated at the factory, to
customer specified range. If the calibration is not
specified, the transmitter will be calibrated at the
maximum span.
Determine (before welding) the position of the
electronics housing, so that the cable entry
and the venting are in the right position.
These positions are fixed after welding.
<3. Installing the Transmitter>
