Bedienungsanleitung SDT43
BDA Serie SDT43 (Stand Jan. 2018)
Seite 33
3.
INSTALLING THE TRANSMITTER
The diaphragm of the transmitter is protected with a special protection cap. Protect the diaphragm
until installation takes place.
Do not damage the 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.
7.
Cut a hole in the process vessel or pipe for a precise fit of the weld-on nipple. The tolerance
is +0,2mm max.
8.
Prepare the hole by bevelling the edge to accept filler material.
9.
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 left. Allow adequate cooling
between passes. To reduce the chances of distortion to the
weld-on nipple, use a mandrel.
Determine (before welding) the position of the electronics
housing, so that the cable entry and the venting are in the right
position. After welding these positions are fixed.
10.
Position the weld-on nipple in the vessel hole and tack six places. The weld sequence is
shown in the figure above.
11.
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.
12.
Remove the mandrel after the welding operation.
3.2
INSTALLING TRANSMITTER SDT43
6.
Make sure to correctly locate the packing within the weld-on nipple.
7.
Improper installation of the packing can cause a process leak.
8.
Position the transmitter into the weld-on nipple and begin engaging threads.
9.
The transmitter can be rotated prior to seating enabling the user to optimize access to
calibration adjustments, cable entry, and local indicator.
10.
Once the Lock ring has been hand tightened, it must be tightened with an additional turn
( ± 1/8") with adjustable pliers.
3.4
MOUNTING POSITION
When the transmitter is mounted horizontally, the cable gland must be pointed downwards.
3.5
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 (1.03)
(cancel mounting position effect). This will not affect the span.
3.6
CALIBRATION
