ABB SensyMaster FMT230 Commissioning Instruction page 36

36 FMT230, FMT250 THERMAL MASS FLOWMETER | CI/FMT230/250-EN REV. B
... 6 Installation
... Assembly of the welding adapter with hot tap fitting
Calculation of the installation length X and installation depth Y
X =
( )
Y = D −
/ 2
X Outside length of the integrated changing device
Y Installation depth of the integrated changing device
h Sensor length
D Outside diameter of the pipeline
Example
• Sensor length h = 425 mm (16.73 in)
• Pipe with outside diameter of 210 mm (8.27 in)
• The hot tap fitting is in measurement position
X = 425 mm − (210 mm / 2) = 320 mm
Y = (210 mm / 2) − 28 mm = 77 mm
Consider the following points when installing the welding
version in the piping:
• Maintain a right angle to the pipe axis (max. tolerance 2°).
• The adapter centering pin must be aligned with the pipe
axis in the flow direction (outflow side, behind the
measuring point).
NOTE
Damage to components
If the welded joints become hot, warping of the sealing
surfaces and / or damage to the O-rings can occur.
• Pause occasionally to allow the fitting to cool.
NOTE
Impact on measuring accuracy
Deviations from the stated dimension and position tolerances
have an impact on measuring accuracy.
( )
h − D
2 /
mm inch
28 1 ( 1 . )