Installation Instructions For Temperature Sensors - Endress+Hauser EngyCal RH33 Handbuch

EngyCal® RH33
3.5

Installation instructions for temperature sensors

Fig. 14: Installation types for temperature sensors
A - B: For cables with a small cross-section, the sensor tip must reach to the piping axis or a little farther (=L).
C - D: Slanted orientation.
The immersion length of the thermometer influences the accuracy. If the immersion length is
too small, errors in the measurement are caused by heat conduction via the process connection
and the container wall. For installation in a pipe, therefore, the recommended installation depth
ideally corresponds to half of the pipe diameter.
• Installation possibilities: Pipes, tanks or other plant components
• Minimum immersion depth = 80 to 100 mm (3.15 to 3.94 in)
The immersion depth should be at least 8 times the diameter of the thermowell. Example:
Thermowell diameter 12 mm (0.47 in) x 8 = 96 mm (3.8 in). We recommend a standard
immersion depth of 120 mm (4.72 in).
• ATEX certification: Observe the installation instructions in the Ex documentation!
!
Note!
For pipes with small nominal diameters, ensure that the tip of the thermowell extends far
enough into the process so that it also protrudes past the axis of the pipe (→ å 14, item A and
B). Another solution may be diagonal installation (→ å 14, item C and D). To determine the
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