Endress+Hauser TH53, Техническая информация, Страница: 9 / 24

TH53, TH54 and TH55
Hauser 9
Installation conditions
Orientation No restrictions.
Installation instructions
U
U
B
A
U
C
A0025312
 3 Installation examples
A-C In pipes with a small cross section the thermowell tip should reach or extend slightly past the center line of
the pipe (= U)
B Threaded, angled installation of TH53 assembly
C Flange installation of TH54 assembly
The immersion length of the thermometer influences the accuracy. If the immersion length is too
small then errors in the measurement are caused by heat conduction via the process connection and
the container wall. If installing into a pipe then the immersion length should be at least half of the
pipe diameter. A further solution could be an angled (tilted) installation (see B). When determining
the immersion length all thermometer parameters and the process to be measured must be taken
into account (e.g. flow velocity, process pressure).
• Installation possibilities: Pipes, tanks or other plant components
• Minimum immersion length per ASTM E644, ΔT ≤ 0.05 °C (0.09 °F):
For temperature assemblies with thermowell (TH53 and TH54) the minimum immersion is the
depth to which the thermowell is immersed in the medium, measured from the tip. To minimize
errors from ambient temperature the following minimum immersion lengths are recommended:
Construction Minimum immersion
Stepped thermowell 63.5 mm (2.5 in)
Tapered thermowell 114.3 mm (4.5 in)
¾" straight thermowell 101.6 mm (4 in)
Weld-in thermowell 114.3 mm (4.5 in)
TH55 assemblies can only be used in existing thermowells.
Environment
Ambient temperature range
Terminal head Temperature in °C (°F)
Without mounted head
transmitter Depends on the terminal head used and the cable gland or fieldbus connector,
see 'Terminal heads' section
With mounted head
transmitter –40 to 85 °C (–40 to 185 °F)
SIL mode (HART 7 transmitter): –40 to 70 °C (–40 to 158 °F)