5
RTD INSTALLATION
Standard Thermowells
When installing temperature sensors in a new or drained fluid system, the IEFB uses
standard thermowells.
For accurate energy usage measurement, the temperature sensors in the inlet and
outlet must be located in ideal positions. One thermowell will be installed in the
downstream run of pipe as the IEFB (minimum of 3˝ (75 mm) and no more than 12˝
(300 mm) from the flowmeter.) The second thermowell will be placed in the return path
of the measured system.
Note:
Ensure the selected locations for the thermowells are at suitable distances given
the length of the RTD cable lengths provided.
Select the appropriate standard thermowell size for the application pipe size. 4˝ (100
mm) and 6˝ (150 mm) Standard Thermowells are available. The pipe size ranges are
listed below:
4˝ (100 mm) Standard Thermowells for 1-1/2˝ Maximum Stack Height:
4 to 7˝ (100 to 175 mm) Pipe Size
6˝ (150 mm) Standard Thermowells for 1-1/2˝ Maximum Stack Height:
8 to 36˝ (200 to 250 mm) Pipe Size
Ideal insertion depth is 3˝
Hot Tap Thermowell Sensor Depth
1. Insert the thermowell into the process collet (3) by loosening compression nut (2).
Screw into process valve (4) open the valve by turning valve handle (5).
2. Fully insert thermowell to maximum depth.
a. If thermowell makes contact with pipe ID, retract 1/4˝ (65 mm).
3. Tighten the nut (2) to 15 ft.-lbs (20.3 N m).
4. Repeat steps 1 through 3 for insertion of the second thermowell.
Note:
For best accuracy, insulate the portion of the thermowells that is outside the
pipe.
1. Cable Gland or Conduit Fitting
2. Compression Fitting
3. Process Collet
4. Valve (optional)
5. Valve handle (optional)
6. Pipe
7. Thermowell
Figure 12: Hot tap installed in pipe cross section
1
2
3
4
5
6
7
Figure 13: Stack height
5.500
MAX.
3.000
MIN.
1.500
MAX.
3.000
MIN.