2-39
Chapter 2 Installation of this Device
2-3-4 Liquid Level Measurement Piping (JTC Model)
Warning
When doing the piping work, ensure that the connections between the connecting pipe
parts and the transmitter and three-way manifold valve are able to maintain a reliable
seal. If sealing is inadequate, there is a danger that the measured fluid will leak out and
cause scalding and other harmful health effects. If the measured fluid is harmful to the
human body, take safety measures such as wearing goggles or a mask so that it does not
adhere to the skin or the eyes, become inhaled, etc.
(1) Piping
(i) Introduction
The method for measuring the liquid level in the tank using a JTC model transmitter differs
depending on whether the tank is open or sealed. In addition, for sealed tanks, the method will be
the gas seal method (dry leg). For information on attaching this product to a process, see section
2-2-4. The piping method will now be described.
(ii) Selection of pipes
For connecting pipes from the process, select pipe schedule numbers and nominal thicknesses in
accordance with process side selection criteria (conditions such as process pressure). Diameter
1/2B, schedule number 80 steel pipes are one example of connecting pipes which are commonly
used.
(iii) Required parts example
When doing the piping work, refer to the piping example diagrams, and have the following parts on
hand. Select the rating, material, etc., of each part based on process side selection standards.
• Pipes
• Master Valve
• Unions or Flanges
• T-Joints
• Drain Valve
• Gas Vent Plugs
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