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Installation 2-4 CI-9110
2.3.3 Line Size
For most installations 1/4 inch pipe or tubing is satisfactory. However, if the input or
output lines run a great distance, the response lag time may become objectionable. In these
instances the use of 3/8 inch tubing is recommended.
2.3.4 Venting
The user should note that the Remote Set Regulator bleeds a small amount of pressure into
the atmosphere during operation. A 1/4 inch NPT vent is provided on the pressure regulator
body for this purpose. The vent location is shown in Figure 2-3.
When air is used as the pressure source, the vent fitting may be allowed to bleed into the
atmosphere. If fuel gas or other hazardous type gases are used as the pressure source for a
Remote Set Regulator, the VENT port must be piped to a safe location.
** Warning **
Covers of Remote Set Regulators operating in hazardous
areas should not be removed. If servicing is required, the
environment should first be made safe or the supply power
should be turned off, allowing the instrument to be discon-
nected and removed to a safe area.
Figure 2-3 - Typical Pressure Connections
2.4 INTERNAL ACCESS
The subtopics that follow discuss the main mechanical and electrical assemblies that will
be accessed during installation. They describe the method of removing and installing the
cover, the use of the electrical conduit ports, and the installation precautions to be
observed.
2.4.1 Body and Cover
The Remote Set Regulator is contained in a aluminum body with a gasketed screw-on cover
as shown in Figure 2-2. Four raised lugs on the cover permit it to be loosened or tightened