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2.3.2
Pressure Systems
Open Element Type
The open element type pressure system has a pressure connection at the bottom or back of
the recorder case, Figure 2. Connect the process line to the 1/4" NPT port in the case fitting. If
necessary, a pulsation damping unit can be installed in the liquid filled process line to reduce
the effect of pulsations on the record.
Volumetric Type
The volumetric system isolates the process fluid from the
measuring element by means of a remote seal element. The
remote seal limits process contact to the surface of the seal
diaphragm. Pressure is transmitted to the recorder case through a
liquid filled tube system.
Locate the flexible connecting capillary tubing where it will not contact
extremely hot or cold surfaces. When it is necessary to fasten the tubing to
rigid supports, use staples or heavy wire. Do not drive staples so tight they
collapse tubing.
!
CAUTION
2.4
ELECTRICAL CONNECTIONS
∆
WARNING Avoid electrical shocks. AC power wiring must not be connected to the ac
All wiring connections are made to the terminal block located at the bottom of the case. Wiring
can be run through either of the 7/8" knockouts in the back or bottom of the case, Figure 2.
Check the voltage and frequency stamped on the recorder data plate before making any
connections. Make connections as indicated on the wiring diagram, Figure 5. It is
recommended that a switch be installed in the external power circuit.
! !
Do not remove protective covers from seal elements until ready to
connect them to the process.
source until all connections within the recorder have been completed
76J Pneumatic Fulscope Recorder
INSTALLATION
Wafer Style
Button Style
11
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