Varec, Inc. 1
Chapter 1
Introduction
This manual is designed to assist the user with the installation, configuration, operation,
maintenance, and troubleshooting of the Varec 6700 Low Pressure Liquid Level Indicator.
Getting Started
The Varec 6700 Low Pressure Liquid Level Indicators
are for use at atmospheric pressure.
If oil-seal units are installed, pressure of 1.0 psig is
the maximum used with the 27-inch W.C. seal.
A system consists of the gaugeboard, sliding
indicator, float, cables, elbows, and the user
furnished gauge piping which carries the indicator
cable.
Proper operation of the indicator requires the
careful attention of the user to assure high quality
control during installation. Long term, satisfactory
performance of the sight gauge can thus be
obtained. If the installation quality is compromised,
sight gauge accuracy and life may be degraded.
Changes in the liquid level in the tank raise or lower
the float, which moves the indicator cable. Cable
movement drives the indicator up and down the gaugeboard on the side of the tank.
The liquid level in feet and inches, or meters, decimeters, and two-centimeter increments is
indicated by the indicator position on the gaugeboard. The user may then convert the liquid
level to units of volume. This may be accomplished manually, or Varec's computer aided data
acquisition system may perform the task.
When the indicator is at the top of the gaugeboard, the tank is empty with the float at the
bottom of the tank.
Chapter 2, Installation, covers installations to be performed on tanks that are empty and are
not in service. The section, In Service Tank Installations, covers the additional procedures that
are required for making installations on tanks that are in service.
Varec service contracts provide the user substantial savings for maintaining and refurbishing
the systems. Contact Field Service, a Varec representative or Product Marketing for further
details.
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