Process Level Technology, Ltd.
MAG-GAGE
®
OPS-001 Revision 6
Page
8
of
30
December 17, 2018
Magnetic Level Gages
Installation, Operation and Maintenance Instructions
Section 2.2.0. - Level Indication
2.2.1.
INTRODUCTION
There are two types of external level indication options offered by Process Level Technology, Ltd. for magnetic
level gages. The single indicator (ST)/(SST) is recommended for stagnant storage level applications with little or
no level fluctuations. The wide flag indicator (WF)(SWF) is recommended for turbulent or high vibration level
conditions.
2.2.2. SINGLE TRACKER INDICATION (ST or SST)
The single follower assembly used for indicating level consists of a rectangular yellow magnetic follower sealed
in a channel with a 316 stainless steel calibration scale marked in feet and inches, total inches or in centimeters.
The indicator is mounted parallel and immediately adjacent to the gage chamber to allow maximum magnetic
coupling between the float and the follower within the indicator channel. The indicator is sealed to prevent dirt
and moisture accumulation. A red bumper is positioned at the bottom of the channel to cushion the impact of the
follower against the cover. Although the yellow follower provides maximum visibility even at nighttime, retrofit
kits for illuminating gages are available.
2.2.3. SINGLE TRACKER INDICATION - REFERENCE GUIDE
A black reference guide in the center of the yellow follower allows the operator to match the graduated scale with
the level of the process fluid. A nameplate at the lower end of the scale provides zero level indication. If the
yellow follower is decoupled from the internal float's magnetic field, the follower will descend below the zero
point on the scale. Thus, when the vessel is empty, the level gage will read zero and the yellow follower will
remain visible. To prevent the float from losing magnetic coupling with the follower, a spring is mounted inside
the top and bottom of the gage chamber. This cushion the impact of the float against the chamber ends when the
vessel is completely full or empty. The float and the follower are magnetically coupled when the follower remains
visible. If the magnetic coupling is lost between the float and follower, use a hand magnet to attract the follower
until it is contained within the float's magnetic field. Refer to the Troubleshooting portion of the manual, Section,
2.7.2.
