Orion Instruments Atlas - Manual (Page 6)

6 46-638 Magnetic Liquid Level Indicators
1.5 Top Mount Installation
Caution: This instrument is intended for use in Installation
Category II, Pollution Degree 2 locations.
The top mount gauge can be installed as one complete
unit or disassembled to allow access from inside the tank.
Correct vertical installation is required to assure proper
float movement.
To disassemble you need only to unscrew the threaded cap
at the bottom mounting flange or connection.
Caution: Proper precautions should be taken to prevent the
bending of the guide rod.
1.6 Top/Bottom Connection Installation
Caution: This instrument is intended for use in Installation
Category II, Pollution Degree 2 locations.
Carefully unpack the MLI and stand the unit up vertically.
Note the float stop disc at the bottom flange. Note the
float stop bar (welded in place) at the top of the gauge.
This always indicates the top of gauge.
The float is shipped in the chamber.
Caution: Overall length should be ± 1 ⁄
16
". Smooth float travel must be
assured by no bending of the chamber pipe.
1.7 Start-up
Increase system pressure slowly while commissioning the
instrument. Thoroughly check for leaks, and verify that
the local indicator device accurately tracks the liquid level.
Verify external accessory devices (switches, transmitter, etc.)
are functional and properly calibrated.
Caution: Do not open the bottom isolation valve quickly. Allow the
level to rise until the MLI displays the correct level in the
vessel.