Once the desired stop positions are determined, remove the
cotter pins holding the stops in the adjusting plate holes.
Move each stop to the desired location on the adjusting
plate and replace the cotter pins. Ensure that the float stem
is positioned between the two stops.
When determining stop positions, please note that some
stop position combinations are impossible due to the diame-
ter of the float stem. The following combinations are not
possible: Stop positions A & B, A & E, A & H, A & K,
B & C, B & K, C & D, C & K, C & L, D & L, E & F,
E & H, F & H, F & J, F & G and G & J.
1.6
Interface
Each interface unit is calibrated at the factory by precise
positioning of the calibration weight on the float stem.
Do not attempt to adjust calibration in the field. Calibration
weight should not be moved. If unit does not function
properly in interface service, consult factory.
2.0
Reference Information
This section presents an overview of the operation of the
TUFFY II Liquid Level Switches, including information on
troubleshooting common problems, maintenance proce-
dures, listings of agency approvals, lists of replacement and
recommended spare parts, and detailed physical, functional,
and performance specifications.
2.1
Description
The TUFFY II Liquid Level Switches are float actuated
devices designed for horizontal mounting in a tank or vessel
through threaded or flanged pipe connections. The compact
size allows for installation in small vessels while its many fea-
tures provide a variety of application uses. The single switch
mechanism is available in SPDT or DPDT forms on units
designed for fixed or adjustable, narrow or wide differential,
interface service and offset levels. This manual covers
TUFFY II level switches that have electric switches. For
TUFFY with a pneumatic switch, see bulletin 44-606.
44-607 Tuffy
®
II Liquid Level Switch
9
