12
REPLACEMENT PARTS
DESCRIPTION
Series 75 units with tandem style floats are used on
applications where widely spaced high and low switching
functions can be accomplished with a single control.
These units incor porate two floats which operate
independently and are arranged so that the lower float
actuates the upper switch mechanism and the upper float
actuates the lower switch mechanism. The upper float is
attached to the lower attracting sleeve by means of a
hollow stem. The lower float attaches to the upper
attracting sleeve with a solid stem which extends upward
through the upper float and stem assembly.
INSTALLATION, PREVENTATIVE
MAINTENANCE AND TROUBLE SHOOTING
Installation and maintenance of tandem float models is
accomplished in much the same manner as previously
descr ibed for standard models. Some additional
consideration must be given to the piping arrangement to
allow for alignment of the two switch actuating level marks
on the float chamber with the desired levels in the vessel.
When trouble-shooting the level sensing portion of the
control, additional checks may be made of the following :
1. Inspect for binding of solid (lower) float stem within
hollow (upper) float stem due to corrosion or possible
damage incurred in shipment.
2. Make certain that retaining “snap” rings, used to locate
lower attracting sleeve, are locked in place. An extreme
shock or hammer may have damaged a ring causing
it to snap out of its retaining groove in the hollow
(upper) float stem.
DIFFERENTIAL ADJUSTMENT
CAUTION: No differential adjustment should be made
on tandem float models in the field. Switch actuation
levels have been set at the factory to meet specific
customer specifications. Var iations in actual
conditions from design conditions usually requires
special control modifications. Consult the factory or
your local representative for assistance.
REPLACEMENT OF FLOAT AND STEM
ASSEMBLIES
Should replacement of either upper or lower float and stem
assembly be required, entire float chamber assembly
(sensing unit) should be replaced.
Item
Description
Standard Replacement Assembly Kits
B75, C75, G75, J75
1
Housing Cover (Tall)
Housing
See bulletin 42-780 for reference
2
Housing Base
Kits
switch housing replacement assemblies
3
Switch Mechanisms
-
See bulletin on mechanism furnished
(listed on Page 4)
4
Jam Nuts
5
Upper Attraction Sleeve
6
Lower Attraction Sleeve
Sleeve Kits
➀
089-3411-001 (Std.)
7
Spacer Washer
089-3412-001 (SST)
8
Retaining Ring
9
E-Tube Gasket
Gasket
012-1204-001
Nema 4X,
032-6302-037
10
Enclosing Tube
E-Tube
Nema 7/9
BASEEFA &
032-6344-001
CENELEC
11
Chamber Assembly
Sensing Unit
➁
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1
8
11
4
10
9
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6
3
2
5
NOTES:
①
Sleeve kit part numbers denote “SST” include sheathed type attraction
sleeves used on models specified for corrosive service. Standard kit part
numbers denoted “Std.” include attraction sleeves of type 400 series stainless
steel.
➁
Chamber assemblies are available as complete sensing units only with all
parts listed under items 4 through 11 assembled. See important note
following.
IMPORTANT:
When ordering, please specify:
A. Model and Serial Number of control.
B. Name and/or Number of replacement assembly.
IMPORTANT: Many model 75 controls are specially tailored to meet
specific customer specifications and therefore may contain special
parts. When ordering, always give Serial Number of control.
SERIES 75 TANDEM FLOAT UNITS
Figure 9
Summary of Contents for 075
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