How to Guide

Commercial Pressure and Float Switches for Power Circuits
Float Switches—Class 9036, 9037, and 9038
61
03/2011
© 2011 Schneider Electric
All Rights Reserved
Class 9038 Type C Mechanical Alternators with Bushing
Table 24 contains ordering information for Class 9038 Type C mechanical alternators. Contact the
Sensor Competency Center when using Class 9038 alternators in liquids with a different specific
gravity than water (1.0).
When ordering a factory modification, add the Form number to the end of the alternator catalog
number. For example, to select a 9038CG36 alternator with reverse action, select 9038CG36R.
NOTE: For replacement floats, refer to page 67.
Table 24: Class 9038 Type C Mechanical Alternators
Specifications
Application
Closed tanks using duplex, condensate pumps
A 2.5 in. cast iron bushing attaches the float switch to the tank
Float movement
Transmitted through a nitrile rubber seal such as a Buna-N quad ring.
Occasional seal replacement may be necessary.
Tank Pressure Up to 50 psi
Ambient Temperature –22 to +200 °F
Media Temperature (Minimum) Solidification point of the medium in the tank, down to –22 °F
Contact Operation
Close on liquid rise (standard)
Open on liquid rise (Form R)
Float Travel
Float travel is determined by the rod length.
An external pointer indicates the float position.
For more information on float travel and position, see “Float Travel” on page 64.
Materials (Standard)
#304 SS float, #316 SS rod, 2.5 in. cast iron bushing, brass sealing connector,
Buna-N quad ring packing
Catalog Numbers
Float Position
[1]
1
Viewed from front of alternator, facing indicator scale.
Left Right
Water Level Change,
Minimum–Maximum
in.
(mm)
6.5–13
(165–330)
4–7.75
(102–197)
4.75–9.25
(121–235)
6.5–13
(165–330)
4–7.75
(102–197)
4.75–9.25
(121–235)
NEMA 1 9038CG32 9038CG34 9038CG36 9038CG31 9038CG33 9038CG35
NEMA 4 9038CW32 9038CW34 9038CW36 9038CW31 9038CW33 9038CW35
NEMA 7, 9 9038CR32 9038CR34 9038CW36 9038CR31 9038CR33 9038CW35
Modifications Form
Omit 2.5 in. cast iron bushing F3
Omit float L
Two-level, non-alternating unit N4
[2]
2
Factory installed only.
High water alarm circuit, single pole (Type CG only) N5
[2]
High water alarm circuit, two pole (Type CG only) N25
[2]
Reverse action: contacts open on liquid rise R
[2]
Fluorocarbon polymer such as Viton
®
packing, 5 oz float (diesel fuel, Type CG only) Z19
Fluorocarbon polymer such as Viton packing, for media temperature up to 250 °FZ20
Fluorocarbon polymer such as Viton packing, #316 SS float for liquid temperatures
up to 250 °F
Z21
9038CG36
Front
Float on the left