How to Guide

Commercial Pressure and Float Switches for Power Circuits
Float Switches—Class 9036, 9037, and 9038
57
03/2011
© 2011 Schneider Electric
All Rights Reserved
Class 9037 Type H with Screw-in Bushing
Table 19 contains ordering information for Class 9037 Type H float switches and factory installed
modifications. Contact the Sensor Competency Center when using float switches in liquids with a
different specific gravity than water (1.0).
When ordering factory installed modifications, add the Form number to the end of the float switch
catalog number. For example, to select a 9037HG36 switch with reverse action, order 9037HG36R.
NOTE: For replacement floats, see “Class 9049 Accessories” on page 67.
9037HG35
Float on the Right
Table 19: Class 9037 Type H Float Switches
Specifications
Application
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 replacement may be necessary.
Tank Pressure
Up to 50 psi
Temperature
Ambient
Up to 220 °F
Media
Buna-N seal: up to 215 °F. Viton
®
seal: media up to 250 °F.
Contact Operation
Close on liquid rise (standard)
Open on liquid rise (Form R)
Float Travel
Determined by the float rod angle. An external pointer indicates the float position.
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 Rod Angle 45° 90° offset
Water Level Change
Minimum–Maximum, in. (mm)
2.00–5.00
(52–127)
2.50–5.00
(64–127)
3.75–7.00
(95–178)
4.25–8.25
(108–210)
6.00–11.50
(152–292)
Float Position
[1]
1
Viewed from the front of the switch, facing the indicator scale.
Left Right Left Right Left Right Left Right Left Right
NEMA Type 1
9037HG34 9037HG33 9037HG36 9037HG35 9037HG38 9037HG37 9037HG30 9037HG39 9037HG32 9037HG31
NEMA Type 4
9037HW34 9037HW33 9037HW36 9037HW35 9037HW38 9037HW37 9037HW30 9037HW39 9037HW32 9037HW31
NEMA Type 7, 9
9037HR34 9037HR33 9037HR36 9037HR35 9037HR38 9037HR37 9037HR30 9037HR39 9037HR32 9037HR31
CL to CL in. (mm)
— 3 (76) 4.25 (108) 5 (127) 7 (178)
Modifications Form
Omit 2.5 in. bushing F3
Omit float L
Reverse action: contacts open on liquid rise R
[2]
2
Type HG is field modifiable. Type HR and HW cannot be modified in the field.
Viton packing, 5 oz float (diesel fuel, Types HG, HW, HR30, 31, 32, 37, 38, 39 only) Z19
Viton packing, for media temperature up to 250 °F Z20
Viton packing, #316 SS float Z21