How to Guide

Commercial Pressure and Float Switches for Power Circuits

Float Switches—Class 9036, 9037, and 9038

03/2011

Class 9037 Closed Tank

Type E

The Class 9037 Type E switches are flange mounted. Float movement is transmitted through a quad

ring seal. Each switch consists of a basic switch, float rod, and float. The switch can be configured in

the field for contacts that open on liquid rise or close on liquid rise. These switches are used for top

mounted or side mounted, closed tank applications.

Type H

The Class 9037 Type H switches are attached to the tank by means of a 2-1/2 in. bushing. An external

pointer indicates the float position within the tank when the unit is mounted. Switches come complete

with stainless steel float and rod. A nitrile rubber seal, such as a Buna-N quad ring seal, is used

between the float rod and the sealing connector. Normal application is at atmospheric pressure. Where

higher pressures are encountered, the available Viton

seal allows the switch to withstand tank

pressures up to 50 psi at ambient temperatures up to 220 °F. Occasional replacement of the quad ring

seal may be necessary.

Class 9038 Mechanical Alternators

Type A (Open Tank)

The Class 9038 Type A Open Tank level switch is a mechanical alternator designed to provide motor

alternation in the operation of two motors.

Type C (Closed Tank, Bushing Mounted)

The Class 9038 Type C Closed Tank level switches are bushing mounted. Float movement is

transmitted through a quad ring seal. Each switch consists of a basic switch, rod, and float.

Type C switches are attached to the tank by means of a 2-1/2 in. bushing. An external pointer indicates

the float position within the tank when the unit is mounted. Switches come complete with bushing,

stainless steel float, and rod.

Occasional replacement of the quad ring may be necessary.

Type D (Closed Tank, Flange Mounted, Top)

Type D mechanical alternators are designed for applications where flange mounting is to be made at

the top of a closed tank.

9037E

9037H

9038AG1

9038CG

9038DG

9049ER5

9049EF1