Schneider Square D 9036/9037/9038 Electromechanical Liquid Level Controller

Product Overview

Core Series and Positioning

9036 series: open storage tank type

Used for open containers such as water tanks and sewage pits, with lever driven float switches.

Type D: Universal

Type G: Heavy duty type

Type FG: Special switch for base type sewage pump

9037 series: Closed storage tank type

Used for pressure sealed containers, condensate pumps, diesel daily tanks, flange/thread installation.

Type E: Flange Installation

Type H: Installation of liner (2.5 inches)

9038 series: mechanical rotator

Used for alternating operation of dual pumps, starting the pumps in sequence when the liquid level rises, and triggering an alarm for ultra-high liquid level.

Type A: Open storage tank

Type C: Sealed storage tank with liner installation

Type D: Sealed storage tank with top flange installation

9049 Series: Special Accessories

Float ball, connecting rod, compensating spring, mounting plate, extension rod, etc.

General Technical Parameters

Applicable Medium

Freshwater, seawater, hydraulic oil, corrosive liquids, with a density of ≥ 0.8.

ambient temperature

-22 ° F~+220 ° F (-30 ° C~+105 ° C).

Protection level

NEMA 1: Indoor Universal

NEMA 4: Waterproof and dustproof, universal for indoor and outdoor use

NEMA 7/9: Explosion proof, suitable for Class I and Class II hazardous areas

Electrical Rating

Supports direct control of single-phase/multi-phase motors, typical:

single-phase: 2HP@115V ， 3HP@230V

Multiphase: 3HP@115V ， 5HP@230V

Control circuit: AC 600V, DC 250V

contact form 

Standard: 2 normally open (DPST)

Reverse (R): 2 normally closed (DPST)

Combination (H): 1 open and 1 closed (SPDT)

Rotation type: 4-pole (2 x DPST)

Core specifications of each series

1. 9036 open storage tank type

Drive mode: lever operation, floating ball drives connecting rod to trigger switch

Installation: Ground installation/Base installation (9049UMS1)

Features:

DG universal type, GG heavy-duty type

FG is designed for sewage pumps and cannot extend the connecting rod

Support compensating springs and support the weight of long connecting rods

Maximum connecting rod length

Top thread floating ball: 12.5ft

Center hole float: 30ft

2. 9037 closed storage tank type

Installation: Top/Side Installation

Sealing: Square sealing ring (Buna-N/Viton), with a maximum temperature resistance of 250 ° F

Pressure bearing: up to 50psi

Type E: Flange installation, liquid level changes are determined by the position of the float rod

Type H: 2.5-inch liner installation with external pointer to display float position

Can change the actuation direction on site (NEMA 1 only)

3. 9038 mechanical rotator (dual pump control)

Function:

When the liquid level reaches the first point, start pump 1;

The liquid level continues to rise → start pump 2;

Ultra high liquid level → alarm.

Optional features:

N3: Manual switch

N4: Dual non rotating

N5/N25: High water level alarm

Applicable: Dual pump condensate system, sewage lifting system

Attachment System (9049 Series)

1. Floating ball component

Top thread floating ball: short stroke, short connecting rod, 2 limit rings

Center hole float ball: long stroke, long connecting rod, 4 limit rings

Material: 304/316 stainless steel, plastic

2. Connecting rod (pipe material)

Material: brass, aluminum, stainless steel

Standard length: 5ft, can be extended by 2.5ft

Heavy duty connecting rods require compensating springs

3. Other key attachments

Compensation spring: supports the weight of the long connecting rod

9049UMS1: Universal mounting base

Connecting rod extension kit, replacement float, seals

Key selection points

Select series by tank type

Open/sewage pit: 9036

Sealed/condensing pump: 9037

Dual pump rotation: 9038

Select model based on protection

Indoor drying: G ending (NEMA 1)

Indoor and outdoor humidity: W ending (NEMA 4)

Explosion proof hazardous area: End of R (NEMA 7/9)

Select suffix by action

Standard: Liquid level rise → Contact closure

R: The liquid level rises → the contact opens

Floating ball and connecting rod calculation

The buoyancy must be greater than the total weight of the connecting rod and limit ring, and a compensating spring must be added to the long connecting rod.

Application scenarios

Water supply and drainage: water tank, sewage pit, condensate water system

Industry: hydraulic station, lubricating oil tank, corrosive liquid storage tank

HVAC: Condenser pump unit, dual pump rotation control

Explosion proof area: hazardous environment liquid level control