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LIQUID MANAGEMENT

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www.henrytech.com

LIQUID LEVEL SWITCHES

NPT Type

The function of a Liquid Level Switch is to detect and monitor liquid

level in a vessel.

Applications

Henry Technologies' Liquid Level Switches are designed for use in a variety

of refrigeration and industrial applications. Liquid Level Switches can be

installed in Liquid Receivers, Suction Line Accumulators, compressor

crankcases, or a variety of other applications, to detect and monitor fluid

levels.

Henry Technologies' Liquid Level Switches are suitable for use with

ammonia, HFC and HCFC refrigerants and their associated oils, as well as

other industrial fluids non-corrosive to steel and glass.

Main Features

Ÿ

Patented optical sensor technology*

Ÿ

NPT connection to liquid

Ÿ

1/2” conduit connection for wiring

Ÿ

High and Low Voltage models

Ÿ

Serviceable without refrigerant loss

Ÿ

NEMA 4 and 4X approved

Ÿ

Replacement parts available

Materials of Construction

The Level Switch Housing is made of plated steel with hermetically sealed

soda lime glass prism. The Level Switch is secured in the housing with a

plated steel retainer and sealed with a silicon O-ring.

Technical Specifications

Maximum working pressure = 1200 PSI (82.7 Bar)

Allowable operating temperature = -40°F to +200°F (-40°C to +93.3°C)

Power for Operation = 3.5 mA AC, 5.5 mA DC

Minimum Load = 2 mA (without bleed resistor)

Henry Technologies' Liquid Level Switches meet the requirements of UL 873

and UL 207 and are USR and CNR recognized by Underwriters Laboratories,

Inc.

Switch Inductive Rating = 36 VA Pilot Duty Rated

Additionally, Liquid Level Switches are CE marked in accordance with

PED.

Part No

NPT

(inch)

Fig

No

Dimensions (inch)

A (hex)

B

S-9400 Series

1/2

1

1-1/8

2.55

S-9400-1 Series

1

2

1-3/8

2.73

How it Works

The Liquid Level Switches use light reflecting from a conical glass prism as a

means of detecting the absence of a fluid at the level of the glass cone.

When no fluid covers the lower half of the cone, infrared light from the

module reflects from the mirror-like inner surface of the cone back to a light

detector signaling the electric module to switch. When fluid covers the lower

half of the glass cone, the light from the module passes into the fluid. This

absence of light is detected by the module which switches into the opposite

direction.

Installation - Notes

1. Liquid Level Switches must be installed horizontally. Switches cannot

be mounted at an angle or vertically.

2. When installed, no objects are to be within 2” of the glass prism.

3. Install Level Switches with a socket wrench to avoid glass cracking. An

open-end wrench should not be used.

4. The user must ensure the Liquid Level Switch is installed with

appropriate thread sealant for the application.

5. Wiring diagrams are included with the full instructions given in the

Product Instruction Sheet, included with each unit.

Part No

Voltage

Resistive Rating

(Amp)

Contacts with Liquid

Present

Wire color Code

Replacement

Module

S-9400

120VAC 50/60 Hz

0.5

Closed

Yellow & White

2-044-012

S-9400-1

120VAC 50/60 Hz

0.5

Closed

Yellow & White

2-044-012

S-9400A

120VAC 50/60 Hz

0.5

Open

Yellow & White/Stripe

2-044-017

S-9400A-1

120VAC 50/60 Hz

0.5

Open

Yellow & White/Stripe

2-044-017

S-9420

208/240VAC 50/60 Hz

0.25

Closed

Red & White

2-044-015

S-9420-1

208/240VAC 50/60 Hz

0.25

Closed

Red & White

2-044-015

S-9420A

208/240VAC 50/60 Hz

0.25

Open

Red & White/Stripe

2-044-018

S-9420A-1

208/240VAC 50/60 Hz

0.25

Open

Red & White/Stripe

2-044-018

S-9424

24 V AC/DC

0.5

Closed

Orange & White

2-044-013

S-9424-1

24 V AC/DC

0.5

Closed

Orange & White

2-044-013

S-9424A

24 V AC/DC

0.5

Open

Orange & White/Stripe 2-044-020

S-9424A-1

24 V AC/DC

0.5

Open

Orange & White/Stripe 2-044-020

Œ

NPT Connection



1/2” Conduit Connection

A

B

1

2

FIG 2

B

A

1

2

FIG 1

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