Level Sensors & Switches

ELS-950M Single-Point Level Switch

Part Number: 232173
Image is of similar product


ELS-950M Series Single-Point Level Switch is ideal for industrial OEMs requiring a solid-state sensor for small space and high temperature environments. The UL approved design features a rugged brass housing, a TPE over-molded electronics insert, TPE insulated wires, and flourocarbon o-ring seals that create a watertight, environmentally resistant assembly, suited for use in harsh environments.

  • Rugged brass housing
  • Smallest Size
  • TPE Over-Molded Electronics
  • Durable Enough to Handle Harsh Environments


  • Rugged brass housing
  • Smallest Size
  • TPE Over-Molded Electronics
  • Durable Enough to Handle Harsh Environments 
Sensor Type
Primary Material Of Construction
Wetted Materials
Glass, Brass
Stem Material
Float Material
Float Diameter
Actuation Level
Min. Liquid SG
Maximum Pressure
250 psi
Minimum Temperature
Maximum Temperature
Mounting Size
Mounting Style
Vertical or Horizontal
Electrical Termination
78" Long, 22 AWG, TPE Leads
Switch Type
TTL/CMOS Compatible
Switch Operation
Normally Open (Non-Reversible)
12 VDC
Sink 40 mA max, up to 30 VDC

Gems Sensors Instructions, ELS-950M

Format .pdf
Size 28 KB

Electro-Optic Level Switch Product Guide

Format .pdf
Size 148 KB

Gems Sensors Catalog, ELS-950M

Format .pdf
Size 216 KB
  • General Industry
  • General Industry - Alarm Panels
  • General Industry - Appliance
  • General Industry - Car Wash Equipment
  • General Industry - Chemical Metering/Injection
  • General Industry - Cleaning Equipment
  • General Industry - Compressors
  • General Industry - Fountains
  • General Industry - Fuel - Handling
  • General Industry - Hydraulics
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  • General Industry - Machine Tool
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  • General Industry - Maintenance Equipment
  • General Industry - Other
  • General Industry - Plasma Cutting
  • General Industry - Printing - 3D
  • General Industry - Printing Equipment
  • General Industry - Skid Manufacturer
  • General Industry - Test & Measurement
  • General Industry - Test Stands/Systems
  • General Industry - Welders
  • HVAC/R - Air Conditioning Systems
  • Medical - Analytical Instruments
  • Medical - Dermatology
  • Medical - Imaging
  • Medical - Immunochemistry
  • Medical - IVD
  • Medical - Lab
  • Medical - Laboratory & Testing
  • Medical - Life Sciences
  • Medical - Medical Lasers
  • Medical - Other
  • Medical - Radiology
  • Medical - Renal Care / Dialysis
  • Medical - Respiratory Equipment
  • Medical Equipment
  • Off Highway Vehicles
  • OHV - Agricultural Equipment
  • OHV - Highway Construction Equipment
  • OHV - Industrial Equipment
  • OHV - Lawn Equipment
  • OHV - Material Handling
  • OHV - Military Vehicles
  • OHV - Mining Equipment
  • OHV - Other
  • OHV - Recreational Vehicles
  • OHV - Specialty Equipment
  • Oil & Gas - Analytical Equipment
  • Oil & Gas - Compressed/Liquified Nat. Gas
  • Oil & Gas - Drilling Equipment
  • Power Gen Equipment
  • Power Generation - Fuel Cell
  • Power Generation - Generators
  • Power Generation - Other
  • Printers
  • Specialty Vehicles
Will different liquid media affect the time delay for optic sensors?

If the viscosity is similar, the time delay should be the same for different media.

What is the difference between "sinking" and "sourcing?"

Sinking and sourcing are terms used to describe how an associated load (the device being turned on or off by the sensor) is powered in relation to the sensor. Sinking, the more widely used of the two, involves the switching of load current (power) supplied by a power source external to the sensor. In a sinking configuration, current passes through the load first, through the output switch of the sensor second and lastly to ground. A sensor with a sinking output switches the ground, or negative, leg of the circuit. In contrast, sourcing refers to a configuration in which the sensor is the source of the current required to power the load. In a sourcing situation, current supplied by the sensor passes through the load second and then to ground. A sensor with a sourcing output switches the positive leg of the circuit.

Can you connect more than one 12 volt Sinking Electro Optic Sensor to the Opto Pak Controller?

The Opto-Pak controller was designed for just one relay output. However, when using 12 VDC Electro Optics in parallel with one Opto-Pak controller Part# 149536 or 149535 with Nema4X Enclosure, the following is possible: Maximum capability: 100Ma Maximum optic sensors: 4 For multiple sensors wired in parallel to one Opto pak Controller, the sensors will exhibit logical OR operation: Dry Sink sensors: if any sensor is dry, the Opto Pak Controller relay will be energized, and all sensors would have to be wet to de-energize the relay. Wet Sink sensors: if any sensor is wet, the Opto Pak Controller relay will be energized, and all sensors would have to be dry to de-energize the relay.

Does Gems offer an optic sensor with a time delay?

For large volume OEM applications, a custom time delay is available on the programmable microprocessor version of the ELS-1150, which can be programmed for on, off or both delays from 2 seconds to 255 seconds. All delays have a ±1 second tolerance. Call Gems for more information.

Is there a preferred mounting position for the ELS-1150 and ELS-1150XP Optical sensor?

These sensors must be mounted horizontally or up to 45 degrees from horizontal only. Reason, possible drips on tip can cause false indication. Also do not want to create air pockets.

What is the diode part number that is referenced for inductive loads per the wiring diagram for an Optic sensor?

Reference Diode part# 1N4004, (400V peak input voltage)