Level Sensors

Level sensors determine how full or how empty a container is. Level sensors provide an output electrical signal at predetermined levels to communicate when to open or close control valves.


Level Sensor Types


The choice of sensors is usually determined by which substance is being measured, the environment in which the sensor is to used and in which position the sensor needs to be mounted. Some of the most common level sensors are:


Capacitive level switches


  • Capacitive level switches provide a basic full/empty level indication determined by the mounting position of the sensor. This type of switch is non-contact and uses a sensing field to determine liquid levels. Capacitive sensors provide accurate switching even with heavy residue build-up.

Vibrating level probes


  • Vibrating level probes use a rod or a fork that constantly produce high-frequency vibrations. When the vibrating probe comes into contact with the medium, the vibration changes and the vibrating level switch outputs a switching command. Vibrating level switches are used as overfill protection devices or low-level indicators in liquids as well as in granular and powder bulk solids.

Conductive level switches


  • Conductive level switches are sensors that use stainless steel probes with an electrical contact output to measure a specific liquid level. Used in conjunction with a level control relay to set and monitor each probe. Applications include ponds, reservoirs, sumps, pharmaceuticals, closed vessels and open tanks.

Ultrasonic level sensors


  • Ultrasonic level sensors generate ultrasonic sound pulses that are reflected by the surface of a liquid medium. The time travelled by the ultrasonic pulse is calculated by the sensor which then determines the distance of the liquid to give an accurate fill level. The ultrasonic sensor’s response is influenced by turbulence, pressure, moisture, and temperature.

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Description Price Device Type Mounting Type Switch Output Body Material Cable Length Minimum Operating Temperature Maximum Operating Temperature Maximum AC Voltage Maximum DC Voltage Maximum Current Maximum Pressure Gasket Material Current Rating Hazardous Area Certification
RS Stock No. 616-3028
Mfr. Part No.208995
$93.01
Each
units
Electro Optic Horizontal, Vertical - Polyethersulfone - -40°C +125°C - - 18 mA 250psi - - -
RS Stock No. 780-0302
Mfr. Part No.OLS500D3
BrandCynergy3
$48.89
Each
units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm -25°C +80°C - - 100 mA 20bar - - -
RS Stock No. 780-0175
Mfr. Part No.SSF22X100-18N
BrandCynergy3
$134.98
Each
units
Level Switch Vertical - Stainless Steel 1m -20°C +120°C - - 500 mA 10bar - - -
RS Stock No. 869-7643
Mfr. Part No.ILLS-G0100-5-003
BrandCynergy3
$452.36
Each
units
Pressure Cable 4-20mA Stainless Steel 3m -20°C +60°C - 32V 28 mA 20bar - - -
RS Stock No. 869-7652
Mfr. Part No.ILLS-G0250-5-005
BrandCynergy3
$463.50
Each
units
Pressure Cable 4-20mA Stainless Steel 5m -20°C +60°C - 32V 28 mA 20bar - - -
RS Stock No. 124-0130
Mfr. Part No.LU77-5004
BrandFlowline
$1,329.12
Each
units
Ultrasonic Level Switch Vertical - PC - -40°C +71°C 250V - 20 mA 2bar FKM 2 A -
RS Stock No. 204-6749
Mfr. Part No.003S2
BrandMobrey
$498.16
Each
units
Gap Sensor Level Alarm Switch Horizontal, Vertical Relay Polyphenylene Sulfide 3m -20°C +70°C - - 1 A 5bar - - -
RS Stock No. 407-2368
Mfr. Part No.LA9RM201
$183.19
Each
units
Electrode Cable Suspension - - - - +100°C - - - - - - -
RS Stock No. 208-7453
Mfr. Part No.B59010-D1135-B40
BrandEPCOS
$21.42
Each
units
Thermistor - - Stainless Steel - -25°C +55°C - - 45 mA 10bar - - -
RS Stock No. 387-0379
Mfr. Part No.KON66.XG3VPR
BrandVega
$638.19
Each
units
Conductive Vertical Relay Plastic - -40°C +100°C - - 1 A dc, 3 A ac 6bar - - -
RS Stock No. 493-6852
Mfr. Part No.PS61.XXAGPHKMXX
BrandVega
$4,060.30
Each
units
Radar Vertical - Plastic - -40°C +80°C - - 20 mA 2bar - - -
RS Stock No. 804-4159
Mfr. Part No.7ML1106-1BA200A
BrandSiemens
$767.25
Each
units
Ultrasonic - - - - -20°C +65°C - - - - - - -
RS Stock No. 493-7192
Mfr. Part No.7ML5221-1DB11
BrandSiemens
$1,509.20
Each
units
Ultrasonic - - PBT - -40°C +85°C - - 20 mA - - - -
RS Stock No. 493-7186
Mfr. Part No.7ML5221-1BB11
BrandSiemens
$1,763.39
Each
units
Ultrasonic - - PBT - -40°C +85°C - - 20 mA - - - -
RS Stock No. 124-0110
Mfr. Part No.DL10-01
BrandFlowline
$656.47
Each
units
Ultrasonic Level Transmitter Vertical - ABS, PC 1.2m -35°C +60°C - 24V 20 mA 2bar FKM - -
RS Stock No. 493-6830
Mfr. Part No.FX-S.61A 10M
BrandVega
$461.98
Each
units
Radar - - PBT - - - - - 20 mA 4bar - - -
RS Stock No. 794-3434
Mfr. Part No.211010A1NA
BrandRosemount
$324.39
Each
units
Fork Level Switch Side or Top Mount PNP Stainless Steel - -40°C +150°C - - 500 mA 100bar - - -
RS Stock No. 804-4109
Mfr. Part No.7MF1570-1EA01
BrandSiemens
$1,544.40
Each
units
Transmitter Cable - Stainless Steel 25m -10°C +80°C - - 20 mA - - - -
RS Stock No. 901-0299
Mfr. Part No.PS61.XXBXXHKMXX
BrandVega
$4,114.97
Each
units
Radar Sensor Panel Mount HART Polypropylene - -40°C +80°C 253V 48V 20 mA 3bar FPM 4 → 20 mA -
RS Stock No. 124-0138
Mfr. Part No.LV10-1301
BrandFlowline
$210.25
Each
units
Buoyancy Level Switch Vertical NO/NC PP 3m -40°C +90°C - - - 2bar - 250 mA -
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