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. 493-7186
Mfr. Part No.7ML5221-1BB11
BrandSiemens
$1,603.08
Each
units
Ultrasonic - - PBT - -40°C +85°C - - 20 mA - - - -
RS Stock No. 804-4109
Mfr. Part No.7MF1570-1EA01
BrandSiemens
$1,404.00
Each
units
Transmitter Cable - Stainless Steel 25m -10°C +80°C - - 20 mA - - - -
RS Stock No. 804-4140
Mfr. Part No.7ML1106-2BA200A
BrandSiemens
$835.93
Each
units
Ultrasonic - - - 10m -20°C +65°C - - - - - - -
RS Stock No. 804-4089
Mfr. Part No.7MF1570-1FA01
BrandSiemens
$1,450.30
Each
units
Transmitter Cable - Stainless Steel 25m -10°C +80°C - - 20 mA - - - -
RS Stock No. 804-4112
Mfr. Part No.7ML1201-1FE00
BrandSiemens
$1,622.83
Each
units
Ultrasonic Vertical Relay - - -40°C +60°C - - - - - - -
RS Stock No. 804-4130
Mfr. Part No.7ML1115-0CA30
BrandSiemens
$919.33
Each
units
Ultrasonic - - - - -20°C +95°C - - - - - - -
RS Stock No. 804-4159
Mfr. Part No.7ML1106-1BA200A
BrandSiemens
$697.50
Each
units
Ultrasonic - - - - -20°C +65°C - - - - - - -
RS Stock No. 804-4137
Mfr. Part No.7ML1115-3CA30
BrandSiemens
$903.39
Each
units
Ultrasonic - - - - -20°C +95°C - - - - - - -
RS Stock No. 513-2427
Mfr. Part No.7ML5610-0BD20
BrandSiemens
$316.68
Each
units
Capacitance - Relay Polyphenylene Sulfide - -40°C +85°C - - 20 mA 10bar - - -
RS Stock No. 804-3967
Mfr. Part No.7ML5735-2AA11-0AA0
BrandSiemens
$517.67
Each
units
Vibrating Level Switch Vertical Relay - - -40°C +150°C - - 8 A 10bar - - -
RS Stock No. 804-3976
Mfr. Part No.7ML5731-7AA11-1DA0
BrandSiemens
$933.88
Each
units
Vibrating Level Switch Vertical PNP Stainless Steel - -40°C +150°C - - 5 A 10bar - - -
RS Stock No. 493-7192
Mfr. Part No.7ML5221-1DB11
BrandSiemens
$1,372.00
Each
units
Ultrasonic - - PBT - -40°C +85°C - - 20 mA - - - -
RS Stock No. 113-711
Mfr. Part No.7ML5501-0EA10
BrandSiemens
$391.87
Each
units
Capacitance Vertical - Stainless Steel 1m -30°C +100°C - - 82 mA 10bar - - -
RS Stock No. 392-7841
Mfr. Part No.3UG3207-3A
BrandSiemens
$147.05
Each
units
Electrode Horizontal - - 2m - +90°C - - - 10bar PTFE - -
RS Stock No. 804-3850
Mfr. Part No.7ML5501-0EA70
BrandSiemens
$495.18
Each
units
Capacitance Switch Vertical Relay Stainless Steel - -30°C +100°C - - - 10bar - - -
RS Stock No. 463-5458
Mfr. Part No.3UG3207-1B
BrandSiemens
$139.85
Each
units
Electrode Vertical - - 2m - +90°C - - - 10bar PTFE - -
RS Stock No. 463-5470
Mfr. Part No.3UG3207-2B
BrandSiemens
$183.11
Each
units
Electrode Horizontal - - 2m - +90°C - - - 10bar PTFE - -
RS Stock No. 804-4146
Mfr. Part No.7ML1123-0CA50
BrandSiemens
$1,882.27
Each
units
Ultrasonic - - - - -40°C +95°C - - - - - - -
RS Stock No. 804-3866
Mfr. Part No.7ML5650-1BA00-0HB0
BrandSiemens
$1,372.39
Each
units
Capacitance Switch Vertical Relay Stainless Steel - -40°C +400°C - - - 35bar - - -
RS Stock No. 804-3856
Mfr. Part No.7ML5501-0JA70
BrandSiemens
$549.28
Each
units
Capacitance Switch Vertical Relay Stainless Steel - -30°C +100°C - - - 10bar - - -