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 Communication Protocol Minimum Operating Temperature Maximum Operating Temperature Maximum AC Voltage Maximum DC Voltage Maximum Current Maximum Pressure Gasket Material Current Rating
RS Stock No. 354-290
Mfr. Part No.PS31SUS3041000MM
BrandOmron
PHP1,835.65
1 Kit
Kit(s)
Electrode Chassis Mount - Phenol Resin, Stainless Steel - - - +70°C - - - - - -
RS Stock No. 185-9881
Mfr. Part No.S01DB/F21/1
BrandMobrey
PHP35,201.33
Each
units
Liquid Level Switch Top Mount SPST Aluminium Bronze - - - +210°C - - 2 A dc, 5 A ac 18bar Non Asbestos Sheet -
RS Stock No. 892-9757
Mfr. Part No.3101LP3FSCNA
BrandRosemount
PHP48,881.10
Each
units
Level Transmitter Top Mount 4-20mA Glass Filled Nylon - - -20°C +70°C - 30V 21.75 mA 3bar - -
RS Stock No. 493-7192
Mfr. Part No.7ML5221-1DB11
BrandSiemens
PHP71,437.66
Each
units
Ultrasonic - - PBT - - -40°C +85°C - - 20 mA - - -
RS Stock No. 776-1604
Mfr. Part No.072.11
BrandFinder
PHP1,001.49
Each
units
Sensor Surface Mount Relay Stainless Steel 200m - 0°C +100°C - - 30 A - - -
RS Stock No. 493-7186
Mfr. Part No.7ML5221-1BB11
BrandSiemens
PHP47,105.21
Each
units
Ultrasonic - - PBT - - -40°C +85°C - - 20 mA - - -
RS Stock No. 794-3412
Mfr. Part No.211002R2NA
BrandRosemount
PHP17,394.15
Each
units
Fork Level Switch Side or Top Mount Direct Load Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
RS Stock No. 776-1623
Mfr. Part No.072.501
BrandFinder
PHP266.76
Each
units
- - - - - - - - - - - - - -
RS Stock No. 377-9872
Mfr. Part No.VN2
PHP3,165.77
Each
units
Conductive Cable - Nylon 6 2m - 0°C +90°C - - - 10bar - -
RS Stock No. 285-778
Mfr. Part No.FFAK 16 PTD 1099/L
BrandBaumer
PHP10,123.45
Each
units
Liquid Level Sensor Vertical/Horizontal PNP Polysulphone - - 0°C +65°C - - 200 mA 10bar - -
RS Stock No. 354-335
Mfr. Part No.F0301SUS201ELECTRODE
BrandOmron
PHP1,194.56
Each
units
Electrode Chassis Mount - Stainless Steel - - - +70°C - - - - - -
RS Stock No. 113-705
Mfr. Part No.7ML5430-2BA10
BrandSiemens
PHP102,409.54
Each
units
Radar Vertical - PBT - - -40°C +80°C - - 20 mA 30bar - -
RS Stock No. 613-3522
Mfr. Part No.SG51.XXSGATPV
BrandVega
PHP14,826.66
Each
units
Tuning Fork Horizontal PNP Stainless Steel - - -40°C +100°C - - 250 mA 64bar - -
RS Stock No. 204-6749
Mfr. Part No.003S2
BrandMobrey
PHP17,346.59
Each
units
Gap Sensor Level Alarm Switch Horizontal, Vertical Relay Polyphenylene Sulfide 3m - -20°C +70°C - - 1 A 5bar - -
RS Stock No. 493-6802
Mfr. Part No.SG51.XXSGBTPV
BrandVega
PHP16,560.77
Each
units
Tuning Fork Horizontal PNP Stainless Steel - - -40°C +100°C - - 250 mA 64bar - -
RS Stock No. 122-4867
Mfr. Part No.LVL-A7-AG3A-E5PU-NA
PHP12,003.55
Each
units
Limit Switch Flush Mount PNP Stainless Steel 316L 5m - -40°C +70°C - 35V 250 mA 40bar - <15 (DC-PNP) mA
RS Stock No. 889-1400
Mfr. Part No.FT10-1305
BrandFlowline
PHP13,423.74
Each
units
Liquid and Gas Flow Switch Cable - Polypropylene 3m - -40°C +60°C - 36V - 150psi Viton 1 A
RS Stock No. 377-9888
Mfr. Part No.VN3
PHP4,151.63
Each
units
Conductive Cable - Nylon 6 2m - 0°C +90°C - - - 10bar - -
RS Stock No. 794-3418
Mfr. Part No.211001A1NA
BrandRosemount
PHP9,772.21
Each
units
Fork Level Switch Side or Top Mount Direct Load Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
RS Stock No. 794-3434
Mfr. Part No.211010A1NA
BrandRosemount
PHP9,772.21
Each
units
Fork Level Switch Side or Top Mount PNP Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
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