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
MYR147.14
1 Kit
Kit(s)
Electrode Chassis Mount - Phenol Resin, Stainless Steel - - - +70°C - - - - - -
RS Stock No. 185-9853
Mfr. Part No.S01DB/F68/1
MYR2,256.45
Each
units
Liquid Level Switch Side Mount SPST Aluminium Bronze - - - +210°C - - 2 A dc, 5 A ac 18bar Non Asbestos Sheet -
RS Stock No. 124-0111
Mfr. Part No.DL14-01
BrandFlowline
MYR2,193.59
Each
units
Ultrasonic Level Transmitter Vertical - ABS, PC 1.2m - -35°C +60°C - 24V 20 mA 2bar FKM 1 A
RS Stock No. 354-335
Mfr. Part No.F0301SUS201ELECTRODE
BrandOmron
MYR106.39
Each
units
Electrode Chassis Mount - Stainless Steel - - - +70°C - - - - - -
RS Stock No. 889-1330
Mfr. Part No.DL10-00
BrandFlowline
MYR2,012.43
Each
units
Ultrasonic Level Transmitter Vertical - Polycarbonate 1.2m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS Stock No. 185-9881
Mfr. Part No.S01DB/F21/1
MYR3,017.31
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. 124-0137
Mfr. Part No.LU10-1305
BrandFlowline
MYR1,818.06
Each
units
Ultrasonic Level Switch Vertical - PP 3m - -40°C +80°C - 36V - 10bar FKM 25 mA
RS Stock No. 740-6442
Mfr. Part No.LMT100
MYR1,011.00
Each
units
Electronic Flush Mount PNP NO/NC FPM, PA12, PEEK, Stainless Steel - - 0°C +60°C - - 50 mA 16bar PEEK -
RS Stock No. 377-9800
Mfr. Part No.VC5510NNOPT
MYR297.36
Each
units
Capacitance - NPN ABS, Polycarbonate 1.5m - 0°C +50°C - 30V 100 mA - - -
RS Stock No. 780-0175
Mfr. Part No.SSF22X100-18N
BrandCynergy3
MYR416.07
Each
units
Level Switch Vertical - Stainless Steel 1m - -20°C +120°C - - 500 mA 10bar - -
RS Stock No. 377-9793
Mfr. Part No.VC5510NNOP
MYR193.42
Each
units
Capacitance - NPN ABS, Polycarbonate 1.5m - 0°C +50°C - 30V 100 mA - - -
RS Stock No. 124-0112
Mfr. Part No.DL24-01
BrandFlowline
MYR2,660.12
Each
units
Ultrasonic Level Transmitter Vertical - PC 1.2m - -35°C +60°C - 24V 20 mA 2bar FKM 1 A
RS Stock No. 892-9757
Mfr. Part No.3101LP3FSCNA
MYR3,341.67
Each
units
Level Transmitter Top Mount 4-20mA Glass Filled Nylon - - -20°C +70°C - 30V 21.75 mA 3bar - -
RS Stock No. 208-7453
Mfr. Part No.B59010-D1135-B40
BrandEPCOS
MYR91.65
Each
units
Thermistor - - Stainless Steel - - -25°C +55°C - - 45 mA 10bar - -
RS Stock No. 613-3386
Mfr. Part No.SG51.XXTGATPVL
BrandVega
MYR1,550.86
Each
units
Tuning Fork Horizontal PNP Stainless Steel - - -40°C +150°C - - 20 mA 64bar - -
RS Stock No. 889-1393
Mfr. Part No.DX10-00-8FT
BrandFlowline
MYR1,881.09
Each
units
Ultrasonic Level Sensor Vertical - Polycarbonate 1.2m - -35°C +60°C - 24V 15 (Nominal) mA 30psi Viton -
RS Stock No. 498-7349
Mfr. Part No.VB61.XXAGDRKMX
BrandVega
MYR3,700.95
Each
units
Vibrating Rod Free Relay Plastic - - -50°C +150°C - - 1 A dc, 3 A ac 16bar - -
RS Stock No. 768-1956
Mfr. Part No.SONS61.EXXX
BrandVega
MYR3,724.71
Each
units
Vibrating Rod - Relay - - - - - - - 20 mA - - -
RS Stock No. 285-778
Mfr. Part No.FFAK 16 PTD 1099/L
BrandBaumer
MYR751.97
Each
units
Liquid Level Sensor Vertical/Horizontal PNP Polysulphone - - 0°C +65°C - - 200 mA 10bar - -
RS Stock No. 892-9763
Mfr. Part No.03100-1003-0002
MYR563.37
Each
units
BSP Bracket Flange Mount - - - - - - - - - - - -
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