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. 889-1340
Mfr. Part No.DL14-00
BrandFlowline
MYR2,324.14
Each
units
Multi Function Ultrasonic Transmitter Vertical Relay Polycarbonate 1.2m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS Stock No. 768-1956
Mfr. Part No.SONS61.EXXX
BrandVega
MYR3,724.71
Each
units
Vibrating Rod - Relay - - - - - - - 20 mA - - -
RS Stock No. 906-9632
Mfr. Part No.OLS-10
MYR612.29
Each
units
Level Switch Horizontal, Vertical NPN Polysulfone, Stainless Steel 38in - - +79.4°C - 28V 100 mA 69bar - 35 mA
RS Stock No. 185-9869
Mfr. Part No.S01DB/F68/4
BrandMobrey
MYR2,770.71
Each
units
Liquid Level Switch Side Mount SPST Aluminium Bronze - - - +210°C - - 2 A dc, 3 A ac 18bar Non Asbestos Sheet -
RS Stock No. 285-778
Mfr. Part No.FFAK 16 PTD 1099/L
BrandBaumer
MYR867.74
Each
units
Liquid Level Sensor Vertical/Horizontal PNP Polysulphone - - 0°C +65°C - - 200 mA 10bar - -
RS Stock No. 204-6733
Mfr. Part No.003H2
BrandMobrey
MYR1,552.18
Each
units
Gap Sensor Level Alarm Switch Horizontal, Vertical FET Polyphenylene Sulfide 3m - -40°C +105°C - - 100 mA 5bar - -
RS Stock No. 793-2812
Mfr. Part No.MHF15-21NG1PSM
BrandSick
MYR549.27
Each
units
Optical Sensor Chassis Mount PNP Stainless Steel - - -25°C +55°C - - 100 mA 16bar - -
RS Stock No. 488-037
Mfr. Part No.LR7000
MYR1,702.00
Each
units
- - PNP Stainless Steel/FKM/NBR/PB/PC/PEI/TPE/PTFE - - 0°C +60°C - - 200 mA 4bar - -
RS Stock No. 869-7696
Mfr. Part No.ILSE-G0700-5
BrandCynergy3
MYR1,059.18
Each
units
Pressure Chassis Mount 4-20mA Stainless Steel - - - - - 32V 28 mA 50bar - -
RS Stock No. 776-1610
Mfr. Part No.072.53
BrandFinder
MYR307.46
Each
units
- - - - - - - - - - - - - -
RS Stock No. 889-1356
Mfr. Part No.DL14-11
BrandFlowline
MYR2,614.71
Each
units
Multi Function Ultrasonic Transmitter Vertical Relay Polycarbonate 1.2m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS Stock No. 124-0142
Mfr. Part No.LO10-1305
BrandFlowline
MYR905.23
Each
units
Flowline Detection Switch Vertical NO/NC PP 3m - -40°C +80°C - 36V - 10bar FKM 25 mA
RS Stock No. 122-8416
Mfr. Part No.090-0024
MYR634.94
Each
units
Level Switch Side - Brass 1m - -40°C +100°C - - - 16bar - -
RS Stock No. 204-6749
Mfr. Part No.003S2
BrandMobrey
MYR1,486.88
Each
units
Gap Sensor Level Alarm Switch Horizontal, Vertical Relay Polyphenylene Sulfide 3m - -20°C +70°C - - 1 A 5bar - -
RS Stock No. 869-7699
Mfr. Part No.ILSE-G1000-5
BrandCynergy3
MYR1,059.18
Each
units
Pressure Chassis Mount 4-20mA Stainless Steel - - - - - 32V 28 mA 50bar - -
RS Stock No. 776-1601
Mfr. Part No.072.02.06
BrandFinder
MYR70.85
Each
units
Electrode Vertical Relay Stainless Steel 6m - 0°C +100°C - - - - - -
RS Stock No. 768-2072
Mfr. Part No.TRENN149AEX.X
BrandVega
MYR1,335.46
Each
units
Sensor DIN Rail - - - - - - - - 20 mA - - -
RS Stock No. 906-8018
Mfr. Part No.01755
MYR467.75
Each
units
Level Switch Vertical SPST NO Stainless Steel 24in - -40°C +148.9°C - - - 275psi - -
RS Stock No. 493-7186
Mfr. Part No.7ML5221-1BB11
BrandSiemens
MYR5,237.24
Each
units
Ultrasonic - - PBT - - -40°C +85°C - - 20 mA - - -
RS Stock No. 122-8417
Mfr. Part No.010-3463
MYR1,314.05
Each
units
Level Switch Horizontal SPDT Brass - - -40°C +80°C - - - 10bar - -
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