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Level Switches & Transmitters

Devices used for monitoring and controlling liquid levels in water storage tanks, reservoirs, and various industrial processes are absolutely essential to ensuring the safety and efficiency of these systems. Among these devices, level switches and level transmitters play key roles. In using liquid level switches, one would typically sense either the presence or the absence of a liquid at a specific level and then send an on/off signal to some control device when the liquid hit a defined point. Things like pumps, alarms, or other control systems could be used to "do something" when the liquid level reached that defined point. 

In contrast, we have the level transmitters, which send data to indicate the level of the liquid in a tank. These devices work well in the application of accurate level measurement in tank monitoring. They provide a nice continuous level measurement. They give an accurate measurement of the liquid in the tank, and they do it over an extended range. This is why you will find these devices used in process control, wastewater treatment, and the food and beverage industry. They give accurate measurements even in hazardous environments. They give satisfactory performance even with process fluids that are difficult to measure—like those with a range of viscosities or that have a density different from water.

Found 746 items
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Found 746 items
Manufacturer
ABB (42)
APG (41)
Dwyer (372)
Lovato (14)
Omega Engineering (161)
Tek-Trol (42)
Telemecanique (74)
Component
Bluetooth Radar Level Transmitter (1)
Borehole Submersible Level Transmitter (2)
Cable Float Switch (10)
Capacitance Sensor (16)
Capacitive Level Switch (2)
Capacitive Level Transmitter (2)
Capacitive RF Point Level Switch (1)
Chamber Type Level Control (1)
Compact Ultrasonic Transmitter (3)
Conductive Level Switch (12)
(Instrument-Sensor) Application
Bulk Solids (54)
Clean Liquids (32)
Closed Tank (53)
Condensation Pump (1)
Dirty Liquids (32)
Dry Powder (37)
Liquid (194)
Liquid Level Control (73)
Open Tank General Purpose (9)
Open Tank Heavy Duty (9)
(Instrument-Sensor) Type
1 Switch Level (29)
Bullet Nose (43)
Cable Suspended (30)
Capacitance (1)
Capacitive (2)
Dual Point (1)
Explosion-Proof (12)
Free-Floating (4)
Horizontal/Specialty (20)
Liquid (20)
Line
Square D Pumptrol (73)
Tek-Sound 4200A (6)
Tek-Sub 4800A (8)
Tek-Sub 4800C (2)
Tek-Wave 4300A (4)
Tek-Wave 4300B (1)
Tek-Wave 4300C (1)
(Instrument-Sensor) Measurement Accuracy
0.1% (16)
0.20% Of Detected Range (2)
0.25% (122)
0.25% Of Detected Range (29)
0.5% (19)
0.6% (11)
(Instrument-Sensor) Span
0.5-15' (1)
0.5-35' (4)
1.25-50' (4)
1.5-40' (2)
10 PSI (5)
10 Psig (2)
100' (1)
100 Ft (1)
11' (10)
1-19' (2)
(Instrument-Sensor) Composition
316 Stainless Steel (8)
Neoprene (9)
PVC (5)
(Instrument-Sensor) Contact Configuration
1-Normally Closed (12)
1-Normally Open (12)
1-Normally Open Or Closed (5)
2 NC (56)
2 NO (14)
NC/NO (3)
(Instrument-Sensor) For Use With
APG FT-100 Float Switches (1)
APG KA Float Switches (1)
For Closed Tank (53)
For Open Tank Or Sump (20)
Modbus Ethernet TCP-IP (3)
Modbus RTU (4)
RST-3002 Module (Sold Separately) (20)
RST-4001 Module (Sold Separately) (1)
(Instrument-Sensor) Hazardous Location Class
Class 1 Div 1 Explosion Proof (2)
Class 1 Div 1 Intrinsically Safe (20)
Class 1 Div 2 Non-Incendive (21)
Class I - Div. 1 & 2 (5)
Class I - Groups A-D (36)
Class I - Groups C And D (10)
Class II - Groups E-G (46)
(Instrument-Sensor) Indication
High Level-Alarm (17)
Low Level-Alarm (17)
With External Pointer (47)
Without (26)
(Instrument-Sensor) IP Protection
IP56 (1)
IP65 (53)
IP66 (68)
IP67 (10)
IP68 (88)
(Instrument-Sensor) Medium
Air (14)
Alcohols (3)
Alkaline Solutions (49)
Any (9)
Argon (14)
Carbon Dioxide (14)
Corrosive Fluid (73)
Dilute Acids (49)
Distilled Water (7)
Dry Bulk Solids (5)
(Instrument-Sensor) Mounting
1" NPT Male (5)
2" NPT Male (18)
3" NPT Male (6)
(Instrument-Sensor) NEMA Protection
NEMA 1 (47)
NEMA 13 (2)
NEMA 4 (82)
NEMA 4X (54)
NEMA 6 (49)
NEMA 7 (10)
NEMA 9 (10)
(Instrument-Sensor) Output Signal Range
4 - 20 Mamp (42)
(Instrument-Sensor) Output Signal Type
0-5 V 3 Wire Isolated (4)
4-20 Ma 2 Wire (Loop Powered) (68)
4-20 Ma 3 Wire Isolated (9)
4-20 Ma 3 Wire Isolated With 2 NPN Trip Points (7)
Bluetooth (1)
Modbus RS-485 (1)
RS232 (6)
RS485 (6)
RS-485 Modbus RTU (4)
RS-485 Modbus TCP-IP (3)
(Instrument-Sensor) Size
0.63" (17)
1" (11)
1.15" (4)
1.1875" (11)
19Mm (2)
3.4375" (17)
3.5" (4)
(Instrument-Sensor) Standards
CE (73)
UL 508 (73)
(Instrument-Sensor) Supply Voltage
10 - 30 VDC (13)
10-28 VDC (50)
10-30 VDC (10)
10-33 VDC (23)
110 VAC (2)
110-120 VAC (21)
115 VAC (14)
12 - 28 VDC (1)
12 - 30 VDC (1)
12 - 36 Vdc (7)
(Instrument-Sensor) Temperature Range
0 - 150°F/-18 - 66°C (10)
0 - 200°F/-18 - 93°C (47)
0 F - 130 F (8)
0 F - 150 F (8)
0 F - 176 F (11)
0 F - 200 F (9)
120°F/48.9°C (3)
122 F (29)
14 - 176°F/-10 - 80°C (32)
200°F/93°C (10)
(Instrument-Sensor) Connection Type
1/2" NPTM Fitting For Conduit With Pigtail (8)
Screw-Clamp Terminals (74)
Normally In Stock
Omega LVV-111 Vertical Buoyancy Sensor
Free U.S Ground shipping
$520.63
$433.86
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Omega LVCN210-B Ultrasonic Level Transmitter & Controller
Free U.S Ground shipping
$1041.25
$867.71
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Omega LVCN414-B Ultrasonic Level Controller for Small Tank
Free U.S Ground shipping
$833.14
$694.28
Normally In Stock
Omega LVCN414-R Ultrasonic Level Controller for Small Tank
Free U.S Ground shipping
$898.09
$748.41
Normally In Stock
Omega LVCN414-R-B Ultrasonic Level Controller for Small Tank
Free U.S Ground shipping
$803.04
$669.20
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Omega LTU-101A-G-R Tuning Fork Sensor
Free U.S Ground shipping
$675.50
$562.92
Normally In Stock
Omega LTUP-2011 Tuning Fork Point Level Switch
Free U.S Ground shipping
$934.50
$778.75
Normally In Stock
Omega LTUR-2012 Tuning Fork Point Level Switch
Free U.S Ground shipping
$1209.91
$1008.26
Normally In Stock
Omega LV803 RF Capacitance Point Level Sensor
Free U.S Ground shipping
$932.11
$776.76
Normally In Stock
Omega LVF-213A-R Optic Sensor
Free U.S Ground shipping
$678.18
$565.15
Normally In Stock
Omega LV614-N Float Level Switch
Free U.S Ground shipping
$478.51
$398.76
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Omega LV621-N Float Level Switch
Free U.S Ground shipping
$98.77
$82.31
Normally In Stock
Omega LV621-P Float Level Switch
Free U.S Ground shipping
$94.10
$78.42
Normally In Stock
Omega LVCF-111-12-ETFE Conductivity Level Switch
Free U.S Ground shipping
$762.00
$635.00
Normally In Stock
Omega LVCF-112-12-ETFE Conductivity Level Switch
Free U.S Ground shipping
$985.97
$821.64
Normally In Stock
Omega LVCN4121-12 Conductivity Level Controller
Free U.S Ground shipping
$789.18
$657.65
Normally In Stock
Omega LVCN7212 Capacitive RF Point Level Switch
Free U.S Ground shipping
$1180.37
$983.64
Normally In Stock
Omega LVCN210 ULTRA LVL CNTR W/USB CONN 9.8'
Free U.S Ground shipping
$1082.26
$901.88
Normally In Stock
Omega LVU503-G Reflective Ultrasonic Level Transmitter,
Free U.S Ground shipping
$1129.88
$941.57
Normally In Stock
Omega LVU503-B Reflective Ultrasonic Level Transmitter,
Free U.S Ground shipping
$991.80
$826.50
Normally In Stock
Omega LVU503 Reflective Ultrasonic Level Transmitter,
Free U.S Ground shipping
$1015.58
$846.32
Normally In Stock
Omega LVU501-B Reflective Ultrasonic Level Transmitter,
Free U.S Ground shipping
$768.11
$640.09
Normally In Stock
Omega LVU501 Reflective Ultrasonic Level Transmitter,
Free U.S Ground shipping
$892.61
$743.84
Normally In Stock
Omega LVCN414-V-B LEVEL XMTR VOLT/FREQ 4' RANGE
Free U.S Ground shipping
$668.56
$557.13
Normally In Stock
Omega LVCN414-V LEVEL XMTR VOLTAGE/FREQ 4'RNGE
Free U.S Ground shipping
$761.14
$634.28
Normally In Stock
Omega LVCN414-I-B LEVEL XMTR 4 RELAYS 4'RANGE
Free U.S Ground shipping
$730.28
$608.57
Normally In Stock
Omega LVCN414-I LEVEL XMTR 4 - 20 MA 4' RANGE
Free U.S Ground shipping
$778.86
$649.05
Normally In Stock
Omega LVCN414 ULTRSNC LVL TRANSM/CNTRLR CE
Free U.S Ground shipping
$885.98
$738.32
Normally In Stock
Omega LVU712-B Reflective Ultrasonic Level Transmitter,
Free U.S Ground shipping
$1713.02
$1427.52
Normally In Stock
Omega LVU712 Reflective Ultrasonic Level Transmitter,
Free U.S Ground shipping
$1796.86
$1497.38
Normally In Stock
Omega LVU706-B Reflective Ultrasonic Level Transmitter,
Free U.S Ground shipping
$1352.42
$1127.02
Normally In Stock
Omega LVU706 Reflective Ultrasonic Level Transmitter,
Free U.S Ground shipping
$1433.56
$1194.63
Normally In Stock
Omega LVCN1718 LEVEL CNTRLR 3SPDT RELAYS 18'
Free U.S Ground shipping
$1880.95
$1567.46
Normally In Stock
Omega LVCN1710 LEVEL CNTRLR 3SPDT RELAYS 10'
Free U.S Ground shipping
$1671.58
$1392.98
Normally In Stock
Omega LVU832 ULTRSNC 2-WIRE LVL TRANSM CE
Free U.S Ground shipping
$2183.00
$1819.17
Normally In Stock
Omega LVU826 ULTRSNC 2-WIRE LVL TRANSM CE
Free U.S Ground shipping
$1963.34
$1636.12
Normally In Stock
Omega LVU816 ULTRSNC 2-WIRE LVL TRANSM CE
Free U.S Ground shipping
$1745.35
$1454.46
Normally In Stock
Omega LVU809-G ULTRSNC 2-WIRE LVL XMTR CE
Free U.S Ground shipping
$1538.59
$1282.16
Normally In Stock
Omega LVU809 ULTRSNC 2-WIRE LVL XMTR CE
Free U.S Ground shipping
$1436.81
$1197.34
Normally In Stock
Omega LVU2732 ULTRA LVL XMTR W/USB CONN 32'
Free U.S Ground shipping
$1959.91
$1633.26
Normally In Stock
Omega LVU2726 ULTRA LVL XMTR W/USB CONN 26'
Free U.S Ground shipping
$1645.61
$1371.34
Normally In Stock
Omega LVU2718 ULTRA LVL XMTR W/USB CONN 18'
Free U.S Ground shipping
$1507.36
$1256.13
Normally In Stock
Omega LVU2710 ULTRA LVL XMTR W/USB CONN 10'
Free U.S Ground shipping
$1228.64
$1023.87
Normally In Stock
Omega LVSW-720 1/2" 316SS LEVEL SWITCH
Free U.S Ground shipping
$400.43
$333.69
Normally In Stock
Omega LVSW-710 1/4" 316SS LEVEL SWITCH
Free U.S Ground shipping
$402.91
$335.76
Normally In Stock
Omega LVSW-701 3/4" 316SS LEVEL SWITCH
Free U.S Ground shipping
$425.70
$354.75
Normally In Stock
Omega LVU-153-R ULTRASONIC SENSOR W/RELAY
Free U.S Ground shipping
$880.13
$733.44
Normally In Stock
Omega LVU-152-R ULTRASONIC SENSOR W/ RELAY
Free U.S Ground shipping
$640.08
$533.40

More Information about Level Switches and Transmitters

Level switches and level transmitters for liquids are nearly always fabricated from materials like stainless steel, brass, or aluminum. These sturdy devices are needed for the long term and are expected to work in even the most trying conditions found in industry. There are many options, from simple to sophisticated systems, for mounting these instruments on tanks, so not every level switch or level transmitter found in industry is necessarily cost effective. Yet, when using a level switch or transmitter makes good financial sense, the installation of either one is well justified. Accurate liquid-level measurement within any tank used in industrial processes pays dividends in just about any currency one might think to count.

Transmitters vs Transducers

Some of the most common types of transmitters and transducers can be found on pressure instruments. Examples of these include: drop-in well pressure devices and devices that measure the pressure in a pipe or gas chamber. Transmitters and transducers can also be found on flow and speed measurement devices. 

What is the difference between transmitters and transducers? 

The main difference is the way they send data to the monitoring device, like a PLC. In terms of measurement, the transmitter will reference a measuring unit by sending a milliamp signal (such as 4-20 mA). A transducer will reference a measuring unit by sending a voltage signal, typically in volts or millivolts.  

Why have the two different types of transmission methods? 

The method will depend on the application. If the electrical connection in the application travels a short distance, a pressure transducer is the better choice. Pressure transducers are smaller with fewer active electronic components that can be upset by electromagnetic interference. Also, the voltage signals transmitted over longer distances are subject to voltage drop and signal corruption. A transmitter is better for transmitting signals over a long distance.