Level Tec Process Control

The 1101 Hall Effect sensor has a non-threaded stainless steel body, is supplied with a mounting bracket and 10 ft of 3-conductor shielded cable. It is commonly used with pulser discs or 60 pulse/rev magnet wheels.

These speed sensors use magnet-sensing Hall Effect IC's to produce a digital pulse signal to interface with speed switches, tachometers, counters, signal conditioners, or PLC's. Hall Effect sensors provide true zero speed operation with square-wave output and immunity to electrical noise.

A pulser disc or split collar pulser wrap with embedded magnets is mounted on the monitored shaft. As the shaft rotates, the magnets pass in front of the sensor causing the sensor to switch high and low, thus producing a digital pulse output. The sensors provide a digital square wave signal with a 50/50 duty cycle when used with pulse generators that have evenly spaced magnets of alternating polarity, such as Electro-Sensors Model 255 Pulser Disc. The recommended gap distance between the sensor and pulse generator is 1/4 inch +/- 1/8 inch. The gap flexibility makes the sensors tolerant of vibration, shaft run-out, misalignment, and industrial environments.

•   NPN open collector, square-wave output
•   Zero speed operation with no signal loss
•   Non-contact, large gap distance sensing 
•   Signal transmits up to 1,500 ft 
•   Simple to install and set up
•   Powered by 5-24 VDC

Square wave pulse frequency output, NPN/PNP (open collector or terminated) output options with single channel and bi-directional (quadrature) both signal options.
Hall effect and Magnetoresistive sensing options with wide temperature option.

Building a Model Number

• Housing:
  - Basic Corded
  - M12 Eurofast Connector
  - ½ NPT Female Conduit Port
  - ½ Flex Liquid-Tight Conduit Fitting
• Sensing (Hall Effect, Magnetoresistive)
• Signal (Single or Quadrature)
• Output (NPN or PNP)
• Termination (Open-Collector or Terminated)
• Cable length
• Temperature (Standard or Wide Temperature)
• FM Approved Intrinsically Safe (IS) Class I, Div 1, A → D; Class II Div 1 E→G; Class III A Ex / Ex ia II c
• NEMA 4X, IP 65

The patented ST420-LT and ST420-DI detect passing magnets of a shaft-mounted pulser disc or wrap and output a smooth, continuous 4-20 mA analog signal in direct proportion to shaft rotation speed.
ST420-LT                    Integral ½ in flexible liquid-tight conduit fitting
ST420-DI                    Integral ½ NPT female conduit port


  • 2-wire, loop-powered 4-20 mA analog output
  • No user calibration: works right out of the box
  • Works with shaft-mounted pulser targets (disc/wrap)
  • Rugged stainless steel M18x1 housing with integral conduit attachment
  • Reverse-wiring protected
  • FM approved, Dust-Ignition-Proof Class II, Div I (E, F, G)
  • NEMA 4X, IP65

Magnetoresistive sensors are used with magnetic targets such as Pulser Wraps, Pulser Discs, or 60 Pole Pair Magnet Wheels to provide digital pulse output signals. These sensors are also used in applications where only one magnet is present for counting, function start/stop, or orientation alignment of mechanical or electronic indexing equipment.

1102 (Stainless Steel)
The 1102 is 7/16 inch in diameter, non-threaded stainless steel, and is 2 inches in length. It is supplied with a mounting bracket and 10 feet of 3-conductor shielded cable.

932 (Aluminum)
The 932 is 3/4 inch in diameter, with 3/4-16 UNF threads, and is 2-1/2 inches in length. It is supplied complete with a mounting bracket, jam nuts, and 10 feet of 3-conductor shielded cable. It can also be supplied with a conduit adapter allowing it to fit a 3/4 inch conduit fitting.

933 XP (Explosion Proof)
• Class I, Div I (C, D) Class II, Div I (E, F, G) Class III
• XLB-1 enclosure
The 933 XP is mounted in a cast aluminum enclosure. The conduit opening is 1/2 inch NPT. It comes complete with 10 feet of 03 wire shielded cable, and a mounting bracket.

The Electro-Sensors HE950 gear tooth sensor monitors gear teeth and other ferrous metal targets. The HE950 gear tooth sensor produces digital pulse signals for use with speed switches, tachometers, counters, signal conditioners, or as a direct pulse input into programmable controllers (PLCs). It incorporates a dual Hall Effect sensor and signal processing that switches in response to differential magnetic signals created by a ferrous target. Typical targets are gear teeth, keyways, or bolt heads, and the circuitry achieves true zero-speed operation down to zero Hz. Each sensor is entirely solid state with no moving parts to wear out, providing a low maintenance rugged and long-lasting sensor.

The HE950 sensors are powered by 5-24 VDC, provide an NPN open collector output and can be mounted up to 1,500 feet from the control unit. The standard HE950 sensor has a threaded aluminum, NEMA 4 housing and is supplied with an adjustable, plated-steel mounting bracket and 10 feet of 3-conductor shielded cable.

  • Senses broad range of ferrous target sizes
  • Senses a frequency range up to 12 kHz
  • Applications include Gear Tooth, Keyway, and Bolt Head Sensing
  • Full output down to zero Hz
  • Rugged, NEMA 4 sensor housing
  • Available with 3/4in or 18mm threads
  • 5-24 VDC Powered

The patented ST420 detects passing magnets of a shaft-mounted pulser disc or wrap and outputs a smooth, continuous 4-20 mA analog signal in direct proportion to shaft rotation speed.

  • 2-wire, loop-powered 4-20 mA analog output
  • No user calibration: works right out of the box
  • Works with shaft-mounted pulser targets (disc/wrap)
  • Rugged stainless steel M18x1 housing
  • Reverse-wiring protected
  • UL listed, Intrinsically Safe (IS) 
  • Class I, Div I (C, D) Class II, Div I (E, F, G) when used with an IS barrier

Custom speed and pulser disc/wrap PPR ST420 models are available upon request.

907 XP sensors are used in applications requiring hazardous location ratings, or in applications where the sensor may be subject to abuse. It has a 1-inch NPT conduit opening for wiring, terminal strip for wiring, and is provided with a mounting bracket and 10 ft of cable. The quadrature (bidirectional) option has two sensors and is designed for applications requiring both speed and direction information. Specify vertical alignment when the magnets will pass vertically in front of the sensor face, and horizontal alignment when the magnets will pass horizontally in front of the sensor face.

These speed sensors use magnet-sensing Hall Effect IC's to produce a digital pulse signal to interface with speed switches, tachometers, counters, signal conditioners, or PLC's. Hall Effect sensors provide true zero speed operation with square-wave output and immunity to electrical noise.

A pulser disc or split collar pulser wrap with embedded magnets is mounted on the monitored shaft. As the shaft rotates, the magnets pass in front of the sensor causing the sensor to switch high and low, thus producing a digital pulse output. The sensors provide a digital square wave signal with a 50/50 duty cycle when used with pulse generators that have evenly spaced magnets of alternating polarity, such as Electro-Sensors Model 255 Pulser Disc. The recommended gap distance between the sensor and pulse generator is 1/4 inch +/- 1/8 inch. The gap flexibility makes the sensors tolerant of vibration, shaft run-out, misalignment, and industrial environments.

• Square-Wave Pulse Frequency Output, NPN Open-Collector
• Zero Speed Operation with No Signal Loss
• 5-24 VDC Powered
• Non-Contact, Large Gap Distance Sensing
• Bidirectional (Quadrature) Option
• Works with Electro-Sensors Magnetic Pulser Discs/Wraps
• Optional Mounting Bracket Assembly and Mounting Magnet
• Class I, Div I (D) Class II, Div I (E, F, G) Class III
• XLB-3 Enclosure

Model 906 sensors are water resistant and suitable for industrial applications, including environments where dirt, dust, grease, or moisture are present. The 906 standard sensor has a threaded aluminum body, and is supplied with a mounting bracket and 10 ft of cable. The quadrature (bidirectional) option has two sensors and is designed for applications requiring both speed and direction information.

These speed sensors use magnet-sensing Hall Effect IC's to produce a digital pulse signal to interface with speed switches, tachometers, counters, signal conditioners, or PLC's. Hall Effect sensors provide true zero speed operation with square-wave output and immunity to electrical noise.

A pulser disc or split collar pulser wrap with embedded magnets is mounted on the monitored shaft. As the shaft rotates, the magnets pass in front of the sensor causing the sensor to switch high and low, thus producing a digital pulse output. The sensors provide a digital square wave signal with a 50/50 duty cycle when used with pulse generators that have evenly spaced magnets of alternating polarity, such as Electro-Sensors Model 255 Pulser Disc. The recommended gap distance between the sensor and pulse generator is 1/4 inch +/- 1/8 inch. The gap flexibility makes the sensors tolerant of vibration, shaft run-out, misalignment, and industrial environments.

• Square-Wave Pulse Frequency Output, NPN Open-Collector
• Zero Speed Operation with No Signal Loss
• 5-24 VDC Powered
• Non-Contact, Large Gap Distance Sensing
• Simple to Install and Set Up
• Bidirectional (Quadrature) Options
• Works with Electro-Sensors Magnetic Pulser Discs / Wraps
• Optional Mounting Bracket Assembly and Mounting Magnet

The Electro-Sensors FB420 2.0 speed sensor provides a 4-20 mA signal directly proportional to the rotational speed of a monitored shaft and has a 4 digit LCD display capable of displaying from 0.000 to 9,999 rpm or from 4 to 20 mA, the display is also used for calibration and trouble-shooting. The sensor has one relay that can be programmed for failsafe over-speed alarm or failsafe under-speed alarm. The 2.0 version of the FB420 has built-in testing functionality.  The under-speed test allows the user to test for slowdowns, this allows the user to test for system warnings and shutdowns. The FB420 is used to monitor shaft speed on equipment that includes: belt conveyors, drag conveyors, bucket elevators, fans, blowers, crushers, and pumps.


  • FB420 2.0 includes onboard sensor testing
  • Self-contained system with built-in speed sensor and relay switch
  • Relay can be set for over-speed or under-speed
  • Housing is explosion proof and water resistant
  • 4-20 mA output directly proportional to shaft speed
  • Provides real-time preventive maintenance feedback
  • Class I, Div I (C, D) Class II (E, F, G)

The Traction Wheel Encoder Assembly consists of a rotary shaft encoder, the traction wheel, the mounting bracket hinge clamp assembly, and the mating connector. There are three models of traction wheels: black neoprene rubber, smooth polyurethane, and diamond knurled aluminum tread.

The traction wheel rides directly on the material being monitored and is ideal for slow speed applications. The wheel is connected to a rotary shaft encoder, which is supported by the mounting bracket. The encoder then generates a digital pulse frequency based on the number of pulses per revolution and the speed of the traction wheel. This digital signal is sent via the mating connector to a counter, ratemeter, or other control equipment.

• A complete ready-to-install system
• 1 to 1,270 pulses per revolution
• Optional Bi-Directional models
• Double traction wheel assembly
• Specify pulses per revolution when ordering

We provide reliable solution to industrial automation needs.
In the business for nearly a decade the people here have mastered the art of catering to level sensing needs of the industry with high degree of precision and accuracy and that too at very low cost.