Level Tec Process Control

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.

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.

Optional Mounting Magnet: MM-2.00 (For 907 XP Only)

• No Drilling or Tapping Required!
• MUST be used with the EZ-100 Mounting Bracket

Features

• 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

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.

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