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Speed Sensors &
Tachometers
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AI-Tek (formerly AIRPAX) Tachometers
AITek (formerly AIRPAX) Speed Sensors
Principles of Operation
Available from Automatic Controls Inc. secure online catalog
Principles of Operation
The internal construction of the typical Al-Tek variable reluctance sensor is a magnet, pole piece and coil (See figure 1). A magnetic field (lines of flux) extends from the magnet, through the pole piece and coil out into the air space at the end of the sensor. The return path of the magnetic field is from the air space to the other end of the magnet. As a ferrous object approaches the tip of the pole piece, the magnetic field increases and then decreases as the object moves away from the pole piece. The snap or the rapid change in the magnetic field induces an AC voltage signal in the coil. With an ideal target and matching sensor, the induced voltage is in the shape of a sine wave.
As can be seen, the generated frequency signal is directly proportional to the number of ferrous objects passing the pole piece per unit time. The amplitude of the voltage output is proportional to the speed of the ferrous objects passing the pole piece.
Many applications of Al-Tek magnetic sensors use gears as targets. Typical sensor output wave forms with various targets are illustrated in Figure 3. Testing sensors with gears rather than other ferrous discontinuities such as sprockets, keyways, boltheads, etc. is because the output is predictable and repeatable. See Figure 2 for commonly used gear terminology.
Diametral Pitch = No. of Teeth + 2
Outside Dia. of Gear (in.)
Trust Tachometers...Because your time is of the essence
AI-Tek Instruments offers fast response and high-precision tachometers for monitoring and protection. Field programming allows easy installation and upgrading, while minimizing part number variations. Options include 0-20mAdc, 4-20mAdc, -20 to 0 to +20mAdc output, 5-digit display, RS485, 2 solid state relays, 2 mechanical relays, with standard, NEMA 4x or explosion proof enclosures.
SENSORS
Delivering Quality, Dependable Products in the Nick of Time
AI-Tek Instruments (formerly Airpax ®) has been supplying magnetic speed sensors for fifty years to the industrial, machine tool, petrochemical and aerospace industries.
Speed, Side Look, Hall, Bi-Directional Sensors
Offering Speed Sensor Technology & Fast, Timely Service
Zero Speed
Digital Signal
Standard or Custom Design
UL/CSA Listed for Hazardous Environment
RELIABLE. PREDICTABLE. COST EFFECTIVE.
With over 50 years of experience, AI-Tek Instruments (formerly Airpax ®)continues to meet all your speed sensor needs. For quick delivery and competitive pricing, please contact your nearest distributor today!
Speed Sensors & Tachometers
Custom or Stock
With the people and products of AI-TEK Instruments working for you...Time is on your side!
New tachometers -
With Remote Programming Capabilities