The ME-7 Series LVIT (Linear Variable Inductance Transducer) Position Sensors from Alliance Sensors Group has been designed as an alternative to magnetostrictive sensors and has more robust construction and a lower cost of ownership. The unit can be embedded into the end cap of industrial or mobile hydraulic cylinders and pneumatic actuators. These ME-7 Series sensors are based on a proprietary contactless inductive sensing technology that employs a 7 mm diameter probe with a shorter stroke-to-length ratio than most other technologies, and uses a gun drilled hole in the cylinder rod for sensing the rod position rather than requiring a ring magnet assembly.
An ME-7 has a 1.89 inch (48 mm) diameter sensor head with an o-ring and back up ring in a groove, so it can be mounted in the same cavity in the cylinder cap and locked in with radial set screws just like a magnetostrictive sensor. Because they are contactless, ME-7 Series sensors do not wear out and have no output signal deterioration over the life of the sensors, and because it uses an inductive coil, an ME-7 sensor can withstand much greater shock and vibrations than other technologies. A very useful element of the ME-7 sensors is ASG’s proprietary SenSet™ feature whereby a sensor’s analog output can be adjusted in the field after installation to match the range of motion of the cylinder rod.
Analog I/Os: 0 – 5 V or 0.5 – 4.5 V output with 8 – 30 V input, 35 mA max. 0 – 10 V output with 12 – 30 V input, 35 mA max. 4 – 20 mA (3-wire) output with 18 – 30 V input, 60 mA max. (75 C max.)
Measuring Ranges: 0-25 mm to 0-600 mm (1 to 24 inches) Full Scale (nominal)
Linearity Error: ±0.15% of Full Scale Output (FSO) typical, ±0.25% of FSO max.
Resolution: 0.025% of FSO
Update Rate: 300 Hz nominal
Operating Temperature: -20 to 85 C (-40 C to 105 C Extended Range)
Temperature Coefficient: ≤±0.015% of FS/deg C
Operating Pressure: 5000 psig (350 bar) max operating, 7500 psig (520 bar) proof
Vibration: 5-20 Hz 0.5 inch p-p; 20-2000 Hz 4.2 g p-p
Shock: 1000g, 11 msec
Terminations: IEC IP-67
Humidity: 95% RH, non-condensing