Air Gap Transducers AGT-3G - 3rd generation The AGT-3G is a capacitive air gap monitoring system combining state-of-the-art digital signal processing, a robust sensor design resistant to strong magnetic fields, galvanically isolated inputs and outputs, and a modular architecture for dynamic rotor-stator gap measurement. KEY FEATURES MONITORING SOLUTIONS • Multiple measuring ranges for application flexibility Air gap • Embedded digital signal processing • 4–20 mA / 2–10 V outputs, galvanically isolated • Noise filtering algorithms for improved signal repeatability TYPICAL APPLICATIONS • Temperature range: −15 to +155 °C (sensor) • Immunity to magnetic fields • Modular design: sensor, oscillator, and demodulator Gearless millsdrives The dynamic air gap monitoring of generators consists of measuring the distance between rotor poles and stator while it is in operation. The MCm AGT range of air gap sensors are a non-contact dynamic position transducer utilising a capacitive technique to provide an accurate displacement measurement from the sensor face to a metal target. The advantage of the capacitive technique in generator applications is the high immunity to magnetic fields; the AGT series also provides high resolution and relative insensitivity to different (metal) target materials.

Typical contact-free capacitive Air Gap Transducer (AGT) is composed of 3 elements. It features separate Sensor (AGS), the Air Gap Oscillator (AGO) and the Demodulator (AGD). SENSOR Designed for long life cycles, harsh environments and strong magnetic fields. The sensor shape is suitable for its installation on the stator wall of generators and motors. A dedicated epoxy adhesive kit is available as an accessory for proper installation in the machine. OSCILLATOR With two executions available - standard and rugged - the oscillator is responsible for conversion of the distance detected by the sensor...

MEASURING RANGES OVERVIEW November 2025

AGD-212 M4 Linear measuring range Voltage output sensitivity Current output sensitivity Max. deviation from straight line Average linearity error 70 mm × 17.5 mm × 0.9 mm (L × W × H) with 80 mm of flex part MCX coaxial plug PTFE triaxial cable, outer diameter 3.2 mm (max.) 1.3 m (min.) approx. 35 g Interface Cable type Cable length Net weight TRANSDUCER OVERVIEW Flexible metal conduit SPR-AS external 17mm AirGap Oscillator (AGO) Flexible Polyamide PA-6 external 15.8mm Flexible Polyamide PA-6 external 10mm

AGD-525 M1 Linear measuring range Voltage output sensitivity Current output sensitivity Max. deviation from straight line Average linearity error AGD-525 M2 Linear measuring range Voltage output sensitivity Current output sensitivity Max. deviation from straight line Average linearity error AGS-525 M3 Dimensions Interface Cable type Cable length Net weight 221 mm × 32 mm × 3.5 mm (L × W × H) MCX coaxial plug PTFE triaxial cable, outer diameter 3.2 mm (max.) 1.7 m (min.) approx. 70 g TRANSDUCER OVERVIEW AirGap Demodulator (AGD) Flexible metal conduit SPR-AS external 17mm AirGap Oscillator (AGO)...

AGT-530 3G SPECIFICATIONS - RUGGED EXECUTION AGD-530 M3 Linear measuring range Voltage output sensitivity Current output sensitivity Max. deviation from straight line Average linearity error 5 to 30 mm (0.2 to 1.18 in) 0.32 V/mm 0.64 mA/mm < 3.5% of reading from 11mm to 29mm < 5.0% of reading from 5mm to 30mm < 0.8% AGS-525 M4 Dimensions Interface Cable type Cable length Net weight 221 mm × 32 mm × 3.5 mm (L × W × H) LEMO triaxial plug PTFE triaxial cable, outer diameter 3.2 mm (max.) 1.7 m (min.) approx. 50 g TRANSDUCER OVERVIEW AirGap Demodulator (AGD) High temperature and high strength Integral...

AGD-550 M2 Linear measuring range Voltage output sensitivity Current output sensitivity Max. deviation from straight line Average linearity error AGD-550 M3 Linear measuring range Voltage output sensitivity Current output sensitivity Max. deviation from straight line Average linearity error AGS-550 M3 Dimensions Interface Cable type Cable length Net weight 263.5 mm × 38 mm × 3.5 mm (L × W × H) MCX coaxial plug PTFE triaxial cable, outer diameter 3.2 mm (max.) 1.9 m (min.) approx. 90 g TRANSDUCER OVERVIEW AirGap Demodulator (AGD) Flexible metal conduit SPR-AS external 17mm AirGap Oscillator (AGO)...

AGD-550 MX Linear measuring range Voltage output sensitivity Current output sensitivity Max. deviation from straight line Average linearity error AGS-550 MX Dimensions Interface Cable type Cable length Net weight 263 mm × 80 mm × 3.5 mm (L × W × H) MCX coaxial plug PTFE triaxial cable, outer diameter 3.2 mm (max.) 1.8 m (min.) approx. 135 g TRANSDUCER OVERVIEW AirGap Demodulator (AGD) Flexible metal conduit SPR-AS external 17mm AirGap Oscillator (AGO) Flexible Polyamide PA-6 external 15.8mm Flexible Polyamide PA-6 external 10mm AirGap Sensor (AGS-550 MX)

GLOBAL SPECIFICATIONS OPERATION Output function Output range Loop resistance (current output) Output resistance (voltage outputs) AGD-xxx Mx temperature coefficient AGO-xxx M3 temperature deviation max. Typical frequency response (-3dB) Output noise System repeatability Interchangeability tolerance2 Current consumption < 2% of reading at mid-scale from 0°C to 85°C < 5% of full scale for all types excepted below: < 12% of full scale for types AGT-550 +24 VDC nominal ±10% / Warm-up time 10 minutes 125 mA typical Temperature range Operation Long term storage (all models) Relative humidity (non-condensing)...

CERTIFICATIONS CE certified UL certification All AGT systems comply with applicable European directives. Available on request for all Standard executions to meet North American safety requirements. TERMINOLOGY Max deviation from straight line Average linearity error Is the largest relative error calculated between the actual output level at any distance (voltage or current) and the theoretical output level for the same distance. This error does not include the interchangeability tolerance of the AGT parts. Is the relative error between the theoretical output sensitivity and the actual average...