Accumeasure Wireless Gap Measurement Probe System

June 17, 2022
MTI Instruments' Accumeasure Wireless Gap Measurement Probe System offers major improvement over conventional eddy current probes.

The Accumeasure Wireless Gap Measurement Probe System consists of up to four battery-powered, wireless capacitance probes paired via Bluetooth to their receiving device and is ideal for rotating machinery. The wireless capability and compact design of the probes enables them to measure gap in difficult-to-reach locations. Featuring improvement over conventional eddy current probe systems, capacitance probes are not susceptible to temperature drift, have built-in calibration, and are immune to magnetic field interference.

 

Transmitting displacement (gap) readings ranging from 0.1 to 2.0 mm from fixtures to the rotating machine surface, measurements are optimzed for machines with a surface velocity of 6,000 SFM. In addition, data from the receiver via RS-485 Modbus RTU interface protocol can be used for real-time monitoring of vibration and bearing health.

  • Wireless reliability: Works via Bluetooth in electrically-noisy industrial environments, and  is immune to jamming by other wireless devices
  • Smart sensing technology: Provides unique ID for each sensor
  • Networking capable: Up to four sensors/receiver, networked together for rich geometrical measurement
  • Replaces outdated eddy probes: Capacitance-based technology is insensitive to target material, provides self-contained absolute calibration, is non-contact, and can also measure dielectrics
  • Standard PLC interface: Simple to hook up to a PLC without any custom wiring
  • Battery-operated compact form factor: Can be easily placed in hazardous or unserviceable environments
  • Fast max sample rate: Up to four samples per second
  • Cost effective: Designed for affordability and mass unit deployment
Probe/Transmitter SpecificationsMeasurement Range0.1 to 2.0 mm (0.004 to 5/64 in.)Resolution0.014 mm (0.0006 in.)Accuracy0.043 mm (0.0017)Linearity error0.3% FSRMax. sample rate4 SPSMax. latency2 secondsPower3.4 to 4.5V DC (1x 3.6V LTC battery) At 5 mARadio Frequency2.4GHzMax. distance from the receiver device5 m (16.4 ft) (Mounting dependent)Max. number of devices in close proximity30 unitsRadio Frequency ConformityIEEE 802.15.1 (ISM standard)Size (Dia. x L)10 x 60 mm (0.4 x 2.4 in.)Weight10.5 g (0.4 oz.)Antenna Connector RequiredHirose U.FL-LP-040Battery ConnectorSURS # SM05B-SURS-TFMounting Thread10 mm x 0.75Battery LifeDependent on SPS and Sample Period

 

Sensor System Receiver SpecsMeasurement Range0.1 to 2.0 mm (0.004 to 5/64 in.)Power5 to 30V DC, 100mAInterface ProtocolRS-485 Modbus RTUProtocol Baud19200Protocol ParityEvenProtocol Stop Bits1Device Address0x42 (may be adjusted)Operating Temperature39 to 131°F (4 to 55°C)Storage Temperature5 to 150°F (-15 to 65°C)Radio Frequency2.4 GHzMax. distance from sensor5 m (16.4 ft) (Mounting dependent)Radio Frequency ConformityIEEE 802.15.1 (ISM standard)Size (H x W x L)15 x 44 x 64 mm (0.6 x 1.7 x 2.5 in.)Weight4 oz.ConnectorPhoenix Contact #1844263MatePhoenix Contact #1840382