Linear displacement sensor ds821, ds822

non-contacteddy currentindustrial

Applications: - Steam, gas, hydraulic turbines - Diesel, gas engines - Compressors Product Details: Non-contact displacement sensors provide reliable monitoring of vibrations in rotating shaft machines. The eddy-current displacement sensor range from Brüel & Kjær Vibro is suitable for monitoring rotating and reciprocating machines across a wide range of industries and for applications in hazardous areas. The measurement chain can be used indoors or outdoors when the drive device is installed in a suitable protective housing. Displacement measurement is the distance or amplitude moved from a resting position. The unit of measurement is µm or mils. Eddy-Current Displacement Sensors (ECDS) In many monitoring applications, non-contact eddy-current displacement sensors (ECDS) are the preferred choice for a wide range of condition monitoring and machine protection tasks. They are typically used to measure shaft vibrations and relative displacements, as well as reference sensors. They generally measure: - Vibrations (radial and axial shaft vibrations and displacements) - Reference (phase reference and speed measurement) - Position (e.g., axial shaft position, rod drop/position) These measurements help identify common machine faults such as imbalance and misalignment. Technical Description: Eddy-current displacement sensor systems consist of a displacement sensor with an integrated cable, an optional separate extension cable, and the driver (oscillator/demodulator containing the rest of the sensor system electronics and forming the interface with the monitoring system). Each series is available in system lengths of 5 m and 10 m. Our ECDS systems and sensors are divided into the following groups: - ds821 Series – Suitable for standard applications (measurement ranges of 2 mm, 4 mm, and 8 mm) - ds822 Series – For use in hazardous environments (ATEX, IECEx, EACEx, UL HazLoc) (measurement ranges of 2 mm and 4 mm) DS822 Series – ATEX ATEX-approved non-contact displacement sensors allow measurement of relative shaft vibrations, relative shaft displacement, rotor speed, etc. A conductive metallic measuring surface, preferably 42CrMo4, is essential. The sensor output voltage, within its displacement measurement range, is directly proportional to the distance between the sensor tip and the measuring surface. External disruptive influences such as ground loops, temperature effects, and dielectric influences such as oil and gas are negligible. Direct connection of signaling cables up to 1000 m long from the terminal cabinet to the electronic system is possible. Additionally, the sensor can be replaced without the need for recalibration. This displacement sensor meets the essential accuracy requirements of API-670 and DIN-45670 standards. Features: - Displacement sensors and inductive displacement sensors for measuring: - Relative shaft vibrations, axial vibration, speed/trip - Relative shaft position - Absolute and relative expansion - Speed and phase position - Rod drop (on compressors) - Eccentricity - Machine problem detection: - Imbalance - Misalignment - Bent shaft - Eccentricity - Shaft crack - Coupling issues - Oil whirl - Oil whip - Rotor rub - Excellent temperature stability - Robustness and high reliability - API 670 compliance - Ceramic probe tip for use in harsh environments Characteristics / Technical Specifications: - Technology: Eddy-current displacement sensors (ECDS) - Applications: steam, gas, hydraulic turbines, diesel/gas engines, compressors - Measurement ranges: 2 mm, 4 mm, 8 mm depending on the series - ATEX versions available (ds822 series) - System lengths: 5 m and 10 m - Sensor replacement without recalibration - API-670 and DIN-45670 compliance - Output proportional to tip/surface distance - Insensitive to external disturbances (ground, temperature, dielectrics) - Direct connection up to 1000 m