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MJ-VR9810 Vibration Transmitter

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Kurze Einleitung
With the popularity of the DCS system, the traditional secondary instrument functions can be achieved basically by DCS system. We have successfully developed MJ-VR9810 vibration transmitter based on the eddy current displacement sensor.MJ-VR9810 vibration transmitter normalized and linearized the peak-peak vibration displacement sampled by the transmitter, directly output 4-20mA signal. MJ-VR9810 vibration transmitter connected with eddy current sensor probe and cancel the transmitter or instruments (like monitors).Reducing wiring link, installation link and the failure rate. It will lead the traditional proximitor and instrumentation section filtering, signal normalization processing, modularized signal output function, enhanced system integration, small size and improved reliability.
MJ-VR9810 vibration transmitter directly connect with DCS, PLC interface provides a simple, low-cost way to monitor rotating machinery rotor vibration and transmitter vibration. It can really play the right equipment protection through real-time monitoring the vibration of host and auxiliary equipment such as turbines, compressors, fans and pumps group .It measures accurate, stable and reliable with high anti-jamming performance.

Technische Indikatoren
1 Power supply: +24VDC
Maximum operating current: < 50mA
2 Input : Proximity Probe
3 Original signal buffered output: + 2V ~ + 10V,
Maximum transmission distance: 300 meters.
4 Transmitter sensitivity:8V/mm.
5 Vibration transmitter peak-peak output: 4 ~ 20mA
Maximum load resistance: 500Ω.
6 Output ripple: ≤20mV.
7 Frequency response: 10 ~ 1kHz (-3dB).
8 Temperature drift: ≤0.1% ℃.
9 Dimensions: 90mm (W) × 35mm (L) × 70mm (H).
10 Mounting dimensions: (1) Floor installation, 51mm × 51mm, using four M4 × 12 GB29-76 bolt installation; (2) Rail mounting, can be easily mounted on standard 35mm rail.
11 Connection method: SpringLoc terminals, automatic fastening function, no need installation tools. No loosening because of no bolts.
12 Operating temperature: -30 ℃ ~ 80 ℃.


Probe Installation
1 Ensure that the test surface is made of 40CrMo or it’s vortex effect is close to 40CrMo. Most of the turbine shaft, blowers and other equipment was made of 40CrMo material or similar material such as 45 steel. Therefore, unless customer specified in the order, or we will usually uses 40CrMo material for specimen calibration.
2 The MJ-VR9810 vibration transmitter effect is mainly concentrated in the surface to be measured .Since the effect of residual magnetism in the formation process, and non-uniform quenching, uneven hardness, the crystal structure will affect the unevenness sensor characteristics. API670 standard test surface residual magnetism is not recommended more than 0.5 micro tesla .The actual measured body should be calibrated if the application requires a higher measurement accuracy.
3, When you measure the MJ-VR9810 vibration transmitter , each measuring point should install two sensor probes .Two probes are mounted spaced 90 ° (± 5 °) on the same plane on both sides of the bearing.Since the bearing cap is generally horizontally split, so the two probes are usually mounted on each side of the vertical centerline 45 °, the probe is defined as X (horizontal) and Y probe (vertical direction). Usually see from motor end,Y probe should be on the left side to the right of the vertical center line and X probe should be on the right side to the right of the vertical center line.

4 Installation position of the probe should be close to the bearing, otherwise due to the deflection of the shaft, the measured values obtained will contain additional error. The maximum distance of probe position and the bearing are in the table below .

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