1. Application areas:
It is widely used in power, petrochemical, metallurgical and other industries of steam turbines, turbines, generators, blowers, compressors, gear boxes and other equipment displacement, vibration, speed, oil film thickness and other parameters of online monitoring and fault diagnosis.
1 coil optimum temperature stability parameter matching technology to ensure good probe temperature stability;
2 using the new PPS engineering plastics through the "secondary injection" process to ensure good probe sealing, dimensional stability and interchangeability, the working temperature range extended to -50 ℃ ~ +175 ℃;
3 deformation coupling "process combination, higher probe strength, reliability; QQ: 405287271
4 depth negative feedback stabilization resonant circuit technology, so that the stability of the precursor to (0.05% / ℃, 0.02% / year);
5 according to the US military specification design and production, the former device can be in -50 ~ +105 ℃ environment for long-term continuous work;
6 front-end circuit using fault-tolerant design to ensure that any wiring error will not be damaged;
7 pre-use device with the latest electronic technology, power consumption less than 12mA;
8 Producer housing using die-casting process, high-frequency socket and the terminal block inlaid protection, engineering plastics isolation insulation structure, so that the former device is more robust, easy to install and use;
9, advanced sensor phase frequency characteristics of the test and control methods, so that the factory production of a series of products in the dynamic characteristics of the leading international level. Can measure the measured object (must be a metal conductor) and the relative position of the probe end. As the eddy current displacement sensor long-term work of good reliability, high sensitivity, anti-interference ability, non-contact measurement, fast response, from oil and other media, often used for large rotating machinery shaft displacement, Shaft speed and other parameters for long-term real-time monitoring, you can analyze the work of the equipment and the cause of the failure to effectively protect the equipment and predictive maintenance.
The system mainly includes the shaft vibration probe, the extension high frequency cable (the user may choose according to need) the pre-device and the attachment.
Technical indicators
Probe diameter optional
Linear range according to user requirements
The sensitivity is determined by the output voltage and range
Linearity error <1%
Frequency response 0 ~ 10KHZ
Cable length 5m or 9m (selected when ordering)
Working temperature probe: -30 ~ +120 ℃; Proximitor: -20 ~ +65 ℃
Use power DC-24V (provided by instrument)
Requirements and methods for sensor installation
Selection of detection parts
The magnetic field generated by the probe coil is constant, and the eddy current field formed on the surface of the specimen is also constant. When the measured surface is flat, the diameter of the surface to be measured should be greater than 1.5 times the diameter of the probe head with the center of the center line of the probe. When the measured object is a circular axis and the probe centerline is orthogonal to the axis line , The general requirements of the measured shaft diameter for the probe head diameter of more than 3 times. Otherwise, the sensitivity will drop.
The detection position of the probe should be increased when the axial displacement is positive, and if the axial displacement is positive, the detection gap is reduced. Please specify when ordering. QQ: 405287271
installation method 
1. The installation of the probe
Shaft vibration displacement probe to be fixed by the bracket in the unit, as shown below, the bracket designed by the user, the design of the bracket should be sufficient rigidity to prevent vibration deformation, the probe installed on the bracket to be strong, not allowed to run There is loose.
The installation gap between the probe and the metal surface to be tested should be installed according to the installation clearance specified in the product calibration certificate and the voltage characteristic table. Do not twist the eddy current coil on the probe, high-frequency cable can not be arbitrarily twisted, plug not arbitrarily disassembly, so as to avoid damage.
The installation of the probe can also be done by measuring the output voltage of the preamplifier after the unit has been delivered separately (see the linear test report sheet).
2. Installation of high frequency cables
The cable between the front and the probe is a high-frequency cable. The total length of the cable is 9m or 5m (when the user orders), the cable length is not allowed to change, otherwise it will affect the measurement accuracy. After installation, the cable position is fixed so as not to cause unnecessary damage. Metal hose protection (ie armor) can also be added.
The 9m or 5m long high frequency cable can be connected to the high frequency connector for installation or use. So in the installation, the high-frequency connector must be sealed with insulating material wrapped.
3. The installation of the predecessor
The preamplifier should be floated (ie the front and the unit should be electrically insulated). In order to protect the front device from damage, it is recommended that the user add a pre-protection box, the first through the insulation board floating in the tin box, and then fixed in the rack or iron railings. Installation site temperature is less than 65 ℃, ventilation and vibration is small. Front connector and monitor the connection cable users can use three-core shielded cable, its length up to tens of meters. The shield should be in the control room at the single-ended access to the instrument.
Precautions
When installing the probe, the user should not have any other metal material in the clearance range of the probe area. To avoid the bumping of the probe, the probe should be installed so that it can not be loosened in operation.
The cable can not be twisted and any connection; cable in the middle of the high-frequency conversion head should be taken after the insulation measures to make it with the earth in the electrical isolation.
In the case of a preamplifier, the prespler should be mounted on an insulating plate so that the pre-device is electrically isolated from the earth.
It is best not to have a connector in the middle of the three signal transmission lines. If you want to consider the contact resistance of the joint as small as possible to reduce the signal loss in the transmission line process.