Blue Laser
Blue lasers include DPSS (diode-pumped solid-state) Laser and diode laser. The laser head comes with cooling and precise temperature control system, and power supply comes with overcurrent and overheating protection function. They are widely used in laser radar, interference measuring method and bioengineering etc.
Following wavelength are available for bule laser: 430 nm 440 nm 442 nm 445 nm 447 nm 450 nm 454 nm 457 nm 460 nm 462 nm 473 nm
480 nm 488 nm 491 nm
Blue Pulsed Laser: energy >50 μJ;
Blue High Power Laser: power >20 W;
Blue High Stability Laser: stability <0.1%;
Blue Low Noise Laser: noise <0.25%;
Blue single longitudinal mode laser: linewidth <0.00001 nm.
Blue Laser,Blue Laser Diode,High Power Blue Laser,473 Nm Blue Laser Changchun New Industries Optoelectronics Technology Co., Ltd. , https://www.cnioptics.com
Only need to make periodic visual inspection of the instrument, check the surrounding environment of the instrument, sweep dust, ensure that there is no water and other substances, check whether the wiring is good, check whether there is new equipment with strong electromagnetic field near the instrument, or there is a newly installed wire across the instrument. If the measuring medium is easy to contaminate the electrode or in the measurement of the wall sedimentation, scaling, should be regularly cleaned, cleaned.
2, fault finding
After the meter has been put into operation or normal operation for a period of time, it is found that the instrument is not working properly. First, check the external conditions of the flow meter, such as whether the power supply is good, whether the pipe is leaking or is not in a full pipe state, whether air bubbles are in the pipe, and whether the signal cable is Damaged, converter output signal (ie, the rear instrument input circuit) is open. Remember to blindly remove the flowmeter.
3, sensor inspection
Test equipment: 500MΩ insulation resistance tester, a multimeter.
Test steps:
(1) When the pipeline is full of media, use a multimeter to measure the resistance between the terminals A, B, and C. The resistance between AC and BC should be as large as equal. If the difference is more than 1 time, it may be the leakage of the electrode, the measurement of the outer wall of the tube or the adsorption of condensed water in the junction box.
(2) When the liner is dry, use MΩ meter to measure the insulation resistance between AC and BC (should be greater than 200MΩ). Then use a multimeter to measure the resistance of the two terminals in the terminals A, B and the measuring tube (should be short-circuit connected). If the insulation resistance is very small, indicating electrode leakage, the entire flowmeter should be returned to the factory for repair. If the insulation is reduced but there is still more than 50MΩ and the inspection result of step (1) is normal, the outer wall of the measuring tube may be damp, and the interior of the housing may be dried by a hot air blower.
(3) Use a multimeter to measure the resistance between X and Y. If the resistance exceeds 200Ω, the excitation coil and its lead wire may be open or poorly connected. Remove the terminal board check.
(4) Check that the insulation resistance between X, Y and C should be more than 200 MΩ. If there is a decrease, use the hot air to dry the inside of the housing. In actual operation, a decrease in coil insulation will lead to an increase in measurement error and an unstable output signal of the instrument.
(5) If it is determined that the sensor is faulty, please contact the manufacturer of the electromagnetic flowmeter. The general site cannot be solved and it is necessary to go to the manufacturer for maintenance.
4, converter check
If it is determined that the converter is faulty and the external cause is no problem, please contact the manufacturer of the electromagnetic flowmeter. The manufacturer usually adopts the method of replacing the circuit board.
Precautions
1. Try to avoid ferromagnetic objects and devices with strong electromagnetic fields to avoid magnetic fields affecting the sensor's working magnetic field and flow signals.
2. Should be installed in a dry and ventilated place to avoid the sun and rain, the ambient temperature should be -20 ~ +60 °C, relative humidity less than 85%.
3. There should be plenty of space around the flowmeter for easy installation and maintenance.
Installation requirements
The measurement principle of the electromagnetic flow meter does not depend on the characteristics of the flow rate. If there is a certain turbulence and eddy in the pipeline is generated in the non-measurement area (such as elbow, tangential flow restriction, or a half-opening cut-off valve upstream), then Nothing to do. If there are steady-state eddy currents in the measurement area, it will affect the stability of the measurement and the measurement accuracy. At this time, some measures should be taken to stabilize the flow velocity distribution:
a. Increase the length of the straight pipe before and after;
b. Use a flow stabilizer;
c. Reduce the cross section of the measuring point.
Requirements for the external environment
1.1. The flowmeter should be installed in a place where the temperature changes greatly or is exposed to high temperature radiation from the equipment. If it must be installed, it must be insulated and ventilated.
1.2. The flowmeter is preferably installed indoors. If it is necessary to install it outdoors, it should be protected from rain, flooding and sun exposure, and moisture and sun protection must be provided.
1.3. The flowmeter should be installed in an environment containing corrosive gas and must be ventilated when it must be installed.
1.4. For installation, maintenance, and maintenance convenience, there is ample installation space around the flowmeter.
1.5. Flowmeter installation site should avoid the magnetic field and strong vibration source, such as the pipe vibration is large, there should be fixed pipe support on both sides of the flowmeter.
1, routine maintenance