The smart converter and the electromagnetic flow sensor together form an electromagnetic flowmeter to measure the flow rate. Therefore, before handling the converter failure, please confirm that the flow state of the pipeline fluid, sensors, and system wiring are normal! a) Check whether the power is on; b) Check whether the power fuse is in good condition and the replacement of the fuse should be of the same model specification; c) Check whether the supply voltage meets the requirements; d) Check whether the display contrast adjustment can be adjusted and whether the adjustment is appropriate; e) If the above 3 items a), b), c) are all normal, f) When no problem is found, please send the converter to the manufacturer for repair. a) Whether the excitation wiring EX1 and EX2 are open circuit; b) The total resistance of the sensor excitation coil should be less than 150Ω; c) If both a) and b) are normal, the converter is faulty. a) Measuring whether the fluid is full of sensor measuring tubes; b) Short the three points of the converter signal input terminals SIG1, SIG2 and SIG GND with wires. If “empty tube alarm†and “electrode abnormality†are promptly withdrawn at this time, the converter is normal, and the measured fluid may have low conductivity. Or the electrode is covered by gas. c) Check whether the signal connection is correct; d) Electrode abnormality When the sensor is full of fluid, use a 500-meter analog multimeter, resistance × 1kΩ, and check the sensor electrode resistance. The red test leads of the universal meter are connected to the electrodes respectively, the black test leads are connected to the liquid electrode (liquid ring or metal pipe), the pointer of the universal meter swings from left to right, indicates about 3~50kΩ, and then goes from right to left Discharge, the difference between the two electrodes swinging to the right does not exceed 20%, otherwise the electrode is contaminated and covered. Use a digital multimeter to measure the direct current voltage between the DS1 and DS2 butt points (liquid contact electrode, contact ring, and metal pipe) to be less than 1V, and the DC voltage difference between the two electrodes should be less than 50mV. Otherwise, the sensor electrode is polarized. The upper limit alarm indicates that both the output current and output frequency (or pulse) are out of limits. Larger flow range can be undone Upper limit alarm. The lower limit alarm indicates that the output current and output frequency (or pulse) are out of limits. Reduce the flow rate to cancel Lower limit alarm. Intelligent judgments and prompts have been made in the flow range settings, flow totalizer settings, and pulse equivalent settings to facilitate modification of settings. If the system self-test alarm, please turn the converter to the factory for repair. a) Whether the fluid to be measured is filled with the sensor measuring tube and whether there is air bubbles in the pipe; b) Is the signal line connection normal, whether the insulation is lowered, and whether the ground connection is good? c) Check whether the sensor coefficient, sensor zero, and factory calibration coefficient are in accordance with the sensor tag or factory calibration sheet Correct setting d) Check the contact resistance of the sensor electrode with the liquid and whether the electrode insulation is good. a) The 232/485 conversion interface does not perform well. The conversion interface performance of different manufacturers varies greatly. b) The communication line material is not good. Must be a shielded twisted pair, if it is a common parallel line, because of the influence of distributed capacitance, the transmission distance will not be too far, the transmission speed will not go up. c) The communication line is in the wrong position or the communication line is reversed. d) The upper computer's instrument address, baud rate, and settings in the meter are not the same. e) The protocol is incorrect. Some protocols send two-byte commands, and some protocols send 4-byte commands. f) The communication distance exceeds 1000 meters, or the electromagnetic interference in the site is too large. In this case, repeaters should be added to increase the communication transmission capacity. g) When testing in the field, it is best to use a computer to connect directly to the instrument through a short line. This eliminates many factors such as wire, environmental electromagnetic interference, etc., and can quickly determine the 232/485 interface, wiring, or communication protocol.
In order to get continuous hot water in target temperature, NTC temp sensors & water pump & electric control system are required to work with TF Heater Element.
We make this Electric Testing Kit as Mini Electric Hot Water Dispenser Prototype, which can be set to supply target temperature hot water or water volume in each single heating process.
We also add a preheating water tank.
It'll help customers to understand how thick film heater works and to learn more thick film heater applications in new model R&D.
The Electric Thick Film Instant Heating Testing Kit is assembled by Thick Film Heater Element, DC Membrane Pump, PCB control system, LCD Display, Touch Buttons etc.
Target Temperature: 60℃, 70℃, 80℃, 90℃ and 100℃
Volume in single heat process: 150ml, 500ml and 1000ml
Test Kit With Water Tank,Test Kit ,Aquarium Water Test Kit,Hard Water Test Kit XINXIANG JIEDA PRECISION ELECTRONICS CO.,LTD , https://www.gidaheater.com
Instant Heating Test Kit with Preheating Water Tank
