Metal tube float flowmeter is also called rotameter. The common faults in field applications are simply divided into the following eight points: 1, jitter:
(1) Slight jitter: Generally caused by medium fluctuations. This can be overcome by increasing the cushioning device or by increasing the straight section.
(2) Moderate jitter: Generally caused by the state of fluid flow. For the gas is generally caused by the media operating pressure instability. Stable or steady flow devices can be used to overcome or increase instrument air damping.
(3) severe jitter: mainly by the media pulsation, pressure instability can be stabilized, steady flow or increase the buffer device.
2, the pointer stopped at a position does not move
The main reason is that the float stuck.
Generally, when the instrument is used, the valve is opened too fast, so that the float impacts the stopper quickly and causes the stopper to deform and lock the float. However, it cannot be ruled out that the float guide rod is not concentric with the stop ring and the float is stuck. The instrument can be removed when processing, remove the deformation of the stopper, and check with the guide bar is not concentric, if the misalignment can be corrected, and then the float is installed, push the float, feel the float up and down unobstructed The card is fine. In addition, when the instrument is installed, it must be installed vertically or horizontally. It cannot be tilted. Otherwise, it will easily cause the card table and bring errors to the measurement.
3, when the flow does not move the pointer
In the case of ensuring that the floater is not stuck, the upper limit of the flow rate selected by the meter is too large, and the upper flow limit should be reduced.
4, the valve opens the meter pointer to the maximum
The main reason is that the instrument's range selection is too small and the instrument's range should be increased.
5, measurement error
(1) Installation does not meet the requirements
■Be sure to keep the vertical installation of the instrument vertical, the inclination is not more than 2 °.
■For horizontally mounted instruments, be sure to keep the level and the inclination is not more than 2°.
â– There must be no ferromagnetic objects in the 100mm space around the meter.
â– The installation location should be far away from the valve reducing port, the pump outlet, the process pipeline turning port, and so on. Need to maintain the requirements of the 250mm straight section after the first 5D.
(2) The larger change in the density of the liquid medium is also a cause of the larger error. Because the instrument is calibrated before the calibration, the media is converted according to the density given by the user, which is converted into the calibration of the flow of water under the calibration state.
Therefore, if the medium density changes greatly, it will cause great errors in the measurement. The solution can be to bring the changed media density into the equation and convert it into an error-corrected factor, and then multiply the flow rate measured by the flowmeter by the coefficient to the true flow rate.
(3) Since the medium of gas is greatly affected by temperature and pressure, it is recommended to use a temperature and pressure compensation method to obtain real flow.
(4) Due to many factors such as long-term use and pipeline vibration, the sensed magnets, pointers, counterweights, rotating magnets and other moving parts will be loosened, causing large errors. Solution: You can verify by first pushing the pointer by hand. First, press the pointer on the RP position to see if the output is 4mA, if the flow rate is 0%, and then verify according to the scale. If no match is found, the part can be repositioned. Generally require professionals to adjust, otherwise it will cause loss of position, need to return to the manufacturer for correction.
6, no current output
(1) First look at the wiring is correct.
(2) Whether the liquid crystal is displayed or not, if there is no output, the output tube is mostly bad, and the circuit board needs to be replaced.
(3) Loss of calibration value. Due to the failure of the E2PROM, the calibration data of the meter is lost, which also causes no output current and the current will remain unchanged. Solution: You can use the data recovery operation. If it does not work, you can first set the password 2000 data, and then set the data in the password 2008, the method is to manually calibrate the data from the RP-100%.
7, no live display
(1) Check that the wiring is correct.
(2) Check if the power supply is correct.
(3) Check if the LCD is damaged or the contact is not true.
8, on-site LCD display 0 or full scale
(1) Check the range and zero parameters set in the 2000 password. If the ZERO is less than the SPAN value, the two values ​​cannot be equal.
(2) Check if the sampling data is up. Use hand to push the pointer to see the change of the sampling value. If there is no change, it is generally a failure of the sampling circuit of the circuit board, and the circuit board needs to be replaced.
9, the alarm is incorrect
(1) Check that the deviation setting d cannot be too large.
(2) Whether the logic function is correct in the FUN function. HA-A represents the upper bound positive logic. LA-A represents the lower limit positive logic.
(3) Check the alarm value setting in the SU.
(4) Circuit board failure, replace the circuit board.
10. Accumulated pulse output is incorrect
(1) Check whether the alarm value of the selected cumulative pulse output is set to zero.
(2) Whether the external power supply is between 5-24V and has 1-5K resistance in series.
(3) Circuit board failure, replace the circuit board.
The quality, integrity and product quality of Suzhou Beit Intelligent Instrument Co., Ltd. have been recognized by the industry. Beit Instrument has always adhered to the principle of “treat hardship, treat people with sincerity, pursue excellence, customer first, quality firstâ€, and constantly forge ahead and develop steadily. Users are welcome to negotiate.
Screw Water Chiller
Screw Water Chiller
1. Air cooled screw water chiller: Cooling capacity 150-1180kW
Characteristics:
01.Compressor. The unit is equipped with semi-hermetic screw compressor, compared with the piston compressor, semi-hermetic screw compressor has two advantages
• Less parts(About 1/3 of the piston compressor), simple structure, less wearing parts, high reliability and long life.
• Compressor suction and exhaust uniform, exhaust temperature is low, vibration is small, not sensitive to wet compression, anti-liquid strike ability.
02.Tube-fin air-cooled condenser. The tube-fin air-cooled condenser adopts the inverted "V" type layout, on the one hand, it
improves the space utilization ratio, increases the heat exchange area, on the other hand, it improves the airflow and heat transfer efficiency, so that improve the unit's cooling and heating capacity.
03.Throttling equipment.For expansion valve, we select the most advanced products, with a compact overall design, rugged stainless steel diaphragm, and in a wide range of operating conditions to provide stable and accurate control.
04.Shell and tube evaporator. Using shell and tube structure, the outside is proceeded with fire-retardant,waterproof
insulation materials, water side of the working pressure is 1.0MPa. Evaporator with PVC plastic water board,
corrosion resistance. Chilled water along the diaphragm up and down circuitous flow, in order to increase the spoiler effect to improve the evaporator heat transfer capacity. Using the latest DAC corrugated spiral high efficiency heat transfer tubes, strengthen the fluorine side heat transfer capacity, improve the heat transfer coefficient to ensure that the unit good refrigeration and heating performance.
05.Electronic control. Air-cooled hot and cold water unit uses a microcomputer as the core of the controlsystem, the control system control precision, anti-interference ability to ensure that the unit safe, reliable and economical operation. Energy regulation automatic control can make the unit always in the best economic mode point efficient operation. Protection function complete unit with overload, short circuit protection, frost protection, high and low voltage protection, overheating protection and other functions.
2. Water cooled screw water chiller: Cooling capacity 130-2500kW
Characteristics:
01.Acting as multi-function unit such as cooling, heating, sanitary hot water separately or simultaneously.
02.Wide application as hotel, apartment, villa, factory, shopping center, office building, school, etc.
03.Semi- hermetic screw compressor for the whole range. Each compressor is equipped with a crankcase heater and a built-in electronic protection with temperature sensor located directly in the motor winding and on the discharge line.
04.The refrigerant circuit is complete with sight glass, filter drier, high and low pressure gauges, solenoid valve, electronic expansion valve, high and low pressure switch.
05.Shell and tube dry expansion type condenser, factory insulated with flexible close cell material.
06.Shell and tube evaporator, higher efficiency less water consumption, easy maintenance and cleaning, factory insulated with flexible close cell material.
07.The electric panel consists of compressor breaker, compressor contactor, phase sequence relay, control circuit breaker, microprocessor control with function display.
08.LCD display, touch screen control panel as standard.
09.Automatic operation dramatically reducing maintenance cost thanks to reliable microprocessor system.
10.An infinitely variable capacity control system that is capable of exactly matching the demand requirement of the system is to be supplied. This system is to provide precise and stable control of supply water temperature over the complete range of operating conditions.
11.Optional. Desuperheater as optional. Electronic controller with BMS system.
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