September 26, 2021

Huaheng Instrument: SMT3151 input level gauge maintenance program

In the introduction of the principle of industrial self-injection level gauge, the level measurement is carried out according to the pressure principle, and the pressure of the measuring probe is proportional to the water depth. Before being put into operation, the detection value of the secondary instrument must be corrected according to the water level gauge or other valid reference value of the river or river in the sluice gate to ensure the correctness of the sampled data. In the process of mobilization, for all kinds of instrumentation and automation equipment, "three-point use, seven-point maintenance" level gauge regardless of the model, performance, price, the patient level required at the time of purchase Counting type. It is also more important to maintain and maintain the level gauge. Maintenance is especially important in all level gauges. Now it is the maintenance and repair of Xi'an Huaheng Instrument-SMT1151 input level gauge.
For the introduction of the principle of SMT3151 input level gauge, the level measurement is carried out according to the pressure principle, and the pressure of the measuring probe is proportional to the water depth. Before being put into operation, the detection value of the secondary instrument must be corrected according to the water level gauge or other valid reference value of the river or river in the sluice gate to ensure the correctness of the sampled data.
SMT3151 input level gauge maintenance and maintenance: cleaning once a month. When cleaning, first open the cap of the iron pipe of the input water level gauge, carefully take out the SMT3151 level gauge; then remove the debris (such as water plants, plankton, etc.) attached to the SMT3151 level gauge. When cleaning the water level gauge pressure hole, use trichloroethylene or alcohol to inject the pressure hole to the height of one-half of the height for about 5 minutes, then shake it slightly and repeat it until it is cleaned. Do not use any appliance to clean the pressure hole to avoid damaging the sensitive core pressure sensitive diaphragm. When cleaning the SMT3151 level gauge pressure port and the pressure tapping hole, avoid using a brush or metal tool with excessive hardness to avoid damage to the sensitive core and the pressure interface thread. After the cleaning is completed, slowly return the liquid level gauge to the iron pipe. It is felt that the bottom of the iron pipe has been placed and the cap can be installed back to the original place. After reinstalling after cleaning, there will be some changes in the installation depth. The water level scale at the same water level of the sluice must be compared again to correct the detection value of the secondary instrument to ensure the correctness of the sampled data.
Not only does the SMT3151 input level gauge require maintenance and maintenance, but other types of level gauges also require timely maintenance and service. If you don't have good maintenance, there will be a lot of errors and some low-level errors in the use of the level gauge.


1. The SMT3151 input type liquid level meter adopts the principle of capacitance measurement. The outer insulation layer of the probe electrode can be made according to the different insulation materials of different media (such as PTFE with high temperature resistance, corrosion resistance, anti-aging and high chemical stability). Vinyl material) is insulated from the liquid to be tested during normal operation. Be careful to protect the outer insulation of the probe wire during installation. If it is damaged, it will lead to shortened use or installation failure. After the probe wire is installed, when it is completely immersed in liquid, the insulation resistance of the probe wire and the liquid (or the outer wall of the metal container) should be >20M (measured with a digital multimeter 20M). When measuring the insulation resistance, the probe wire should be The transmitter connection is temporarily disconnected.
2. When the SMT3151 input type liquid level gauge is installed in the open air, the probe line should not be exposed outside the container, so as to avoid measurement error in the rainy day.
3. The stainless steel process connection parts of the SMT3151 input type liquid level gauge or the lower part of the junction box must be reliably connected to the outer wall of the container (ground), and the contact resistance should not be greater than 2.
4. In normal operation, the probe line should not have a large swing amplitude in the container, otherwise signal instability will occur.
5. When installing the probe line, it should be as far as possible from the inner wall of the container. The small distance cannot be <100mm. When subject to conditions, the distance between the probe line and the container must be relatively fixed when the distance is <100mm.
6. For the single-wire soft probe, the excess part can be cut off after the upper end of the process coupling is pulled out, and then the deposit bolt is tightened, and the twisted pair probes, the excess part can be plated above the measured liquid level, absolutely not allowed The excess is coiled around the bottom of the container or the effective measuring section.
7. When there is agitation in the container or the liquid may generate a large amount of air bubbles, in order to protect the probe line and avoid false liquid level caused by liquid fluctuations and bubbles, a metal or non-metal tube having an inner diameter of >80 mm may be installed in the container. The lower end should be opened to enter the liquid hole, and the exhaust hole should be left below the liquid level. When using the metal tube, the position of the probe line in the tube should be ensured to be fairly stable. If necessary, support the probe line to straighten.
8. If an abnormality is found during use, turn off the power supply, stop using it, check it, or contact the technical department directly.
9. When connecting the power supply, it should be connected in strict accordance with the product installation and wiring instructions provided by the factory.


10. SMT3151 liquid level transmitter should be restored to the original packaging during transportation and storage, and stored in a cool, dry and ventilated warehouse.
The SMT3151 input level gauge is based on the principle that the static pressure of the measured liquid is proportional to the height of the liquid medium measured. The piezoresistive effect of diffused silicon or ceramic sensitive components is used to increase the temperature compensation and linear correction. The change is converted to a 4-20mADC standard current signal output, through which the indicator can be observed or remotely controlled. The great convenience of the SMT3151 input level gauge is that the sensor part can be directly put into the liquid. The SMT3151 input type transmitter can be connected by adding brackets or directly using the flange, which is extremely convenient for installation and use. SMT3151 input type liquid level transmitter is widely used in the measurement and control of water level and liquid level in petroleum, chemical, power plant, urban water supply and drainage, hydrological exploration and other fields.
Xi'an Huaheng Instrument Industry Automation Instrumentation and System Research and Development, Production, Sales and Service of High-tech Enterprises, based on the technological advantages of the original Xiyi, the company has developed and improved the core technology of inductive sensors and circuit boards, with more than 30 years of experience. Instrumentation production and research and development experience. As well as the exploration and research and development of HART protocol instruments, it is the pioneer of domestic intelligent instrument and HART protocol technology. It is mainly engaged in single flange level gauge, double flange level gauge, magnetostrictive level gauge, hygienic pressure. Transmitter, high-precision pressure transmitter, hart475 hand-operator, static pressure level gauge, input level gauge, a main product of the company that expands the technology enterprise from epitaxial expansion into connotative expansion. There are SMART Smart series pressure transmitters, liquid level (boundary) instruments, flow meters, temperature sensors and multi-parameter transmitters. Product measurement qualification, complete explosion-proof qualification, the entire production system has passed ISO9000 quality certification system certification. The research and development of intelligent magnetostrictive liquid level transmitter, double isolation static pressure level, wind load transmitter and other products have won a number of inventions, and received many praises from the market.

This article is collected and compiled by Xi'an Huaheng Instrument Manufacturer. Some materials come from the network

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