Liquid level instrument selection instructions

What should be paid attention to in the selection of liquid level instruments/liquid level gauges? 1. Selection of liquid level transmitter (1) The characteristics of the medium must be considered, such as the content of impurity components and whether it is easy to scale. (2) Consider the working conditions, such as pressure, temperature, and liquid level range, to determine the optional range of the liquid level gauge; (3) Consider the installation method, such as the opening position, diameter, standard, material, etc. of the liquid level gauge on the process equipment ; Others should also consider price; primary selection of instrument manufacturers; repair and maintenance; after-sales service, etc. 2. Selection of supporting instruments (1) Digital display: It can visually display the liquid level of the detected liquid; set the liquid level point arbitrarily: You can arbitrarily set the liquid level parameter value required by the site on the display controller panel, which is easier to use. Relay switch output: normally open/normally closed, which can easily meet various automatic control requirements. (2) Direction definition: each liquid level can be output by rising or falling, which is in line with conventional habits. (3) Communication: It can form a computer centralized monitoring and management system. (4) Hysteresis protection: Avoid malfunction caused by liquid level fluctuation and protect the safety of the control system. (5) Fault self-check: When the signal of the liquid level transmitter exceeds the range, or the connecting line is open and short-circuited, the fault code will be displayed, which is convenient for maintenance. (6) Translation correction: When the installation position of the liquid level transmitter is lower or higher than the bottom surface of the detected container, it can be corrected to make the liquid depth display value the same as the liquid depth actual value, which is more intuitive. (7) Specific gravity correction: When detecting liquid levels of different specific gravity, it can be corrected to make the displayed value of liquid depth consistent with the actual value of liquid depth, which is more intuitive. Electronic parameter lock: avoid misoperation by non-professional technicians.
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