Magnetic flap level gauges are quite unreliable, right?
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Magnetic flap level gauges seem to be very unreliable – they don’t flip when they should and flip when they shouldn’t. There is latency in the flipping of the magnetic rods, and these gauges are insensitive, inaccurate, and not real-time. We still use magnetic flap level gauges with remote transmission for our boilers, and they are often inaccurate. So, what kind of level gauge would be better suitable for boilers?
Indeed, magnetic flap level gauges may exhibit errors in certain situations. For this specific application of boiler level gauges, other types of level gauges can be considered as alternatives. Reliable options are radar level gauges and ultrasonic level gauges. Both radar level gauges and ultrasonic level gauges detect the liquid level using radio waves or sound waves, and process the signals to output a level signal. They all possess advantages such as high sensitivity, high precision, immunity to the properties of the liquid, and are not affected by the rate of change in liquid level. At the same time, they can also enable remote monitoring, and an alarm function can be set up to ensure the safe operation of the boiler. Although radar level gauges and ultrasonic level gauges are relatively expensive, their reliability and accuracy are worth considering. Therefore, if you want to monitor the boiler level more accurately, it is recommended to choose these two types of level gauges. .
The float level gauge we use comes with a dual-color glass panel; the electrodes are used to detect the high and low levels, and it works without any problems
The liquid level in the boiler drum is generally displayed locally using a dual-color glass plate level gauge; electric contact level gauges and differential pressure level gauges are used to provide dual remote transmission redundancy. The electric contact level gauge can be used to activate the blowdown valve for regular drainage, thereby preventing errors. The most commonly used one is still the differential pressure level gauge, as it is stable and durable.
Local: two-color level gauge; Remote: electric contact level gauge, differential pressure level gauge.
In high-temperature applications, magnetic flap valves require consideration of the matching between the Curie temperature of the magnet and the operating temperature. Put simply, magnets tend to lose their magnetism at high temperatures. It is better to use another type of level gauge.
The two-color level gauge works well; the readings are very clear
The two-color level gauge and the magnetic flip board mentioned in the comments are actually the same thing. Moreover, the temperature of the water used for boiler make-up shouldn’t be very high, right? It shouldn’t be high enough to cause demagnetization
I checked the dual-color glass plate level gauge – it works on the same principle as magnetic flip plates. The performance here isn’t good; presumably the flip plates aren’t very effective
It is necessary to check what temperature the magnetic material inside the magnetic flap level gauge can withstand, as high temperatures can easily cause demagnetization
For our liquefied petroleum gas, we use magnetic flap switches for on-site indication, along with a guided-wave radar level gauge for remote monitoring, to provide a comparison between the two. When the liquid level remains relatively stable, the magnetic flip plate still experiences discontinuities and its response is a bit sluggish.