Float level gauge
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Our company’s steam condensate separation tanks for boilers are equipped with float-type level gauges, which have consistently provided inaccurate readings. As a result, manual control of the liquid level is required during operation, leading to high steam consumption. Please provide an explanation and suggest solutions. Thank you!
The key is to find the cause of the inaccuracy in order to solve the problem. There are various reasons for inaccuracy, and it is necessary to understand the industrial control conditions on site to know them.
“The steam condensate separation tank is equipped with a float-type level gauge, which has always provided inaccurate readings; therefore, manual control of the liquid level has been used during operation, resulting in high steam consumption. First of all, there’s something wrong with what you’re saying: the readings are inaccurate, and manual control is used to manage the liquid level. Which level is this manually controlled level? It’s still not allowed! I think the problem here is that the PID parameters of this level controller haven’t been set properly, and it’s not in automatic mode! Find an expert to optimize the control scheme and then set it to automatic! Buoy measurement should have no problems for your type of application!
Reasons for inaccurate float level gauges: 1. The density of the medium is incorrect, resulting in a discrepancy from the values specified by the manufacturer and thus causing errors; in such cases, there should be a fixed error value. 2. Faulty pressure sensor. 3. Fault in the circuit section. The faulty component can be identified by using the weight-loading method to test the level gauge.
An inaccurate medium density is the cause of inaccuracy in float level gauges; since temperatures and pressures inside the condensation tank change frequently, the density of the condensate also changes often, which leads to inaccurate measurements.
Check the specification sheet to confirm the specifications of the buoy and compare them with the operating conditions. Next, use HART to confirm the float information.
This needs to be recalibrated, and adjustments should be made promptly in response to changes in the liquid density.
Please conduct the following physical calibration based on the actual density; as mentioned on the 3rd floor, \"float measurement should work without any problems for your application!\" ”