Abstract: how to calibrate the metal rotameter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation.
Calibration with conventional methods of metal tube rotameter is no good, this is determined by the
transmitter structure theory.
Because the metal tube rotameter in the input pressure source and produce 4 -
Between 20 ma current signal, in addition to the machinery, circuit, and microprocessor.
More flow meter manufacturers choose model price quote you are welcome to inquire, here's how to calibrate the metal rotameter scale article details.
Calibration with conventional methods of metal tube rotameter is no good, this is determined by the transmitter structure theory.
Because the metal tube rotameter in the input pressure source and produce 4 -
Between 20 ma current signal, in addition to the machinery, circuit, and microprocessor chip operation work of the input data.
So calibration with conventional method.
Actually manufacturer of metal tube rotameter calibrating also have instructions, we produce series of transmitter, the calibration is: & other;
Set range throughout the &;
、“
Reset range & throughout;
、“
Trimming & throughout;
The points.
Among them & other;
Set range throughout the &;
Mainly through the LRV operation.
URV digital set to complete configuration and & other;
Reset range & quot;
Operation to connect the transmitter to standard pressure source, through a series of instructions to guide, induced directly by the transmitter of the actual pressure and the numeric set.
And initiative, zui setting range is determined directly by the pressure of real input values.
But to see despite transducer used in the analog output and input value relations correctly, but the process value of digital readout value will be slightly different, this item can be fine-tuning for calibration.
Due to metal tube rotameter is to separate the set-up and the parts necessary to alignment, so actual calibration according to the following steps: do a 4 - first
20 ma fine-tuning, the rectification of transmitter internal D/A converter, because it does not involve the sensing component, without external pressure signal source.
Do it again the fine-tuning, 4 -
20 ma, digital readout in conformity with the actual pressure signal, so you need to pressure signal source.
Do after zui reset range, 4 - by adjusting the analog output
20 ma in conformity with the additional pressure source, its role and zero (transmitter enclosure
Z）
, the tuning range (
R）
The effect of switch is exactly the same.
Some people think that, as long as with HART hands operator can change the metal tube rotor flow meter range, and can be adjusted to zero and range of work, without the need to input pressure source, but it cannot be called a calibration, can only be called & other;
Set range throughout the &;
。
The real calibration is need to use a standard pressure source input transducer.
Because do not use the standard and the tuning range (
LRV、URV）
Not calibration, ignore the input part (
Input pressure transmitter)
To adjust the output (
Conversion transmitter circuit)
Calibration is not correct.
Moreover pressure, differential pressure detection parts and A/D conversion circuit, the relationship between the output current is not equal, the purpose of calibration is to find the relation of the three.
Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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