Flange level transmitter calibration method

Flange level transmitter adjustment:
　　
Our tool for level detection (taking into account the non-flowability of the measured medium, corrosion resistance, fouling, etc.) uses a single-inlet flange type 1151 liquid level transmitter, although the transmitter has excellent performance, but the use of When a year or a half load or range needs to be changed, it still needs a series of adjustments to make the product's performance meet the accuracy requirements. For this reason, we propose the following tuning methods for discussion: For non-intelligent 1151 Flange-type level transmitter with a range of 0-60kpa (transmitter's range code: 5, maximum 186kpa)
　　
Examples are:
　　
method one,
　　
Due to the flange-type liquid level transmitter, it has a diaphragm diameter of 76mm (manufacturer's standard size), for which we need to customize a calibration device for this interface. For example, if the range is 0-60kpa, you can add 60Kpa pressure to the positive pressure (H) side and adjust the "S" (range locator) to make the output current 20mA; after pressure relief, adjust the "Z" ( The zero positioner) makes the output current 4 mA. This repeats several times so that the calibration back-off is within the accuracy of the transmitter.
　　
Method Two,
　　
Since the 1151 transmitter has a "δ" chamber, it has a measuring diaphragm in the middle, and it produces a certain deformation with the pressure difference between the two sides. Therefore, add -60Kpa pressure in the negative pressure chamber (side), and adjust the "S" (range locator) so that the output current is 20mA; after pressure relief, adjust the "Z" (zero positioner) so that the output current is 4mA, This is repeated several times so that the checkback is within the accuracy of the transmitter. The advantage of this method is that it can be directly pressure-adjusted on the negative pressure side (standard 14-gauge pressure gauge fitting) when tested without a positive pressure side flange interface device.
　　
Method 3:
　　
Adjustment in the negative transfer state; first without any pressure, adjust the "Z" so that the output current is 4mA; secondly, the position of the positive and negative transfer jumpers of the amplifier circuit board components of the transmitter is "negative migration". status. Third, in the negative pressure chamber (L) by adding 60Kpa pressure, adjust the "Z" positioner, so that the current output 4mA; pressure relief, adjust the "S", so that the output is 20mA; (At this time, the transmitter has a range Change to -60-0Kpa to implement negative migration.) Fifth, change the negative transition position to no transition state, and adjust the "Z" zero to make the output current 4mA. Benefits of this method: The flange-type liquid level transmitter can be directly verified in a negative migration state, which facilitates the negative migration of closed-loop container liquid level detection.
　　
For smart transmitters now appearing, its range change only needs to be set (without adding any pressure), and its calibration (ie, characterization) needs to be carried out according to the above several methods, and its range setting The characterization can be performed on a dedicated device such as a host computer (with HART protocol interface and configuration software) or a 275 communicator.

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