How to calibrate the capillary double flange transmitter with a 475 hand communicator

475 Communicator Related Uses.

You can take a look.

Approximately: maintenance calibration lower trim + upper trim calibration full scale (do not use zero trim).

Adjust the range to the zero point.

Verify with the simplest method: the medium is water, the measuring range is meters, the double flange conduction capillary is the density of silicone oil, and the dry calibration method is used.

Set the differential pressure range of the double flange differential pressure transmitter is A B

1. Use a set of valuers for verification.

a, the two flange faces are on the same horizontal plane.

Use a set of valuers, do not add signals to the two diaphragms of the transmitter, that is: divide a b into five equal parts, make the transmitter feel the five differential pressure values respectively, observe whether the output of the transmitter meets the requirements, if the deviation is out of tolerance, the corresponding technical adjustment should be made.

B, the negative pressure side flange is hung up to a height, so that the upper flange spacing is the same as the actual current signal, and the signal added to the transmitter is the differential pressure value generated by the actual liquid level change range, that is, 0 gh

If the measured zero point is h0 above the lower flange, the signal range is GH0 g (H0).

2. Use two sets of valuers to calibrate.

First of all, the two flange faces of the transmitter are on the same horizontal line, and two sets of valuers are used to add signals on the two flanges respectively, wherein, the signal added on the negative pressure side is A, which is fixed and immobile. Then add a signal to the positive pressure chamber, which is 0 b a, and the corresponding output signal is 4 20 mA

To match a matching flange, the root of the flange can be equipped with an 8mm copper pipe for air supply, which is calibrated with wind pressure. The valuer is a standard pressure generator, which can set the output pressure after the instrument air input. The piston can also be equipped with a longer copper tube with a mating flange.

Are you using a Yokogawa double flange?

When the transmitter is connected, you can usually see the measured value (PV), analog output value (AO), lower range (LRV) and upper limit (URV), etc.

By adjusting the lrv and urv, the zero point and span can be adjusted. Access the settings parameters of the connected device via the Device Settings "Device Settings" option, go to "Basic Settings", set the tag number, engineering unit, and then go to "Detailed Settings" to get more detailed sensor, signal correlation, output correlation, and device information.

If it is found that the 20mA or 4mA corresponding to the upper or lower limit of the level transmitter is relatively large, the current needs to be adjusted. In this case, a high-precision ammeter is required, and the ammeter needs to be connected serially to the communication loop during the adjustment process.

It should be noted that the instrument is already adjusted before leaving the factory and usually does not require user setup. The settings that may need to be changed on site are the "upper and lower limits", i.e. "range".

However, it is usually not confirmed until after the contract and technical agreement have been signed, and after communication between the customer and the manufacturer. This setting will be set for the customer at the time the instrument leaves the factory, unless changes are made.

When the transmitter is connected and online, you can generally see the measured value (PV), the analog output value (AO), the lower range limit (LRV), and the upper range range (URV).

By adjusting the LRV and URV, the zero point and range can be adjusted. Access the setting parameters of the connected device through the device setup option, enter the basic setup, set the tag, the engineering unit, and enter the detailed setup to carry out more detailed sensors, signal related, output related, device information, etc.

If you find that there is a large difference between the upper and lower limits of 20mA or 4mA of the level transmitter, the current needs to be adjusted. In this case, a high-precision ammeter is required, and the ammeter needs to be connected to the communication loop during calibration. For specific operation, please refer to the instruction manual of the communicator.

It should be noted that the instrument is adjusted at the factory and generally does not need to be set by the user. What may need to be changed on the spot is the "upper and lower limit" settings, i.e. "range".

However, this is generally confirmed through communication when the customer and the manufacturer sign the contract and technical agreement, which will be set up for the customer when the instrument leaves the factory. Unless there is a change.

How to change the flow metering range.

HART475 communicator, you adjust the pressure transmitter, select the pressure transmitter in the options, enter the ** option, such as range: upper limit, lower limit modification, zero dry check, etc., through the corresponding ** to complete the logarithmic modification you need, ** means that there is a correspondence in the instruction manual.

14 years to buy can calibrate the honeywell transmitter, including STD700 800 series If you buy 475 earlier, you have to spend money to upgrade to or Otherwise, the unit can not be changed on the spot, and there are many parameter menu databases that are not available, such as self-diagnosis, if you adjust the range separately and clear it, 375 can be.

Only the HART protocol is supported. It should be a parameter setting, not a calibration.

1.At zero point, when the upper and lower flanges are empty, the pressure on both sides is the same, and the differential pressure level is also zero, and the pressure difference caused by the weight of the silicone oil in the capillary is displayed on the table. You use the communicator to clear the zero, which is to set the zero artificially.

2.After the zero point is found, this value can be read with a communicator, which may be MMH2O or KPA, and there are two ways to set the full scale.

After the zero point is set to zero, inject the material into the full tank, and see the value displayed by the instrument. This is the number of full scales. The upper limit of the range can be set to it;

Measure the center distance of the upper and lower flanges, multiply the specific gravity of the material, and add this value to the original zero value, which is the upper limit of full scale.

The capillary is filled with oil to allow the force on the flange diaphragm to be transmitted to the transmitter. The length of the capillary is related to the flange mounting spacing of the double flange transmitter.

The pressure transmitter of the PA bus does not need to be adjusted by the communicator, and the PA bus does not need to adjust the zero point and full scale, and the address can be adjusted through the meter header!