The pressure transmitter is a commonly used measuring instrument, which can convert the physical parameters such as gas and liquid felt by the pressure measuring component into standard signal output, and has the advantages of accurate measurement, stable performance, high sensitivity and easy operation. When the user uses the product to verify the normal operation of the pressure transmitter, the pressure transmitter needs to be verified.
First, the true calibration of the pressure transmitter requires a standard pressure source to be input to the transmitter. Since the range (LRV, URV) is not calibrated without the use of a standard, ignoring the input section (pressure input to the transmitter) for output regulation (transfer circuitry of the transmitter) is not the correct calibration.
Furthermore, the relationship between the pressure and differential pressure detecting components, the A/D conversion circuit, and the current output is not equal. The purpose of the calibration is to find the relationship between the three. The pressure source is connected to the self-made joint through the rubber tube, the balance valve is closed, and the air circuit sealing condition is checked, and then the ammeter (voltmeter) and the hand-held device are connected into the output circuit of the transmitter, and the calibration is started after the power is preheated. We know that no matter what type of differential pressure transmitter, the positive and negative pressure chambers have exhaust, drain valve or cock; this is convenient for us to calibrate the differential pressure transmitter on site, that is to say, it is not necessary to remove the guide. The differential pressure transmitter can be calibrated by the pressure tube. When calibrating the differential pressure transmitter, first close the positive and negative valves of the three-valve group, open the balance valve, and then loosen the exhaust, drain valve or cock to empty, and then replace the positive pressure chamber with a self-made joint. The exhaust, drain valve or cock; while the negative pressure chamber remains loose, allowing it to pass through the atmosphere.
First adjust the damping to zero state, first adjust the zero point, then adjust the full scale pressure to full scale, so that the output is 20mA, the on-site adjustment is fast, here introduces the zero adjustment of the zero point and range. Zero adjustment has almost no effect on fullness, but the fullness has an effect on zero. When there is no migration, the effect is about 1/5 of the range adjustment, that is, the range is adjusted upward by 1 mA, and the zero point will move upward by about 0.2 mA. ,vice versa. It is not acceptable to calibrate the smart transmitter using the conventional method described above, as this is determined by the structural principle of the HART transmitter. Because the smart transmitter is between the input pressure source and the generated 4-20 mA current signal, in addition to the mechanical and electrical circuits, there is also the operation of the microprocessor chip on the input data. Therefore, the adjustment is different from the conventional method.
The actual pressure transmitter can be calibrated as follows:
1. Make a 4-20 mA trimming to correct the D/A converter inside the transmitter. Since it does not involve sensing components, no external pressure source is required.
2. Perform a full fine-tuning to match the 4-20 mA, digital reading to the actual applied pressure signal, thus requiring a pressure source.
Epoxy Adhesive
(1) solidifying rapidly within 3-5 minutes,
(2) suitable for small parts and structural strength
(3) can be used after one hour
(4) quick set and high adhesive performance
(5) can be lacquered and waxed
(6) waterproof and chemical medium
(7) joint layer is clear and elastic
Main Component:
A component is the modified Epoxy Resin, B component is modified Sulfur hardener
Scope Of Application:
The products of this series are widely used for bonding of metal and non-metals, connecting, sealing and repairing of hard materials, construction, automobile components, electronic components, also for usage in the material of pearls, jade, arts and crafts, antique etc.
Using Method:
1.The surface should be clean and dry, without oil or wax
2.Take down the cap, pierce the seal, squeeze out evenly (A:B=1:1). cover the surface with glue based on the mixing of the two components evenly,
3.Press it according to the actual condition.. it could achieve the using intensity after the solidifying for one hour during the normal temperature, it is suggested to operate at above 5℃.
Warning:
1.It must be even for the mixing of the two components during the adjusting of the glue. Quantity should not excess to much.
2.Tighten the caps after usage .Do not mix the cap of part A and B.
3.Wash the additional glue on the hands or the surfaces of bonding materials by alcohol before its solidifying.
4.Avoid touching with the eyes and skin directly. If getting touch with the skin, please wash them at once by using of a cloth with dipping of alcohol before solidifying, then, clean them by soap and warm water. If getting touch with the eyes, please wash them immediately with plenty of water, and see the doctor for serious situation.
5.Take strict precautions against touching by the kids and entering into the mouth.
Storage And Packing:
1.Stock the products with air-tight seal in the environment of shade and dry. The shelf life is one year. It is available to use based on passing of the test if being beyond the shelf life.
2.Preserve and transport as non dangerous products.
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Hunan Magpow Adhesive Group co.,ltd , https://www.magicglue.net