In use, we often encounter some problems, such as inaccurate temperature measurement and fluctuations in temperature, etc. It is also very tangled to choose what kind of pressure transmitter before using the pressure transmitter. Unless you have a good understanding of the working environment and various models of temperature transmitters.
Pressure transmitter current over-range, check the diaphragm found that there are several small points, the measurement medium is steam, low point pressure diaphragm, made by the ice inelastically deformed. The on-site level gauge showed a large deviation from the control display. This situation is estimated to be frosty. It may also be that the temperature is too high and the oil boils up.
Measurement of steam is generally the use of condensate as a pressure transmission medium, so the need for steam heating to prevent the condensate freeze, in addition to pay attention not to let the steam directly long-term contact with the membrane box, and for the unused transmitter to put the pressure tube Condensation water is dropped to prevent condensation of water from falling down due to temperature drop of unused condensate, resulting in negative pressure suction and negative pressure causing damage to the bellows.
The diaphragm is flat on the whole, with only a dozen pinpoint-sized bumps, and it is not as frosty.
The steam transmitter must pay attention to the following points:
1, measuring steam, need heat tracing! Especially in the winter must add insulation, heat tracing.
2. For pressure transmitters, an isolation tank (condenser tank) must be added to prevent the high temperature of the steam from affecting the bellows and silicone oil.
The pressure transmitter has gained a high market share with its good performance and relatively affordable price. Therefore, although the quality of the pressure transmitter is relatively stable, it will be good after a long time. Some small problems, in order to avoid the emergence of these problems, Xiao Bian summed up some knowledge about the pressure transmitter price, such as the pressure transmitter may be slightly different prices in different places, the best place to buy of course It is this company. The following information hopes to help the customer.
1. The environment of the equipment site is rather harsh. The strong electric signals will generate various electromagnetic interferences. The lightning induction will generate strong surge pulses. In this case, a thorny problem encountered in the single-chip microcomputer application system is how to deal with the harsh environment. Reliably transmit tiny signals over long distances
Considering that the transmitter's high-frequency noise passes through the transformer, it does not depend on the mutual inductance coupling of the primary and secondary coils, but is coupled by primary and secondary parasitic capacitances. Therefore, the isolation between the primary and the secondary of the isolation transformer is shielded. Reduce its distributed capacitance to improve resistance to common mode interference.
2. However, the price of pressure transmitter is in the occasion where the signal needs long-distance transmission or the power grid has large interference in the environment. The use of voltage output type sensors has been greatly limited, and it has exposed poor anti-interference ability, and the line loss has destroyed the accuracy. Such as the shortcomings, and two-wire current output transmitter with its high anti-interference ability has been widely used.
3. The magnitude of this potential difference depends on the concentration of trioxonium oxide, which corresponds to the appropriate degree of hydrogen ion in the acidic solution being measured. If the appropriateness of yttrium, yttria and aqueous solution is taken as 1, the electrode potential can be calculated using the Nernst formula.
The concentration of the acid-base solution is proportional to the size of its electrical conductivity. Therefore, as long as the measurement of the conductivity of the solution changes, the concentration of acid and alkali can be known. When the measured solution flows into a dedicated conductivity cell, if the electrode polarization and distributed capacitance are ignored, it can be equivalent to a pure resistance. When there is a constant voltage alternating current flowing, the output current is linearly related to the conductivity, and the conductivity is proportional to the concentration of acid and alkali in the solution. Therefore, as long as the solution current is measured, the concentration of acid, alkali and salt can be calculated.
4. Such faults require replacement of the amplifier board. Transmitter in the line design and process assembly quality requirements are very strict, in actual use of the line failure, after inspection and confirmation, it is best to contact the manufacturer to replace the fault circuit board to ensure the stability of the instrument long-term work And reliable pressure transmitter prices.
5. The influence of the installation position of the micro differential pressure transmitter on the zero-position output Because of its small measurement range, the self-weight of the sensor in the transmitter affects the output of the micro-differential pressure transmitter. Therefore, it is a normal condition that the zero-variable conditions appear in the installation of the differential pressure transmitter. When installing, the pressure sensitive part of the transmitter should be perpendicular to the direction of gravity. If the installation conditions are limited, the transmitter should be adjusted to zero to the standard value.
6. Transmitter When the pressure on both sides is inconsistent, the working principle of the pressure transmitter and absolute pressure transmitter is the same as that of the differential pressure transmitter. The difference is that the pressure in the low pressure chamber is atmospheric pressure or vacuum.
7. We know that no matter what type of differential pressure transmitter, the positive and negative pressure chambers have exhaust, drain valves or cocks; this provides us with convenience for on-site calibration of differential pressure transmitters. Remove the pressure tube to calibrate the differential pressure transmitter. For this purpose, the dlr has been manufactured with the same threaded connection as the exhaust, drain valve or cock.
8. A thermal resistance is a primary component that converts a change in temperature into a change in resistance. Usually, the resistance signal is passed through a lead wire to a computer control device or other primary meter. Industrial thermal resistance is installed at the production site, and there is a certain distance between it and the control room. Therefore, the thermal resistance lead has a greater impact on the price of the pressure transmitter.
9 Resistive strain gauges are sensitive devices that convert strain changes on the device under test into an electrical signal. It is one of the main components of a piezoresistive strain transmitter. The most widely used resistance strain gauges are metal resistance strain gauges and semiconductor strain gauges. Metal strain gauges are also available in wire strain gauges and metal foil strain gauges. Usually, the strain gauges are tightly bonded to a mechanical strain matrix through a special adhesive, and when the stress is changed in the base body, the strain gauges are also deformed together, so that the resistance of the strain gauges is changed, and thus The voltage applied to the resistor changes.
The above 9 notes are the experience gained by the company during the actual operation and must be helpful to the customer. As long as you carefully use the pressure transmitter according to the above several precautions, you can get a good pressure transmitter. price!
Chlorinated Polyvinyl Chloride is a thermoplastic produced by chlorination of Polyvinyl Chloride resin. CPVC is significantly more flexible than PVC, and can also withstand higher temperatures. Uses include hot and cold water delivery pipes and industrial liquid handling. CPVC, like PVC, is deemed safe for the transport and use of potable water.
Cpvc C500,Pvc Resin Cpvc,Non Toxic Cpvc C500,Polyvinyl Chloride C500
Hebei Fengse New Material Technology Co.ltd. , https://www.hbfengsechemical.com