Chlorinated polyethylene is a saturated polymer material with a white powder appearance. It is non-toxic and tasteless. It has excellent weather resistance, ozone resistance, chemical resistance and aging resistance. It has good oil resistance, flame retardancy and coloring properties. It is an excellent impact modifier for PVC plastics and a synthetic rubber with good comprehensive performance. It has a very wide range of applications and has been widely used in cables, wires, hoses, tapes, rubber and plastic products, sealing materials, flame retardant transport belt , Waterproof coiled material, film and various profiles and other products.
As a PVC impact modifier, CPE135A has many advantages such as low price, excellent performance, and excellent aging resistance, but it has certain disadvantages in the use of high impact and high hardness products and low temperature resistant products CPE135A. For example, in the formulation of rigid PVC, a large amount of CPE will reduce the hardness and rigidity, which reduces the physical properties of the product; in addition, when the low temperature resistance requirement of PVC products exceeds minus 30°C, CPE135A cannot meet the requirements. Under normal circumstances, modified CPE, such as ACM, RGC135A, etc., can be selected for rigidity and hardness improvement; for low-temperature resistance modification, impact-resistant ACR or other impact modifiers with lower glass transition temperature can be selected. CPE 135A,Cpe-135a,Cpe 135a Impact Modifier,Impact Modifier Henan Shunbang Chemical Industry CO.,Ltd , https://www.pvcresinchem.com
Fault Analysis of Differential Pressure Transmitter
The differential pressure transmitter is a typical self-balancing detection instrument that uses the working principle of negative feedback to overcome the influence of unfavorable factors such as component materials and processing techniques.
Failure analysis
1. Investigation method:
Review the fire, smoke, odor, power supply change, lightning strike, moisture, misuse, and mis-maintenance before the fault occurs.
2. Intuitive method:
Observe the external damage of the circuit, the leakage of the pressure guiding tube, the overheating of the circuit, the state of the power supply switch, etc.
3. Detection method:
1) Open circuit detection: separate the suspected fault part from other parts to see if the fault disappears. If it disappears, determine the fault. Otherwise, you can go to the next step. For example, the intelligent differential pressure transmitter cannot be normal Hart remote communication. The power supply can be disconnected from the body, and the transmitter can be powered by the power supply on the site to check whether the cable is superimposed with an electromagnetic signal of about 2 kHz to interfere with the communication.
2) Short-circuit detection: In the case of ensuring safety, the relevant part of the circuit is directly short-circuited. For example, if the output value of the differential transmitter is too small, the pressure-conducting tube can be disconnected, and the differential pressure signal is directly sent from the first pressure-taking valve. Directly lead to the differential pressure transmitter on both sides, observe the transmitter output to determine the plugging and leakage connectivity of the pilot line.
3) Replacement test: Replace the suspected faulty part and judge the fault location. For example, if the transmitter board is suspected to be faulty, you can temporarily replace it to determine the cause.
4) Division detection: divide the measurement loop into several parts, such as: power supply, signal output, signal transmission, signal detection, sub-section inspection, from simple to complex, from the table and inside, narrow the scope, find the fault position