Melt pressure sensor (transmitter)

Is a kind of accurate measuring equipment, using high-performance core components, digital analog integrated circuit design, through the program to achieve linear compensation, can obtain its high measurement accuracy, only properly handled, their service life will be longer. Be careful before installing the sensor (transmitter). The following describes some precautions for the installation and use of the high temperature melt pressure sensor (transmitter), and the correct connection and debugging to ensure trouble-free operation.ed the core basic parts, key basic materials, advanced basic technology, industrial technology foundation, industrial basic software and other "five foundations".

When installing the pressure sensor (transmitter), it must be noted that the hole of the sensor (transmitter) is within the size requirements indicated in the drawing below. Assembly accuracy can be checked by testing the bolts. Figure "a" is the correct installation position, figure "b" and "c" are the wrong installation position, before installing the sensor (transmitter), first of all to clear the hole and the impurities between the thread teeth, and then in the sensor (transmitter) thread coated with thread anti-stuck oil, because stainless steel external threads and internal threads are easy to die. Coated with thread anti-stuck oil can avoid screw bite, in the installation of the sensor (transmitter), the installation of the force is crucial, the sensor (transmitter) installation torque can only act on the shaft (hexagon), do not apply any force to the sensor (transmitter head) part.

The housing part of the sensor (transmitter) should be kept away from the high temperature area, and the housing part should be fixed on the support using the mounting bracket (see figure "D"). Flange installation method, according to the characteristics of the medium, should be in the sealing surface with a suitable sealing gasket.

1/2-20 UNF /M14×1.5= Maximum starting torque: 40Nm

M18 x 1.5 = Maximum starting torque: 50 Nm

Flange mounting = Maximum starting torque: 50 Nm

 

Unload

The disassembly of the pressure sensor (transmitter) must be completed under heated conditions (plastic melting point). When removing the sensor (transmitter), note that the diaphragm does not contact pressure. The force to unload the sensor (transmitter) must be applied only to the shaft (hexagon), and no force should be applied to the sensor (transmitter) head.

Threaded mounting holes

Scope of application

Melt pressure sensors (transmitters) are products designed for pressure monitoring of liquids, gases or pastes at high temperatures, they must be liquid, gaseous or viscous flow states, normal use under pressure does not exceed the upper limit of the measurement range, instantaneous pressure does not exceed 150% of the upper limit of the measurement range (based on the diaphragm surface). Any use outside the above application scope does not comply with the regulations.

Dangerous area

In the mounting seal area of the melt pressure sensor (transmitter), there is a risk of media leakage if the pressure transmitter is not properly installed or unloaded.

Security and storage

The pressure sensor (transmitter) is usually packaged separately, and at the front thread of the rigid rod, the sensing diaphragm is protected by a protective cap, which should be tightened at any time during storage and only opened when mounting in use.

 

Zero function

After the pressure sensor (transmitter) has been installed on the line, the electrical connection must be made as shown in the wiring diagram below. The CM series pressure transmitter is equipped with an integrated amplifier circuit (the sensor has no amplifier circuit). The zero clearing process must be carried out when the line is heated and the pressure is zero, which is adjusted by activating the automatic zero function, which is activated by a short connection of the corresponding wire (see wiring). At the same time, you can also use a magnetic pen to clear the shell 3-5s at the zero sign (see the figure below); mV signal does not have this function, can be zero through the back-end instrument. Then 80% of the output signal is detected (see wiring diagram), and the pressure sensor (transmitter) will provide a standard 80% of the measured value signal.

 Connection mode

Transmitter series: 0-10v 4-20mA

Cables shall be shielded. Each core wire shall be about 0.3mm2. The heat resistance temperature shall be no less than 105℃. The connecting terminal of each core wire shall be protected by heat shrink tube isolation. Cable welding should be particularly careful, otherwise it may lead to signal transmission errors or damage to the product, it is recommended to use GRAEFF soldered special cable. Use insulation tape to wrap each redundant cable.

The first step

Clean the plastic between the screws with a tap, and you can rotate it back and forth several times until the plastic in the thread is cleaned up.

The second step

Thread the reamer/threaded bushing into the hole and twist the threaded bushing into the mounting hole. Finger tightness is sufficient. Rotate the reamer clockwise, turn the reamer 2 turns, tighten the threaded casing again with your fingers, then rotate the reamer clockwise, and repeat until there is no further advance in the threaded sleeve.

 

The third step

To check whether the hole is cleaned correctly, the screw can be used for inspection. Paint colored coating liquid on the outer diameter, end face and 45° sealing surface of the screw, put the screw into the hole and tighten it, and then remove it. Only the coating liquid at 45° sealing surface of the screw should be rubbed off, and the coating liquid at the outer diameter and end face of the diaphragm should be complete. If the coating liquid is rubbed off the outer diameter and end surface of the diaphragm, it indicates that it has not been cleaned, and then repeat the first and second steps.

 

For other connector specifications, please contact the factory.