Product Description

Model MPT262 melt pressure transducer or transmitter (MPT) is developed from the MPT160 sensor to measure pressures of melt medium of high temperatures (up to 400 °C). Employing metal foil strain gauge (MfSG) from BCM SENSOR as its sensing element, the MPT262 sensor has its wetted parts and housing made from stainless steel (SS) in order to comply with the requirements of pressure medium of high temperatures and harsh working environment. As a result, the MPT-series sensors find their applications on injection moulding machines and extruders to monitor or measure medium pressures.

Compared to MPT260, the feature of MPT262 has its rigid stem extended with a flexible SS extension between the rigid stem and its electronics hosing. By means of the flexible extension, the electronics housing can be kept a distance away from high-temperatures. As a result, the influence of higher melt temperature is limited on the electronics of MPT262.

The SS isolation diaphragm is located at the front end of the rigid stem and will be directly approached by melt pressure medium in applications. To avoid mechanical scratches, a specially designed alloy-coating is applied on the isolation diaphragm. Inside the rigid stem and the flexible extension, there is a capillary filled with nontoxic liquid-metal alloy which is not mercury and is able to truly transfers the medium pressure from the isolation diaphragm to an SS pressure diaphragm. The SS pressure diaphragm is located at the rear end of its flexible extension. On the backside of this pressure diaphragm there is a full bridge MfSG to convert deformation of the pressure diaphragm, which is induced by the measured pressure, into an electrical signal in millivolt.

To meet different requirements in applications, the MPT-series sensors can offer various types of output signal. The standard output signal can be either 3.33mV/V (i.e., the MPT262 without sensor signal conditioner (SSC)), or 4~20mA, 0~5V or 0~10V (i.e., the MPT262 integrated with SSC). By integrated with other kind of SSC, different output signals can be available, such as 4~20 mA with HART protocol, CAN-bus or modbus protocol.

For control purpose, a relay can also be integrated into the MPT-series sensors on request.

To facilitate the calibration on site, the MPT262 sensors are provided with internal 80%fs shunt calibration function. By means of this function the sensors can be calibrated any time without calibrating pressures.

Additional Information