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Keller has given more than 150 years of service to the construction industry. From modest beginnings, it has grown into a Group with revenue of more than £۱٫۵ billion and around 10,000 employees operating in more than 40 countries.
Differential Pressure Transmitters Series PRD-33 X
With high Overload Resistance and Line Pressure Output
The Series PRD-33 X was developed for applications that require a high accuracy differential pressure measurement together with high overload resistance in differential pressure ranges as low as 350 mbar.
The Series PRD-33 X is the result of ongoing development of the KELLER PD-33 X differential pressure transmitter. Thanks to a second integrated pressure sensor, the line, or common mode, pressure can now be measured along with the differential pressure, resulting in several notable features not found in traditional differential pressure transmitters.
For example, compensation for line pressure effect is now accomplished during factory calibration. Moreover, both differential and line (absolute) pressure may be read by the user. In addition, the PRD-33 X features high differential overload resistance; e.g., ± ۳۵ bar with a differential measuring range of only 350 mbar (100:1).
The internal differential pressure sensor element is isolated from the High (+) side media by a compliant stainless steel diaphragm, while the Low (-) side media impinges directly on the back side of the silicon measuring cell. Also isolated from the High (+) side media is the line (absolute) pressure sensor. The floating sensor assembly guarantees maximum decoupling from external mechanical forces.
Capacitive Transmitters Series 46 X / ۴۶ X Ei
For Water Level Measurements
The Series 46 X combines the ceramic measuring cell for low pressure ranges with the µP-electronics of the digital Series 30 pressure transmitters. The signal values of the pressure- and temperature sensors are determined by a polynomial compensation. The values can be shown and stored on a PC and can be reprogrammed. A reference tube integrated in the cable connects the referential chamber of the sensor with the ambient pressure.
This pressure transmitter is also available as intrinsically safe version (Series ۴۶ X Ei). It is used in explosion exposed areas, where the categories 1 and 2 are required.
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