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What is the difference between transmitter and transducer ?

A pressure transducer is typically a millivolt or voltage system which converts input pressure into low-level electrical/electronic signals. These signals, however, are not suitable for transmission over long distances.

A pressure transmitter is a current loop instrument which incorporates an electronic amplifier and pressure sensor into one package, allowing measurement signals to be transmitted over long distances without loss of accuracy or the introduction of electrical noise. Transmitter output signals are typically 4-20 mA analog.

What is the difference between different sensing elements in your pressure switches.

Many factors go into the selection of a pressure switch, many of them application-dependent. But as a starting point, for applications requiring accuracy of ±1/2% and where there are fewer than 25 pulsations per minute, select a Diaphragm or Bourdon Tube model. The Diaphragm model is available from vacuum to 150 psi, and the Bourdon Tube model is available from 50 to 18,000 psi.

For applications where pulsations exceed 25 cycles per minute and where high over-pressures occur, select a Sealed Piston or Dia-seal Piston model. These models offer extremely long life (millions of maintenance-free cycles) with an accuracy of ±2%. The Dia-seal Piston model is available from vacuum to 500 psi, 1,000 psi proof. The Sealed Piston model is available from 15 to 12,000 psi.

Series DCX 16 Level Probes / Autonomous Data Collectors with Ø 16 mm

1.5 billion people around the globe have no access to clean water. Managing water as a resource is therefore the challenge of the 21st century.

A significant part of the world’s water resources is located underground. Large areas are surveyed using pressure sensors to monitor changes in the water level in relation to usage as well as rainfall. These sensors are inserted in wells up to 200 m in depth.

The major share of the cost of a measuring point is caused by the drilling operation and the pipe inserted into the earth. Until now, pipes with an inner diameter of 1 inch (2.54 cm) were mainly used, required by 22 mm diameter sensors. KELLER’s new DCX-16 features a Ø 16 mm diameter without compromising exactness, enabling much lower per-point installation cost.

Frequently Asked Questions - Pressure Switch

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What are the default communication settings for Keller transmitters?

By default Keller transmitters are set to 8 data bits, 1 start bit & 1 stop bit with no parity. The baud rate is 9600 by default (it can be changed to 115,200 baud). The default MODBUS address is 250.

How can I network several digital level or pressure transmitters to communicate over a single interface?

Please see the following application note:
Application: Network multiple Keller digital pressure or level transmitters using a single K-104 interface converter.

How do I clear the memory on my data logging device?

There is no way to manually clear or erase the memory of a Keller data-logger, nor is it necessary to do so. By default our data loggers will use all available memory until full capacity is reached, then once the data is extracted using the Logger DCX software the device will overwrite this old data as necessary. However, if the option 'Endless (circular memory)' is used in the Logger DCX software then the device will keep writing new data, while overwritting the oldest data, until logging is stopped.

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