Differential Pressure Transducer with dual Programmable Current Outputs

- Measuring of two static pressures P1 and P2.
- Calculation of differential and average pressures from P1 and P2.
- Two freely configurable 4-20mA analogue outlets.
- P1, P2 differential or average pressure can be assigned to outlets.
- Digital filtration of incoming data.
- Digital signal processing (correction of temperature dependency and nonlinearity of the sensor, temperature compensation of flow outlets).
- 13 bite D/A converter in each outlet.
- Programmable outlet range from 100 to 10% of a specified range.
- Programmable outlet shift from -20% to +20%.
- Large LCD display, character size 13 mm.
- Programmable display of P1, P2 differential or average pressures.
- Periodical alternation of selected values.
- Connection via 6/4mm polyamide tubing.

The DST 2000 is a smart pressure converter with two pressure inlets and two analogue current outputs. The signal received from its pressure sensors is digitally processed and corrected for sensor temperature dependency and nonliarity. Thus calculated values are displayed and transfered to the 4-20mA analogue current output. The preferred display mode, of either one or the periodical alternation of all values, as well as the current output allocation can both be preprogrammed prior to measuring. The pressure ranges and lowest value for each output can also be changed if necessary.

The DST 2000 pressure converter is typically used for measuring of differential pressures at junction exchange stations. For instance, while one of the outputs is set as a differential pressure outlet (e.g. at 500 kPa) , the other output can measure static pressures P1 or P2, or their average. In order to select the pressure range required, it is important to consider the maximal static pressures in each output.

Allocation of measured values to individual outputs:

**Output pressure P1**- allocation of current output to the relative pressure P1 input. The zero pressure and the nominal pressure range then correspond to currents of 4mA and 20mA respectively. ***Output pressure P2**- allocation of current output to the relative pressure P2 input. The zero pressure and the nominal pressure range then correspond to currents of 4mA and 20mA respectively. ***Differential pressure**- allocation of current output to differential pressure P1-P2. The zero differential pressure and the nominal pressure range then correspond to currents of 4mA and 20mA respectively. ***P1 and P2 average**- allocation of current output to the average of P1 and P2 pressures. The zero average pressure and the nominal pressure range then correspond to currents of 4mA and 20mA respectively.

* Only when the origin is offset to zero and the programmable range is set to 100%.

DST 2000 functions within an allocated output range of 100 % to 10% of a nominal pressure range. For example, when the pressure is 700 kPa, a pressure difference can be measured from the range of 70 kPa . The maximum overload is then 200% of the basic range, which in this case is 1,4MPa .

DST 2000 allows for a shift of up to +/- 20 % of the nominal range of pressure. For example, for a nominal pressure range of 500 kPa , the output can be shifted by +/-100 kPa .

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