**Air flow differential pressure transmitter for measuring difference between pitot tube and static port pressure up to 1000 hectopascals.**

This version of the DPS 300 differential pressure transmitter has a 0…1000 hectopascal range with a square root extraction (sqrt) 4…20 milliamp current output which follows the same characteristic curve for flow vs pressure, and thus provides a linear signal output for air flow velocity measurement.

A pitot tube is a probe with a hole at the end of the probe tip, and holes around the circumference of the tube. The pitot tube is placed directly in the path of the flowing air, in order to collect the total pressure (P_{t}) generated by the flow at the probe tip, and the static pressure (P_{s}) generated by the air pressure surrounding the holes in the circumference of the tube.

The positive side of the differential pressure transmitter is connected to the total pressure (P_{t}) connection and the negative side is connected to the static pressure connection (P_{s}). Therefore the differential pressure transmitter measures P_{t} – P_{s}, and when combined with the square root extraction output configuration, the resulting signal is directly proportional to air flow reading.

## DPS 300 SqRt Output Differential Pressure Transmitter

- Part No: 815-1001-1-0-8-C-1-Y00-M-605
- Pressure Range: 0 – 1000
- Units: mbar
- Range Type: Differential (0 to +P)
- Output Signal & Supply Type: 4-20mA 2 wire
- Output Options: Square root extraction signal (flow, only with LC display)
- Accuracy (linearity only): 0.5% full scale
- Electrical Connection: M16 x 1.5 cable gland
- Process Connection: 6.6mm dia x 11mm barbed connections
- Media Compatibility: Air
- Optional Extras: integral LCD readout