PRAL Front-Mounted Diaphragm Pressure Transmitter TP7DN

The PRAL outputs 4–20 mA in two-wire or three-wire technology, optionally 0–5 V or 0–10 V. The measuring surface is in the plane of the DN-20 clamp connection, so nothing collects in front of the diaphragm – designed for viscous, pasty and fibrous media and for cleaning in the installed state. The measuring body is a monolithic piece of 17-4 PH stainless steel, fully laser-welded and resin-potted. The price depends on the measuring range and sensitivity.

Nominal pressure selectable: relative 1, 2.5, 5, 10, 20 and 50 bar (zero point at atmospheric pressure) as well as vacuum versions -1/0, -1/+1, -1/+2.5 and -1/+5 bar, also with zero point at atmospheric pressure – they measure across zero, from -1 bar upwards.

Technical Data

• Output: 4–20 mA (2- or 3-wire) or 0–5 V or 0–10 V · Linearity and hysteresis ≤ ±0.25 %, calibration tolerance ≤ ±0.1 %.

• Temperature influence: Zero point ≤ ±0.015 %/°C, characteristic value ≤ ±0.015 %/°C · Reference temperature +23 °C.

• Zero point: Zero point position ±10 %, adjustable – adjustment inside under the nut · Response frequency 0.5 kHz.

• Power supply: 12–24 Vdc for 4–20 mA and 0–5 V, 15–24 Vdc for 0–10 V, maximum 28 Vdc · Current consumption 30 mA (3-wire) or 20 mA (2-wire).

• Connection: DIN 43650-A plug according to ISO 4400 · Load 0 to 470 Ω in current operation, at least 3 kΩ in voltage operation · Insulation resistance > 2 GΩ.

• Temperature: Operating -10 … +70 °C, storage -20 … +80 °C · Protection class IP65 according to EN 60529.

• Process connection: DN-20 clamp with flush diaphragm · no tightening torque – clamp connection.

• Dimensions: Ø 30 mm, length 95 mm · Flange Ø 35 mm with 15° seat, diaphragm Ø 17.6 mm · Height above axis 52 mm with DIN plug.

• Pressure limits: continuous 100 %, permissible 150 %, bursting > 300 %, highly dynamic 75 % of nominal pressure.

Application and Conformity

Viscous, pasty and fibrous media in food and pharmaceutical plants, filling lines and level measurement – wherever a bore in front of the diaphragm would clog or spoil the medium. CE, RoHS and REACH; EN 61326-1 and EN 61010-1; quality system according to EN ISO 9001. For versions from 20 bar, a declaration of conformity for food contact according to (CE) 1935/2004 and (CE) 2023/2006 (GMP) is available, material 17-4 PH (WN 1.4542).

On request: Calibration certificate. As an option, M12×1 connector instead of the DIN connector, cable outlet with 5 m cable instead of the connector, and the version for food contact (MOCA) from 20 bar.