Universal differential pressure sensor 985 with a new IP65 enclosure
Differential pressure sensors for air allow for very reliable assessments of the status of a ventilation or air conditioning system in buildings. For example, they check if the filters are dirty, or if the fresh air ventilation runs properly. Through changes in air pressure, information about changes of the system parameters can be detected reliably. For building automation, air conditioning and clean-room systems, users thus have constant access to the most important operational data. To accommodate the manifold versions and requirements even in the difficult ambient conditions of these systems, a new differential pressure sensor now offers an enclosure in protection class IP65, as well as up to eight switchable measuring ranges.
In practice, this feature significantly facilitates work, if a user simply wants to install, correctly wire up and set the parameters of a pressure sensor in a few easy steps. A differential pressure sensor with adequate access at the open lid for these moves forms a good basic prerequisite for this purpose. Another useful feature is that the open lid is not separated from the device, but simply folds open and down during the installation works. If it becomes apparent during installation that the pressure conditions are not as expected, a suitable measuring range can be selected simply and quickly via the rotary selector switch without having to procure and use an alternative device. For this purpose, the new sensor by Beck Druckkontrolltechnik offers eight pressure measuring ranges that can be selected from the rotary selector switch and also various output signals. To guarantee clean, linear response for each range, the developers equipped the 985Q sensor with tried and tested automatic zero-point calibration. Drift caused by ageing, temperature or system-related influences can thus be reliably and permanently compensated.
The new 985 pressure sensor model range can capture differential pressures from 25 Pa to 100 kPa in various measuring range combinations. The three-wire output signal is selected through a jumper as 0...10 V or 4...20 mA. Likewise by jumper, users can select between a linear or a square-rooted signal. The latter is useful for measuring volume flows, for example. With a supply voltage of 24 VAC/VDC, current consumption with an LED display is a maximum of 230 mA. The IP65 enclosure measures 81 mm x 83 mm at a height of 41 mm. Two tube ports of 4 mm and 6 mm diameter allow for the use of tubes with different thicknesses for connection to the pressure port. The cable gland, with a cap nut screw connection of 15 AF, makes it possible to insert cables or stranded wires of up to 1.5 mm2 during on-site installation. The transmitters comply with EN 60770 and EN 61326, as well as RoHS according to 2011/65/EU.