Dwyer Instruments' Series AT2DH3 Digihelic Differential Pressure Controller features control relay switches and a transmitter with current output
Dwyer Instruments' Flame-Proof ATEX-approved Series AT2DH3 Digihelic Differential Pressure Controller is a three-in-one instrument possessing a digital display gage, control relay switches and a transmitter with current output. The ATEX-approved Digihelic controller allows for the selection of pressure, velocity or volumetric flow operation in several commonly used engineering units. Two SPDT control relays with adjustable dead bands are provided along with a scalable 4 to 20 mA process output. In velocity or flow modes, a square root output is provided on the 4 to 20 mA signal to coincide with the actual flow curve.
The menu key provides access to: security level; selection of pressure, velocity or flow operation; selection of engineering units; K-factor for use with flow sensors; rectangular or circular duct for inputting area in flow applications; set point control or set point and alarm operation; alarm operation as a high, low or high/low alarm; automatic or manual alarm reset; alarm delay; view peak and valley process reading; digital damping for smoothing erratic process applications; scaling the 4 to 20 mA process output to fit your applications range and field calibration. Flame-proof ATEX enclosures are available in aluminum and can include a glass window for viewing process information and set point status on the digital display.