Digihelic® Controller in Photohelic® Gage, Square Root Output for Flow
The SERIES DH3 Digihelic® Differential Pressure Controller is a 3-in-1 instrument possessing a digital display gage, control relay switches, and a transmitter with current output all packed in the popular Photohelic® gage style housing. Combining these 3 features allows the reduction of several instruments with one product, saving inventory, installation time and money. The Digihelic® controller is the ideal instrument for pressure, velocity and flow applications, achieving a 1% full scale accuracy on ranges down to the extremely low 0.25″ w.c. to 2.5″ w.c. full scale. Ranges of 5″ w.c. and greater maintain 0.5% F.S. accuracy. Bi-directional ranges are also available.
The Series DH3 Digihelic® controller allows the selection of pressure, velocity or volumetric flow operation in several commonly used engineering units. 2 SPDT control relays with adjustable deadbands are provided along with a scalable 4-20 mA process output.
Programming is easy using the menu key to access 5 simplified menus which provide 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 4-20 mA process output to fit your applications range and field calibration.
Please see SERIES AT2DH3 for ATEX approved.
|Service:||Air and non-combustible, compatible gases.|
|Wetted Materials:||Consult factory.|
|Housing Materials:||Die cast aluminum case and bezel.|
|Accuracy:||±1.5% for 0.25″ and ±0.25″ w.c. ranges. Ranges 0.5″ to 5″ w.c. and corresponding bi-directional (except ±2.5″ w.c.) ±1%; All other ranges: ±0.5% @ 77°F (25°C) including hysteresis and repeatability (after 1 hour warm-up).|
|Stability:||< ±1% per year.|
|Pressure Limits:||Ranges ≤ 2.5 in w.c.: 25 psi; ±2.5″, 5 in w.c.: 5 psi; 10 in w.c.: 5 psi; 25 in w.c.: 5 psi; 50 in w.c.: 5 psi; 100 in w.c.: 9 psi.|
|Temperature Limits||0 to 140°F (-18 to 60°C).|
|Compensated Temperature Limits:||32 to 122°F (0 to 50°C).|
|Thermal Effect:||0.020%/°F (0.036/°C) from 77°F (25°C). For 0.25″ and ±0.25″ w.c. ranges: ±0.03%/°F (±0.054%/°C).|
|Power Requirements:||12 to 28 VDC, 12 to 28 VAC 50 to 400 Hz.|
|Power Consumption:||3 VA max.|
|Current Consumption:||5 mA maximum|
|Output Signal:||4 to 20 mA DC into 900 Ω max.|
|Zero & Span Adjustments:||Accessible via menus.|
|Response Time:||250 ms (damping set to 1).|
|Display:||Backlit 4 digit LCD 0.4″ height LED indicators for set point and alarm status.|
|Electrical Connections||15 pin male high density D-sub connection. 18″ (46 cm) cable with 10 conductors included. 4′ and 10′ cables available.|
|Process Connections||1/8″ female NPT. Side or back connections.|
|Mounting Orientation:||Mount unit in vertical plane.|
|Size:||5″ (127 mm) OD x 3-1/8″ (79.38 mm).|
|Weight:||1.75 lb (794 g).|
|Switch Type:||2 SPDT relays.|
|Electrical Rating:||1 A @ 30 VAC/VDC.|
|Set Point Adjustment:||Adjustable via keypad on face.|