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 andmoney. The Digihelic® controller is the ideal instrument for pressure, velocityand 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. andgreater 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 dampening for smoothing erratic process applications; scaling the 4-20 mA process output to fit your applications range and field calibration. See applications below for some popular uses.

Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Housing Material: Die cast aluminum case and bezel.
Accuracy: < 5? w.c. (except ±2.5? w.c.) : ±1%; All other ranges: ±0.5% at 77°F (25°C) including hysteresis and repeatability (after 1 hour warm-up).
Stability: < ±1% per year.
Pressure Limits: Ranges = 2.5? w.c.: 25 psi; ±2.5”, 5? w.c.: 5 psi; 10? w.c.: 5 psi; 25? w.c.: 5 psi; 50? w.c.: 5 psi; 100? w.c.: 9 psi.
Temperature Limits: 32 to 140°F (0 to 60°C).
Compensated Temperature
Limits: 32 to 140°F (0 to 60°C).
Thermal Effects: 0.020%/°F (0.036/°C) from 77°F (25°C).
Power Requirements: 12-24 VAC/VDC.
Power Consumption: 3 VA max.
Output Signal: 4-20 mA DC into 900 ohms max.
Zero & Span Adjustments: Accessible via menus
Response Time: 250 ms (dampening 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.
Process Connections: 1/8? female NPT. Side or back connections.
Mounting Orientation: Mount unit in vertical plane. Size: 5? (127 mm) O.D. x 3-1/8? (79.38 mm).
Weight: 1.75 lbs. (794 g).
Agency Approvals: CE.
SWITCH SPECIFICATIONS
Switch Type: 2 SPDT relays.
Electrical Rating: 1 amp @ 30 VAC/VDC.
Set Point Adjustment: Adjustable via keypad on face.