Dwyer Series DH3 Digihelic

Digihelic® Differential Pressure Controller

Digihelic® Controller in Photohelic® Gage, Square Root Output for Flow

The Dwyer 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.

SWITCH SPECIFICATIONS
Switch Type: 2 SPDT relays.
Electrical Rating: 1 amp @ 30 VAC/VDC.
Set Point Adjustment: Adjustable via keypad on face.

ACCESSORIES:
A-298 – Flat aluminum bracket for flush mounting Capsuhelic® gage, 603A, 605, and 3000MR.
A-370 – Mounting bracket, flush mount Capsuhelic® gage or Series 600 Transmitter in bracket. Bracket is then surface mounted. Steel with gray hammertone epoxy finish.
A-465 – Flush mount space pressure sensor.
A-301 – Static pressure tip, for 1/4″ metal tubing connection.
A-302 – Static pressure tip, for 3/16″ and 1/8″ ID plastic or rubber tubing.
A-303 – Portable static pressure tip, for 3/16″ ID rubber or plastic tubing with 4″ insertion.
A-414 – 316 SS clean room pressure sensor.
A-307 – Static pressure fitting, for 1/4″ metal tubing connection.
A-308 – Static pressure fitting, for 3/16″ and 1/8″ ID plastic or rubber tubing.
A-417 – Static pressure pickup, for use in clean rooms, 100 micron filter picks up static pressure, stainless steel wall plate fits 2″ x 4″ electrical box, sealed with foam gasket, screws included. Barbed brass fitting holds 1/8″ to 5/32″ ID tubing.
A-418 – Static pressure pickup, room mount with Delta style plastic enclosure fits 2″ x 4″ electrical box, mesh screen hides static pressure pickup port, clean connection to 1/8″ to 5/32″ ID tubing and pressure sensor. Sealed with foam gasket, screws included.
A-419 – Static pressure pickup ceiling mount, plate rests on top of standard 3/4″ thick ceiling tile while 100 micron filter faces down through 5/8″ hole in tile, screws included for optional mounting to junction box, barbed fitting holds 1/8″ to 5/32″ ID tubing.
A-420 – Static pressure pickup for roof/outside mount, NEMA 4X (IP66) rated structure withstands harsh environmental elements, structure is 3-5/8″ across and 2-1/2″ deep, EMT conduit fitting is 1/2″, pressure connection is brass barbed fitting for 1/4″ tubing.
A-306-A – Outdoor static pressure sensor, provides average outdoor pressure signal for reference in building pressurization applications, includes sensor, 50 ft vinyl tubing, mounting bracket and hardware.
A-201 – Rubber tubing, 3/16″ ID, 9 ft length.
A-202 – Rubber tubing, 3/16″ ID, lengths to 50 ft, per ft.
A-203 – PVC tubing, 1/8″ ID x 1/4″ OD, per ft.
A-210 – Aluminum tubing, 1/4″ OD, 5 ft length.
A-211 – Aluminum tubing, 1/4″ OD, 50 ft length.
A-220 – Flexible vinyl tubing, clear 3/16″ ID x 5/16″ OD, lengths to 500 ft, per ft.
A-221 – Flexible vinyl tubing, clear 1/8″ ID x 3/16″ OD, lengths to 500 ft, per ft.
A-222 – Flexible vinyl tubing, clear .240″ ID x .375″ OD, lengths to 500 ft, per ft.
A-223 – Black polyethylene 1/8″ ID 1/4″ OD, 10 ft length, 200 psi maximum @ 140°F.