 Series DH3 Digihelic® Differential Pressure Controller Description: Series DH3 Digihelic® Differential Pressure Controller 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. 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: 12-28 VDC, 12-28 VAC 50-400 Hz. 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 (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. 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 lb (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. 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.
Standard Ranges| Model Number | Description | Manufacturer |
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| DH3-002 | Differential Pressure Controller, range 0-0.25" w.c. | Dwyer Instruments | | DH3-003 | Differential Pressure Controller, range 0-0.5" w.c. | Dwyer Instruments | | DH3-004 | Differential Pressure Controller, range 0-1" w.c. | Dwyer Instruments | | DH3-005 | Differential Pressure Controller, range 0-2.5" w.c. | Dwyer Instruments | | DH3-006 | Differential Pressure Controller, range 0-5" w.c. | Dwyer Instruments | | DH3-007 | Differential Pressure Controller, range 0-10" w.c. | Dwyer Instruments | | DH3-009 | Differential Pressure Controller, range 0-25" w.c. | Dwyer Instruments | | DH3-010 | Differential Pressure Controller, range 0-50" w.c. | Dwyer Instruments | | DH3-011 | Differential Pressure Controller, range 0-100" w.c. | Dwyer Instruments |
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Bi-Directional Ranges| Model Number | Description | Manufacturer |
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| DH3-013 | Differential Pressure Controller, range 0.25-0-0.25" w.c. | Dwyer Instruments | | DH3-014 | Differential Pressure Controller, range 0.5-0-0.5" w.c. | Dwyer Instruments | | DH3-015 | Differential Pressure Controller, range 1-0-1" w.c. | Dwyer Instruments | | DH3-016 | Differential Pressure Controller, range 2.5-0-2.5" w.c. | Dwyer Instruments | | DH3-017 | Differential Pressure Controller, range 5-0-5" w.c. | Dwyer Instruments | | DH3-018 | Differential Pressure Controller, range 10-0-10" w.c. | Dwyer Instruments |
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ACCESSORIES:| Model Number | Description | Manufacturer |
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| A-298 | Flat aluminum bracket for flush mounting Capsuhelic® gage, 603A, 605, and 3000MR. | Dwyer Instruments | | 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. | Dwyer Instruments | | A-465 | Flush mount space pressure sensor. | Dwyer Instruments | | A-301 | Static pressure tip, for 1/4" metal tubing connection. | Dwyer Instruments | | A-302 | Static pressure tip, for 3/16" and 1/8" ID plastic or rubber tubing. | Dwyer Instruments | | A-303 | Portable static pressure tip, for 3/16" ID rubber or plastic tubing with 4" insertion. | Dwyer Instruments | | A-414 | 316 SS clean room pressure sensor. | Dwyer Instruments | | A-307 | Static pressure fitting, for 1/4" metal tubing connection. | Dwyer Instruments | | A-308 | Static pressure fitting, for 3/16" and 1/8" ID plastic or rubber tubing. | Dwyer Instruments | | 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. | Dwyer Instruments | | 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. | Dwyer Instruments | | 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. | Dwyer Instruments | | 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. | Dwyer Instruments | | 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. | Dwyer Instruments | | A-201 | Rubber tubing, 3/16" ID, 9 ft length. | Same Day | | A-202 | Rubber tubing, 3/16" ID, lengths to 50 ft, per ft. | Dwyer Instruments | | A-203 | PVC tubing, 1/8" ID x 1/4" OD, per ft. | Dwyer Instruments | | A-210 | Aluminum tubing, 1/4" OD, 5 ft length. | Dwyer Instruments | | A-211 | Aluminum tubing, 1/4" OD, 50 ft length. | Dwyer Instruments | | A-220 | Flexible vinyl tubing, clear 3/16" ID x 5/16" OD, lengths to 500 ft, per ft. | Dwyer Instruments | | A-221 | Flexible vinyl tubing, clear 1/8" ID x 3/16" OD, lengths to 500 ft, per ft. | Dwyer Instruments | | A-222 | Flexible vinyl tubing, clear .240" ID x .375" OD, lengths to 500 ft, per ft. | Dwyer Instruments | | A-223 | Black polyethylene 1/8" ID 1/4" OD, 10 ft length, 200 psi maximum @ 140°F. | Dwyer Instruments |
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