PRESSURE

SERIES DH3

DIGIHELIC®
3 DIFFERENTIAL PRESSURE CONTROLLERS
Digihelic Controller in Photohelic Gage, Square Root Output for Flow
® ®

2-1/16 [4] 6-32 HOLES EQUALLY

[52.39] SPACED ON A 5-1/8 [130.18] 11/16 1/8 FEMALE NPT
1/8 FEMALE NPT 2 B.C. PANEL MOUNTING [17.46] HIGH PRESSURE
HIGH PRESSURE [50.80] 1/2
[12.70] CONNECTION
CONNECTION
30°
1-1/4 Ø5 1-9/32 1-3/4
[127.00] [32.54] 1/2
[31.75] [12.70] [44.45]
ø4-47/64
1/8 FEMALE NPT [120.25]
LOW PRESSURE
CONNECTION [3] Ø3/16 [4.77] HOLES
5/8 [15.88] Ø4 [101.60] 1/8 FEMALE EQUALLY SPACED ON A
11/16 4-1/8 [104.78] B.C.
PANEL MAX FACE NPT LOW [17.46]
2-1/2 5-1/2 [139.70] O.D. PRESSURE SURFACE MOUNTING
VIDEO ON
3/16 MOUNTING RING
[63.50] [4.76] CONNECTION
LI
NE

Note: Shown with optional -SS bezel.

Backward compatible+ with Magnehelic® gage.

The Series DH3 Digihelic® 3 Differential Pressure Controllers are 3-in-1 instruments SPECIFICATIONS
possessing a digital display gage, control relay switches, and a transmitter with current Service: Air and non-combustible, Output Signal: 4-20 mA DC into 900
output all packed in the popular Photohelic® gage style housing. Combining these 3 compatible gases. Ω max.
features allows the reduction of several instruments with one product, saving inventory, Wetted Materials: Consult factory. Zero & Span Adjustments: Accessible
installation time and money. The Digihelic® controller is the ideal instrument for Housing Material: Die cast aluminum via menus.
pressure, velocity and flow applications, achieving a 1.5% or better full-scale accuracy case and bezel. Response Time: 250 ms (damping set
on ranges down to the extremely low 0.25 in w.c. to 2.5 in w.c. full-scale. Ranges of 5 in Accuracy: ±1.5% for 0.25 in and ±0.25 to 1).
w.c. and greater maintain 0.5% FS accuracy. Bi-directional ranges are also available. in w.c. ranges. Ranges 0.5 in to 5 in Display: Backlit 4 digit LCD 0.4˝ height
The Series DH3 Digihelic® controller allows the selection of pressure, velocity or w.c. and corresponding bi-directional LED indicators for set point and alarm
volumetric flow operation in several commonly used engineering units. 2 SPDT control (except ±2.5 in w.c.) ±1%; All other status.
relays with adjustable deadbands are provided along with a scalable 4-20 mA process ranges: ±0.5% @ 77°F (25°C) including Electrical Connections: 15 pin male
output. hysteresis and repeatability (after 1 hour high density D-sub connection. 18˝ (46
Programming is easy using the menu key to access 5 simplified menus which provide warm-up). cm) cable with 10 conductors included.
access to: security level; selection of pressure, velocity or flow operation; selection of Stability: < ±1% per year. Process Connections: 1/8˝ female
engineering units; K-factor for use with flow sensors; rectangular or circular duct for Pressure Limits: Ranges (uni- and NPT. Side or back connections.
Gages/Switches, Transmitters

inputting area in flow applications; set point control or set point and alarm operation; corresponding bidirectional), ≤ 1 in w.c.: Mounting Orientation: Mount unit in
alarm operation as a high, low or high/low alarm; automatic or manual alarm reset; 9 psi; 2.5 and 5 in w.c.: 1.5 psi; 10 in vertical plane.
Differential Pressure

alarm delay; view peak and valley process reading; digital damping for smoothing w.c.: 3 psi; 25 in w.c.: 8 psi; 50 in w.c.: 15 Size: 5˝ (127 mm) OD x 3-1/8˝ (79.38
erratic process applications; scaling the 4-20 mA process output to fit your applications psi; 100 in w.c.: 20 psi. mm); -SS bezel: 4-3/4˝ (120.7 mm) OD x
range and field calibration. Temperature Limits: 32 to 140°F (0 to 2-21/32 (67.5 mm).
60°C). Weight: 1.75 lb (794 g).
FEATURES/BENEFITS Compensated Temperature Limits: 32 Agency Approvals: CE.
• 3-in-1 instrument allows the reduction of several instruments with one product, to 140°F (0 to 60°C).
saving inventory, installation time and money Thermal Effects: 0.020%/°F (0.036/°C) SWITCH SPECIFICATIONS
• Full-scale accuracy of 1.5% or better even on extremely low ranges, and 0.5% for from 77°F (25°C). For 0.25 in and ±0.25 Switch Type: 2 SPDT relays.
ranges above 5 in w.c. provide for greater measurement precision in w.c. ranges: ±0.03%/°F (±0.054%/°C). Electrical Rating: 1 A @ 30 VAC/VDC.
• Secure menu program provides access to device operation only for the right skill Power Requirements: 12-28 VDC, 12- Set Point Adjustment: Adjustable via
level 28 VAC 50 to 400 Hz. keypad on face.
• Optional stainless steel bezel is the same installation diameter as Magnehelic® gage Power Consumption: 3 VA max.
and simplifies field upgrade to DH3 pressure controller
ACCESSORIES
APPLICATIONS Model Description
• SCFM duct flow A-298 Flat aluminum bracket for flush mounting
• Filter status A-301 Static pressure tip for 1/4˝ metal tubing connection
• Duct or building static pressure A-302 Static pressure tip for 3/16˝ and 1/8˝ I.D. plastic or rubber tubing
• Damper and fan control A-302F-A 303 SS static pressure tip with mounting flange; for 3/16˝ I.D. rubber or
plastic tubing; 4˝ insertion depth; includes mounting screws
MODEL CHART A-370 Mounting bracket flush mount bracket; bracket is then surface
Model Ranges Model Ranges mounted; steel with gray hammertone epoxy finish
A-489 4˝ straight static pressure tip with flange
DH3-002 0 to 0.25 in w.c. *DH3-010 0 to 50 in w.c.
DH3-003 0 to 0.5 in w.c. *DH3-011 0 to 100 in w.c.
DH3-004 0 to 1 in w.c. *DH3-013 0 to ±0.25 in w.c.
DH3-005 0 to 2.5 in w.c. *DH3-014 0 to ±0.5 in w.c.
DH3-006 0 to 5 in w.c. *DH3-015 0 to ±1 in w.c.
DH3-007 0 to 10 in w.c. *DH3-016 0 to ±2.5 in w.c.
DH3-009 0 to 25 in w.c. *DH3-017 0 to ±5 in w.c. OPTIONS
*DH3-018 0 to ±10 in w.c. To order add suffix: Description
*Velocity and volumetric flow not available on bi-directional -SS 304 brushed stainless steel bezel. +Backward compatible
range units and models DH3-010 and DH3-011. with standard Magnehelic® gage installation diameter
Example: DH3-004-SS
-NIST NIST traceable calibration certificate
Example: DH3-004-NIST
-FC Factory calibration certificate
Example: DH3-004-FC

Process Tubing Options: See page 455 (Gage Tubing Accessories)

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