Bulletin B-30 Series DH3 Digihelic® Differential Pressure Controller ® Specifications - Installation and Operating Instructions DWYER INSTRUMENTS, INC. P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Phone: 219/879-8000 dwyer-inst.com Fax: 219/872-9057 e-mail: info@dwyermail.
DIMENSIONS 1/8 FEMALE NPT HIGH PRESSURE CONNECTION (4) 6-32 HOLES EQUALLY SPACED ON A 5-1/8 (130.18) B.C. PANEL MOUNTING 2-1/16 [52.39] 2 [50.80] Ø5 [127.00] 1-1/4 [31.75] ø4-47/64 [120.25] 1/8 FEMALE NPT LOW PRESSURE CONNECTION Ø4 [101.60] FACE 5-1/2 [139.70] O.D. MOUNTING RING 5/8 [15.88] PANEL MAX 3/16 [4.76] 2-1/2 [63.50] 1/2 [12.70] 11/16 [17.46] 1/8 FEMALE NPT HIGH PRESSURE CONNECTION 30° 1-9/32 [32.54] 1/8 FEMALE NPT LOW PRESSURE CONNECTION 1-3/4 [44.45] 1/2 [12.70] 11/16 [17.
INSTALLATION LOCATION: Select a clean, dry location free from shock and vibration where temperature limits will not be exceeded. Distance from the transmitter to the receiver is limited only by total loop resistance. See ELECTRICAL CONNECTIONS. Tubing feeding pressure to the instrument can be practically any length required, but long lengths will increase response time slightly. POSITION: All standard models are calibrated for use in a vertical mounting position.
MOUNTING: The DH3 may be either panel (flush) mounted or surface mounted. Panel Mounting - Cut a 4-3/4˝ or 121 mm diameter hole in the panel and insert the unit from the front. Slip on the mounting ring with the stepped side facing rear. Next, fit the snap ring into the narrow groove at back edge of bezel. Thread four (6) 32 x 1-1/4˝ mounting screws into tapped holes in mounting ring and set it against snap ring. Tighten screws against rear of panel. See Figure B. SNAP RING GROOVE Ø4-3/4 [120.
For -SS Bezel Installation Provide a 4-9/16˝ opening in panel. Insert gage and secure with supplied mounting hardware. WIRING The DH3 uses a standard 15 pin male high density D-Sub connector available from most electronic distributors. A pre-wired 18˝ cable is included with each unit. See below table for cable color wiring information.
FRONT PANEL SP2 DESCRIPTOR SP1 DESCRIPTOR MULTIPLIER DESCRIPTOR VISABLE WITH SOME VELOCITY AND FLOW RANGES SP1 SP2 ALLO X1K 1.
SETTING SET POINTS AND ALARMS The SP/AL hot key provides direct access to the Set Point and Alarm MENU. The Set Point and Alarm MENUS that are displayed are based upon the Control (CtrL) SUB MENU. CONTROL MODE CONTROL MODE CONTROL MODE SP/AL SP/AL SP/AL SP/AL SP/AL SP/AL SP/AL SP/AL SP/AL SP/AL SP/AL SP/AL SP/AL Visible when mode = Visible when mode = Visible when mode = SET POINT ADJUSTMENT Adjusting the DH3 Set Points is quick and simple.
Menu Map MAIN MENUS SUB MENUS SETTINGS MENUS UNAVAILABLE FOR BI-DIRECTIONAL RANGES AND RANGES ABOVE 25 IN. W.C.
MAIN MENUS SUB MENUS CONTINUED E MENU SETTINGS
MAIN MENUS SUB MENUS SETTINGS Menus present only in pressure operation E MENU
Main Menu Selections (Upper Right Display Reads MENU ) SECr Security - Lock out access to Set Point and Alarm settings, or lock out access to all settings. OPEr Operation - Selection of Pressure, Velocity or Flow and corresponding engineering units. OUt Output - Select a Single Set Point, 2 Set Points, or a Set Point and an Alarm mode of operation. d.S Display - Monitor and adjust display related settings: Peak, Valley, display resolution, % output and dampening.
MAIN MENUS and SUB MENUS SECr (Security) MAIN MENU SECr is the only SUB MENU in the security MENU. When the security SUB MENU is selected, the present security level is displayed in the upper right hand display. To change the security level, adjust the number displayed to the number shown in the following table for the desired security level.
PrES (Pressure) SUB MENU For pressure measurement, the following units are available: NWC - Inches of water column FTWC - Feet of water column MMWC - Millimeters of water column CMWC - Centimeters of water column PSI - Pounds per square inch INHG - Inches of mercury Table 1 - Pressure Range vs. Available Units INWC FTWC MMWC CMWC PSI INHG .1000 2.540 .2540 .2500 6.350 .6350 .5000 12.70 1.270 1.000 25.40 2.540 2.500 .2083 63.50 6.350 .1839 5.000 .4167 127.0 12.70 .1806 .3678 10.00 .8333 254.0 25.40 .3613 .
FLO (Flow) SUB MENU For flow measurements the following units are available: SCFM - Standard cubic feet per minute M 3 H - Cubic meters per hour FLOr (Flow Range) SUB MENU LO - 99.99 x 1K flow range HI - 999.9 x 1K flow range Tables 3-6 show the flow ranges available, and the maximum duct size that can be set for each input range. FLOr = LO Table 3 RANGE IN WC 0.1 0.25 0.5 1 2.5 5 10 25 FLOr Maximum Duct Size (English) SFPM RANGE 99.99 x 1K 99.99 x 1K 99.99 x 1K 99.99 x 1K 99.99 x 1K 99.99 x 1K 99.
ArEA , DIA , XDIM and YDIM SUB MENUS These SUB MENUS become accessible if the instrument is set for flow. When measuring flow, the area of the duct must be specified. Tables 3 and 4 show the input range vs maximum flow and duct size. For a rectangular duct the maximum size is specified in square feet or meters. For a circular duct the maximum size is specified as the diameter. X, Y and circular dimensions are entered in feet with 0.01 foot resolution for FLOr = LO and 0.
CtrL (Control) SUB MENU 1SP - Single set point 2SP - Two fully independent set points SPAL - Single set point and alarm 1SP (SP1 Reverse or Direct Acting) SUB MENU DIR - Direct. Relay turns on with increasing pressure REV - Reverse.
The following alarm function SUB MENUS are activated when CtrL is set to SPAL : AL (Alarm Type) SUB MENU HI - High alarm LO - Low alarm HILO - For a high/low guardband type alarm ALARM ADJUSTMENT Alarm settings are dependent upon the selected alarm mode. The DH3 differential pressure controller alarm may be configured as a High Alarm, Low Alarm, or High/Low Alarm. Alarm settings are all absolute and may be set to anywhere within the range of the instrument.
AL0S (Alarm Output State) SUB MENU CL0S - Alarm relay contacts close upon alarm condition 0PEN - Alarm relay contacts open upon alarm condition ALrE (Alarm Reset) SUB MENU ONOF - Automatic reset HOLD - Manual reset. An alarm is reset by the RESET key on the front panel. AL.H (Low Alarm Inhibit) SUB MENU ON - Alarm inhibit is on OFF - Alarm inhibit is off If AL.H is selected ON, a low alarm condition is suspended upon power up until the process value passes through the alarm set point once.
rESO (Resolution) SUB MENU The DH3 is capable of displaying four digits of resolution. However, at very low pressures the instability of the pressure may cause fluctuations in the least significant digit causing the least significant digit to be of little value. Three digit resolution (3DIG ) can only be active when there is at least one digit to the right of a decimal. 3DIG - Set display for 3 digit resolution 4DIG - Set display for 4 digit resolution Pd.
MSP1 and MSP2 (Maintenance Set Point 1 & 2) SUB MENUS Adjust for the desired maintenance set points when the unit is placed in the maintenance mode. The deadband is fixed at 2% of full scale. To enter or leave the maintenance mode, press and hold the SP/AL for 8 seconds. ZERO and SPAN (Calibration of Zero and Span) SUB MENUS The lower display reads CAL in this mode. ZERO Calibration Note: For accurate calibration, do not apply any pressure when performing this function.
