Dwyer Instruments DHII Digihelic II Series Specifications-installation And Operating Instructions
Bulletin B-31
Series DHII Digihelic®II Differential Pressure Controller
Specifications - Installation and Operating Instructions
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, IN 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
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1
DIMENSIONS
!
1-1/2
[38.35]
1-45/64
[43.18]
2-23/64
[59.94]
1
-31/64
[37.62]
4-23/32
[
120]
4-23/32
[120]
3
-7/16
[
87.12]
1-5/16
[33]
1-17/32
[
38.61]
45/64
[17.78]
1-1/16
[26.97]
1-7/8
[47.5]
1-45/64
[43.18]
MOUNTING HOLE
PATTERN
4X Ø3/16 [4.76]
CLEARANCE HOLES FOR
MOUNTING
3-17/64
[83]
4-1/8
[105]
WIRING TERMINAL ACCESS
!
5-7/32
[132.56]
4-9/64
[105.17]
#8 LOCK WASHER
8-36 FLAT HEAD SCREWS
D
O NOT REMOVE
THESE SCREWS
TO GAIN ACCESS TO WIRING TERMINALS,
REMOVE THESE TWO SCREWS AND “FLIP” DISPLAY
90° DO NOT REMOVE THE SCREWS WITH]
POWER APPLIED TO INSTRUMENT
HINGED
STAND OFF
WIRING
TERMINALS
OPTIONAL A-438 BRACKET
MOUNTING DIAGRAM
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SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Housing Material: Aluminum, glass.
Accuracy: ±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 in. w.c. = 2 psi
5˝: 5 psi; 10˝: 5 psi; 25˝: 5 psi; 50˝: 5 psi; 100˝: 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:
High Voltage Power = 100 to 240 VAC, 50 to 400 Hz or 132 to 240 VDC;
Low Voltage Power = 24 VDC ±20%.
Power Consumption:
Low Voltage Power = 24 VDC - 130 mA max.
High Voltage Power = 100 to 240 VAC, 132 to 240 VDC - 7VA 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: 4 digit backlit LCD 0.6˝ height. LED indicators for set point and alarm status.
Electrical Connections: Euro type removeable terminal blocks with watertight conduit fittings for
1/2˝ watertight conduit.
Process Connections: 1/8 female NPT.
Enclosure Rating: Designed to meet NEMA 4 (IP66).
Mounting Orientation: Mount unit in vertical plane.
Size: 4.73˝ x 4.73˝ x 3.43˝ (120 mm x 120 mm x 87.1 mm).
Weight: 2 lb 10 oz (1.19 kg).
Serial Communications: Modbus®RTU, RS485, 9600 Baud.
Agency Approvals: UL & CE.
SWITCH SPECIFICATIONS
Switch Type: 2 SPDT relays.
Electrical Rating: 8 Amps at 240 VAC resistive.
Set Point Adjustment: Adjustable via keypad on face.
Modbus®is a registered trademark of Schnieder Automation.
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Notes:
1. The instrument may be powered from the AC line or 24 VDC. Do not wire AC line terminals 1-2 on
the lower board and 24 VDC terminals 4-5 on the upper board at the same time or damage to the
unit will result.
2. For supply connections, wire in accordance with an equivalent national standard or code. Use
copper conductors only rated for at least 75°C.
3. Terminals on upper board are rated CLASS 2.
4. ISOLATION:
Relays - 1500 VAC to all other inputs and outputs.
AC Line Power (terminals 4-5) - 1500 VAC to all other inputs and outputs.
RS485 output - 500 VAC to all other CLASS 2 wiring.
The 24 VDC Power, 4-20 mA transmitter, and Remote Reset Switch share a common
ground.
5. The Remote Reset Switch must be a dry contact switch.
6. Shielded cable is required for RS485 wiring.
WIRING
WARNING
If Digihelic®II Controller is powered by 24 VDC, the device receiving the 4-20 mA
transmitter output MUST NOT share a common ground with the 24 VDC supply or
damage to the Digihelic®II Controller will result.
11 22 33 44
55
66
7
7
88
11
2
2
3
3 44 55 66
77
88
CONNECTORCONNECTOR ONON
LOWERLOWER BOARDBOARD
C
ONNECTORCONNECTOR ONON
UPPERUPPER BOARDBOARD
100-240100-240 VACVAC oror
1
32-240132-240 VDCVDC POWERPOWER
NOTENOTE 11
3/83/8 AA 250vac250vac
M
EDIUMMEDIUM LAGLAG
N
/CN/C
N/CN/C
N/ON/O
N/ON/O
C
C
CC
SP1SP1
RELAYRELAY
SP2SP2 OROR
ALARMALARM
R
ELAYRELAY
A-A-
B
+B+
R
S485RS485 SERIALSERIAL
COMMUNICATIONCOMMUNICATION
++
-
-
2424 VDCVDC POWERPOWER
NOTENOTE 11
R
EMOTEREMOTE RESETRESET
S
WITCHSWITCH
DeviceDevice receivingreceiving 4-20mA4-20mA
signal.signal. CheckCheck specicationsspecications
o
fof thisthis devicedevice forfor inputinput loadload
r
esistance.resistance. TypicalTypical 250250 toto
600600 OHMS,OHMS, 900900 OHMSOHMS
maximum.maximum.
++
--
4-20mA4-20mA
TRANSMITTERTRANSMITTER
OUTPUTOUTPUT
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When wiring the instrument, you must follow industry standard practice for control and
protection against Electro-Static Discharge (ESD). Failure to exercise good ESD practices
may cause damage to the control.
WIRING
1. Remove cover.
2. To gain access to the wiring terminal blocks, remove the upper and lower screws toward the center
of the display board, and then flip the display board up at a 90° angle.
3. Wire to the two terminals blocks as shown in the wiring diagram.
Note: Depending on the application, it may be only necessary to wire to the smaller terminal block on
the upper board. In that case one of the liquid tight fittings may be removed and replaced with the
provided rubber plug.
4. For liquid tight applications, use only 1/2˝ liquid tight conduit.
5. When wiring is complete, reverse steps 2 and 1. Make sure the cover is properly tightened to the
housing.
INSTALLATION
Mount the instrument in a location that will not be subject to excessive temperature, shock or vibration.
Pressure Connections
Use 1/8 male NPT fittings. When tightening fittings, grasp the brass fitting on the Digihelic
®
II Controller
with a 1/2˝ wrench to prevent the fitting on the Digihelic®II Controller from turning.
DIGIHELIC® II CONTROLLER RS485 WIRING
SHIELDSHIELD
SHIELDSHIELD
TIETIE SHIELDSHIELD TOTO EARTHEARTH GROUNDGROUND
TOTO RS232RS232 TOTO
RS485RS485 CONVERTERCONVERTER
120120 OHMOHM
RESISTORRESISTOR
L
ASTLAST UNITUNIT ONON RS485RS485 BUSSBUSS
WIREWIRE NUTNUT
DIGIHELICDIGIHELIC -- RS485RS485 WIRINGWIRING TOTO DAISYDAISY CHAINCHAIN INSTRUMENTSINSTRUMENTS ONON THETHE RS485RS485 BUSSBUSS
UPUP TOTO 128128 UNITSUNITS MAYMAY BEBE DAISYDAISY CHAINEDCHAINED
THETHE 120120 OHMOHM RESISTORRESISTOR
ISIS USUALLYUSUALLY ONLYONLY
NECESSARYNECESSARY FORFOR LONGLONG
WIREWIRE RUNS.RUNS.
1
1 22 33 44
55
66
7
7
88
1
1
2
2
3
3 44 55 66
7
7
88
CONNECTORCONNECTOR ONON
LOWERLOWER BOARDBOARD
CONNECTORCONNECTOR ONON
U
PPERUPPER BOARDBOARD
11 22 33 44
5
5
6
6
77
8
8
11
22
33 44 55 66
77
8
8
CONNECTORCONNECTOR ONON
LOWERLOWER BOARDBOARD
CONNECTORCONNECTOR ONON
U
PPERUPPER BOARDBOARD
1
1 22 33 44
55
6
6
77
8
8
1
1
22
3
3 44 55 66
7
7
88
CONNECTORCONNECTOR ONON
LOWERLOWER BOARDBOARD
CONNECTORCONNECTOR ONON
U
PPERUPPER BOARDBOARD
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SP/ALSP/AL
M
ENUMENU
EE
RSTRST
HOME POSITION FUNCTION
Sequences the display
through SET POINT and
ALARM settings
Allows access to the menus
Displays full scale range of
unit
Clears or resets an Alarm
(alarm set for manual reset)
MAIN MENU FUNCTION
Return to home position
Return to home position
Sequences through
menus
Sequences through
menus
Enter into SUB MENU
SUB MENU FUNCTION
Return to home position
Return to previous
menu
Increments a value
Decrements a value
Changes a value or
setting. Press ENTER
and display will blink.
Adjust with UP or
DOWN arrows. Press
ENTER to store. Display
will stop blinking.
Peak/Valley SUB
MENU resets display
to present value.
SP/AL
MENU
UP
ARROW
ENTER
RESET
KEY FUNCTIONS
SP1SP1
SP2SP2
A
LHIALHI
A
LLOALLO
SCFMSCFM
99.9999.99
X1K
S
P/ALSP/AL
RSTRST
MENUMENU
EE
MULTIPLIERMULTI P L I ER DESCRIPTORDESCRIPTOR
VISIBLEVISIBLE WITHWITH SOMESOME VELO CI T YVELOCIT Y
ANDAND FLOWFLOW RANGESRANGES
FRONTFRONT PANELPANEL
UNITSUNITS
PROCESSPROCESS
VALUEVALUE
HIGHHIGH ALARMALARM
DESCRIPTORDESCRIPTOR
LOWLOW ALARMALARM
DESCRIPTORDESCRIPTOR
S
P1SP1
DESCRIPTORDESCRIPTOR
SP2SP2
DESCRIPTORDESCRIPTOR
DOWN
ARROW
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