Dwyer DHII User Manual

Bulletin B-31

Series DHII Digihelic®II Differential Pressure Controller

Specifications - Installation and Operating Instructions

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, IN 46360, U.S.A. Fax: [phone] e-mail: [e-mail]

Phone: [phone] www.dwyer-inst.com

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

PATT ERN

4X Ø3/16 [4.76]

CLEARANCE HOLES FOR

MOUNTING

3-17/64

[83]

4-1/8
[105]

!

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

STANDO FF

WIRING

TERMINALS

OPTIONAL A-438 BRACKET
MOUNTING DIAGRAM

1

WIRING TERMINAL ACCESS

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.

2

WIRING

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 specicationsspecications
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



Notes:

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.

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.

3

When wiring the instrument, you must follow industry standard practice for control and

SHIELDSHIELD

SHIELDSHIELD

TIETIE SHIELDSHIELD TOTO EAR THEARTH 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

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.

DIGIHELIC® II CONTROLLER RS485 WIRING

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
with a 1/2˝ wrench to prevent the fitting on the Digihelic®II Controller from turning.

4

®

II Controller

SP/ALSP/AL

M

ENUMENU

EE

RSTRST

KEY FUNCTIONS

SP1SP1

SP2SP2

A

LHIALHI

A

LLOALLO

SCFMSCFM

99.9999.99

X1K

S

P/ALSP/AL

RSTRST

MENUMENU

EE

MULTIPLIERMULTI P L IE R DESCRIPTORDESCRIPTOR
VISIBLEVISIBLE WITHWITH SOMESOME VELOCIT YVELOCIT Y
ANDAND FLOWFLOW RANGESRANGES

FRONTFRONT PANELPANEL

UNITSUNITS

PROCESSPROCESS
VALUEVALUE

HIGHHIGH ALARMALARM
DESCRIPTORDESCRIPTOR

LOWLOW ALARMALARM
DESCRIPTORDESCRIPTOR

S

P1SP1

DESCRIPTORDESCRIPTOR

SP2SP2
DESCRIPTORDESCRIPTOR

HOME POSITION FUNCTION

Sequences the display

SP/AL

through SET POINT and
ALARM settings
Allows access to the menus

MENU

UP

ARROW

DOWN

AR

RO

W

Displays full scale range of

ENTER

RESET

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.

5