Dwyer Instruments DH Digihelic DH-008 Installation and operating instructions

Bulletin B-32
Series DH Digihelic®Differential Pressure Controller
Specifications - Installation and Operating Instructions
DWYER INSTRUMENTS, INC. Phone: [phone] www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, IN 46361, U.S.A. Fax: [phone] e-mail: [e-mail]
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DIMENSIONS
1-3/4
[44.45]
4-1/2
[114.30]
1/2
[12.70]
4-1/2
[114.30]
3-19/32
[91.28]
1-15/16
[49.21]
3-25/32
[96.04]
Face Designed to Meet NEMA 4X (IP66)
PANEL CUT OUTS
Horizontal
3.620 in. + 0.032 - 0.0
(92.00 mm + 0.8 - 0.0)
1.772 in. + 0.024 - 0.0
(45.00 mm + 0.6 - 0.0)
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SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Housing Material: ABS plastic, UL approved 94-V-0.
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 LCD 0.4˝ height LED indicators for set point and alarm status.
Electrical Connections: Screw terminals.
Process Connections: Compression fitting for use with 1/8˝ ID tubing x 1/4˝ OD
tubing (3.175 mm ID x 6.35 mm OD).
Enclosure Rating: Face designed to meet NEMA 4X (IP66).
Mounting Orientation: Mount unit in horizontal plane.
Size: 1/8 DIN. Panel Cutout: 1.772 x 3.620 in (45 x 92 mm).
Weight: 14.4 oz (408 g).
Serial Communications: Modbus® Protocol RTU, RS485, 9600 Baud.
Agency Approvals: UL Listed, CUL Listed File No. E83725
CE EMC and Low Voltage Directives:
EN61000-4-2
EN61000-4-3*
EN61000-4-4
EN61000-4-5
EN61000-4-6
EN61000-4-11
EN55011
EN601010
* Models DH-001 through DH-004, DH-011 through DH-014 pass criteria B. All others pass criteria A.
Switch SPECIFICATIONS
Switch Type: 2 SPDT relays.
Electrical Rating: 8 Amps at 240 VAC resistive.
Set Point Adjustment: Adjustable via keypad on face.
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WIRING
2020 1919 1818 1717 1616 1515 1414 1313 1111 1212
1010 9 8 7654321
21
21
2222
2323
2424
C
C
N/CN/C
N/CN/C N/ON/O
N/O
N/O
SP1
RELAY
SP1
RELAY
SP2 OR
ALARM
RELAY
SP2 OR
ALARM
RELAY
3/8A 250VAC
MEDIUM LAG
3/8A 250VAC
MEDIUM LAG
100-240 VAC or
132-240 VDC POWER
100-240 VAC or
132-240 VDC POWER
NOTE1NOTE1
A
B_
+
RS485 SERIAL
COMMUNICATION
RS485 SERIAL
COMMUNICATION
_
+
24 VDC POWER24 VDC POWER
REMOTE RESET
SWITCH
REMOTE RESET
SWITCH
NOTE 1
NOTE 1
4-20mA
transmitter
output
4-20mA
transmitter
output
Device receiving 4-20mA
signal. Check specifications
of this device for input load
resistance. Typical 250 to
600 OHMS, 900 OHMS
maximum
signal. Check specifications
of this device for input load
resistance. T
600 OHMS, 900 OHMS
maximum _
_
+
+_
+
High Pressure PortHigh Pressure Port Low
Pressure
Port
Low
Pressure
Port
NOTES:
1. The instrument may be powered from the AC line or 24 VDC. Do not wire AC
line terminals 4-5 and 24 VDC terminals 14-15 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 11-15, 18 and 20 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®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®will result.

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It is not necessary to remove the control chassis from the housing for
installation. If the control chassis is removed from the housing, 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 to housing terminals while chassis is removed may cause dis-
tortion of the internal connector and possible damage to the connec-
tor when the chassis is reinstalled. It is strongly recommended that
the control housing be wired with the chassis installed.
INSTALLATION
Mount the instrument in a location that will not be subject to excessive temperature,
shock or vibration. All models are designed for mounting in an enclosed panel.
Select the position desired for the instrument on the panel. Prepare the panel by cut-
ting and deburring the required opening.
From the front of the panel, slide the instrument through the cut out. The housing
gasket should be against the housing flange before installing.
From the rear of the panel slide the mounting collar over the housing. Hold the hous-
ing with one hand and using the other hand, push the collar evenly against the panel
until the springs are compressed. The ratchets will hold the mounting collar and
housing in place.
C

20
20
19
19
18
18
17
17
16
16
15
15
14
14
13
13
11
11
12
12
10
10 9 8 7654321
21
21
22
22
23
23
24
24
20
20
19
19
18
18
17
17
16
16
15
15
14
14
13
13
11
11
12
12
10
10 9 8 7654321
21
21
22
22
23
23
24
24
20
20
19
19
18
18
17
17
16
16
15
15
14
14
13
13
11
11
12
12
10
10 9 8 7654321
21
21
22
22
23
23
24
24
___
+++
SHIELD
SHIELD
SHIELD
SHIELD
TIE SHIELD TO EARTH GROUND
TIE SHIELD TO EARTH GROUND
TO RS232 TO
RS485 CONVERTER
TO RS232 TO
RS485 CONVERTER
120 OHM
RESISTOR
120 OHM
RESISTOR
LAST UNIT ON RS485 BUSS
LAST UNIT ON RS485 BUSS
WIRE NUT
WIRE NUT
- RS485 WIRING TO DAISY CHAIN INSTRUMENTS ON THERS485 BUSS
UP TO 128 UNITS MAY BE DAISY CHAINED
THE 120 OHM RESISTOR
IS USUALLY ONLY
NECESSARY FOR LONG
WIRE RUNS.
THE 120 OHM RESISTOR
IS USUALLY ONLY
NECESSARY FOR LONG
WIRE RUNS.
DIGIHELIC® CONTROLER RS485 WIRING
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SP1
SP1
SP2
SP2
ALHI
ALHI
ALLO
ALLO
SP/AL
SP/AL
RST
RST
MENU
MENU E
X1K
X1K
MULTIPLIER DESCRIPTOR
MULTIPLIER DESCRIPTOR
VISIBLE WITH S
VISIBLE WITH SO
ME VELOCITY
ME VELOCITY
AND FLOW RANGE
AND FLOW RANGE
FRONT PANEL
FRONT PANEL
PRESSURE
VALUE
PRESSURE
VALUE
UNITS
UNITS
ALARM
ALARM
DESCRIPTOR
DESCRIPTOR
SP2
DESCRIPTOR
SP2
DESCRIPTOR
SP1
DESCRIPTOR
SP1
DESCRIPTOR
SP/ALSP/AL
MENU
E
RST
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SP/AL
MENUMENU
E
RST
PAGE 1 OF 12
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SP/AL
MENU
E
RST
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SP/AL
MENU
E
RST
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SP/AL
MENU
E
RST
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SP/AL
MENU
E
RSTRST
PAGE 1 OF 12
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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
DOWN
ARROW
ENTER
RESET
KEY FUNCTIONS
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SETTING SET POINTS AND ALARMS
The 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.
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
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
Visible when
Visible when
Visible when
Visible when
Visible when
mode =
mode =
mode =
mode =
mode =
mode =
CONTROL MODE
CONTROL MODE
CONTROL MODE
CONTROL MODE
CONTROL MODE
CONTROL MODE
SET POINT ADJUSTMENT
Adjusting the Digihelic®Controller Set Points is quick and simple. Instead of setting
a set point and deadband, simply adjust
SP1H or SP2H for the desired relay turn
on point, and then adjust
SP1L or SP2L for the desired relay turn off point.
PRESSUREPRESSURE
0
0TIME
TIME
0.20.2
0.40.4
0.60.6
0.80.8
1.0
(in. w.c.)
In the above graph, an instrument with a 1.0˝ range would have the SP1 relay turn
on at 0.8˝ and off at 0.4˝.
SP1H sets the relay turn on point, and SP1L sets the relay
turn off point. The relays outputs normally function in the direct acting mode, which
means the relays turn on with an increase in pressure. SP1 may be configured to act
as a reverse acting relay (refer to the 1SP SUB MENU setting, page 15). When set
for reverse acting,
SP1H sets the relay turn OFF point, and SP1L sets the relay turn
ON point. SP2 is always direct acting.
SP/ALSP/AL
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MENU MAP
MENU MAP
CONTINUED
CONTINUED
SETTINGS
SETTINGS
MAIN MENUS SUB MENUS
MENUS
UNAVAILABLE
FOR
BI-DIRECTIONAL
RANGES AND
RANGES ABOVE
25 IN. W.C.
SP/AL
MENU
E
RST
PAGE 1 OF 12
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SP/AL
MENU
E
RST
PAGE 1 OF 12
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SP/AL
MENU
E
RST
PAGE 1 OF 12
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SP/AL
MENUMENU
E
RST
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CONTINUED
CONTINUED
SETTINGS
SETTINGS
MAIN MENUS SUB MENUS
SP/AL
MENU
E
RST
PAGE 1 OF 12
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SP/AL
MENU
E
RST
PAGE 1 OF 12
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SP/AL
MENU
E
RST
PAGE 1 OF 12
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SP/AL
MENUMENU
E
RST
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MAIN MENUS SUB MENUS SETTINGS
Menus present only
in pressure operation
SP/AL
MENU
E
RST
PAGE 1 OF 12
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SP/AL
MENU
E
RST
PAGE 1 OF 12
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SP/AL
MENU
E
RST
PAGE 1 OF 12
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SP/AL
MENUMENU
E
RST
PAGE 1 OF 12
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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.
AdU Advanced functions - Modify advanced function parameters, transmitter
output scaling, Modbus®Protocol communication settings,
Maintenance Set Point settings and calibration.
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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.
The password values shown in the table cannot be altered, so retain a copy
of these pages for future reference.
OPEr (Operation) MAIN MENU
The OPEr MENU selects the measurement type of the instrument.
The SUB MENUS are:
PrES - Pressure KFAC - K Factor XDIM - X Dimension
UEL - Velocity ArEA - Area YDIM - Y Dimension
FLO - Flow DIA - Diameter
If the instrument is set for Velocity, the
OPEr MENU will have an additional KFAC
SUB MENU. If the instrument is set for Flow, the OPEr MENU will have additional
KFAC and ArEA SUB MENUS. These will be discussed under Velocity and Flow.
When scrolling through the
OPEr SUB MENUS, the measurement type the unit is
currently set for will show the units in the upper right display. The other measure-
ment types will have a blank upper right display.
Security Level
Displayed
1
2
3
4
Access
All menus access
Menu Access
SP/AL Locked
SP/AL Access
Menus Locked
All settings locked
Password
Value to Enter
10
70
90
111
Units visible, so unit
is presently set to
measure pressure
is presently set to
measure pressure
Units not visibleUnits not visible Units not visibleUnits not visible
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PrES (Pressure) SUB MENU
For pressure measurement, the following units are available:
Table 1 Pressure Range vs. Available Units
INWC
.1000
.2500
.5000
1.000
2.500
5.000
10.00
25.00
50.00
100.0
FTWC
.2083
.4167
.8333
2.083
4.167
8.333
MMWC
2.540
6.350
12.70
25.40
63.50
127.0
254.0
635.0
1270
2540
CMWC
.2540
.6350
1.270
2.540
6.350
12.70
25.40
63.50
127.0
254.0
PSI
.1806
.3613
.9032
1.806
3.613
INHG
.1839
.3678
.7356
1.839
3.678
7.356
MMHG
.1868
.4671
.9342
1.868
4.671
9.342
18.68
46.71
93.42
186.8
MBAR
.2491
.6227
1.245
2.491
6.227
12.45
24.91
62.27
124.5
249.1
PA
24.91
62.27
124.5
249.1
622.7
1245
2491
6227
KPA
.1245
.2491
.6227
1.245
2.491
6.227
12.45
24.91
HPA
.2491
.6227
1.245
2.491
6.227
12.45
24.91
62.27
124.5
249.1
OZIN
.1445
.2890
.5780
1.445
2.890
5.780
14.45
28.90
57.80
UEL (Velocity) SUB MENU
For velocity measurement, the following units are available:
SFPM - Standard feet per minute
M/S - Meters per second
Table 2 Available Velocity Ranges
NOTE: Air velocity and flow readings are based upon standard dry air conditions with an
ambient temperature of 70°F and a barometric pressure of 29.92 INHG.
INPUT RANGE INWC
0 - 0.1
0 - 0.25
0 - 0.5
0 - 1
0 - 2.5
0 - 5
0 - 10
0 - 25
SFPM RANGE
0 - 1266
0 - 2002
0 - 2832
0 - 4004
0 - 6332
0 - 8954
0 - 12.66 x IK
0 - 20.02 x IK
M/S RANGE
0 - 6.431
0 - 10.17
0 - 14.39
0 - 20.35
0 - 32.17
0 - 45.48
0 - 64.33
0 - 101.7
INWC - 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
MMHG - Millimeters of mercury
MBAR - Millibar
PA - Pascal
KPA - Kilopascals
HPA - Hectopascals
OZIN - Ounce inches
NOTE: OVFL (over flow) or UnFL (under flow) will appear when the ranges have been
exceeded above or below full scale by 2%.
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FLO (Flow) SUB MENU
For flow measurements the following units are available:
SCFM - Standard cubic feet per minute
M^3H - Cubic meters per hour
FLO r (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.
Table 3
FLOr = LO Maximum Duct Size (English)
RANGE
IN WC
0.1
0.25
0.5
1
2.5
5
10
25
SCFM
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
99.99 x 1K
99.99 x 1K
MAX. DUCT
SIZE, SQ. FT.
78.9
49.9
35.3
24.9
15.7
11.1
7.8
4.9
KFAC SUB MENU
KFAC K Factor - becomes accessible if the instrument is set for Velocity or Flow.
When the Digihelic®Controller is used with a pitot tube, the manufacturer
may specify a K Factor. The adjustment range is 0.01 to 2.00. The factory
setting is 1.
Table 4
FLOr = HI Maximum Duct Size (English)
RANGE
IN WC
0.1
0.25
0.5
1
2.5
5
10
25
SCFM
RANGE
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
MAX. DUCT
SIZE, SQ. FT.
789.8
499.5
353.1
249.7
157.9
111.7
78.9
49.9
Table 5
FLOr = LO Maximum Duct Size (Metric)
RANGE
IN WC
0.1
0.25
0.5
1
2.5
5
10
25
Mˆ3/Hr
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
99.99 x 1K
99.99 x 1K
MAX. DUCT
SIZE Mˆ2
4.32
2.73
1.93
1.37
0.86
0.61
0.43
0.27
Table 6
FLOr = HI Maximum Duct Size (Metric)
RANGE
IN WC
0.1
0.25
0.5
1
2.5
5
10
25
Mˆ3/Hr
Range
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
999.9 x 1K
MAX. DUCT
SIZE, Mˆ2
43.19
27.31
19.3
13.64
8.63
6.10
4.31
2.73
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ArEA , DIA , XDIM and YDIM SUB MENUS
These SUB MENUS become accessible if the instrument is set for flow. When meas-
uring 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 res-
olution for
FLOr = LO and 0.1 foot resolution for FLOr = HI , or entered in millimeters
with 1 millimeter resolution.
ArEA - Area, select CIR for a circular duct or RECT for a rectangular
duct. If a circular duct is selected, the
DIA SUB MENU will be activated. If a
rectangular duct is selected, the
XDIM and YDIM SUB MENUS will be acti-
vated.
DIA - Diameter, enter the diameter of a duct
XDIM - Enter the “X” dimension of a duct
YDIM - Enter the “Y” dimension of a duct
OUt (Output) MAIN MENU
The OUt MENU selects the output type of the instrument. The SUB
MENUS are:
CtrL - Control type ALrE - Alarm reset, manual or auto
ISP - SP1 reverse or direct acting AL.H - Alarm inhibit
AL - Alarm type ALDL - Alarm delay
Y
X
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0
100
Process
Reverse Acting
Time
SPH
SPL
Relay Inactive
Relay Active
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. Relay turns on with decreasing pressure
0
100
Process
Direct Acting
Time
SPH
SPL
Relay Inactive
Relay Active
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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 Digihelic®
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. The dead bands of the alarms are fixed at 1% of full scale.
MIN. PRESSURE MAX. PRESSURE
ALHI
Relay OFF Relay ON
HIGH ALARM FUNCTION
MIN. PRESSURE MAX. PRESSURE
ALLO
Relay ON Relay OFF
LOW ALARM FUNCTION
MIN. PRESSURE MAX. PRESSURE
ALLO
Relay ON Relay OFF Relay ON
HIGH/LOW ALARM
FUNCTION
ALHI
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ALrE (Alarm Reset) SUB MENU
ONOF - Automatic reset
HOLD - Manual reset. An alarm is reset by the RESET key on the front
panel, or an external reset switch.
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.
ALDL (Alarm Delay) SUB MENU
Sets the amount of time an alarm condition must be continuously met before
the alarm condition is recognized. The alarm delay is adjustable from 0-3600
seconds.
d.S (Display) MAIN MENU
PEAK - Peak value rESO - Resolution
VALy - Valley value Pd.S - Process display
ZERO - Zero DAMP - Dampening level
PEAK (Peak) SUB MENU
The Peak feature stores the highest pressure reading the instrument has
measured since the last reset or power up. At power up
PEAK is reset
to the present pressure reading. To manually reset the PEAK value,
press the RESET key while in the
PEAK SUB MENU.
VALy (Valley) SUB MENU
The valley feature stores the lowest pressure reading the instrument has
measured since the last reset or power up. At power up
VALy is reset to
the present pressure reading. To manually reset the VALy value, press the
RESET key while in the
VALy SUB MENU.
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rESO (Resolution) SUB MENU
The Digihelic®Controller 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.S (Process Display) SUB MENU
STD - Display reads pressure, velocity, or flow values
PCT - Display reads % of full scale value
When the display is reading percent,
PCT is displayed in the upper right of
the display. The percent display is only available in pressure operation.
DAMP (Dampening) SUB MENU
Adjust from 1-16
Dampening stabilizes the display from instabilities due to things such as
vibration and excessive pressure fluctuations. The dampening setting adjusts
the amount of readings that are averaged for each display update. Adjust
the dampening value until the display reads a stable value for the application.
AdU (Advanced) MAIN MENU
POL - Process output low ADDR - Modbus® Protocol address
POH - Process output high WR - Modbus®Protocol write enable/disable
MSP1 - Maintenance set point 1 ZERO - Zero calibration
MSP2 - Maintenance set point 2 SPAN - Span calibration
POL and POH (Process Output Low and High) SUB MENUS
This feature is used in pressure operation only.
Process output low and high are used to scale the 4-20 mA output. Set
POL to the desired display reading for 4mA output, and set POH to the
desired display reading for 20 mA output. POH must be higher than POL .
POL may be adjusted 2% BELOW minimum scale up to POH . POH may
be adjusted from
POL to 2% ABOVE maximum scale.
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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 for 8 seconds.
ADDR (Modbus®Protocol Address ) SUB MENU
Modbus®communication instrument address. Set from 1 to 247. This num-
ber must match the address number used by the host computer.
To obtain the Digihelic®Controller Modbus®register list please visit
www.dwyer-inst.com
See page 4 for wiring diagram.
WR (Modbus®Write Protect) SUB MENU
d.S - Disables write commands from Modbus®. Protocol can only read
information from the instrument.
En - Enable write commands from Modbus® Protocol. Modbus®can read
information from and write information to the instrument.
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.
With the display reading
ZERO , press the ENTER key. The upper display will
blink. Press ENTER again to complete the zeroing of the instrument or press
the
MENU key to cancel.
SPAN Calibration
With the display set to SPAN , apply full scale pressure to the unit. Press the
ENTER key. The upper display will blink. Press ENTER again to complete the
calibration or press the
MENU key to cancel.
SP/ALSP/AL
MENU
E
RST
PAGE 1 OF 12
8/25/03
©Copyright 2009 Dwyer Instruments, Inc. Printed in U.S.A. 7/09 FR# 443246-00 Rev. 4
DWYER INSTRUMENTS, INC. Phone: [phone] www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, IN 46361, U.S.A. Fax: [phone] e-mail: [e-mail]
Modbus®is a registered trademark of Schnieder Automation and Company.
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