Dwyer Instruments DHC-202, DHC-203, DHC-008, DHC-002, DHC-204 User manual

...
Series DHC Digihelic® Differential Pressure Controller
[34.93]
53/64
HIGH
[42.34]
®
Specications - Installation and Operating Instructions
Bulletin P-DHC
[20.96]
1-3/8
The Series DHC Digihelic® Differential Pressure Controller is a 3-in-1 instrument possessing a digital display gage, control relay switches, and a transmitter with both current and voltage outputs. Combining these 3 features allows the reduction of several instruments with one product, saving inventory, installation time, and cost. The Series DHC Digihelic
pressure, velocity, and volumetric ow applications reading in several commonly
used engineering units with optional unidirectional or bidirectional ranges. These units achieve a 1.5% or better accuracy on extremely low ranges, and 0.5% accuracy
for ranges at or above 1 in w.c. Calibration can be performed in the eld, making
maintaining its accuracy more manageble. Additionally, the Series DHC Digihelic differential pressure controller includes 2 SPDT control relays with adjustable deadbands. Programming the unit is simple using the built-in menu. With scalable 4-20 mA, selectable voltage process outputs, and selectable Modbus
communication, this controller can easily t into your application.
INSTALLATION
Select a clean, dry location that is 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 WIRING section. The tubing feeding pressure to the instrument can be practically any length required, but longer lengths will slightly increase response time.
All standard models are calibrated for use in a vertical mounting position. The DHC will perform properly when mounted at any angle but should be zeroed before use.
Pressure Connections
For installation convenience, there are two sets of 1/8˝ female NPT pressure ports; one set is located on the back of the unit and the other is located on the side. Be sure
to seal the unused ports with the included pipe plugs (accessory A-330).
Positive Pressure: Connect tubing to the HIGH PRESSURE port (indicated with a “+” sign) and vent the LOW PRESSURE port (indicated with a “-” sign) to atmosphere.
Negative (Vacuum) Pressure: Connect tubing to the LOW PRESSURE port (indicated with a “-” sign) and vent the HIGH PRESSURE port (indicated with a “+” sign) to atmosphere. When operating this device in a dusty environment, install
an optional A-331 lter vent plug into the vented port to keep interior clean.
Differential Pressure: Connect tubing from the higher source to the HIGH PRESSURE port (indicated with a “+” sign) and from the lower source to the LOW PRESSURE port (indicated with a “-” sign).
®
differential pressure controller is the ideal instrument for
1/8 FEMALE NPT HIGH
PRESSURE CONNECTION
1 [25.40]
1/2 [12.70]
®
or BACnet
PRESSURE
PORT
1 [25.40]
1/8 FEMALE NPT LOW
PRESSURE CONNECTION
3x Ø3/16 [4.77] HOLES EQUALLY SPACED ON A 4-1/8 [104.78] B.C.
SURFACE MOUNTING
SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory. Housing Material: Polycarbonate. Accuracy: ±0.5% FSO for all ranges, except 0.5 in w.c. @ ±1% FSO, and ranges at
or below ±0.25 in w.c. @ ±1.5% FSO.
Stability: < ±1% / year FSO. Pressure Limits: Ranges > 1 in w.c.: 6 psi max operation, 6 psi burst; Ranges ≤ 1
in w.c.: 3.6 psi max operation, 6 psi burst.
®
Temperature Limits: -4 to 158°F (-20 to 70°C). Thermal Effects: .02% FS / °F (.036% FS / °C). Power Requirements: 12-28 VDC or 12-28 VAC 50 to 400 Hz. Power Consumption: 3 VA max. Output Signal: 4-20 mA (4-wire); 0-10 V, 0-5 V, 1-5 V, and 2-10 V (4-wire). Communication: BACnet MS/TP or Modbus Supported Baud Rate: 9600, 19200, 38400, 57600, 76800, 115200. Device Load: 1/8 unit load. Zero and Span Adjustments: Accessible via menus. Response Time: 400 ms (damping set to 0). Display: Backlit LCD display, LED setpoint indicators.
Electrical Connections: 15 pin male high density D-sub connection. 18˝ (46 cm)
cable with 15 conductors included.
Process Connections: 1/8˝ female NPT ports on side and back. Enclosure Rating: NEMA 4X (IP66).
Mounting Orientation: Not position sensitive.
Size: 5˝ OD (127 mm) x 1.9˝ (48 mm) deep. Weight: 8.8 oz (250 g).
Compliance: BTL, CE.
SWITCH SPECIFICATIONS Switch Type: 2 SPDT relays.
Electrical Rating: 1 A @ 30 VAC/VDC.
Set Point Adjustment: Accessible via menus.
MODEL CHART Model Range Model Range DHC-002 DHC-003 DHC-004 DHC-006 DHC-008 DHC-009 DHC-010 DHC-011 DHC-012 DHC-202 DHC-203 DHC-204 DHC-206
0.25 in w.c.
0.5 in w.c. 1 in w.c.
2.5 in w.c. 5 in w.c. 10 in w.c. 25 in w.c. 50 in w.c. 100 in w.c. ±0.25 in w.c. ±0.5 in w.c. ±1 in w.c. ±2.5 in w.c.
LOW
PRESSURE
PORT
1/2 [12.70]
DHC-208 DHC-209 DHC-053 DHC-055 DHC-056 DHC-253 DHC-255 DHC-256 DHC-082 DHC-084 DHC-282 DHC-284
1-43/64
®
RTU.
±5 in w.c. ±10 in w.c. 60 Pa 125 Pa 250 Pa ±60 Pa ±125 Pa ±250 Pa 6 mm w.c. 25 mm w.c. ±6 mm w.c. ±25 mm w.c.
15/64 [5.84]
Ø5 [127.00]
DWYER INSTRUMENTS, INC.
P.O. BOX 373 MICHIGAN CITY, INDIANA 46360, U.S.A.
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www.GlobalTestSupply.com
Phone: 219-879-8000
Fax: 219-872-9057
www.dwyer-inst.com
e-mail: info@dwyermail.com
MOUNTING
1-1/2 [38.10]
7/8 [22.23]
1 [25.40]
1 [25.40]
2X Ø5/8 [15.88]
The DHC may be either panel (ush) mounted or surface mounted.
Panel Mounting Including -SS Bezel:
1. Cut a 4-9/16˝ (116 mm) diameter hole in the panel.
2. Insert gage and secure in place with provided screws and mounting lugs as shown in Figure 1.
Surface Mounting
1. Use the drill template (Figure 4 on the next page) on the front of the desired
mounting surface. Provide three 3/16˝ diameter holes in panel on a 4-1/8˝ diameter bolt circle. Cut the opening for the terminal block as shown in Figures 2
and 4.
2. If the rear pressure connections are to be used, also provide 1/2˝ diameter holes
as shown in Figures 2 and 4.
3. Insert 6-32 machine screws from rear of mounting surface, threading them into
tapped holes on back of transmitter and tighten.
Figure 1: Panel mount
FOR PRESSURE
CONNECTION
53/64
[20.96]
3/4 [19.05]
Figure 2: Surface mount
DRILL TEMPLATE NEEDS TO BE USED FROM PANEL FRONT
[3] HOLES FOR
#6 SCREW
EQUALLY SPACED
ON Ø4-1/8
[104.78] B.C.
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Figure 3: Surface assembly with rear pressure connections
W
1 [25.40]
1 [25.40]
2X Ø5/8 [15.88] FOR PRESSURE CONNECTION
7/8 [22.23]
1-1/2 [38.10]
3/4 [19.05]
53/64 [20.96]
BE USED FROM PANEL FRONT
DRILL TEMPLATE NEEDS TO
[3] HOLES FOR #6 SCRE
EQUALLY SPACED ON
Ø4-1/8 [104.78] B.C.
Figure 4: Surface mounting drill template
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SP2 DESCRIPTOR
E
A
FRONT PANEL
PRESSURE
TIME
WIRING
The DHC 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.
15 Pin Connector
Function
12-28 VAC/VDC Power 12-28 VAC/VDC Power 4-20 mA Output Signal 0-10 V Output Signal External Input Signal Signal Common Relay #1 N/O Relay #1 Common Relay #1 N/C Relay #2 N/O Relay #2 Common Relay #2 N/C RS-485 B(+) RS-485 A(-) RS-485 Common
NOTICE
CAUTION
Terminal Cable Color
1 6 11 7 8 2 12 13 14 15 10 5 4 3 9
Brown Yellow Red Light Purple Light Green
Black
Violet Grey White
Dark Blue Dark Green
Orange Tan
Pink
Light Blue
The input power polarity is unimportant.
Wire in accordance with an equivalent national standard or code. Use copper conductors rated for 60°C. All terminals are rated
CLASS 2.
ISOLATION Zones: Each zone has 500 VAC isolation from all other zones.
Zone Inputs/Outputs
1
Power (1,6)
2
Current (2,11); Voltage (7); External Input (8)
3
Relay 1 (12,13,14)
4
Relay 2 (5,10,15)
5
RS-485 (3,4,9)
4-20 mA Transmitter – Check the specications for the device receiving this signal for input resistance. Typical 250 to 600 Ω, 600 Ω maximum.
OPERATION
KEY FUNCTIONS
Keys
Function
SP/AL Allows access
Home Position
Main Menu Function
Sub Menu Function
Edit Setting Function
Edit Value Function
to the Set Point and Alarm menus
MENU Allows access
to the menus
UP
Sequences
ARROW
DOWN
Sequences
ARROW
ENTER Display full-
scale range of unit
Return to home position
through menus
through menus Enter into sub menu
Return to previous menu Sequences through sub menus Sequences through sub menus Enter edit function for setting
Cancel edit, return to sub Menu Previous option
Cancel edit, return to sub Menu Increment the value
Next option Decrement
the value
Accept the current option
Short press: Move caron to next digit. Long Press: Accept the current value
RESET Clear or reset
an Alarm (alarm set for manual reset)
Peak/Valley
sub menu resets display to present value
ALARM DESCRIPTOR
SP1 DESCRIPTOR
MULTIPLIER
DESCRIPTOR
VISABLE WITH
SOME VELOCITY
ND FLOW RANGES
EXTERNAL INPUT
UNITS
INPUT VALU
Setting Set Points and Alarms
hot key provides direct access to the Set Point and Alarm MENU. The Set
The Point and Alarm MENUS that are displayed are based upon the Set Point (SP) and Alarm (AL) SUB MENUs. Reference the “SPAL MENU” diagram under the Menu Structure section for the complete menu structure.
Set Point Adjustment
Adjusting the DHC set points is quick and simple. Instead of setting a set point and
deadband, simply adjust “SP1T” or “SP2T” for the desired trigger point, and then adjust “SP1R” or “SP2R” for the desired reset point. The associated LED will light up green when the set point is triggered.
1.0
SP1T
SP1R
0.8
0.6
0.4
0.2 SP2R
SP2T
0
Figure 5: Set points
Using Figure 5 as an example, an instrument with a 1 in w.c. range would have the set point 1 turn on at 0.9 in w.c. and off at 0.85 in w.c. SP1T sets the turn on point and SP1R sets the turn off point. This represents a typical rising pressure set point. The second portion shows set point 2 turn on at 0.1 in w.c. and off at 0.15 in w.c. SP2T sets the turn on point, and SP2R sets the turn off point. This represents a typical falling pressure set point. Either set point can trigger a relay if selected in the rLy1 or rLy2 menus.
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MAIN MENUS AND SUBMENUS
Main Menu Selections (Upper Right Display Reads MENU)
• Pin - Set a custom pin code to lock out access to all menu settings
• oPEr Operation - Selection of pressure, velocity or ow mode, display units and
output scaling
• SP Set Point - Enable/disable set points
• AL Alarm - Enable/disable alarm limits, other alarm settings
• rLy Relay - Congure relay source and action when active
• inP Input - Congure external input
• diS Display - Monitor and adjust display related settings: Peak, valley, % output
and dampening
• Conn Connection - Congure RS-485 serial parameters and protocol
• CAL Calibration - Perform user zero and span, restore factory default settings, view device serial number
Pin - SUB MENU
In order to prevent unauthorized modication of settings, a pin number can be congured. Pin entry is enabled when the congured pin number is anything other
than 0000.
Unit (Velocity) SUB MENU
For velocity measurement, the following units are available:
• SFPM - Standard feet per minute
• M/S - Meters per second
AVAILABLE VELOCITY RANGES Input Range in w.c. SCFM Range M/S Range
±0.25 ±0.5 ±1.0 ±2.5 ±5.0 ±10.0 ±25.0 ±50.0 ±100.0
NOTICE
±20.02 x1K ±28.31 x1K ±40.04 x1K ±63.31 x1K ±89.53 x1K ±126.6 x1K ±200.2 x1K ±283.1 x1K ±400.4 x1K
±101.7 ±143.8 ±203.4 ±321.6 ±454.8 ±643.2 ±1017 ±1438 ±2034
Air velocity and ow readings are based upon standard dry air
conditions with an ambient temperature of 70°F and a barometric pressure of 29.92 INHG. Maximum velocity range is obtained with K-Factor set to maximum value (9.999).
oPEr (Operation) MAIN MENU
The oPEr MENU contains SUB MENUs that select the operating mode, display unit, and analog output scaling of the instrument. The SUB MENUS are:
• ≡odE - Mode
• Unit - Display Unit
• POL - Pressure Output Low
• POH - Pressure Output High
• KFAC - Velocity K-Factor
• VOL - Velocity Output Low
• VOH - Velocity Output High
• AREA - Duct Area
• FOL - Flow Output Low
• FOH - Flow Output High
• uoUt - Voltage Output Range
If the instrument mode is set to Pressure, the oPEr MENU will include the POL and POH SUB MENUs. If the instrument mode is set to Velocity, the oPEr MENU will include the KFAC, VOL and VOH SUB MENUs. If the instrument mode is set to Flow, the oPEr MENU will include KFAC, AREA, FOL and FOH SUB MENUs. These menus will be discussed under their respective sections following the Unit (Velocity) SUB
MENU and Unit (Flow) SUB MENUs sections.
≡odE (Mode) SUB MENU
Set the mode of operation of the instrument.
• PRES - Pressure
• VEL - Velocity
• FLOW - Flow
Unit(Pressure) SUB MENU
For pressure mode, the following units are available:
• 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
Unit (Flow) SUB MENU
For ow measurements the following units are available:
• SCFM - Standard cubic feet per minute
3
/H - Cubic meters per hour
• M
The Available Flow Ranges table below shows the ow ranges available with the
maximum duct size and K-Factor selected for each input range.
AVAILABLE FLOW RANGES Input Range in w.c. SCFM Range M
±0.25 ±0.5 ±1.0 ±2.5 ±5.0 ±10.0 ±25.0 ±50.0 ±100.0
±500.5 x1K ±707.8 x1K ±1.001 x1M ±1.583 x1M ±2.238 x1M ±3.165 x1M ±4.005 x1M ±7.078 x1M ±10.01 x1M
3
/H Range
±850.4 x1K ±1.203 x1M ±1.701 x1M ±2.689 x1M ±3.893 x1M ±5.378 x1M ±8.504 x1M ±12.03 x1M ±17.01 x1M
POL and POH SUB MENUs
Pressure output low and pressure output high are used to scale the current and voltage output. Set POL to the desired display reading for 4 mA output. Set POH to the desired display reading for 20 mA output. POL can be greater than POH. In this situation, the analog outputs are reverse acting.
KFAC SUB MENU
The K-Factor sub menu becomes accessible if the instrument mode is set to Velocity or Flow. When the DHC is used with a Pitot tube, the manufacturer may specify a K-Factor. The adjustment range is 0.001 to 9.999. The factory setting is 1.
VOL and VOH SUB MENUs
Velocity output low and velocity output high are used to scale the current and voltage output. Set VOL to the desired display reading for 4 mA output. Set VOH to the desired display reading for 20 mA output. VOL can be greater than VOH. In this situation, the analog outputs are reverse acting.
AREA SUB MENU
The Area sub menu becomes accessible if the instrument mode is set to Flow. The duct
area is specied in either ft
range is 0.13-25.0 ft
2
or m2 depending on the ow unit selected. The adjustment
2
(0.012-2.323 m2). The factory setting is 1 ft2 (0.093 m2).
FOL and FOH SUB MENUs
Flow output low and ow output high are used to scale the current and voltage output.
Set FOL to the desired display reading for 4 mA output. Set FOH to the desired display reading for 20 mA output. FOL can be greater than FOH. In this situation, the analog outputs are reverse acting.
PRESSURE RANGE VS. AVAILABLE UNITS INWC FTWC MMWC CMWC PSI INHG MMHG MBAR PA KPA HPA OZIN
.1000 .2500 .5000
1.000
2.500
5.000
10.00
25.00
50.00
100.0
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.2083 .4167 .8333
2.083
4.167
8.333
2.540
6.350
12.70
25.40
63.50
127.0
254.0
635.0 1270 2540
.2540 .6350
1.270
2.540
6.350
12.70
25.40
63.50
127.0
254.0
.1806 .3613 .9032
1.806
3.613
.1839 .3678 .7356
1.839
3.678
7.356
.1868
.2491 .4671 .9342
1.868
4.671
9.342
18.68
46.71
93.42
186.8
.6227
1.245
2.491
6.227
12.45
24.91
62.27
124.5
249.1
24.91
62.27
124.5
249.1
622.7 1245 2491 6227
.1245 .2491 .6227
1.245
2.491
6.227
12.45
24.91
.2491 .6227
1.245
2.491
6.227
12.45
24.91
62.27
124.5
249.1
.1445 .2890 .5780
1.445
2.890
5.780
14.45
28.90
57.80
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uoUt (Voltage Output Range) SUB MENU
The voltage output range setting allows the voltage output limits to be congured to 1
of 4 common ranges. Available options include: 0-10 V, 0-5 V, 1-5 V, and 2-10 V. The factory setting is 0-10 V.
SP (Set Point) MAIN MENU
The SP MENU allows the individual set points to be enabled or disabled. The SUB MENUS are:
• SP1 - Set Point 1 Enable
• SP2 - Set Point 2 Enable
SP1 (Set Point 1 Enable) SUB MENU
Enable/disable set point 1. When enabled (ON), the set point 1 trigger and reset SUB MENUS will appear in the SPAL menu. The factory setting is ON.
SP2 (Set Point 2 Enable) SUB MENU
Enable/disable set point 2. When enabled (ON), the set point 2 trigger and reset SUB MENUS will appear in the SPAL menu. The factory setting is ON.
rLy1, rLy2 (Relay 1 Source, Relay 2 Source) SUB MENUS
• OFF - Relay not used
• SP1 - Set Point 1
• SP2 - Set Point 2
• AL - Either Alarm
• ALHI - High Alarm
• ALLO - Low Alarm
• EXT - External Input
The selected source determines when the relay is active. If the source is active, the relay will be active.
r1At, r2At (Relay 1 Action, Relay 2 Action) SUB MENUS
• DIR - Direct Acting/CLSE - Close on Active
• REV - Reverse Acting/OPEN - Open on Active
The selected action determines what happens when the relay is active. If the selected source is an alarm, then the options are CLSE and OPEN.
AL (Alarm) MAIN MENU
The AL MENU allows the features of the alarm to be congured. The SUB MENUS are:
• ALHi - Alarm High Limit Enable
• ALLo - Alarm Low Limit Enable
• ALrE - Alarm Reset Type
• ALiH - Alarm Inhibit Enable
• ALDL - Alarm Delay Time
ALHi (Alarm High Limit Enable) SUB MENU
Enable/disable the alarm high limit. When enabled (ON), the alarm high limit (ALHI) SUB MENU will appear in the SPAL menu. The factory setting is ON.
ALLo (Alarm Low Limit Enable) SUB MENU
Enable/disable the alarm low limit. When enabled (ON), the alarm low limit (ALLO) SUB MENU will appear in the SPAL menu. The factory setting is ON.
ALrE (Alarm Reset Type) SUB MENU
• AUTO - Automatic reset (factory setting)
• HOLD - Manual reset. An alarm is reset by the RESET key on the front panel.
ALiH (Low Alarm Inhibit) SUB MENU
• ON - Alarm inhibit is on
• OFF - Alarm inhibit is off (factory setting)
If ALiH 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. The factory setting is 0.
rLy (Relay) MAIN MENU
The rLy menu includes options to congure which source will trigger a relay and what
happens when a relay is triggered. The SUB MENUS are:
• rLy1 - Relay 1 Source
• rLy2 - Relay 2 Source
• r1At - Relay 1 Action
• r2At - Relay 2 Action
inP (Input) MAIN MENU
The inP MENU allows the features of the external input to be congured. The SUB
MENUs are:
• inP - External Input Enable
• tyPE - External Input Type
• DLY - External Input Delay
inP (External Input Enable) SUB MENU
• ON - External input enabled (factory setting)
• OFF - External input disabled
tyPE (External Input Type) SUB MENU
• NO - Normally Open (factory setting)
• NC - Normally Closed
DLY (External Input Delay) SUB MENU
Sets the amount of time the external input must be continuously active before it is considered active. The delay is adjustable from 0-3600. The factory setting is 0.
diS (Display) MAIN MENU
• PEAK - Peak value
• VALY - Valley value
• PdiS - Process display
• DAMP - Damping Time
PEAK (Peak) SUB MENU
The Peak feature stores the highest process 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 process 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.
PdiS (Process Display) SUB MENU
• STD - Display reads pressure, velocity, or ow values
• PCT - Display reads % of full-scale value
When the display is reading percent, PCT is displayed in the upper right of the display.
DAMP (Damping) SUB MENU
The damping time can be adjusted from 0 to 30 seconds.
Damping stabilizes the display and outputs from instabilities due to circumstances
such as vibration and excessive pressure uctuations. Adjust the damping value until
the display reads a stable value for the application.
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Conn (Connection) MAIN MENU
The Conn menu contains SUB MENUS to congure the RS-485 serial parameters and
selected protocol. The SUB MENUS are:
• Prot - Protocol
• ADDR - Protocol Address
• bAUd - Serial Baud Rate
• PAr - Serial Parity
• StP - Serial Stop Bits
Prot (Protocol) SUB MENU
• MOD - Modbus
• BAC - BACnet Communication
• NONE - Communication disabled
®
Communication (factory setting)
SPAN (Span Calibration) SUB MENU
For an accurate calibration, perform a Zero calibration rst. The pressure to apply
will depend on the selected mode and the POH, VOH or FOH value. Apply a stable
pressure equal to the congured output high value. Press and hold the ENTER button
until the process value is cleared. The display will show a dash in each digit starting with the left most position. After 4 dashes have been displayed, the process value will be displayed and the new span will be applied. If the span cannot be applied, a FAiL message will be displayed. This error could occur if the applied pressure is too low or too high.
rSt (Reset Factory Defaults) SUB MENU
• NO - Do nothing
• YES - Reset all settings, clear user calibration
ADDR (Protocol Address) SUB MENU
This value sets the RS-485 device address. See the table below for protocol specic
ranges. The factory setting is 127. SUB MENU not available if protocol is NONE.
Protocol Range
®
Modbus BACnet
bAUd (Serial Baud Rate) SUB MENU
• 96 - 9600 bps
• 192 - 19200 bps
• 384 - 38400 bps
• 576 - 57600 bps
• 768 - 76800 bps
• 1152 - 115200 bps
• AUTO - Auto-baud (factory setting)
If the selected protocol is Modbus determine the serial parity and serial stopbits. If selected communication protocol is
BACnet, serial parity and serial stop bits are xed to NONE and 1 respectively. SUB
MENU not available if protocol is NONE.
PAr (Serial Parity) SUB MENU
• EVEN - Even Parity (factory setting)
• ODD - Odd Parity
• NONE - No Parity
SUB MENU not available if protocol is NONE or BAC or if serial baud rate is AUTO.
StP (Serial Stop Bits) SUB MENU
• 1 - One stop bit
• 2 - Two stop bits
1-247 0-127
®
communication, the AUTO setting will also
After selecting YES the instrument will reboot itself.
Sn 1, Sn 2 (Serial Number Display) SUB MENUS
The serial number of the instrument can be viewed on the display using these menus.
The rst 4 characters are available with Sn 1 and the second 4 characters are available
with Sn 2.
SPAL (Set Point/Alarm) MENU
The SPAL menu contains the set point trigger and reset value as well as the alarm limits. This menu is accessible from the home screen with the SPAL button. If both set points and both alarm limits are disabled, then the SPAL menu will contain no SUB MENUS and pressing the SPAL button will not do anything. The SUB MENUS are:
• SP1T - Set Point 1 Trigger
• SP1R - Set Point 1 Reset
• SP2T - Set Point 2 Trigger
• SP2R - Set Point 2 Reset
• ALLO - Alarm Low Limit
• ALHI - Alarm High Limit
SP1T, SP2T (Set Point Trigger) SUB MENUS
These SUB MENUS set the trigger value for each set point. When the process value equals the set point trigger value, the set point is considered active. These SUB MENUS are only present if their corresponding enable setting is set to ON.
SP1R, SP2R (Set Point Reset) SUB MENUS
These SUB MENUS set the reset value for each set point. When the process value equals the set point reset value, the set point is considered inactive. These SUB MENUS are only present if their corresponding enable setting is set to ON.
ALLO (Alarm Low Limit) SUB MENU
This SUB MENU sets the alarm low limit value. If the process value is less than the alarm low limit value, the low alarm is considered active.
SUB MENU not available if protocol is NONE or BAC or if serial baud rate is AUTO.
CAL (Calibration) Main Menu
The CAL menu contains SUB MENUS to perform eld calibration, reset settings, and
display information. The SUB MENUS are:
• ZERO - Zero Calibration
• SPAN - Span Calibration
• rSt - Reset Factory Defaults
• Sn 1 - Display Serial Number part 1
• Sn 2 - Display Serial Number part 2
ZERO (Zero Calibration) SUB MENU
For accurate calibration, do not apply any pressure when performing this function. Press and hold the ENTER button unit the process value is cleared. The display will show a dash in each digit starting with the left most position. After 4 dashes have been displayed, the process value will be displayed and the new zero will be applied. For best results, perform the zeroing function in the same orientation you will mount the DHC.
ALHI (Alarm High Limit) SUB MENU
This SUB MENU sets the alarm high limit value. If the process value is greater than the alarm high limit value, the high alarm is considered active.
The range of the alarm limits depends on the selected mode. If both low and high alarm limits are enabled, they cannot be closer than 2% of full-scale to each other. The
dead bands of the alarm limits are xed at 1% of full-scale.
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AUTO SERIAL CONFIGURATION
Auto serial conguration enables the device to determine the baud rate, parity and stop bits directly from the serial trafc. This allows a device to be quickly and easily deployed after a valid RS-485 MAC address is chosen. Note that the auto conguration procedure assumes a serial conguration appropriate to the selected protocol as
follows:
SUPPORTED SERIAL CONFIGURATIONS
Protocol
BACnet - MS/TP 9600
®
- RTU Even
Modbus
When Modbus
away from the main network, it is necessary to generate trafc in order to congure the
serial communication. Attempting to read input registers is a good method to generate
trafc. Note that while serial conguration is in progress, the device may not respond
to requests. The device may require multiple read requests to complete the serial
conguration process.
The auto serial conguration process will complete once a message addressed to the device is received and processed successfully. The serial conguration parameters
are then saved to non-volatile storage and loaded by default each time the device
starts. If the serial conguration of the bus changes, a power cycle of the device is required to restart the auto serial conguration process.
BACnet Communication Protocol Services Device Communication Control Service (DM-DCC-B)
This device supports the Device Communication Control Service BIBB. The optional
time duration in minutes is also supported. This device is congured with a password
that must be provided to successfully execute this command. The password is “Dwyer”.
Reinitialize Device Service (DM-RD-B)
This device supports the Reinitialize Device Service BIBB. The supported device states are COLDSTART and WARMSTART. All other states return error. This device
is congured with a password that must be provided to successfully execute this
command. The password is “Dwyer”.
Supported Baud Rates Data Size Parity Stop Bits
19200 38400 57600 78600 115200
®
communications protocol is selected, and the device is setup ofine or
8 None 1
1 Odd None None 2
BACnet Communication Protocol Objects Overview
The instrument supports the following objects:
SUPPORTED BACNET COMMUNICATION PROTOCOL OBJECTS
Object Type
Device Analog Input Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Multi-State Value Multi-State Value Multi-State Value Multi-State Value Multi-State Value Multi-State Value Multi-State Value Binary Value Binary Value Binary Value Binary Value Binary Value Binary Value Binary Value Binary Value Binary Value Binary Value Binary Value Binary Value Positive Integer Value Positive Integer Value Positive Integer Value
Note: The default object identier is 607xxx, where xxx is replaced by the MS/TP
MAC address set in the ADDR SUB MENU under the Conn MENU. The object
identier value will change as the MS/TP MAC address changes. However, if a specic object identier is written via BACnet communication protocol, then that
value is stored and changes to the MS/TP MAC address will no longer affect the
object identier. Similarly, the default object name includes 607xxx. The object name will reect the current object identier. If a specic object name is written via BACnet communication protocol, then that value is stored and changes to the object identier
will no longer affect the object name.
Dynamically
Creatable
No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No
No
No
Dynamically
Deletable
No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No
No
No
Object Identier Object Name
607xxx AI1 AV1 AV2 AV3 AV4 AV5 AV6 AV7 AV8 AV9 AV10 AV11 AV12 AV13 AV14 MSV1 MSV2 MSV3 MSV4 MSV5 MSV6 MSV7 BV1 BV2 BV3 BV4 BV5 BV6 BV7 BV8 BV9 BV10 BV11 BV12 PIV1
PIV2
PIV3
DHC 607xxx Pressure Velocity Flow
Peak
Valley Velocity K-Factor Flow Area Process Output Low Process Output High Set Point 1 Trigger Value Set Point 1 Reset Value Set Point 2 Trigger Value Set Point 2 Reset Alarm High limit Alarm Low Limit Process Mode Voltage Output Range Relay 1 Source Relay 1 Action Relay 2 Source Relay 2 Action External Input Type Enable Set Point 1 Set Point 1 Status Enable Set Point 2 Set Point 2 Status Enable Alarm High Limit Alarm High Limit Status Enable Alarm Low Limit Alarm Low Limit Status Manual Alarm Reset Power Up Alarm Inhibit Enable External Input External Input Status Alarm Delay
External Input Activation Delay Damping Time
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BACnet Communication Protocol Objects Device Object
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type System Status Vendor Name
Vendor Identier
Model Name Firmware Version Application Software Version Location Description Protocol Version Protocol Revision Protocol Services Supported Protocol Object Types Supported Object List Maximum APDU Length Accepted Segmentation Supported APDU Timeout Number of APDU Retires Max Master Max Info Frames Device Address Binding
Database Revision Property List
Serial Number
Analog Input - Pressure
This object represents the current pressure reading in the selected unit of measure. The pressure unit is set via the units property and is independent of the display unit.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units
607127 “DHC 607127” Device Operational “Dwyer Instruments, LLC.” 607 “DHC-xxx-xxx” “x.x” “x.x.x”
“” “” 1 16 See PICS
See Table Above
See Table Above 480
No Segmentation 0 0 127 1 {}
0 This Table
“xxxxxx”
AI1 “Pressure” Analog Input Current Reading {0,0,0,0} Normal No Fault Detected FALSE
*Model Specic
BACnet Object Identier
Character String(32) BACnet Object Type BACnet Device Status Character String
Unsigned Character String Character String Character String
Character String(32) Character String(32) Unsigned Unsigned BACnet Services Supported BACnet Object Types Supported BACnet Array Unsigned
BACnet Segmentation Unsigned Unsigned Unsigned Unsigned BACnet Address Binding Unsigned BACnet Array[N] of BACnet Property
Identier
Character String
BACnet Object Identier
Character String BACnet Object Type Real BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units
Read/Write Read/Write Read Read Read
Read Read Read Read
Read/Write Read/Write Read Read Read
Read
Read Read
Read Read Read Read/Write Read Read
Read Read
Read
Read Read Read Read Read Read Read Read/Write Read/Write
Analog Value - Velocity
This object represents the current velocity reading in the selected unit measure. The velocity unit is set via the units property and is independent of the display unit.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units
Supported velocity units:
• feet-per-minute(77)
• meters-per-second(74)
Analog Value - Flow
This object represents the current ow reading in the selected unit measure. The ow
unit is set via the units property and is independent of the display unit.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units
Supported ow units:
• cubic-feet-per-minute(84)
• cubic-meters-per-hour(135)
Analog Value - Peak
This object represents the maximum process value measured since the last power cycle or reset. The unit of measure matches the selected process value. This value cannot be reset remotely.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units
AV1 “Velocity” Analog Value Current Reading {0,0,0,0} Normal No Fault Detected FALSE
*Model Specic
AV2 “Flow” Analog Value Current Reading {0,0,0,0} Normal No Fault Detected FALSE Process Value Unit
AV3
“Peak”
Analog Value Current Reading {0,0,0,0} Normal No Fault Detected FALSE Process Value Unit
BACnet Object Identier
Character String BACnet Object Type Real BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units
BACnet Object Identier
Character String BACnet Object Type Real BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units
BACnet Object Identier
Character String BACnet Object Type Real BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units
Read Read Read Read Read Read Read Read/Write Read/Write
Read Read Read Read Read Read Read Read/Write Read
Read Read Read Read Read Read Read Read/Write Read
Supported pressure units:
• inches-of-water(58)
• feet-of-water*(530)
• millimeters-of-water(206)
• centimeters-of-water(57)
• pounds-force-per-square-inch(56)
• inches-of-mercury(61)
• millibars(134), pascals(53)
• hectopascals(133)
• kilopascals(54)
• ounce-force-per-square-inch*(531)
*Non-standard unit
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Analog Value - Valley
This object represents the minimum process value measured since the last power cycle or reset. The unit of measure matches the selected process value. This value cannot be reset remotely.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units
Analog Value - Velocity K-Factor
This object represents the Velocity K-Factor setting. When the instrument is used with a Pitot tube, the manufacturer may specify a K-Factor in order to properly convert differential pressure to velocity.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units Max Pres Value Min Pres Value
Analog Value - Flow Area
This object represents the cross sectional area of the duct where ow is to be measured. The area is specic in either ft
The adjustment range is 0.13-25.0 ft
2
(0.093 m
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units
Max Pres Value Min Pres Value
).
AV4 “Valley” Analog Value Current Reading {0,0,0,0} Normal No Fault Detected FALSE Process Value Unit
AV5 “Velocity K-Factor” Analog Value
1.0 {0,0,0,0} Normal No Fault Detected FALSE no-units
9.999
0.001
AV6 “Flow Area” Analog Value
1.0 (0.093) {0,0,0,0} Normal No Fault Detected FALSE square-feet (square-meters)
25.0 (2.323)
0.13 (0.093)
BACnet Object Identier
Character String BACnet Object Type Real BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units
BACnet Object Identier
Character String BACnet Object Type Real BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units Real Real
2
or m2 depending on the ow unit selected.
2
(0.012-2.323 m2). The factory setting is 1 ft2
BACnet Object Identier
Character String BACnet Object Type Real BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units
Real Real
Read Read Read Read Read Read Read Read/Write Read
Read Read Read Read/Write Read Read Read Read/Write Read Read Read
Read Read Read Read/Write Read Read Read Read/Write Read
Read Read
Multi-State Value - Process Mode
This object represents the process or operating mode of the instrument. This setting determines which process variable is output on the analog channels and measurement
unit of the peak, valley, set points and alarm limits.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Number of States State Text
Analog Value - Process Output Low
This object represents the process value at which the analog output channels will be at their minimum value. The unit of this value matches the unit of the selected process mode.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units Max Pres Value Min Pres Value
Analog Value - Process Output High
This object represents the process value at which the analog output channels will be at their maximum value. The unit of this value matches the unit of the selected process mode.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units Max Pres Value Min Pres Value
MSV1 “Process Mode” Multi-State Value 1 {0,0,0,0} Normal No Fault Detected FALSE 3 “Pressure”, “Velocity”, “Flow”
AV7 “Process Output Low” Analog Value
Model Specic
{0,0,0,0} Normal No Fault Detected FALSE
Mode Specic Model Specic Model Specic
AV8 “Process Output High” Analog Value
Model Specic
{0,0,0,0} Normal No Fault Detected FALSE
Mode Specic Model Specic Model Specic
BACnet Object Identier
Character String BACnet Object Type Unsigned BACnet Status Flags BACnet Event State BACnet Reliability Boolean Unsigned BACnet Array[N] of Character String
BACnet Object Identier
Character String BACnet Object Type Real BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units Real Real
BACnet Object Identier
Character String BACnet Object Type Real BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units Real Real
Read Read Read Read/Write Read Read Read Read/Write Read Read
Read Read Read Read/Write Read Read Read Read/Write Read Read Read
Read Read Read Read/Write Read Read Read Read/Write Read Read Read
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Multi-State Value - Voltage Output Range
This object represents the nominal range of the voltage output channel.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Number of States State Text
Binary Value - Enable Set Point 1
This object represents the enable state of set point 1. When enabled, the set point 1 trigger and reset values are compared against the current process value.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service
Analog Value - Set Point 1 Trigger Value
This object represents the process value at which set point 1 transitions from inactive to active. The unit of this value matches the unit of the selected process mode.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units
Max Pres Value Min Pres Value
MSV2 “Voltage Output Range” Multi-State Value 1 {0,0,0,0} Normal No Fault Detected FALSE 4 {“0-10V”, “0-5V”, “2-10V”, “1-5”}
BV1 “Enable Set Point 1” Binary Value Active {0,0,0,0} Normal No Fault Detected FALSE
AV9 “Set Point 1 Trigger Value” Analog Value
Model Specic
{0,0,0,0} Normal No Fault Detected FALSE
Mode Specic
Model Specic Model Specic
BACnet Object Identier
Character String BACnet Object Type Unsigned BACnet Status Flags BACnet Event State BACnet Reliability Boolean Unsigned BACnet Array[N] of Character String
BACnet Object Identier
Character String BACnet Object Type BACnet Binary PV BACnet Status Flags BACnet Event State BACnet Reliability Boolean
BACnet Object Identier
Character String BACnet Object Type Real BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units Real Real
Read Read Read Read/Write Read Read Read Read/Write Read Read
Read Read Read Read/Write Read Read Read Read/Write
Read Read Read Read/Write Read Read Read Read/Write Read
Read Read
Analog Value - Set Point 1 Reset Value
This object represents the process value at which set point 1 transitions from active to inactive. The unit of this value matches the unit of the selected process mode.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units Max Pres Value Min Pres Value
Binary Value - Set Point 1 Status
This object represents the current status of set point 1. When active, the SP1 LED on the instrument face is illuminated.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service
Binary Value - Enable Set Point 2
This object represents the enable state of set point 2. When enabled, the set point 2 trigger and reset values are compared against the current process value.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service
Analog Value - Set Point 2 Trigger Value
This object represents the process value at which set point 2 transitions from inactive to active. The unit of this value matches the unit of the selected process mode.
Property Default Value Property Data Type Access
Object Identier
Object Name
Object Type Preset Value Status Flags Event State Reliability Out Of Service Units Max Pres Value Min Pres Value
AV10 “Set Point 1 Reset Value” Analog Value
Model Specic
{0,0,0,0} Normal No Fault Detected FALSE
Mode Specic Model Specic Model Specic
BV2 “Set Point 1 Status” Binary Value Inactive {0,0,0,0} Normal No Fault Detected FALSE
BV3 “Enable Set Point 2” Binary Value Active {0,0,0,0} Normal No Fault Detected FALSE
AV11 “Set Point 2 Trigger Value” Analog Value
Model Specic
{0,0,0,0} Normal No Fault Detected FALSE
Mode Specic Model Specic Model Specic
BACnet Object Identier
Character String BACnet Object Type Real BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units Real Real
BACnet Object Identier
Character String BACnet Object Type BACnet Binary PV BACnet Status Flags BACnet Event State BACnet Reliability Boolean
BACnet Object Identier
Character String BACnet Object Type BACnet Binary PV BACnet Status Flags BACnet Event State BACnet Reliability Boolean
BACnet Object Identier
Character String
BACnet Object Type Real BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units Real Real
Read Read Read Read/Write Read Read Read Read/Write Read Read Read
Read Read Read Read Read Read Read Read/Write
Read Read Read Read/Write Read Read Read Read/Write
Read Read
Read Read/Write Read Read Read Read/Write Read Read Read
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Analog Value - Set Point 2 Reset Value
This object represents the process value at which set point 2 transitions from active to inactive. The unit of this value matches the unit of the selected process mode.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units Max Pres Value Min Pres Value
Binary Value - Set Point 2 Status
This object represents the current status of set point 2. When active, the SP2 LED on the instrument face is illuminated.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service
Binary Value - Enable Alarm High Limit
This object represents the enable state of the alarm high limit. When enabled, the alarm high limit value is compared against the current process value.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service
Analog Value - Alarm High Limit
This object represents the process value at which the alarm high status transitions from inactive to active. The unit of this value matches the unit of the selected process mode. The alarm high status transitions from active to inactive at 1% full-scale less than this value.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units Max Pres Value Min Pres Value
AV12 “Set Point 2 Reset Value” Analog Value
Model Specic
{0,0,0,0} Normal No Fault Detected FALSE
Mode Specic Model Specic Model Specic
BV4 “Set Point 2 Status” Binary Value Inactive {0,0,0,0} Normal No Fault Detected FALSE
BV5 “Enable Alarm High Limit” Binary Value Active {0,0,0,0} Normal No Fault Detected FALSE
AV13 “Alarm High Limit” Analog Value
Model Specic
{0,0,0,0} Normal No Fault Detected FALSE
Mode Specic Model Specic
Alarm Low Limit
BACnet Object Identier
Character String BACnet Object Type Real BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units Real Real
BACnet Object Identier
Character String BACnet Object Type BACnet Binary PV BACnet Status Flags BACnet Event State BACnet Reliability Boolean
BACnet Object Identier
Character String BACnet Object Type BACnet Binary PV BACnet Status Flags BACnet Event State BACnet Reliability Boolean
BACnet Object Identier
Character String BACnet Object Type Real BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units Real Real
Read Read Read Read/Write Read Read Read Read/Write Read Read Read
Read Read Read Read Read Read Read Read/Write
Read Read Read Read/Write Read Read Read Read/Write
Read Read Read Read/Write Read Read Read Read/Write Read Read Read
Binary Value - Alarm High Limit Status
This object represents the current status of the alarm high limit. When active, the ALHI LED on the instrument face is illuminated.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service **The high alarm status can be reset to inactive by writing inactive to the present value property. This is allowed only if the Manual Alarm Reset is Active and the
process value no longer satises the alarm high condition. In all other cases a
BACnet communication protocol error is returned.
Binary Value - Enable Alarm Low Limit
This object represents the enable state of the alarm low limit. When enabled, the alarm low limit value is compared against the current process value.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service
Analog Value - Alarm Low Limit
This object represents the process value at which the alarm low status transitions from inactive to active. The unit of this value matches the unit of the selected process mode. The alarm low status transitions from active to inactive at 1% full-scale greater than this value.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units Max Pres Value Min Pres Value
BV6 “Alarm High Limit Status” Binary Value Inactive {0,0,0,0} Normal No Fault Detected FALSE
BV7 “Enable Alarm Low Limit” Binary Value Active {0,0,0,0} Normal No Fault Detected FALSE
AV14 “Alarm Low Limit” Analog Value
Model Specic
{0,0,0,0} Normal No Fault Detected FALSE
Mode Specic
Alarm High Limit
Model Specic
BACnet Object Identier
Character String BACnet Object Type BACnet Binary PV BACnet Status Flags BACnet Event State BACnet Reliability Boolean
BACnet Object Identier
Character String BACnet Object Type BACnet Binary PV BACnet Status Flags BACnet Event State BACnet Reliability Boolean
BACnet Object Identier
Character String BACnet Object Type Real BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units Real Real
Read Read Read Read/Write** Read Read Read Read/Write
Read Read Read Read/Write Read Read Read Read/Write
Read Read Read Read/Write Read Read Read Read/Write Read Read Read
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Binary Value - Alarm Low Limit Status
This object represents the current status of the alarm low limit. When active, the ALLO LED on the instrument face is illuminated.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service **The low alarm status can be reset to inactive by writing inactive to the present value property. This is allowed only if the Manual Alarm Reset is Active and the
process value no longer satises the alarm low condition. In all other cases a BACnet
communication protocol error is returned.
Binary Value - Manual Alarm Reset
This object represents the alarm type setting (ALrE in the menu). When active, the alarm status will remain active after the alarm condition has passed.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service
Binary Value - Power Up Alarm Inhibit
This object represents the Low Alarm Inhibit (ALiH) SUB MENU. When enabled, the process value must be greater than the alarm low limit before an alarm low condition is considered active.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service
Positive Integer Value - Alarm Delay
This object represents the amount of time an alarm condition must be continuously met before the alarm status becomes active.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units Max Pres Value Min Pres Value
BV8 “Alarm Low Limit Status” Binary Value Inactive {0,0,0,0} Normal No Fault Detected FALSE
BV9 “Manual Alarm Reset” Binary Value Inactive {0,0,0,0} Normal No Fault Detected FALSE
BV10 “Power Up Alarm Inhibit” Binary Value Inactive {0,0,0,0} Normal No Fault Detected FALSE
PIV1 “Alarm Delay” Positive Integer Value 0 {0,0,0,0} Normal No Fault Detected FALSE
Mode Specic
3600 0
BACnet Object Identier
Character String BACnet Object Type BACnet Binary PV BACnet Status Flags BACnet Event State BACnet Reliability Boolean
BACnet Object Identier
Character String BACnet Object Type BACnet Binary PV BACnet Status Flags BACnet Event State BACnet Reliability Boolean
BACnet Object Identier
Character String BACnet Object Type BACnet Binary PV BACnet Status Flags BACnet Event State BACnet Reliability Boolean
BACnet Object Identier
Character String BACnet Object Type Unsigned BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units Real Real
Read Read Read Read/Write** Read Read Read Read/Write
Read Read Read Read/Write Read Read Read Read/Write
Read Read Read Read/Write Read Read Read Read/Write
Read Read Read Read/Write Read Read Read Read/Write Read Read Read
Multi-State Value - Relay 1 Source
This object represents the relay 1 source setting. The selected source determines when the relay is active. If the source is active, the relay will be active.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Number of States State Text
Multi-State Value - Relay 1 Action
This object represents the relay 1 action setting. The selected action determines what happens when the relay is active. If the selected source is an alarm, then the state text values are “Close” and “Open”.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Number of States State Text
Multi-State Value - Relay 2 Source
This object represents the relay 2 source setting. The selected source determines when the relay is active. If the source is active, the relay will be active.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Number of States State Text
MSV3 “Relay 1 Source” Multi-State Value 2 {0,0,0,0} Normal No Fault Detected FALSE 7 {“Off”, “Set Point 1”, “Set Point 2”, “Any Alarm”, ”Alarm High LImit”, “Alarm Low Limit”, “External Input”}
MSV4 “Relay 1 Action” Multi-State Value 1 {0,0,0,0} Normal No Fault Detected FALSE 2 {“Direct”, “Reverse”}
MSV5 “Relay 2 Source” Multi-State Value 3 {0,0,0,0} Normal No Fault Detected FALSE 7 {“Off”, “Set Point 1”, “Set Point 2”, “Any Alarm”, ”Alarm High LImit”, “Alarm Low Limit”, “External Input”}
BACnet Object Identier
Character String BACnet Object Type Unsigned BACnet Status Flags BACnet Event State BACnet Reliability Boolean Unsigned BACnet Array[N] of Character String
BACnet Object Identier
Character String BACnet Object Type Unsigned BACnet Status Flags BACnet Event State BACnet Reliability Boolean Unsigned BACnet Array[N] of Character String
BACnet Object Identier
Character String BACnet Object Type Unsigned BACnet Status Flags BACnet Event State BACnet Reliability Boolean Unsigned BACnet Array[N] of Character String
Read Read Read Read/Write Read Read Read Read/Write Read Read
Read Read Read Read/Write Read Read Read Read/Write Read Read
Read Read Read Read/Write Read Read Read Read/Write Read Read
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Multi-State Value - Relay 2 Action
This object represents the relay 2 action setting. The selected action determines what happens when the relay is active. If the selected source is an alarm, then the state text values are “Close” and “Open”.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Number of States State Text
Binary Value - Enable External Input
This object represents the enable state of the external input. When enabled, the external input is monitored and can be used to active a relay.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service
Multi-State Value - External Input Type
This object represents the type of contact/switch connected to the external input.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Number of States State Text
Positive Integer Value - External Input Activation Delay
This object represents the amount of time the external input must be continuously active before it is considered active.
Property Default Value Property Data Type Access
Object Identier
Object Name
Object Type Preset Value Status Flags Event State Reliability Out Of Service Units Max Pres Value Min Pres Value
MSV6 “Relay 2 Action” Multi-State Value 1 {0,0,0,0} Normal No Fault Detected FALSE 2 {“Direct”, “Reverse”}
BV11 “Enable External Input” Binary Value Active {0,0,0,0} Normal No Fault Detected FALSE
MSV7 “External Input Type” Multi-State Value 1 {0,0,0,0} Normal No Fault Detected FALSE 2 {“Normally Open”, “Normally Closed”}
PIV2 “External Input Activation Delay” Positive Integer Value 0 {0,0,0,0} Normal No Fault Detected FALSE
Mode Specic
3600 0
BACnet Object Identier
Character String BACnet Object Type Unsigned BACnet Status Flags BACnet Event State BACnet Reliability Boolean Unsigned BACnet Array[N] of Character String
BACnet Object Identier
Character String BACnet Object Type BACnet Binary PV BACnet Status Flags BACnet Event State BACnet Reliability Boolean
BACnet Object Identier
Character String BACnet Object Type Unsigned BACnet Status Flags BACnet Event State BACnet Reliability Boolean Unsigned BACnet Array[N] of Character String
BACnet Object Identier
Character String BACnet Object Type Unsigned BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units Real Real
Read Read Read Read/Write Read Read Read Read/Write Read Read
Read Read Read Read/Write Read Read Read Read/Write
Read Read Read Read/Write Read Read Read Read/Write Read Read
Read Read
Read Read/Write Read Read Read Read/Write Read Read Read
Binary Value - External Input Status
This object represents the current status of the external input. When active, the EXT LED on the instrument face is illuminated.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service
Positive Integer Value - Damping Time
This object represents the time, in seconds, for the process measurement to reach
99.8% of the current input value. A value of 0 disables the damping feature.
Property Default Value Property Data Type Access
Object Identier
Object Name Object Type Preset Value Status Flags Event State Reliability Out Of Service Units Max Pres Value Min Pres Value
BV12 “External Input Status” Binary Value Inactive {0,0,0,0} Normal No Fault Detected FALSE
PIV3 “Damping Time” Positive Integer Value 0 {0,0,0,0} Normal No Fault Detected FALSE
Mode Specic
30 0
BACnet Object Identier
Character String BACnet Object Type BACnet Binary PV BACnet Status Flags BACnet Event State BACnet Reliability Boolean
BACnet Object Identier
Character String BACnet Object Type Unsigned BACnet Status Flags BACnet Event State BACnet Reliability Boolean BACnet Engineering Units Real Real
Read Read Read Read Read Read Read Read/Write
Read Read Read Read/Write Read Read Read Read/Write Read Read Read
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Modbus® Communications Protocol Overview
®
communications protocol installations should comply with
NOTICE
and Implementation Guide V1.02, Modbus
NOTICE
Modbus
®
Communication Protocol over Serial Line Specication
Modbus
®
Organization, Inc., 2006
Communications wiring must be in a daisy-chain fashion. Star connections and T connections are not permitted
®
Modbus
Communications Protocol Functions
The DHC supports the following functions.
®
Modbus
Communications Protocol Registers
Input Registers
The String data type is read as a stream of ASCII characters with the rst character sent in the MSB of the rst register and the second character sent in the LSB of the rst register and so on. If the string is shorter than the allotted size, the remaining bytes
will be zero padded.
INPUT REGISTERS Register Description Data Type Range
0001-0002 0003-0004 0005-0006 0007-0008 0009-0010 0011 0012 0013 0014-0015 8001-8016 8017-8020 8021-8028 8029-8032
Pressure Velocity Flow
Peak
Valley Set Point 1 Status Set Point 2 Status External Input Status Error Flags Model Number Serial Number Firmware Version Date Code
32bit oat 32bit oat 32bit oat 32bit oat 32bit oat
16bit integer 16bit integer 16bit integer 32bit integer String(32) String(8) String(16) String(8)
-
-
-
-
­0=Inactive, 1=Active 0=Inactive, 1=Active 0=Inactive, 1=Active See Table Below “DHC-XXX-XXX” “XXXXX” “X.X.X” “XXXXXX
Error Flags
Display Errors
EADR ouEr Undr ER 1 ER 2 ER 3 ER 4 ER 5 ER 6 ER 7
Bit Position Description
0 1 2 3 4 5 6 7 8 9
Invalid Address Over Range Under Range Sensor Range Exceeded Sensor Error No Sensor User Settings Invalid Factory Settings Invalid External Memory Failure Internal Memory Failure
Holding Registers
INPUT REGISTERS Register Description Data Type Range
0001-0016 0017
Device Name Process Mode
String(32) 16bit integer
“DHC” 0=Pressure, 1=Velocity, 2=Flow
0018
Pressure Unit
16bit integer
0=inWC, 1=ftWC, 2=mmWC, 3=cmWC, 4=PSI, 5=inHG, 6=mmHg, 7=mBar, 8=Pa,
9=kPa, 10=hPa, 11=ozin
0019 0020 0021-0022 0023-0024 0025-0026 0027-0028 0029
Velocity Unit Flow Unit Velocity K-Factor Flow Area Process Output Low Process Output High Voltage Output Range
16bit integer 16bit integer
32bit oat 32bit oat 32bit oat 32bit oat
16bit integer
0=ft/min, 1=m/s
3
/min, 1=m3/hr
0=ft
0.001-9.999
0.125-25ft
2
(0.0116-2.3226m2)
-
­0=0-10V, 1=0-5V, 2=1-5V,
3=2-10V 0030 0031-0032 0033-0034 0035 0036-0037 0038-0039 0040 0041-0042 0043 0044-0045 0046 0047 0048 0049 0050 0051
Set Point 1 Enable Set Point 1 Trigger Value Set Point 1 Reset Value Set Point 2 Enable Set Point 2 Trigger Value Set Point 2 Reset Value Enable Alarm High Limit High Alarm Limit Enable Alarm Low Limit Low Alarm Limit Manual Alarm Reset Power Up Alarm Inhibit Alarm Delay Alarm High Limit Status Alarm Low Limit Status Relay 1 Source
16bit integer
32bit oat 32bit oat
16bit integer
32bit oat 32bit oat
16bit integer
32bit oat
16bit integer
32bit oat
16bit integer 16bit integer 16bit integer 16bit integer 16bit integer 16bit integer
0=False, 1=True
-
-
0=False, 1=True
-
-
0=False, 1=True
-
0=False, 1=True
-
0=Disabled, 1=Enabled
0=Disabled, 1=Enabled
0-3600
0=Inactive, 1=active
0=Inactive, 1=active
0=Off, 1=Set Point 1, 2=Set
Point 2,
3=Any Alarm,
4=High Alarm Limit, 5=Low
Alarm Limit, 6=External Input 0052 0053
Relay 1 Action Relay 2 Source
16bit integer 16bit integer
0=Direct, 1=Reverse
0=Off, 1=Set Point 1, 2=Set
Point 2,
3=Any Alarm,
4=High Alarm Limit, 5=Low
Alarm Limit, 6=External Input 0054 0055 0056
Relay 2 Action Enable External Input External Input Type
16bit integer 16bit integer 16bit integer
0=Direct, 1=Reverse
0=False, 1=True
0=Normally Open,
1=Normally Closed 0057
External Input Activation
16bit integer
0-3600
Delay
0058
Damping Time
16bit integer
0-30
Pressure/Velocity/Flow Units: The unit selected is independent of the display unit.
Alarm High/Low Limit Status: The alarm status can be reset to inactive by writing
inactive to the status register. This is allowed only if Manual Alarm Reset is Enabled
and the process value no longer satises the alarm condition. In all other cases a
®
communications protocol error is returned.
Modbus
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Multi-Address Support
Multi-address support allows a register to be read or written to using different byte
orientations specied by the address range. For example, input register 0001 can also
be read at 2001, 4001 and 6001 with different byte orientations as listed in the table below. Registers that do not have multi-address support are only available in Big­Endian byte orientation (Modbus
Byte Order Address Range
Big-Endian Byte Swap Word Swap Little-Endian
0001-2000 2001-4000 4001-6000 6001-8000
®
communications protocol standard).
32bit Values 16bit Values
Register 1 Register 1 Register 1
MSB LSB MSB LSB
A B C D
B
C
D
A
D
D
A
C
B
A
C
B
B
A
A
B
B A B A
MAINTENANCE
Upon nal installation of the Series DHC, no routine maintenance is required. The Series DHC is not eld serviceable and should be returned if repair is needed. Field
repair should not be attempted and may void warranty.
This symbol indicates waste electrical products should not be disposed
of with household waste. Please recycle where facilities exist. Check with
your Local Authority or retailer for recycling advice.
WARRANTY/RETURN
Refer to “Terms and Conditions of Sale” in our catalog and on our website. Contact customer service to receive a Return Materials Authorization (RMA) number before
shipping the product back for repair. Be sure to include a brief description of the
problem plus any additional application notes.
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MODE = PRESSURE
MENU MAPS
POWER ON
[RESET]
MENU LEGEND
PRESS MENU BUTTON
PRESS ENTER BUTTON
DISPLAY ALL
SEGMENTS
FIRMWARE
VERSION
MODEL
NUMBER
MODEL PRESSURE
RANGE
PRESS AND HOLD ENTER BUTTON
PRESS SPAL BUTTON
2s
2s
3s
3s
PRESS UP BUTTON
PRESS DOWN BUTTON
PRESS RST BUTTON
HOME SCREEN
OR
PIN ENABLED
MAIN MENUSPAL MENU
YES
OR CHANGE DIGIT
NEXT DIGIT (MOVE CARON)
OR
CORRECT
PIN
3s
NO
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MAIN MENU
CONFIGURE PIN
[0000 = DISABLED]
OR CHANGE DIGIT
NEXT DIGIT [MOVE CARON]
OPERATION MENU
SET POINT MENU
DISCARD
SAVE
HOME SCREEN
ALARM MENU
RELAY MENU
EXTERNAL INPUT MENU
DISPLAY MENU
CONNECTION MENU
CALIBRATION MENU
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OPERATION
MODE
MEASUREMENT
UNIT
OPERATION MENU
MAIN MENU
OPERATION MENU
[CONTINUED]
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OPERATION MENU
MODE = PRESSURE
[CONTINUED]
DISCARD
AVAILABLE WHEN
AVAILABLE WHEN
MODE = VELOCITY
OR FLOW
AVAILABLE WHEN
MODE = VELOCITY
PRESSURE
OUTPUT LOW
PRESSURE
OUTPUT HIGH
VELOCITY K-FACTOR
VELOCITY
OUTPUT LOW
VELOCITY
OUTPUT HIGH
SAVE
OR CHANGE DIGIT
NEXT DIGIT [MOVE CARON]
DISCARD
SAVE
OR CHANGE DIGIT
NEXT DIGIT (MOVE CARON)
AVAILABLE WHEN
MODE = FLOW
DUCT AREA
FLOW OUTPUT
LOW
FLOW OUTPUT
HIGH
OPERATION MENU
[CONTINUED]
DISCARD
SAVE
OR CHANGE DIGIT
NEXT DIGIT (MOVE CARON)
DISCARD
SAVE
OR CHANGE DIGIT
NEXT DIGIT [MOVE CARON]
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VO
LTAGE OUTPUT
RANGE
OPERATION MENU
[CONTINUED]
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MAIN MENU
SET POINT 1
ENABLE
SET POINT 2
ENABLE
SET POINT MENU
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MAIN MENU
ALARM HIGH
LIMIT ENABLE
ALARM LOW
LIMIT ENABLE
ALARM MENU
ALARM RESET
TYPE
ALARM INHIBIT
ENABLE
ALARM DELAY
DISCARD
SAVE
OR CHANGE DIGIT
NEXT DIGIT [MOVE CARON]
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MAIN MENU
RELAY MENU
RELAY 1 SOURCE
RELAY 2 SOURCE
RELAY MENU [CONTINUED]
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IF RELA
IF RELA
IF RELA
IF RELA
RELAY 1 ACTION
Y 1 SOURCE = SP1, SP2, OR EXT
RELAY 1 ACTION
Y 1 SOURCE = AL, ALHI, OR ALLO
RELAY MENU [CONTINUED]
RELAY 2 ACTION
Y 2 SOURCE = SP1, SP2, OR EXT
RELAY 2 ACTION
Y 2 SOURCE = AL, ALHI, OR ALLO
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MAIN MENU
EXTERNAL INPUT
ENABLE
EXTERNAL INPUT
TYPE
EXTERNAL INPUT MENU
EXTERNAL INPUT
DELAY
DISCARD
SAVE
OR CHANGE DIGIT
NEXT DIGIT [MOVE CARON]
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ALARM MENU
MAIN MENU
PEAK PROCESS
VALUE
VALLEY PROCESS
VALUE
PROCESS DISPLAY
DAMPING TIME
RESET PEAK
VALUE
RESET VALLEY
VALUE
DISCARD
SAVE
OR CHANGE DIGIT
NEXT DIGIT [MOVE CARON]
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PROTOCOL SELECTION
CONNECTION MENU
DISCARD
MAIN MENU
DEVICE
ADDRESS
SERIAL
BAUD RATE
SAVE
OR CHANGE DIGIT
NEXT DIGIT [MOVE CARON]
CONNECTION MENU
[CONTINUED]
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SERIAL PARITY
OPERATION MENU
[CONTINUED]
AVAILABLE WHEN
PROTOCOL SELECTION = MODBUS
AND
SERIAL BAUD RATE ≠ AUTO
®
SERIAL STOP BITS
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MAIN MENU
ZERO
CALIBRATION
SPAN
CALIBRATION
CALIBRATION MENU
1sec
1sec 1sec
1sec
RESTORE
FACTORY SETTINGS
1sec
1sec 1sec
1sec
DEVICE REBOOTS AFTER 5 SECONDS
SERIAL NUMBER
DISPLAY [PART 1]
SERIAL NUMBER
DISPLAY [PART 2]
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SPAL MENU
DISCARD
MAIN MENU
AVAILABLE
WHEN SET POINT 1
ENABLE = ON
AVAILABLE
WHEN SET POINT 2
ENABLE = ON
SET POINT 1
TRIGGER
SET POINT 1
RESET
SET POINT 2
TRIGGER
SAVE
OR CHANGE DIGIT
NEXT DIGIT [MOVE CARON]
DISCARD
SAVE
OR CHANGE DIGIT
NEXT DIGIT [MOVE CARON]
DISCARD
SAVE
OR CHANGE DIGIT
NEXT DIGIT [MOVE CARON]
DISCARD
AVAILABLE
WHEN ALARM LOW
LIMIT ENABLE= ON
AVAILABLE WHEN ALARM HIGH LIMIT ENABLE = ON
SET POINT 2
RESET
ALARM LOW
LIMIT
ALARM HIGH
LIMIT
SAVE
OR CHANGE DIGIT
NEXT DIGIT [MOVE CARON]
DISCARD
SAVE
OR CHANGE DIGIT
NEXT DIGIT [MOVE CARON]
DISCARD
SAVE
OR CHANGE DIGIT
NEXT DIGIT [MOVE CARON]
Modbus® is a registered trademark of Schneider Automation, Inc.
Printed in U.S.A. 6/22 FR# 444618-00©Copyright 2022 Dwyer Instruments, Inc.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 MICHIGAN CITY, INDIANA 46360, U.S.A.
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