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: [phone]

Fax: [phone]

www.dwyer-inst.com

e-mail: [e-mail]

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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Phone: [phone]

Fax: [phone]

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