Dwyer Instruments GSTC Series Supplement

The Series GSTC Carbon Monoxide/Nitrogen Dioxide Gas Transmitter

monitors the gas concentration in underground parking garages and loading docks.

The carbon monoxide transmitter is used to measure the exhaust of gasoline

engines, while the nitrogen dioxide transmitter is used for diesel engines. The

Series GSTC is compatible with either BACnet or MODBUS®communication

protocol, allowing the transmitter to be used with almost any building management

controller. The GSTC output is communicated over an RS-485 wire via BACnet or

MODBUS® communication protocol. To maximize the accuracy of the Series GSTC,

the sensor can be field-calibrated using the A-449 remote LCD display. When the

sensor reaches the end of its life, the display will indicate that the sensor needs to

be replaced.

BACnet and MODBUS®communication protocol recommend limiting the number of

nodes in any segment to 32. Therefore, the transceiver may be rated at one unit

load. Fractional loads are also acceptable. The Series GSTC accounts as an

eighth of a load on the MSTP network.

INSTALLATION

• The transmitter should be mounted at normal breathing height, approximately 5

to 6 ft above the floor.

• The unit may be mounted in the horizontal or vertical position. It should be

mounted in an area that is shielded from direct contact with the elements or direct

sunlight.

• Mount in an area that will prevent the sensor from having any direct contact with

water.

• The unit should be placed in an area that will give an average of the air quality.

Do not place the unit so it will receive direct engine exhaust. Prolonged exposure

to direct engine exhaust may damage the sensor.

Series GSTC Carbon Monoxide/Nitrogen Dioxide Gas Transmitter

Specifications - Installation and Operating Instructions

Bulletin AQ-GSTC

DWYE INST UMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]

SPECIFICATIONS

Sensor: Field replaceable

electrochemical, 4 years typical

lifespan.

ange: CO: 0 to 500 PPM, NO2: 10

PPM.

Output Drift: <5% per year in air.

Coverage Area: 5000 to 7500 sq ft

typical.

Accuracy: CO: 2% FS, NO2: 3% FS,

at the time of calibration.

esolution: CO: 1 PPM; NO2: 0.1

PPM.

Temperature Limits: -4 to 122°F (-20

to 50°C).

Storage Temperature: For best

sensor life, 32 to 68°F (0 to 20°C).

Humidity Limits: 15 to 90% R

constant; 0 to 99% R intermittent.

esponse Time: <45 s to 90% CO,

<25 s to 90% NO2.

Span and Zero Adjustment: Via

pushbutton, using optional A-449

display. Zero only via BACnet or

MODBUS®communication protocol.

Housing: UV resistant glass filled

polycarbonate.

Output Signals: BACnet MS/TP or

MODBUS®RTU (switch selectable)

communication protocol.

Power equirements: 10 to 36 VDC

or isolated 21.6 to 33 VAC.

Electrical Connection: Removable

terminal block, knock outs for conduit

fitting.

Calibration: Via pushbuttons using A-

449 auxiliary display. Span gas

concentration is field selectable.

Enclosure ating: IP64.

Weight: 1 lb (0.45 kg).

Agency Approvals: CE.

Disconnect power supply before installation to prevent electrical

shock and equipment damage. Make sure all connections are in

accordance with the job wiring diagram and in accordance with national and local

electrical codes. Use copper conductors only.

WA NING

Use electrostatic discharge precautions (e.g., use of wrist

straps) during installation and wiring to prevent equipment

damage.

Avoid locations where severe shock or vibration, excessive

moisture, or corrosive fumes are present.

Do not exceed ratings of this device, permanent damage not

covered by warranty may result.

These are general guidelines. Local laws or ordinances will take

precedence.

NOTICE

3-45/64

[94.06]

3-1/8

[107.95]

2-15/64

[56.75]

4-17/32

[115.09]

5-7/64

[129.78] 3-59/64

[100]

2-15/64

[57]

2-55/64

[73]

3-23/64

[85]

Wall Mount Duct MountWall Mount

Without LCD

Duct MountWall Mount

With LCD

Figure 1 shows the location of the wiring terminal, 8 position DIP Switch SW1, used

for configuring the RS-485 address, the 4 position DIP Switch SW2, used for

configuring hardware and software options, sensor, span and zero adjustments,

and status LEDs.

The device provides three LEDs to indicate status and activity. The LEDs are

located to the right of DIP Switch SW1. The yellow LED indicates that the unit is

sending a BACnet or MODBUS®communication protocol. The green LED indicates

the unit is receiving a BACnet or MODBUS®communication protocol addressed to

this specific device. The red LED will flash once periodically if the BACnet or

MODBUS® communication protocol address is set incorrectly or the red LED will

flash twice periodically if the auto serial configuration is in progress.

Sensor

Span

Zero

Status

LEDs

Wiring

Terminal

DIP Switch

SW1

DIP Switch

SW2

Figure 1

The electrochemical sensors should be stored in an

environment with a minimum humidity level of 20% R . If the

sensor dries out, replacements will not be covered under warranty, but they can be

revived by allowing them to stabilize in an environment above 40% R for 10 days.

Once revived, they need to be recalibrated before use.

NOTICE

Figure 3 shows how to connect the GSTC in a network containing a common

power supply. Use a cable containing two twisted pairs. One pair is to be used for

the power and common. The other pair is to be used for A(-) and B(+). Attach the

shields together with a wire nut. This configuration is not suitable for AC supplies.

Use a DC supply only. Care should be taken that there are not too many devices

powered from the same supply as voltage drops will occur in the wiring. If you have

many devices, or have long cable runs, the local supply configuration, shown in

Figure 4, may be a better choice.

Figure 4 shows how to connect the GSTC in a network containing individual local

supplies. Use a cable containing a single conductor and a twisted pair. The single

conductor is to be used for common, and the pair is to be used for A(-) and B(+).

Attach the shields together with a wire nut. Both AC and DC supplies are suitable

for this configuration.

All devices in the network should be daisy-chained. Star connections and T

connections are not permitted.

The A(-) and B(+) lines must be terminated at both ends with a 120 ohm resistor.

If the GSTC is an end device it has an on-board resistor that may be used. See

Table 1 to enable it.

The network must be biased properly. If needed, there are bias resistors on-board

the GSTC. No more than two sets of bias resistors should be enabled in the

network. See Table 1 to enable them.

TO NEXT

DEVICE

B(+)

A(-)

PWR

COM

TO PREVIOUS

DEVICE

B(+)

A(-)

PWR

COM

ATTACH SHIELDS

TOGETHER W/WIRE NUT

PWRCOM A(-) B(+)

1234

Figure 3 - Common Power Supply

B(+)

A(-)

B(+)

A(-)

COM

TO PREVIOUS

DEVICE

TO NEXT

DEVICE

ATTACH SHIELDS

TOGETHER W/WIRE NUT

PWRCOM A(-) B(+)

1234

Figure 4 - Local Power Supply

Figure 2

Wall Mounting

1. Remove the cover plugs from the face of the unit and the top cover.

2. Disconnect the display cable from the USB connector on the main circuit board

(if present).

3. Remove the desired conduit fitting knock out and install conduit fitting (not

provided).

4. Position the transmitter where it is to be mounted and mark the mounting holes

in each corner of the housing.

5. Drill or punch out marked locations.

6. Place the transmitter box over mounting holes on wall and align. Install wall

mount screws (not provided) in mounting holes.

7. Proceed with wiring diagrams according to Figures 3 and 4.

8. Set DIP Switches SW1 and SW2 as desired. Refer to Figure 5, Figure 6, and

Appendix I.

9. Reconnect the LCD cable to the USB port on the main circuit board (if present).

10. Replace cover and cover plugs on the face of the unit.

CO:

Locate GSTC carbon monoxide transmitter about 5 ft (1.5 m) off the floor. Carbon

monoxide weighs about the same as air and distributes evenly throughout the

monitored space. Install GSTC CO alarm at least 15 to 20 ft (4.6 to 6.1 m) away

from boiler or fuel burning heat source. Avoid extremely dusty, dirty, humid or

greasy areas. Do not place in direct sunlight or areas subjected to extreme

temperature. Do not place in turbulent air, near fans, heat vents, air conditioners,

air returns or open windows. Blowing air may prevent CO from reaching the CO

sensor.

NO2:

NO2sensors should be mounted in the breathing zone, 4 to 6 ft (1.2 to 1.8 m) from

the floor. This is primarily because NO2is a poisonous gas which should be

detected in the area where people would be exposed to it, but also because 4 to 6

ft from the floor is an appropriate elevation to detect NO2gas.

Duct Mounting

Duct mounting kit includes an air flow pitot tube, air filter with barbed connections,

two short pieces of tubing, and one long piece of tubing.

1. Mount the pitot tube into the duct observing the flow direction marked on the pitot

tube.

2. Attach the two short pieces of tubing to the barbed connections on each side of

the air filter. See Figure 2.

3. Attach the remaining side of one of the short pieces of tubing to the barbed

connection on the transmitter.

4. Attach the remaining side of the other short piece of tubing to the high port on

the pitot tube.

5. Attach the long piece of tubing to the open barbed connection on the transmitter.

6. Attach the other end of the long tubing to the low port on the pitot tube.

WI ING

Wiring should comply with Electrical Characteristics of

Generators and Receivers for Use in Balanced Digital Multipoint

Systems, TIA-EIA-485-A-1998, Telecommunications Industry Association, 1998.

NOTICE

BACnet installations should comply with ANSI/AS RAE

Standard 135-2010 BACnet A Data Communication Protocol for

Building Automation and Control Networks, American Society of eating,

Refrigerating and Air-Conditioning Engineers, Inc., 2010.

NOTICE

MODBUS®communication protocol installations should comply

with MODBUS®communication protocol over Serial Line

Specification and Implementation Guide V1.02, MODBUS®Organization, Inc., 2006.

NOTICE

Communication wiring must be in a daisy-chain fashion. Star

connections are not permitted.

NOTICE

Cable shield must be connected to earth ground at one location

only.

NOTICE

Figure 5

Figure 6

Switch

1 - Protocol

2 - B(+) Bias Resister

3 - A(-) Bias Resister

4 - Terminating Resister

MODBUS®

511Ω Pull-up to 5V

511Ω Pull-down to GND

120Ω between A(-) and B(+)

Off

BACnet

Pull-up not connected

Pull-down not connected

Open

Table 1: Dip Switch SW2 Functions

Protocol

BACnet

MODBUS®

Supported Baud ates

9600

19200

38400

57600

76800

115200

Data Size

Table 2: Supported Configurations

Parity

None

Even

Odd

None

Stop Bits

Figure 7

Text

Secondary

Display

Primary

Display

Text

Numeric

Menu Name

BAC or MOD

CAL

AUT

RST

Value

xxx ADR

xxx PPM

OFF

YES

Description

RS-485 address (view only)

Current CO or NO2 concentration

Auto-baud will start and return to the main menu

Starts the manual serial configuration menu sequence

Will reset settings to factory default

Table 3: Standard Menu Options

Dip Switch Configurations

Use DIP Switch SW1 (see Figure 5) to configure the RS-485 address of the device.

A valid address depends on the protocol selected. Valid BACnet addresses range

from 1 to 127. Valid MODBUS®communication protocol addresses range from 1 to

247. By default, the device is shipped with MODBUS® communication protocol

selected and the address set to 127, as shown in Figure 5. A valid and unused

address should be set before connecting to an existing network. See Appendix I to

configure the required address using DIP Switch SW1. The device will not function

properly if an invalid address is set. During the power up sequence, the LCD (if

present) will display the RS-485 address as the primary value and either “BAC” to

indicate BACnet or “MOD” to indicate MODBUS® communication protocol as the

primary text. If the RS-485 address is invalid, the invalid address is shown as the

primary value with “ERR” as the primary text, and the red LED will periodically blink

once.

Use DIP Switch SW2 (see Figure 6) to configure other hardware and software

options. Table 1 shows available options. Table 2 shows supported configurations

for either BACnet or MODBUS®communication protocol.

Auto Serial Configuration

Use the auto serial configuration to enable the device to determine the baud rate,

parity, and stop bits directly from the serial traffic. After a valid RS-485 address is

chosen, the GSTC can be quickly and easily deployed. The auto serial

configuration procedure assumes a serial configuration appropriate to the chosen

protocol, shown in Table 2. Otherwise, the serial communication must be

configured manually in the setup menu.

To activate auto serial configuration, set a valid RS-485 address using DIP Switch

SW1, connect the serial bus, common and power wires, and apply power. The

device will power up and begin examining the serial bus for communication.

When the device is installed offline or away from the main network, it is necessary

to generate the appropriate traffic in order to configure the serial communication

whether BACnet or MODBUS®communication protocol is selected. While the serial

configuration is in progress, the device may not respond. The device may require

multiple read requests to complete the serial configuration process.

The auto serial configuration process is completed once a message addressed to

the device is received and processed successfully. If the serial configuration of the

bus changes, a power cycle of the device is required to restart the auto serial

configuration process.

More detailed information for BACnet protocol can be found in Appendix II, and

information for MODBUS®communication protocol can be found in Appendix III.

The menu is only shown if a display is present. Figure 7 below outlines the display

components. To enter the menu, press and hold both the SPAN and ZERO

pushbuttons for at least 3 seconds. The menu descriptions and list of the available

values for each standard menu item is shown on in Table 3. Table 4 lists the

available values for each manual menu item.

Standard Menu Descriptions

BAC or MOD: Displays the RS-485 address

CAL: Start user CO or NO2 calibration process

AUT: Auto serial configuration enabled

RST: Reset settings to factory default

Manual Menu Descriptions

BAU: Baud rate selection (only available if AUT = OFF)

PAR: Parity selection (only available if AUT = OFF)

STP: Stop bits selection (only available if AUT = OFF)

Menu Navigation

A menu flowchart, located in Appendix IV, illustrates the navigation process.

1. Press and hold the SPAN pushbutton while in the menu to move to the previous

menu item.

2. Press and hold the ZERO pushbutton while in the menu to move to the next

menu item.

3. Press and hold both the SPAN and ZERO pushbuttons for 5 seconds to activate

the current menu item. In the lower left corner of the display “SET” is shown to

indicate a setting change.

4. Press and hold either the SPAN or ZERO pushbutton to change the setting.

5. Press and hold both the SPAN and ZERO pushbuttons for 5 seconds to accept

the setting.

6. After 30 seconds of inactivity, the display will return to normal operation.

Menu Name

BAU

PAR

STP

Value

9600

19200

38400

57600

76800

115200

EVE

ODD

NON

Description

Only available if AUT = OFF

Table 4: Manual Menu Options

Sensors contain acid and are harmful if handled improperly. Do

not attempt to open sensors. Sensors should be disposed of

according to local laws.

WA NING

Figure 9

Figure 10

Switch Positions

Address Value

128

Table 5: DIP Switch Values

The minimum possible address would be 0 when all DIP

switches are in the “OFF” position, and the maximum possible

address would be 255 when all DIP switches are in the “ON” position. When BACnet

protocol is selected the transmitter only has valid address from 1 to 127. When

MODBUS®communication protocol is selected the transmitter only has valid address

from 1 to 247. Any address outside the selected protocol’s range will give an error.

NOTICE

Object Type

Device

Analog Input

Binary Value

Date Value

Dynamically

Creatable

Dynamically

Deletable

Object

Identifier

607xxx

AI1

BV1

DV1

DV2

Object

Name

GSTC

CO Concentration

NO2 Concentration

Zero Sensor

Calibration Date

Replace Sensor Date

Table 6: Supported BACnet Objects

SENSO EPLACEMENT

A replacement sensor is available from Dwyer Instruments, Inc.

For CO, order part number: A-505.

For NO2, order part number: A-506.

eplacing The Sensor

1. Remove the cover plugs from the face of the unit and top cover. Locate the

sensor, see Figure 1. The sensor is mounted on three pin sockets. The circuit

board is either labeled “CO SENSOR” or “NO2 SENSOR” underneath the sensor.

2. Remove and discard the used sensor.

3. Remove the shorting wire spring located at the bottom of the new sensor.

4. Install the new sensor into the three pin sockets.

5. The unit must be re-calibrated whenever a new sensor is installed.

6. Allow 30 minutes for the unit to come to temperature equilibrium prior to

calibration. The unit has internal temperature compensation, and the sensor must

be at the same temperature as the unit to calibrate properly.

CALIB ATION

Figure 8, located after Appendix III, shows how to set up a GSTC for calibration

with an auxiliary display. An auxiliary display is required for calibration unless an

LCD model of the GSTC was purchased. The procedure in Appendix IV shows how

to set the range, and calibrate the span and zero adjustments.

MAINTENANCE/ EPAI

Upon final installation of the Series GSTC, no routine maintenance is required with

the exception of sensor replacement and calibration. As with all electrochemical

type gas sensors, routine calibration is required. It is recommended that units be

re-calibrated at 6 month intervals, to maintain the published accuracy, or as

required by local ordinances or other requirements. The units will maintain 5%

accuracy if they are re-calibrated at 12 month intervals.

Except for the sensor replacement and calibration, the Series GSTC is not field

serviceable and should be returned if repair is needed. Field repair should not be

attempted and may void warranty.

WA ANTY/ ETU N

Refer to “Terms and Conditions of Sales” in our catalog and on our website.

Contact customer service to receive a Return Goods Authorization number before

shipping the product back for repair. Be sure to include a brief description of the

problem plus any additional application notes.

Appendix I: Setting the S-485 Address

The address assignment is determined by adding the values for each of the

switches that are in the “ON” position. The transmitter comes from the factory with

all of the DIP switches in the “ON” position, except position 1 as shown in Figure 9

below.

The address of the transmitter in Figure 9 is 127. This final value is determined by

adding the individual values of the DIP switches together. The values for each DIP

switch are shown below in Table 5. When adding the individual values for Figure 9,

0+64+32+16+8+4+2+1=127, which is the correct factory setting.

Another example would be if the desired address was 53. The only DIP switches

in the “ON” position would be switches 3, 4, 6, and 8 as shown in Figure 10 below.

By adding the individual values of each switch in the “ON” position,

0+0+32+16+0+4+0+1=53, the desired address is obtained.

Appendix II: BACnet Protocol

The GSTC supports objects that are listed below. Table 6 and Table 7 outlines

each item.

Property

Object Identifier

Object Name

Object Type

System Status

Vendor Name

Vendor Identifier

Model Name

Firmware Revision

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

Retries

Max Master

Max Info Frames

Devices Address

Binding

Database Revision

Serial Number (1000)

Default

Value

607xxx

“GSTC 607xxx”

DEVICE (8)

Operational (0)

“Dwyer

Instruments, Inc”

607

“GSTC-C” or

“GSTC-N”

“?.?”

“”

“CO Detector” or

“NO2 Detector”

See pics

See Table 2

128

NO_SEGMENTAT

ION (3)

127

Empty

“xxxxxx”

Property Data

Type

BACnetObjectId

entifier

CharacterString

(32)

BACnetObjectT

ype

BACnetDeviceS

tatus

CharacterString

Unsigned

CharacterString

(32)

CharacterString

(32)

Unsigned

BACnetServices

Supported

BACnetObjectT

ypesSupported

BACnetArray

Unsigned

BACnetSegmen

tation

Unsigned

BACnetAddress

Binding

Unsigned

CharacterString

Access

Read/Write

Read

Read/Write

Read

Read/Write

Read

Table 7: Object Properties

Property

Object

Identifier

Object Name

Object Type

Present Value

Status Flags

Event State

Reliability

Out of

Service

Units

Default Value

AI1

“CO Concentration” or

“NO2 Concentration”

ANALOG_INPUT (0)

Current reading

NORMAL (0)

NO_FAULT_DETECTED(0)

FALSE (0)

Parts-per-million (96)

Property Data Type

BACnetObjectIdentifier

CharacterString

BACnetObjectType

Real

BACnetStatusFlags

BACnetEventState

BACnetReliability

Boolean

BACnetEngineeringUnits

Table 8: Analog Input

Access

Read

Read/Write

Read

Property

Object

Identifier

Object Name

Object Type

Present Value

Status Flags

Event State

Reliability

Out of

Service

Default Value

BV1

“Zero Sensor”

BINARY VALUE (5)

NORMAL (0)

NO FAULT DETECTED (0)

FALSE (0)

Property Data Type

BACnetObjectIdentifier

CharacterString

BACnetObjectType

Real

BACnetStatusFlags

BACnetEventState

BACnetReliability

Boolean

Table 9: Binary Value

Access

Read

Read/Write

Property

Object

Identifier

Object Name

Object Type

Present Value

Status Flags

Event State

Reliability

Out of

Service

Default Value

DV1

“Calibration Date”

DATE VALUE (42)

????

{F,F,F,F}

NORMAL (0)

NO FAULT DETECTED (0)

FALSE (0)

Property Data Type

BACnetObjectIdentifier

CharacterString

BACnetObjectType

BACnetBinaryPV

BACnetStatusFlags

BACnetEventState

BACnetReliability

Boolean

Table 10: Date Value

Access

Read

Read/Write

Read

Read/Write

Property

Object

Identifier

Object Name

Object Type

Present Value

Status Flags

Event State

Reliability

Out of

Service

Default Value

DV2

“Replace Sensor Date”

DATE VALUE (42)

????

{F,F,F,F}

NORMAL (0)

NO FAULT DETECTED (0)

FALSE (0)

Property Data Type

BACnetObjectIdentifier

CharacterString

BACnetObjectType

BACnetBinaryPV

BACnetStatusFlags

BACnetEventState

BACnetReliability

Boolean

Access

Read

Read/Write

Read

Read/Write

Table 11: eplace Sensor Date

The default object identifier is 607xxx, where xxx is replaced by the address set by

the DIP Switch SW1. The object identifier value will change as the address

changes. When a specific object identifier is written via BACnet, that value is stored

and changes to the address will no longer affect the object identifier. The object

name reflects the current object identifier. When a specific object name is written

via BACnet, that value is stored and changes to the object identifier will no longer

affect the object name.

Table 8 outlines the Analog Input (AI1) object which represents the current CO or

NO2 concentration reading in parts per million.

Table 9 outlines the Binary Value (BV1) object which allows the sensor to be

remotely zeroed. When set to “ACTIVE”, the zero function will attempt to

recalibrate the zero point of the sensor.

Table 10 outlines the Date Value (DV1) object which stores the date when the

sensor was last calibrated. Since the GSTC does not track time this value must be

updated manually after calibration is performed in the field.

Table 11 outlines the Replace Sensor Date (DV2) object which stores the

suggested sensor replacement date. It is recommended to replace the sensor at

specific intervals because the sensor degrades over time. The GSTC does not

track time so this value must be updated manually after the sensor is replaced in

the field.

egister

0001

1000-1009

1010-1013

1014-1017

Description

CO or NO2 Concentration

in PPM

Model Number String

Serial Number String

Firmware Version String

Data Type

Unsigned 16 bit

integer

String

ange

0 – 500 PPM CO,

0 – 100 (0 – 10.0)

PPM NO2

“GSTC-C” or

“GSTC-N”

“xxxxxx”

“?.?”

Table 13: Input egisters

egister

0001

0500

Description

Zero Sensor

Reboot device

Data Type

Unsigned 16bit integer

ange

0 or 1

0 - Do Nothing

1 - Warm Reset

Value

0-1

Table 14: Holding egisters

Figure 8

Function Name

Read olding Registers

Read Input Registers

Write Single Register

Write Multiple Registers

Function Code

Table 12: Supported MODBUS®Functions

BACnet Services

The GSTC supports the Device Communication Control Service BIBB. The option

time duration in minutes is also supported. This device is configured with a

password that must be provided to successfully execute the command. The

password is “Dwyer”.

The GSTC also supports the Reinitialize Device Service BIBB. The supported

device states are “COLDSTART” and “WARMSTART”. All other states return an

error. This device is configured with a password that must be provided to

successfully execute the command. The password is “Dwyer”.

Appendix III: MODBUS®Communication Protocol

The GSTC supports functions and input registers that are listed below. Table 12 ,

Table 13, and Table 14 outline each item.

The string data type is read as a stream of ASCII characters with the first character

sent in the MSB of the first register and the second character sent in the LSB of the

first register and so on. If the string is shorter than the allotted size, the remaining

bytes will be zero padded.

Writing 1 to the Zero Sensor register will re-zero the sensor just as if the user has

pressed the zero pushbutton.

The Reboot Device register allows a MODBUS®communication protocol master to

remotely request this device to perform a warm reset. When a value of 1 is written

to this register the device will respond with success. The reset will take

approximately 5 seconds after the command was received. Writing a value of 0 to

this register has no effect.

ADR

PPM

MO D

SEN

PPM

CAL

SCROLL

AUT

AUT AUT AUT

AUT AUT

BAU BAU

SCROLL

PAR PAR PAR

STP STP

SET BAUD RATE

SET PARITY

SET STOP BITS

RST RST RST

NOTE - WHEN IN THE MENU, THE

DISPLAY WILL RETURN TO THE

HOME POSITION IF NO KEY IS

PRESSED WITHIN 30 SECONDS.

HOME POSITION, UNIT READS GAS

CONCENTRATION PPM

PRESS AND HOLD ZERO AND SPAN

KEYS FOR 5 SECODNS TO ENTER

THE MAIN MENU.

MODBUS/BACNET ADDRESS.

VIEWABLE ONLY.

CALIBRATION

MODE

PRESS ZERO AND SPAN TO ENTER CALIBRATION MODE

PRESS THE ZERO KEY FOR 5 SECONDS. THE

ZERO VALUE IS STORED AND THE DISPLAY

SEQUENCES TO THE SPAN GAS CALIBRATION VALUE PRESS AND HOLD THE SPAN KEY FOR 5 SECONDS

DISPLAY READS “CAL” THEN “PASS” AND RETURNS TO HOME POSITION

IF THE SENSOR OUTPUT IS NO LONGER

SUFFICIENT FOR CALIBRATION, THEN

THE DISPLAY READS “BAD SEN”. THE

SENSOR MUST BE REPLACED

PRESS AND HOLD ZERO AND SPAN UNTIL

“SET” TURNS OFF

TO ADJUST THE DISPLAY TO SET

THE DESIRED SPAN CALIBRATION VALUE,

PRESS THE DIGIT KEY TO SCROLL

THROUGH THE DIGITS. THE DIGITS WILL

BLINK AS THEY ARE SELECTED.

ADJUST THE VALUE OF THE DIGIT

USING THE VALUE KEY

HOOK UP THE UNIT TO THE SPAN CALIBRATION GAS

USING THE CALIBRATION ADAPTER A-507AS SHOW IN FIG. 8

SPAN GAS FLOW IS TO BE BETWEEN 0.5 TO 10. SLPM.

ALLOW GAS TO FLOW FOR AT LEAST 3 MINUTES.

PLACE THE UNIT IN AN AREA THAT CONTAINS FRESH

AIR (NO CO OR NO2 GAS). ALLOW 3 MINUTES TO

STABILIZE.

COMMUNICATION

SETTINGS

FACTORY SETTING IS

AUTO BAUD ON.

PRESS AND HOLD ZERO AND SPAN UNTIL

“SET” TURNS ON

PRESS ZERO OR SPAN TO SWITCH

BETWEEN AUTO BAUD ON OR OFF

AUTOBAUD MUST BE SET TO “NO” TO SET

BAUDRATE, PARITY AND STOP BIT SETTINGS

PRESS AND HOLD ZERO AND SPAN UNTIL

“SET” TURNS OFF

PRESS AND HOLD ZERO AND SPAN UNTIL

“SET” TURNS OFF

USING ZERO AND SPAN KEYS, SET BAUDRATE

TO DESIRED VALUE

PRESS AND HOLD ZERO

AND SPAN UNTIL

“SET” TURNS OFF

PRESS ZERO OR SPAN TO SWITCH

BETWEEN NO PARITY OR EVEN OR

ODD PARITY

PRESS AND HOLD ZERO AND SPAN UNTIL

“SET” TURNS ON

PRESS AND HOLD ZERO AND SPAN UNTIL

“SET” TURNS ON PRESS AND HOLD ZERO AND SPAN UNTIL

“SET” TURNS OFF

USING ZERO AND SPAN KEYS, SET STOP BIT

TO 1 OR 2

IF RESET IS SET TO YES, PRESSING ZERO AND SPAN

WILL CAUSE A FACTORY RESET, AND DISPLAY WILL

RETURN TO THE HOME POSITION

IF RESET IS SET TO NO, PRESSING ZERO AND SPAN

PRESS ZERO OR SPAN TO SWITCH

BETWEEN YES OR NO

PRESS AND HOLD ZERO AND

SPAN UNTIL “SET” TURNS ON

RESET UNIT

TO FACTORY

DEFAULTS

SCROLL TO TOP

MENU, MODBUS/BACNET

ADDRESS

SPAN

DIGIT

ZERO

VALUE

SPAN

DIGIT

ZERO

VALUE

ZERO

VALUE

SPAN

DIGIT

ZERO

VALUE

SPAN

DIGIT

ZERO

VALUE SPAN

DIGIT

SPAN

DIGIT

ZERO

VALUE

ZERO

VALUE

SPAN

DIGIT

ZERO

VALUE SPAN

DIGIT

ZERO

VALUE

SPAN

DIGIT

ZERO

VALUE

SPAN

DIGIT

ZERO

VALUE

ZERO

VALUE

SPAN

DIGIT

ZERO

VALUE

SPAN

DIGIT

SPAN

DIGIT

ZERO

VALUE

ZERO

VALUE

SPAN

DIGIT

ZERO

VALUE

SPAN

DIGIT

ZERO

VALUE

SPAN

DIGIT SPAN

DIGIT

ZERO

VALUE

ZERO

VALUE

SPAN

DIGIT

ZERO

VALUE

SPAN

DIGIT

SPAN

DIGIT

ZERO

VALUE

SPAN

DIGIT

ZERO

VALUE

ZERO

VALUE

SPAN

DIGIT

ZERO

VALUE

SPAN

DIGIT

SPAN

DIGIT

ZERO

VALUE

Appendix IV: Menu Flowchart and Calibration

DWYE INST UMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]

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