Carrier B6 Series User manual

Toxic/Combustible Gas Transmitter B6
Specification
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 1of 16
Overview
The B6 Series Toxic/Combustible Gas Detectors use various sensing technologies to
detect a wide assortment of gases. These units are housed in a NEMA 4X rated plastic
enclosure that will meet a wide variety of applications. The combo unit consists of a
main unit (Carbon Monoxide only) with an LCD, LED status indication, 3 user
configurable relays and a remote sensing unit (various gas types available) for
installation at high or low elevations based on the density of the gas being detected.
The main and remote unit gas concentrations levels are both displayed on the main
unit’s LCD. This series also features a sensor module that can be easily replaced by
removing a couple of screws and unplugging the existing module before inserting the
new factory calibrated sensing module. All units should be verified for proper
functionality and calibration once the replacement sensor module has been reinstalled.
A user selectable password can be used to protect the system integrity.
Applications: Mechanical Rooms, Warehouses, Refrigeration Plants, Industrial Plants,
Process Monitoring, Leak Detection, Parking Garages, Auto/Truck Maintenance
Facilities, Oil and Gas Industry
Caution
It is your responsibility to ensure that the B6 Series will meet all of your applicable Federal, State,
Provincial and Local Health and Safety laws and regulations before using these products.
The B6 Series Gas Transmitters are covered by a Two (2) Year Limited Warranty against defects in material and
workmanship from the date of shipment with the exception of the Sensor Modules (Electrochemical/Toxic: Six Months and
Catalytic/ Combustible: One Year)
Part Numbers
N2-B6-CO/NO2-10P
Specifications
Supply Voltage:
VDC Supply Voltage: 24 VDC nominal (+18 to 30 VDC)
VAC Supply Voltage: 24 VAC nominal (+15 to 24 VAC) (AC Power must not be grounded)
Fuse Protection:
0.750A Polyswitch; (Resets after fault is cleared & power to circuit is removed)
Supply Current | Power
Consumption:
0.3A maximum | 8.4 VA
Communication Protocols: RS-485 Serial BACnetTM MS/TP (Master and Slave; Default: Master)
B6 Communication Baud Rates:
9600, 19200, 38400, 76800 Bits/Second (Default: 38400)
Factory Calibration Range:
See Gas Sensor Selection & Specification Table on back of data sheet
Display:
LCD Graphic Display with backlight (Displays: TWA, STEL and Concentration)
Keypad
Three Capacitive Touch sensing keys
Relays | Contact Type | Relay
Contact Ratings:
Three | SPDT (Form C) Dry Contacts | 1.0A max. @ 30 VDC or 0.3A max. @ 125 VAC
(Resistive Loads)

Toxic/Combustible Gas Transmitter B6
Specification
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 2of 16
Relay Life Expectancy:
Mechanical: 50,000,000 operations minimum @ 36,000 operations/hour
Electrical: 200,000 operations minimum @ rated load
Status LEDs:
Two Green LEDs (Tx/Rx Communication Status); Three Red LEDs (Relays 1, 2 & 3)
Buzzer:
80 dB at 3.94 (10 cm), 2700 Hz (3 Programmable Tones)
Warm Up Time:
24 Hours (Allow 24 hours before calibrating sensor after installation)
Sensor Type:
Main: Carbon Monoxide (CO)
Remote: See Gas Sensor Selection & Specification Table on back of data sheet
Gas Types:
Combustible, Toxic Gases/Oxygen Sensor & Infrared
Coverage Area | Mounting Height:
See Gas Sensor Selection & Specification Table on back of data sheet
Life Expectancy:
Electrochemical (Toxic): 2 to 3 Years, typical | Oxygen/Hydrogen (Toxic): 18 months,
typical
Catalytic (Combustible): 3 years, typical | CO: 7 years, typical
Infrared: >5 Years
Unit Shelf Life:
Electrochemical (Toxic): 6 months from date of purchase
Catalytic (Combustible): 1 year from date of purchase
Replacement Sensor Modules:
See additional on-line Product Literature or Contact Carrier
Recommended Maintenance:
Catalytic (Combustible): Accuracy & Bump test every 3 months or as required by Code
Electrochemical (Toxic): Accuracy & Bump test every 6 months or as required by Code
Oxygen/Hydrogen (Toxic): Calibrate every 3 months
Infrared: Accuracy and Bump Test yearly
Dimensional Drawing
Figure 1: Dimensional Drawing
Sensor Selection and Specification
Gas Type
Gas Span
Code Combustible Toxic
100%
LEL1
in % By
Vol.
Measurement
Range
Operating
Temp
°F (°C)
Square
Feet ft2
(m2)
Radius
ft (m)
Mounting
Height
Acetone
CH3CO-
100L
• 2.6% 0-100% LEL
14 to 122
(-10 to 50)
5000
(464.5)
40 (12.2) Low2
Ammonia NH3-100P • N/A 0-100 PPM
-22 to 122
(-30 to 50)
7500
(696.7)
49 (14.9) High2
Ammonia
NH3-
1000P
• N/A 0-1000 PPM
-22 to 122
(-30 to 50)
7500
(696.7)
49 (14.9) High2
Arsine ASH3-1P • N/A 0-1 PPM
-4 to 104
(-20 to 40)
5000
(464.5)
40 (12.2) Low2

Toxic/Combustible Gas Transmitter B6
Specification
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 3of 16
Gas Type
Gas Span
Code Combustible Toxic
100%
LEL1
in % By
Vol.
Measurement
Range
Operating
Temp
°F (°C)
Square
Feet ft2
(m2)
Radius
ft (m)
Mounting
Height
Benzene
C6H6-
100L
• 1.3% 0-100% LEL
14 to 122
(-10 to 50)
5000
(464.5)
40 (12.2) Low2
Iso-Butane
C4H10-
100L
• 1.8% 0-100% LEL
14 to 122
(-10 to 50)
5000
(464.5)
40 (12.2) Low2
Butanol, n-Butane
BUTAN-
100L
• 1.9% 0-100% LEL
14 to 122
(-10 to 50)
5000
(464.5)
40 (12.2) Low2
Carbon Dioxide
CO2-
5000P
Infrared Infrared N/A 0-5000 PPM
-4 to 122
(-20 to 50)
7500
(696.7)
49 (14.9) Mid2
Carbon Dioxide CO2-5V Infrared Infrared N/A 0-5% by Vol
-4 to 122
(-20 to 50)
7500
(696.7)
49 (14.9) Mid2
Carbon Dioxide CO2-20V Infrared Infrared N/A 0-20% by Vol
-4 to 122
(-20 to 50)
7500
(696.7)
49 (14.9) Mid2
Carbon Dioxide CO2-100V Infrared Infrared N/A 0-100% by Vol
-4 to 122
(-20 to 50)
7500
(696.7)
49 (14.9) Mid2
Carbon Monoxide CO-250P • N/A 0-250 PPM
-4 to 122
(-20 to 50)
7500
(696.7)
49 (14.9) Mid2
Carbon Monoxide
CO
-1000P • N/A 0-1000 PPM
-4 to 122
(-20 to 50)
7500
(696.7)
49 (14.9) Mid2
Chlorine CL2-5P • N/A 0-5 PPM -4 to 122
(-20 to 50)
5000
(464.5)
40 (12.2) Low2
Chlorine Dioxide CLO2-2P • N/A 0-2 PPM
-4 to 122
(-20 to 50)
5000
(464.5)
40 (12.2) Low2
Diborane B2H6-2P • N/A 0-2 PPM
-4 to 104
(-20 to 40)
5000
(464.5)
40 (12.2) Mid2
Ethylene
C2H4-
100L
• 2.7% 0-100% LEL
14 to 122
(-10 to 50)
5000
(464.5)
40 (12.2) Mid2
Ethylene Oxide ETO-20P • N/A 0-20 PPM
-4 to 122
(-20 to 50)
5000
(464.5)
40 (12.2) Low2
Germane GEH4-2P • N/A 0-2 PPM -4 to 104
(-20 to 40)
5000
(464.5)
40 (12.2) Low2
Hydrogen H2-1000P • N/A 0-1000 PPM
-4 to 122
(-20 to 50)
7500
(696.7)
49 (14.9) High2
Hydrogen H2-2000P • N/A 0-2000 PPM
-4 to 122
(-20 to 50)
7500
(696.7)
49 (14.9) High2
Hydrogen H2-100L • 4.0% 0-100% LEL
14 to 122
(-10 to 50)
7500
(696.7)
49 (14.9) High2
Hydrogen Bromide HBR-30P • N/A 0-30 PPM
-4 to 104
(-20 to 40)
5000
(464.5)
40 (12.2) Low2
Hydrogen Chloride HCL-30P • N/A 0-30 PPM
-4 to 122
(-20 to 50)
5000
(464.5)
40 (12.2) Mid2
Hydrogen Cyanide HCN-50P • N/A 0-50 PPM
-4 to 122
(-20 to 50)
5000
(464.5)
40 (12.2) Mid2
Hydrogen Sulfide H2S-25P • N/A 0-25 PPM
-4 to 122
(-20 to 50)
5000
(464.5)
40 (12.2) Low2
Hydrogen Sulfide H2S-100P • N/A 0-100 PPM
14 to 122
(-10 to 50)
5000
(464.5)
40 (12.2) Low2
Methane CH4-100L • 5.0% 0-100% LEL
14 to 122
(-10 to 50)
7500
(696.7)
49 (14.9) High2
Methanol
CH3OH-
100L
• 6.7% 0-100% LEL
14 to 122
(-10 to 50)
5000
(464.5)
40 (12.2) Low2

Toxic/Combustible Gas Transmitter B6
Specification
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 4of 16
Gas Type
Gas Span
Code Combustible Toxic
100%
LEL1
in % By
Vol.
Measurement
Range
Operating
Temp
°F (°C)
Square
Feet ft2
(m2)
Radius
ft (m)
Mounting
Height
Nitric Oxide NO-100P • N/A 0-100 PPM
-4 to 122
(-20 to 50)
7500
(696.7)
49 (14.9) Mid2
Nitrogen Dioxide NO2-10P • N/A 0-10 PPM
-4 to 122
(-20 to 50)
7500
(696.7)
49 (14.9) Low2
Oxygen3 O2-25V • N/A 0-25% by Vol
-22 to 122
(-30 to 50)
7500
(696.7)
49 (14.9) Mid2
Ozone O3-1P • N/A 0-1 PPM
-4 to 122
(-20 to 50)
5000
(464.5)
40 (12.2) High2
Iso-Pentane
C5H12-
100L
• 1.4% 0-100% LEL
14 to 122
(-10 to 50)
5000
(464.5)
40 (12.2) Low2
Phosphine PH3-1P • N/A 0-1 PPM
-4 to 104
(-20 to 40)
5000
(464.5)
40 (12.2) Low2
Phosphine PH3-5P • N/A 0-5 PPM
-4 to 104
(-20 to 40)
5000
(464.5)
40 (12.2) Low2
Propane
C3H8-
100L
• 2.1% 0-100% LEL
14 to 122
(-10 to 50)
7500
(696.7)
49 (14.9) Low2
Silane SiH4-50P • N/A 0-50 PPM
-4 to 104
(-20 to 40)
5000
(464.5)
40 (12.2) Mid2
Sulfur Dioxide SO2-6P • N/A 0-6 PPM -4 to 122
(-20 to 50)
5000
(464.5)
40 (12.2) Low2
Combustibles1
GENL-
100L
•
Specify
Gas
0-100% LEL
-40 to 122
(-40 to 50)
5000
(464.5)
40 (12.2)
Gas
Dependent
Acetaldehyde, Benzene, Carbon Disulfide, Dioxane, Ethane, Ethanol, Ethylbenzene, Gasoline, Heptane, Hexane, Ipa, Jet Fuel,
Kerosene, Naphtha, Styrene, Toluene, Voc’s, Xylenes, Acetylene, Diesel, Pentane, Ethyl Acetate, Propylene

Toxic/Combustible Gas Transmitter B6
Installation and Operation
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 5of 16
Installation
Enclosure Dimensions
Figure 2: Enclosure Dimensions
Location
The transmitter should be mounted where the gas to be measured is most likely to be present. This location will be
dependent on the source of the target gas and whether that gas is lighter or heavier than air. Air circulation and mixture
should also be taken into account.
CO gas is lighter than regular air, it can be mounted on the walls at least a couple of feet below the height of the ceiling. As
the transmitter has a digital read-out, placing it at about eye level is strong recommended.
The location should be accessible for the purposes of routine re-calibration and periodic sensor replacement. Sufficient
room should be left to allow the enclosure cover to be removed and the connection of the calibration adapter to the sensor
chamber. For sensor element replacement there will need to be enough room to remove enclosure cover and the sensor
board assembly.
NOTE The transmitter can also be installed in limited outdoor environment - An ambient air environment that is not climate
controlled and is not in direct contact with the elements of nature, such as wind, rain, sleet or snow. Examples of limited
outdoor environments include parking garages, construction complexes, sports venues, boats and recreational vehicles.
Tip
Avoid mounting the transmitter near 600 VAC switchgear and other sources of radio frequency and/or
electromagnetic interference. While RFI/EMI protection is built into the transmitter, excessive levels of
interference may cause instability in the output signal.

Toxic/Combustible Gas Transmitter B6
Installation and Operation
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 6of 16
Terminals
Figure 3: Terminals
Wire and Cable
Terminal blocks TB1 to TB7 accept 12 AWG to 24 AWG wire. Use 16 AWG or 18 AWG wire for the power supply in long
wiring runs, which can be up to 1km (1,000 meters) long.
We recommend using BELDEN 9841 for communications. This wire has 120 ohm input impendence, which will eliminate
RS-485 communication problems.
Power Requirements
The B6M power supply voltage requirements are nominally 24VAC or 24VDC.
The B6M has full wave rectifier and half wave rectifier on board. You will damage devices if you mix half wave and full
wave rectifiers on the same AC source. Use extreme caution when sharing a common AC source. Sharing a common DC
source is less problematic.

Toxic/Combustible Gas Transmitter B6
Installation and Operation
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 7of 16
RS-485 Terminator
The terminator on each end of the RS485 run is designed to match the electrical impedance characteristic of the twisted
pair wire, and will prevent signal echoes from corrupting the data on the line. The terminator should be enabled on BOTH
ends of the RS485 run. Short and medium length Modbus/485 runs can operate without the terminating resistor. Longer
runs may require the terminating resistors. But adding terminator dramatically increases power consumption.
Factory default setting is disabled terminator.
The B6 supplies this resistor on the main board, and it is chosen using a jumper at J4.
•4 1-2: Terminator Disabled / OFF (default)
•J4 2-3: Terminator Enabled / ON
RS-485 Driver Replacement
RS-485 lines in heavy industrial environments are sometimes subjected to magnetic disturbances causing sufficient
inducted power surges to damage the driver integrated circuit (IC). This IC (U6) has a socket on the circuit card for ease of
replacement in the field.
Relays Output
The B6 has three onboard programmable Single-Pole Double-Throw (SPDT) relays. These relays can be used to control
other equipment, such as fans, lights, horns, etc. eliminating the need for a separate controller.
Three terminal blocks (TB1, TB2 and TB3) are located on the main board. Each relay can be programmed individually.
Switching capability of each relay is:
•A maximum resistive load at 30 VDC
•0.3A maximum resistive load at 125VAC
Note for B6:
The B6 supports BACnet MS/TP protocol and can be networked to form a BACnet MS/TP network.
The B6 default baud rate is 38400bps.
Each B6 on the MS/TP network must have a unique BACnet MAC address and unique Device Instance Number (Object
ID).
•B6 valid MAC addresses are 0-127 for master node, 0-254 for slave node.
•B6 default MAC address is 126.
•Default Device Instance Number (Object ID) is 4005.
Caution
When the B6 input power is AC, make sure all devices on the network use same rectifier circuit. The
B6M and Q6R both have full wave rectifier and half wave rectifier on board. You will damage devices if
you mix half wave and full wave rectifiers on the same AC source.
Tip
Avoid running communication wires or sensor input wires next to AC power wires or the relay output
wires. These can be sources of noise that can affect signal quality.

Toxic/Combustible Gas Transmitter B6
Installation and Operation
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 8of 16
Function and Configuration
Indicators
The indicators consist of five LED’s – two to indicate RS-485 digital communication, three to indicate the status of relays 1-
3.
RS485-TX/RX:
When the B6 is connected to a controller system via RS-485, the traffic of the communication
can be monitored visually through the two RS-485 indicators. One is RX LED, which indicates
the data stream received in from the controller. The other is TX LED, which indicates the data
stream out of the B6.
Note: If the TX LED or the RX LED is always ON, is indicative of a communication problem.
See Troubleshooting for RS-485.
Relay 1-3 LED:
Indicate the status of each relay. When the relay is actuated/closed, the relay LED is ON. When the relay is de-
actuated/open, the relay LED is OFF.
Note: If you set the relay to be Normally Energized (Fail Safe), the relay LED will turn ON at non-alarm state and turn OFF
at alarm state, because the LED reflects the relay coil status.
Tool Function
Press key [F3] to enter tool functions that might be used
frequently in the field.
Enter Main Menu
Press key [F1] to browse previous item of the current
menu.
Press key [F2] to browse next item of the current menu.
Press key [F3] to enter the main menu for more
configuration and settings.
Hush Buzzer and Relay
Press key [F3] to silence the buzzer and buzzer-style
relays.
Reset Latched/Hushed
To acknowledge a latched condition or a hushed condition,
press key [F3] to reset latched relays and hushed buzzer
for which the alarm condition has been removed. If the
alarm condition (e.g. high gas concentration) is still
present the relay(s) will not reset.

Toxic/Combustible Gas Transmitter B6
Installation and Operation
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 9of 16
Reset MENU Password
If you forgot the main menu password, you can reset the menu password to default password “4321” by entering a correct
active code.
Exit Tool Mode
Press key [F3] to return to monitoring mode.
Menu “1_SYSTEM SETUP”
The system setup subdivision contains general settings for monitor operations, communications and 4-20mA calibrations.
Password:
Default password is 4321.
MAC
Address:
The B6 RS-485 address can be defined from 0 to 255. B6 default address is 126.
Object ID:
BACnet Device Instance Number. Default is 4005.
Baud rate:
Define baud rate for RS-485 communication with BACnet protocol. B6 default baud rate is 38400 bps.
Scroll Rate: In normal operation, the sensor and relay status information scrolls automatically. Set the number of
seconds for each item to be displayed. Default value is 3 seconds.
Backlight:
The LCD backlight can be set to Always Off, Always On and Auto Power Saving mode. In Auto Power
Saving mode, the backlight will turn on for 10 seconds after any key has been pressed. Default setting
is Auto.
UTC Offset
The B6 supports the execution of the TimeSynchronization service and UTCTimeSynchronization
service. It indicates the number of minutes ( - 780 to +780) offset between local standard time and
Universal Time Coordinated. Default is +300 (US & Canada Eastern Time).
Daylight Saving
It indicates whether daylight saving time is in effect (Enabled) or not (Disabled) at the B6 location
in UTCTimeSynchronization service.
Default is Enabled.
New Password: The new password can be any combination of up to four digits. Default password is 4321.
Warning: Be sure that you record the new password in a safe and secure location!
Protocol:
The B6 supports BACnet MS/TP master or slave protocol. Default is MS/TP master.
Display Mode:
Display Instant: displays instantaneous gas concentration
Display Average:
Displays STEL (15min average reading)
Displays TWA (8 hour average reading)
Displays daily peak
Display Alarm: displays alarm 1-8 status
Display Relay: displays relay 1-3 status
Display Buzzer: displays buzzer 1-3 status
Display A-Out mA: Not Available for B6
Display A-Out VDC: Not Available for B6
Display Clock: displays real time clock (Default is no clock display) If there is nothing to display, the unit
will display “Running…”

Toxic/Combustible Gas Transmitter B6
Installation and Operation
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 10 of 16
Auto Zero:
Settings for both B6M sensor and Q6R sensor
When AutoZero is set to ON, the unit will gather the lowest reading in 7- day period and set the unit into
Zeroing Calibration mode so that the lowest reading goes to zero. When AutoZero is set to OFF, the
unit will not adjust its own zero and work off the last manual or factory calibration.
Default value is OFF.
NOTE: AutoZero works best in situations where the building will purge at night (or over a weekend) to a
zero concentration of target gas.
Key Beeper:
ON: Beeping when keypad is touched OFF: No beeping when keypad is touched
Restore Default:
Note: Don’t do this if you don’t have calibration gas and precision reference instrumentation to
calibrate the unit.
To load defaults to factory settings, to restore the unit to correct operation. The settings below will be
restored to default values:
-Password, -Baud rate, -Scroll rate, -Backlight, -Display mode, -Key beeper,
-LCD contrast, -Gas type on the Sensor Board, -Alarm settings, - Relay/Buzzer settings.
Zero and span calibrations are needed.
ADJ Clock: Adjust real time clock. The B6 supports the execution of the TimeSynchronization service and
UTCTimeSynchronization service. The clock can be adjusted remotely.
ADJ
Contrast:
Adjust the LCD contrast. Valid values are between 10 (light) and 50 (dark). Default is 21.
B6 Sensors:
If the smart sensor in B6M unit is not installed, it can be disabled here, so the B6 will not detect the smart sensor
board and will not report any fault on the sensor offline
If the smart sensor in Q6R is not installed, it can be disabled too.
Both default values are ON, that means both B6M and Q6R sensors are installed.
Output Priority:
Alarm output (BV) present_value and relay output (BO) present_value support command prioritization. The B6 has
priority #12 as default.
The lower the priority umber the more critical the nature of the output. Priority #1 is considered the highest priority.
Priority #16 is the lowest priority.
Menu “2_ZERO CAL”
First to select which sensor is going to be calibrated, B6M or Q6R? The subsequent zero calibration will be performed on
that sensor.
The calibration is using a two-point calibration process. First, use a “Zero Gas”, then use a “CAL Gas” containing a known
concentration of a standard reference gas, to set the second point of reference.
Equipment Required
•A cylinder of Zero Gas, (clean air or nitrogen).
•A cylinder of Cal Gas
•Flow Limiting Regulator(s) 0.2 to 1.0 lpm
•Tubing

Toxic/Combustible Gas Transmitter B6
Installation and Operation
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 11 of 16
Zeroing Calibration Procedure
1. “2_ ZERO CAL:”
2. Press key [F3] and the device will show the calibration notice and then ask if you want to continue. The middle line
will display the current concentration.
3. Apply the Zero Gas.
4. Wait for about 3 minutes or until the reading is stable.
5. Press key [F3] to confirm Zeroing Cal.
6. When the device is in Zeroing CAL, it will take 3 seconds to 20 seconds to complete.
7. When the zeroing CAL operation is over, the device will display “Accepted” and return to “2_ZERO CAL”.
8. Make sure there is no Cal Error displayed. If Cal Error is reported, repeat the procedures above. If the Cal Error is
still showed up, the sensor may be expired.
9. Remove the gas.
10. Exit the menu to Monitoring Mode
Menu “3_SPAN CAL”
First select the sensor to be calibrated, B6 / Q6R. The subsequent span calibration will be performed on that sensor.
1. “3_ SPAN CAL”
2. Press key [F3] and the device will ask for the CAL GAS, input the concentration of the calibration gas.
3. Press key [F3] and the device will show the calibration notice and then show the flow rate for the span calibration.
Press any key to continue, and then the device will ask you if you want to continue. The middle line will display the
current concentration.
4. Apply the calibration gas.
5. Wait for about 3 minutes or until the reading is stable.
6. Press key [F3] to confirm SPAN CAL.
7. When the device is in span cal, it will take 10 seconds to 1 minute to complete.
8. When the span cal operation is over, the device will display “Accepted” and return to “3_SPAN CAL”.
9. Make sure there is no Cal Error displayed. If Cal Error is reported, repeat the procedures above. If the Cal Error is still
showed up, the sensor maybe expired.
10. Remove the gas.
11. Exit menu to Monitoring Mode.

Toxic/Combustible Gas Transmitter B6
Installation and Operation
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 12 of 16
Menu “4_OUT TEST”
During system installation and testing, it may be necessary to force relays and buzzers on and off.
The Relay Testing feature allows the user to force the actuation of each relay. This function forces an Actuate vs. De-
actuate action, not an energized vs. non-energized action. Therefore the user must be aware of these relays, which have
been defined as normally energized or not normally energized.
According to UL2075 standard for safety, the Q6 Endurance Test will automatically perform 6000 cycles of Relay/Buzzer
On and Off operation at a rate of not more than 15 cpm.
Note: The 4mA and 20mA outputs are not available for Q6.
Menu “5_VIEW SETTING”
This function is to verify the settings for the alarms, relays, buzzers and analog outputs. Note: The View of A-Out Setup is
not available for B6.

Toxic/Combustible Gas Transmitter B6
Installation and Operation
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 13 of 16
Menu “6_ALARM SETUP”
First to select which sensor’s alarm is going to be set, B6M or Q6R? The subsequent alarm settings will be performed on
that sensor. The B6M supports alarm 1 to alarm 8 on its sensor. The Q6R supports alarm 1 to alarm 8 on its sensor too.
Alarm is a programmable condition that can receive a selectable input and trigger relays and buzzers.
Disabled or
Enabled:
Each alarm may be individually set to be enabled or disabled. If the alarm is disabled, the
alarm will not be used to calculate or trigger anything.
Default: Alarm 1 to Alarm 4 is enabled. Alarm 5 to Alarm 8 is disabled.
Input:
One of five inputs is selected to calculate the alarm condition status to trigger the
selected outputs:
•INSTANT: instantaneous gas reading.
•15 MIN AVG (STEL): Short Term Exposure Limit, average reading over 15
minutes.
•8 HOURS AVG (TWA): 8-hour Time Weighted Average, average reading over 8
hours.
•DAILY PEAK: daily peak reading.
•FAULT: If the unit reports any faults, no matter the gas concentration, it will
trigger the selected outputs.

Toxic/Combustible Gas Transmitter B6
Installation and Operation
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 14 of 16
Alarm On
and Alarm
Off
Reading:
If Alarm On is greater than or equal to Alarm Off:
Alarm On: Sets the concentration at or above which the relay will actuate.
Alarm Off: Sets the concentration at or below which the relay will de- actuate.
If Action On is less than Action Off:
Action On: Sets the concentration below that the relay will actuate. Action Off: Sets the
concentration above that the relay will de-actuate.
Trigger:
Trigger Outputs: Relay 1, Relay 2, Relay 3, Buzzer 1, Buzzer 2, Buzzer 3
Menu “7_RELAY STYLE”
Enabled:
Each relay may be individually set to be enabled or disabled. If it’s disabled, the relay will
always de-actuate no matter what the current gas concentration.
Default is Enabled.
Normally De-
energized:
Each relay may be individually set to be normally energized or normally de-energized.
Default is normally de-energized.
Latching:
Each relay may be set to latch in actuate status until acknowledged by a front-panel action.
Default is Non-Latching.
ON Delay:
“Delay on Actuation” or “Delay on Make”. For each relay a separate time delay may be set
from 0 to 990 seconds before an alarm condition will cause the relay to actuate.
Default is 5 seconds.
OFF Delay:
“Delay on De-Actuation” or “Delay on Break”. For each relay a separate time delay may be
set from 0 to 990 seconds before a return to a non- alarming signal condition will cause the
relay to de-actuate.
Default is 5 seconds.
Style:
Normal Relay Style: Work as normal relay.
Buzzer Style Relay: When the relay is used to control a buzzer or horn. Working as a buzzer
style will make the relay have the same function as the buzzer. It will be switched off when
performing the Hush Buzzer/Relay function in the Tool Menu.
Default is OFF.
Menu “8_BUZZER STYLE”
The buzzer style is almost identical to that of the relays, except the style that represents the buzzer tone options:
•Tone 1: Chirp once.
•Tone 2: Chirp twice.
•Tone 3: Intermittent 50% duty cycle.
•Tone 4: Continuous.
The menus are identical to those for the Relay Style.
Menu “A_ALL DISABLE”
This function is for calibration, system testing etc. When All Disable is ON, the status of the relay, buzzer and analog
output, etc., will freeze in their current state.
Default is OFF.

Toxic/Combustible Gas Transmitter B6
Installation and Operation
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 15 of 16
Menu “B_SIMULATION”
First to select B6M or Q6R to be set into simulation mode
Simulation mode is used to assist in testing the installation before commissioning. When simulation is enabled, the unit will
not detect gas concentrations; it will display the simulated value and use it to calculate the status of relays and buzzers.
This feature is available for evaluating the user settings and testing the installation (e.g.: the activation of the valve, fan
speed, relay set points, etc. can be verified.)
Any concentration between 0ppm and 9999ppm can be simulated.
Menu “C_SITE SERVICE” and “D_FACTROY SET”
Factory service staff access only. The customer has no need to operate it.
BACnet PIC Statement Supported By B6
See document: 86650-103-000 (B6 PIC Statement).
Smart Sensor Assembly Replacement
Disassembling
Observe all safety and electrical codes and regulations before removing enclosure lid.
Tip
Calibrate the transmitter whenever a component is replaced. But if you replace a smart sensor
assembly with a sensor onboard, you don’t need to recalibrate the transmitter, as all the calibration
information has been stored in the smart sensor board in the factory process.
Replacement Procedure
To replace the entire smart sensor assembly, complete the following steps:

Toxic/Combustible Gas Transmitter B6
Installation and Operation
N2-B6 Series - 8/23/23
Specifications subject to change without notice.
Catalog No. 11-808-788-01 Page 16 of 16
Power down the transmitter.
1. Remove the four screws securing the enclosure lid assembly to the base enclosure and remove the enclosure lid
assembly.
2. Remove the two screws securing the smart sensor board and remove the smart sensor board from the lid assembly
3. Feed the O-ring over the sensor on the new smart sensor assembly
4. Plug the new smart sensor assembly and secure with two screws. Ensure that the connectors are correctly matched.
Incorrect installation may damage the sensor assembly and/or the display board.
Troubleshooting
This troubleshooting guide is intended as an aid in identifying the cause of unexpected behavior and determining whether
the behavior is due to normal operation or an internal or external problem.
SYMPTOMS
PROBABLE CAUSE
SUGGESTED SOLUTION
RS-485 RX LED or TX LED
constantly ON
•RS-485 bus connection has a problem
•RS-485 driver U6 is damaged
•Controller side RS-485 driver has
problem
•Disconnect the cable to isolate the
problem
•Replace U6 IC on main board
•Replace the RS-485 driver on the
controller
No response to gas
•Sensor screen is dirty
•Sensor has expired
•Clean sensor opening
•Replace smart sensor assembly, see
Replacement Parts
Apparent false alarm
•Puff of gas
•Not properly calibrated
•Solvent fumes or interference from
high levels of interfering gas
•Radio frequency interference
•Monitor is functioning
•Recalibrate
•Remove source of interfering gas
•Check that grounding and shielding is
correct
Appendix – Symbols Key
Warning Potential for death, serious injury, or permanent damage to a system.
Caution Potential for injury, damage to a system, or system failure.
Tip
Useful information not related to injury or system damage.