SENVA TG SERIES Toxic Gas Sensor BACnet Instruction Manual

: July 1, 2024
: SENVA

Table of Contents

TG SERIES Toxic Gas Sensor BACnet
Product Specifications
Product Usage Instructions
Installation
Streamlined Wall Installation
- FAQ
Q: How should I mount the sensor for different gas types?
Q: What should I do for conduit installations?

TG SERIES Toxic Gas Sensor BACnet

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Product Specifications

Output Type: Analog
Gas Type 1: Carbon Monoxide (CO)
Gas Type 2: None
Temperature Enclosure Lid: Metal

Product Usage Instructions

Installation

Identify the package type (wall/metal or duct) of the TG Series
sensor.
Wall Mount (TGM or TGW):
- Locate sensor near traffic areas, away from sources of
  ventilation or drafts.
- One sensor per 5000-7500 square feet is normally required for
  CO, NO2, CO2, Methane, Hydrogen, Oxygen, H2S, and Ammonia NH3.
- Propane and refrigerant sensors should be limited to 5000
  square feet or less.
- Recommended sensor mounting heights for specific gases.
Mount the sensor directly and securely to the wall with
appropriate fasteners.

Streamlined Wall Installation

Install mud plate in a 2×4 conduit junction box or mount TG
directly to the wall.
Plug the removed sensor board into the TG-REM board using the
provided red sensor connectors.
Run provided RJ45 cable between the two enclosures and plug
each end into the provided sensor boards.

FAQ

Q: How should I mount the sensor for different gas types?

A: Refer to the recommended sensor mounting
heights based on the type of gas being detected. Ensure compliance
with local and state building codes.

Q: What should I do for conduit installations?

A: Remove the circuit board from the enclosure
before drilling holes to prevent damage to the product.

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INSTALLATION INSTRUCTIONS

TG SERIES

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WARNING

Toxic Gas Sensor BACnet/Modbus/Analog
LIMITATION OF LIABILITY Senva’s liability, whether in contract, in tort, under any warranty, in negligence or otherwise shall not exceed the amount of the purchase price paid by the purchaser for the product. Under no circumstances shall Senva be liable for special or consequential damages.

· Use installation wires rated for 75oC and above.
· The TG Series (the equipment covered by the IFU) has not been tested for Life Safety Applications and are not to be used in Life Safety Applications in jurisdictions that require this certification.
· Only qualified trade installers should install, program, maintain and test system incorporated therein. Installer is responsible for compliance of all applicable codes.
· Read, understand, and follow instructions thoroughly.
· The unit and associated systems require routine test and maintenance as prescribed in the TG Series User’s Manual section `Periodic Test and Maintenance’
· Do not install in hazardous or classified locations.
· De-energize power supply prior to installation.
· Gas sensors should not be used as a substitute for proper installation, use, or maintenance of gas emitting equipment.
· This device is designed to detect conditions that could result in acute effects of gas exposure. It will not fully safeguard individuals with specific medical conditions. If in doubt, consult a medical practitioner.
· Conduit is prone to condensation if it passes from one temperature zone to another, such as from indoors to outdoors or from one part of a building to another. This condensation may actually drip into the sensor if mounted below, causing damage and/or poor readings.
In order to prevent condensation and water egress, seal both the top and bottom of the conduit with a suitable expanding foam product (such as PolywaterTM ZipsealTM ZIP-50KIT1) to prevent warm air from entering cold conduit.
Alternatively, fiberglass insulation may be inserted in the conduit between the cold and warm sections using a rigid wire or other method if both ends cannot be sealed. Sealing is the preferred method. · Conduit air flow entering sensor may prevent sensor from reading ambient air properly, resulting in under measurement of gases. Plug sensor conduit in all installations with a foam plug or seal as noted above in order to prevent airflow from the conduit.

TG –

–

Package

Output Type

Gas Type 1*

Gas Type 2*

Temperature Enclosure Lid

W = Wall Mount A = Analog

C = Carbon Monoxide (CO) X = No second gas

A = None

D = Duct Mount B = BACnet/Modbus N = Nitrogen Dioxide (NO2) N = Nitrogen Dioxide (NO2) C = 100Pt RTD

M = Metal

D = Carbon Dioxide (CO2) D = Carbon Dioxide (CO2) D = 1000Pt RTD

E = Dual Channel CO2

E = 10K Type 2

M = Methane (CH4)

F = 10K Type 3

P = Propane (C3H8)

G = 10k w/11k

*Refrigerant sensors may not be

H = Hydrogen (H2)

H = 3k

paired with CH4, C3H8, or H2, or

O = Oxygen (O2)

I = 2k2

paired together.

S = Hydrogen Sulphide (H2S) S = Hydrogen Sulphide (H2S) J = 1k8

A = Ammonia (NH3)

K = 20k

Blank = Clear/Tinted S = Solid/Opaque W=White/Solid

2 = R22

3 = R134A (Multi-Refrigerant)

4 = R410A

5 = R404A 6 = R407C 7 = R449A

TG – REM –

8 = R513A

Package

Cable Length

9 = 1233ZDE

W = Wall Mount M = Metal

5 = 5 feet 10 = 10 feet

15 = 15 feet

20 = 20 feet

senvainc.com 1-866-660-8864 1825 NW 167th Place Beaverton Oregon 97006

INSTALLATION
1. Identify the package type (wall/metal or duct) of the TG Series sensor. Follow the Wall Mount’ orDuct Mount’ installation instructions accordingly:
Wall Mount (TGM or TGW) Locate sensor near traffic areas, away from sources of ventilation or drafts. One sensor per 5000-7500 square feet is normally required (applies to CO, NO2, CO2, Methane, Hydrogen, Oxygen, H2S, and Ammonia NH3). Propane and refrigerant sensors should be limited to 5000 square feet or less.
Recommended CO, NO2, CO2, Oxygen, and H2S Sensor Mounting Height is 3-6 feet above finished floor. Methane, Hydrogen, and Ammonia NH3 sensors should be mounted within 1 foot of the ceiling. Propane sensors should be mounted 1-3 feet above the floor. Refrigerant sensors should be mounted 6 inches above floor. Check with local and state building codes to ensure sensor mounting height is in compliance.
Mount the sensor directly and securely to the wall with the fasteners best suited to your construction. Use the factory provided #8 x 3/4″ Pan self tapping screws or equivalent.
· There are two mounting tabs for securing/mounting the sensor. Mount/secure sensor to desired position on the wall with screws while being careful not to over-tighten.
· The sensor has a hole in the back for mounting into a wall or a junction box. If a top mounted conduit connection is desired, drill out either of the top knockouts and install appropriate conduit fitting/connector.
ATTENTION: For conduit installations, remove circuit board from enclosure prior to drilling holes to ensure product is not damaged.
STREAMLINED WALL INSTALLATION
Step 1: Install mud plate in a 2×4″ conduit junction box, or skip this step if mouting TG directly to wall

Remote Mount TGW-REM, TGM-REM For installations that require separate mounting heights, the TGx-REM kit provides an easy solution. The TGx-REM comes with a pre-cut length of RJ45 cable, a plug-and-play sensor extension board, and a secondary TGW or TGM box equipped with everything you need to simply move one sensor board to a separate location. For remote sensor, follow “wall mount” instructions to mount the enclosure at the height required. 1. From the primary TG (with LCD), remove the sensor board in the rightmost position and replace it with sensor extender board provided in the TG-REM kit.
2. Plug the removed sensor board into the TG-REM board using the provided red sensor connectors. 3. Run provided RJ45 cable between the two enclosures and plug each end into the provided sensor boards.

Step 2: Run wire(s) through TG center; mount TG

Step 3: Wire to removable terminal block, plug, and play

For calibration, use the LCD on the primary TG. Alternatively, you may plug the remote sensor back into the primary TG to calibrate locally.

INSTALLATION (Continued)

WIRING & CALLOUTS

Duct Mount (TGD) Drill a 3/4″ hole in duct. Install sensor using gasket and screws provided. The pickup tube will ensure adequate air flow regardless of air flow direction.
Mount unit to duct with supplied screws.
2. Review the wiring call-outs and wire sensor to needed Inputs and outputs for your application. See Page 4 for example wiring schematics.
3. For Bacnet/Modbus version, communication wires may be daisy chained and termination resistor may be utilized. Use of appropriate shielded twisted pair wire (14-26 AWG) is recommended, per protocol specifications. Total wiring runs should not exceed 4000 feet, with a maximum of 128 devices (DtBoeAupCsenen1etd2th0)ineog5rbB13ouu02nisltdtteihPenruevmElilcnuOineepLastbw ((Mieoaonnsordkrrdee-bcossoiiufss-nsttloo)ifnirrigneu)artasetirnimognilne, aidttamioisnayyrcebhseaisinntoe. rcseossnary the TG S5e1n0sorP.uTllhdoewbnelboiaws srehsoiswtosran enabled termination resistor.
EOL 120 Resistor
120 Bus terminaon resistor
4. For applications utilizing the fan relay, the diagram on the following page shows connections between one or multiple TG sensors wired to an exhaust fan coil using the fan set-point relay(s). This function can be performed by a single TG sensor or a sequence of multiple TG sensors wired in parallel.
Ensure that the fan relay set-points are uniform. The fan relays will activate if one or more of the sensors reach the set-point.
5. Connect power wires. Use of a Class 2 LPS power supply or greater is required. Dedicated isolation transformers or power supplies are recommended for each sensor that is installed as shown in the schematic. Apply 15-30VDC or 24VAC to the V+ and V- terminals with appropriate sized wires (14-24AWG). 6. Apply power. Sensor may require up to 2 minutes of warmup time prior to displaying valid gas measurements.
7. For Bacnet/Modbus version, connect the TG Sensor(s) to an active network. The Senva TG Series can be used on both BACnet and Modbus networks. The default settings on the sensor include auto-detection of protocol type, device address (BACnet only), serial format and baud rate. Each BACnet/ Modbus TG sensor ships with a default Modbus address. This process is further detailed in the respective TG BACnet Protocol Guide or TG Modbus Protocol Guide. To manually adjust these parameters, utilize the TG Series User’s Guide.

9

1
8 5

2

11

3

9

6 10 7
4

BACNet/Modbus Version
POWER(+) COMMON( ) RS485(+) Agnd ( ) RS485(-) FAN IN(F ) FAN OUT(F ) ALARM IN(A ) ALARM OUT(A )

1 – LCD Display 2 – Buzzer 3 – Sensor Element 1 4 – Sensor Element 2 5 – Enclosure Hole for Wiring 6 – Terminal Block for Power and Control Wiring 7 – Fan and Alarm Relays 8 – Up/Down/Select Push Buttons 9 – Enclosure Mounting Holes 10 – EOL termination resistor 11- Terminal Block for Thermistor Wiring

6 10 7
4

Analog Version
POWER(+) COMMON( ) Analog out 1 (O1) Analog out 2 (O2) Not used (NC) FAN IN(F ) FAN OUT(F ) ALARM IN(A ) ALARM OUT(A )

Relay and BACnet Wiring
Transformer 1

TX(+)
Building Automation Control Comms (BACnet or Modbus)
RX(-)
Note: Colors are shown to clarify node connections; wire color shall be determined by national and local electrical codes.

24VAC

L

24VAC/10-30VDC N

WIRING EXAMPLES

Transformer 2

Gas Sensor 1 +

24VAC

Gas Sensor 2 +

(+)

For fan loads greater than 1A or 30V,

use Senva PR Relay

(-)

F

A

From FR2

Power

A

WHT/BLU

ORANGE

To Neutral
WHT/YEL

N
Load YELLOW

Exhaust Fan Coil R1 R2 Alarm Relay Coil

Analog Wiring for 0-5/10V circuits

Transformer 1 24VAC

Common Analog in 1 Analog in 2
DDC or Variable Frequency Drive

Transformer 2

Gas Sensor 1 +
O1 O2 NC

24VAC

Gas Sensor 2 +
O1 O2 NC

To controller thermistor input

Thermistor Out
Location shown in `wiring callouts’ diagram 11

TESTING MENU
To ensure device wiring a testing menu is available.
Access this menu by pressing the and buttons simultaneously for one second. The settings
menu is organized into several categories.
ItRu – Allows the user to set the testing interval
OUT – Allows the user to force the output signal to its highest value.
FAN – Allows the user to turn on the Fan relay for the length of the testing interval.
ALR – Allows the user to turn on the Alarm relay for the length of the testing interval.
bUZ – Allows the user to turn on the Piezo Buzzer for the length of the testing interval.

For more detailed instructions us this QR code to access our TG Series Users Guide.

OPERATION
The following section details factory defaults for LCD function, LED function, fan and alarm set-points, fan relay and alarm status functions, and the sensor element lifetime clock. These values can be modified from their default settings via the TG Series User’s Guide.

LCD Function
The LCD is factory defaulted to toggle between readouts for each gas type populated on the board. Toggling can be modified using the TG Series User’s Guide.

LED Function
The LED indicators function in sync with the fan relay and alarm status thresholds. LEDs will change state if either of the gases reach their fan or alarm set-point. Green Normal readings below the fan set-point

Yellow Gas concentration above the fan set-point and below the alarm set-point

Red

Gas concentration level above the alarm set-point

Fan and Alarm Set-points
The fan and alarm set-points are only applicable for elements populated on the board by the factory, or added in the field by the user.

Sensor CO NO2 CO2 Methane/ Propane/ Hydrogen Oxygen H2S Ammonia Refrigerants

Fan Relay (Default) 25 ppm 1 ppm 800 ppm 10% L.E.L.

Alarm (Default) 100 ppm 3 ppm 5000 ppm 25% L.E.L.

Less than 19.5% Vol 25 ppm 20 ppm 300 ppm

Greater than 23% Vol 75 ppm 40 ppm 600 ppm

Fan Relay/Alarm Status
Both the fan relay and alarm status are tied to the function of the LED indicators on each TG Series sensor. If a device has two elements populated on the board, then the fan relay and alarm status functions will activate if either of the gases reach their fan or alarm set-point.

Status

LED Fan Alarm Audible Relay Relay Alarm

Off

– Closed Closed Silent

Below Fan Set-point Green Open* Open Silent

Above Fan Set-point Yellow Closed* Open Silent

Above Alarm Setpoint

Red Closed Closed Silent

Above Alarm Setpoint for 30 minutes Red Closed Closed On* (or user defined delay)
For Oxygen, if reading is below fan setpoint, fan relay will close and red LED will be lit. Above the fan setpoint, the fan relay will open and green LED will be lit. **If Oxygen reading is below Fan setpoint for 30 minutes, audible alarm will activate.

Self-Test Feature
If “pulse check” is activated in S1/S2 or via communications, unit will periodically check the health of installed sensor elements. If either installed sensor fails the check or the 7 year lifetime of the sensor is exceeded, buzzer will chirp every 60 seconds and a red LED will blink to indicate the sensor needs to be replaced.
The duration of the fan relay and alarm buzzer operation are as follows. These values can also be modified from their default settings via the TG Series User’s Guide.

Relay Activation Timing

Fan Relay Minimum ON time Minimum OFF time Maximum OFF time

Value 60 seconds 60 seconds 0 (inactive)

Audible Alarm Activation Timing

Buzzer Delay

Value 30 minutes

Minimum ON time Minimum OFF time

0 seconds 0 seconds

Sensor Element Lifetime Clock
With 30 days remaining on the element life-cycle, the green LED will blink once every 10 seconds and the audible alarm will chirp once every 60 seconds. This timer can be viewed using the TG Series User’s Guide. Contact factory for replacement elements or see TG Series Calibration Guide to field calibrate the sensor.
PERIODIC TEST AND MAINTENANCE
Periodic Maintenance
Though the frequency of inspection is typically affected by the operating conditions and environment (extreme temperatures, extreme humidity, exposure to contaminants, etc.), Senva recommends the following maintenance and intervals. More frequent maintenance may be required per local code by the Jurisdiction Having Authority (JHA). An accurate log of all maintenance and abnormal occurrences should be maintained for the proper service of this product
Every 6 Months
· For Methane, Propane, Hydrogen, H2S, Ammonia NH3 or refrigerants retest and recalibrate the unit using NIST traceable reference gas to ensure sensors remain accurate.
· Visually inspect to ensure optimal operating conditions (no broken pieces/components, sensor filter not blocked or discolored, visual indicators operational, etc.).
· Clean the exterior with a soft cloth to remove debris from the sensor intake ports.
Annual
· For Oxygen, CO or NO2, retest and recalibrate the unit using NIST traceable reference gas to ensure sensors remain accurate.
· For sensor replacement be sure to power down the sensor and remove element to be replaced and plug in new element in its place and then re-apply power.
Do Not · Expose the sensor to high pressure water spray. · Expose the sensor and its elements to solvents. · Immerse the sensor into liquids.

Power supply Wiring
Outputs (Analog)
Output (BACnet/Modbus) Fan Relay Alarm Relay Display LED’s Audible exposure alarm
CO Sensor Performance(2)
NO2 Sensor Performance(3)

SPECIFICATIONS (Part 1/3)
Power 15-30VDC/24VAC (1), 50/60Hz, 4w max, 160mA max. Conductor 14-24 AWG, Minimum 600V, 75°C Terminal Torque 0.5 N·m 2 Programmable Outputs 0-10V (default), 0-5V, 1-5V, 4-20mA (menu selectable) CO Output Scaling 0-200ppm (default), 0-1000ppm (menu selectable) NO2 Output Scaling 0-10ppm (default), 0-30ppm (menu selectable) CO2 Output Scaling 0-10,000 ppm (default), 0-10,000 ppm (menu selectable) Propane/Methane/Hydrogen Output Scaling 0-50% LEL (default), 0-50% LEL (menu selectable) Oxygen Output Scaling 0-25% Vol (default), 0-25% Vol (menu selectable) Refrigerant Output Scaling 0-1000 ppm (default), 0-1000 ppm (menu selectable) H2S Output Scaling 0-100 ppm (default), 0-100 ppm (menu selectable) Ammonia NH3 Output Scaling 0-100 ppm (default), 0-100 ppm (menu selectable) Temp Output Scaling (optional) -20 to 85ºC
RS-485 BACnet MS/TP, Modbus RTU, Modbus ASCII Baud Rates 9600, 19200, 38400, 57600, 76800, 115200 RS-485 Loading 1/4 unit Fan relay characteristics N.C. 1A@24VAC/30VDC(50/60Hz)(No Mains Connection) Alarm relay characteristics N.C. 1A@24VAC/30VDC(50/60Hz)(No Mains Connection) 3-1/2 digit LCD Indicates CO ppm, NO2 ppm, Temp (menu selectable) Green, Yellow, Red Green = Normal, Yellow = Relay, Red = Alarm 85dB @4″ Piezo transducer 30 minutes above alarm set-point per UL2075 (menu selectable)
Type Electrochemical Accuracy ±5% of Default Range, ± 5% of Reading Above 200ppm Resolution 1ppm Certifications UL2075 Recognized component Life expectancy 7 years Recommended Calibration Annual Recommended Height(4) 3 to 6 feet; coverage 5000-7500 sq ft.
Type Electrochemical Accuracy ±5% of Default Range, ± 5% of Reading Above 20ppm Resolution 0.1ppm Certifications UL2075 Recognized component Life expectancy 7years Recommended Calibration Annual Recommended Height 3 to 6 feet; coverage 5000-7500 sq ft.

(1) One side of transformer secondary is connected to signal common. Dedicated transformer is recommended. No mains circuit connection allowed. In addition, it is required to use an isolated power supply that is certified by a national or international standard (i.e. UL). Use of a Class 2 LPS power supply or greater is required. (2) Carbon Monoxide full scale is 1000 ppm. (3) Nitrogen Dioxide full scale is 30 ppm.

CO2 Sensor Performance
Methane/Propane/ Hydrogen Sensor Performance
Oxygen Sensor Performance
Hydrogen Sulfide (H2S) Sensor Performance
Ammonia (NH3) Sensor Performance

SPECIFICATIONS (Part 2/3)

Type Non-dispersive Infrared (NDIR)

Accuracy (4)

±(30ppm +3% of reading) (400-2000ppm), @-10-50°C ±(50ppm +5% of reading) Standard (2000-5000ppm), @-10-50°C ±(50ppm+3% of reading) Dual Channel (2000-5000ppm), @-10-50°C ±(100ppm+10% of reading) (5000-10000ppm), @ 0-50C

Drift with ABC disabled(5) 35ppm/month (6) (Standard) 5ppm/month (6) (Dual Channel)

Range 0-2000/5000ppm; Programmable up to 10,000ppm

Resolution 1 ppm

Life expectancy 15 years

Response time 30s

Sample rate 1s

Recommended Height 3 to 6 feet; coverage 5000-7500 sq ft.

Type Catalytic

Detection Range 0-50% LEL (Lower Explosive Limit)

Accuracy ±5% of Range

Resolution 1% LEL

Certifications UL2075 Recognized component for Methane/Propane

Life expectancy >5 years

Response Time <10s to 90%

Recommended Calibration 6 months

Recommended Height(6) Hydrogen/Methane: 0.5 to 1 foot from ceiling; coverage 5000-7500

Type Electrochemical

Detection Range 0-25% Volume

Accuracy ±5% of Range

Resolution 0.1%

Life expectancy 5 years

Recommended Calibration Annual

Recommended Height 3 to 6 feet; coverage 5000-7500 sq ft.

Type Electrochemical

Detection Range 0-100 ppm

Accuracy ±5% of Range

Resolution 1 ppm

Life expectancy 5 years

Recommended Calibration 6 months

Recommended Height 3 to 6 feet; coverage 5000-7500 sq ft.

Type Electrochemical

Detection Range 0-100 ppm

Accuracy ±5% of Range

Resolution 0.1 ppm

Life expectancy 5 years

Recommended Calibration 6 months

Recommended Height 0.5 to 1 foot from ceiling; coverage 5000-7500 sq ft.

(4) CO2 sensor is equipped with a heater to account for temperatures down to -40°C (5) It is not recommended to de-activate ABC (auto-calibration) except for continuously occupied spaces or greenhouses. Drift ratings may vary based on environment. (6) Combination CO/Methane, CO/Propane, or CO/Refrigerant sensors should be mounted according to Propane/Methane/Refrigerant recommendations. Consult factory for other combinations. Mounting height recommendations may be adjusted according to installation. Ensure sensor is accessible for maintenance and target gas has unobstructed access to sensor. Mount in accordance with ANSI/NFPA 70 and NEC or CEC.

Refrigerant Sensors Performance
Operating Environment Enclosure (Wall & Duct)
Enclosure (Metal) Agency

SPECIFICATIONS (Part 3/3)
Type MOS
Detection Range 0-1000 ppm
Resolution 1 ppm
R22, R134A, R410A, R404A, R407C Calibrated for respective gas
R134A Sensitivity(7) @300ppm test gas: 450 ppm R410A, 425 ppm R407C, 400 ppm R404A, 370 ppm R22, 300 ppm R134A
Other Detectable Gases(8) R407A, R407F, R427A, R452B, R507, R448A, R454B, R455A, R455C, R422A, R422D, R452A, R514A, R32, Consult factory for other A2L gases
Life expectancy 10 years (typical expectation for MOS sensors)
Recommended Calibration 6 months Recommended Height 6 inches above floor; no more than 18 inches above lowest level of equipment location for leak detection; coverage 5000-7500 sq ft.
Temperature, continuous -20 to 50oC (MOS rated down to -30ºC; CO2 rated down to -40oC) Humidity 15-90% continuous, 0-99% intermittent
Max Elevation 2000m Material ABS/Polycarbonate
Dimensions 4.0″h x 4.4″w x 2.1″d Conduit Opening Tapped 1/2″ NPT
Rating IP43 or NEMA 3R Material & Enclosure Rating Powder-coated steel/acrylic
Dimensions 5.0″h x 4.3″w x 2.25″d Opening Dual air vents on bottom of enclosure
Mounting Pre-drilled for 2×4″ electrical box Rating IP41 or NEMA 3R
Compliance UL61010-1 Listed UL, cUL, CE, UL2075 Recognized CO/NO2/Propane/ Methane sensors

(7) R134A sensor may be used as a general purpose refrigerant detection. The sensor’s response to other refrigerants will change proportionally as shown in the following app note: https://www.senvainc.com/catalog/documents/downloadcenter/Refrigerant%20cross%20sensitivities.pdf (or scan QR code). Actual response may vary depending on installation. For more accurate response to a specific gas, a unit may be field calibrated. (8) These gases my be detected by the sensor but sensitivity curves are not available at this time.

Symptom No output Sensor reading error Relay Function LCD readout error Chirping Noise

TROUBLESHOOTING
Solution Check wiring. Ensure power supply meets requirements. Sensor contaminated or at end of life. Replace sensor. Verify set-point. Verify test gas concentration. Cover sensor to prevent drafts and dilution during test. See TG Series User’s Guide for full list of LCD diagnostic code definitions. Reliability feature has detected a faulty or missing sensor. Replace sensor element.

5.4 137 4.7 119 4.0 101

BACnet/Modbus Quick Reference
The following section outlines some commonly utilized Modbus registers and BACnet objects for quick reference. For a complete list and description of each, please see the associated protocol guides: TG BACnet Protocol Guide or TG Modbus Protocol Guide.

Access Legend: R=Readable W-Write-able W0 = Write-able with 0 only NV = Saved in non-volatile configuration memory

Description
Temperature Gas 1 Concentration Gas 2 Concentration

BACnet Object AI310 AI320 AI330

Modbus Register R310/11 R320/21 R330/31

Access
R/W0 R/W0 R/W0

Gas 1 Warning Set-point Gas 1 Alarm Set-point Gas 2 Warning Set-point Gas 2 Alarm Set-point

AV150 AV152 AV160 AV162

R150 R152 R160 R162

R/W/NV R/W/NV R/W/NV R/W/NV

Sensor 1 Self-Test Mode Sensor 2 Self-Test Mode Description
Fan Relay Fan Relay Override Alarm Relay Alarm Buzzer Alarm Buzzer Override

BV196

R196