C3-NET sensor

State-of-the-art gas sensor in several tailored to the customers versions, , with integrated electronics.

The C3-NET sensor is the most modern solution for operation in open and closed spaces, with three digital outputs, 4-20 mA and Modbus, enclosed in a polyamide housing.

An electrochemical, infrared or pellistor sensors can be connected to the integrated electronics in the housing. C3-NET is built into a polyamide housing, available as a standard version or with an additional dust filter.

The selected sensor is mounted in a special protective capsule, keeping it in the right position, guaranteeing the highest efficiency of its operation.

The versatility of the housing and the selection of protective capsules gives the possibility of assembly in C3-NET of standard catalytic, electrochemical and semiconductor oxygen and toxic gas sensors. The two-piece C3-NET enclosure enables easy sensor replacement. The lower part of the housing has an M42X1.5 thread for easy mounting of accessories or sensor assembly. The upper part contains M25x1.5 thread for mounting the sensor.

Protection against dust or increasing the IP is available on request in the form of an additional adapter mounted on the thread.

* Two versions:
- OPEN, for direct intelligent connection of the sensor with control and management systems
- CLOSE, with a mounting console
* Two TTL digital outputs with configurable alarm thresholds (potential free relays in CLOSE version 0,5A 230VAC)
* 4-20 mA output for connection to analogue systems
* RS485 (Modbus) for working in digital systems and for calibration
* Error signal (CLOSE version)
* Compatible with IR, EC and pellistor sensors
* The system is delivered in a set with a configured and calibrated sensor. A non-standard version is available on request. Simple on-site calibration.
* System management software
* A stainless steel housing is also available for use in high risk or temperature conditions
* 9-30 VDC power.


Funkcjonalność CLOSE CLOSE with WiFi/Bluetooth OPEN OPEN M12 Modbus RTU OPEN M12 CAN Open
power 18-30 VDC 18-30 VDC 10-30 VDC 10-30 VDC 10-30 VDC
4-20mA output Yes Yes Yes Yes No
relay output 2 2 x x x
TTL output, 0/1 10mA x x 2 x x
Modbus RTU output Yes Yes Yes Yes No
CANOPEN output No No No No Yes

Standard performance
The current list of sensors is available in technical materials and on the request.

Gas Type Type of sensor Range
Hydrocarbons HC Pellistor 0-100% LEL
Ammonia NH3 Pellistor 0-100% LEL
Hydrogen H2 Pellistor 0-100% LEL
Methane CH4 NDIR 0-100% LEL (4,4%Vol)
Methane CH4 NDIR 0-100% LEL (5,0%Vol)
Propane C3H8 NDIR 0-100% LEL (1,7%Vol)
Propane C3H8 NDIR 0-100% LEL (2,1%Vol)
Carbon Dioxide CO2 NDIR 0-5000 ppm
Carbon Dioxide CO2 NDIR 0-5% vol
Sulfur Hexafluoride SF6 NDIR 0-1000ppm/2000ppm
R-134a and other refrigerants
R134a NDIR 0-1000ppm/2000ppm
Carbon Monoxide CO Electrochemical 0-300 ppm
Hydrogen Sulfide H2S   Electrochemical 0-100 ppm
Amonia NH3   Electrochemical 0-100 ppm/300ppm
Amonia NH3   Electrochemical 0-1000 ppm/5000ppm
Nitrogen Dioxide NO2   Electrochemical 0-30 ppm
Nitrogen Oxide NO   Electrochemical 0-300 ppm
Chlorine CL2   Electrochemical 0-10 ppm
Sulfur Dioxide SO2   Electrochemical 0-20 ppm
Oxygen O2   Electrochemical 0-25% vol


Gas sensors dedicated to service of refrigeration and air conditioning systems - list of supported gases.

The list is subject to constant changes. Ask for gas that is not on the list.

Gas Description CAS no, formula
R11 R-11 Trichlorofluoromethane 75-69-4
R21 R-21 Dichlorofluoromethane 75-43-4
R32 R-32 Difluoromethane 75-10-5
R113 R-113 1,1,2-Trichloro-1,2,2-trifluoroethane 76-13-1
R22 R-22 Chlorodifluoromethane 75-45-6
H1211 R-1211 Bromo(chloro)difluoromethane 353-59-3
R500 R-500 Dichlorodifluoromethane Dichlorodifluoromethane (CFC-12)75-71-8 73.8%, 1,1 Difluoroethane (HFC-152a)75-37-6 26.2%
R409a R-409a Chlorodifluoromethane, Chlorodifluoromethane, Chlorotetrafluoroethane Chlorodifluoromethane (HCFC-22)75-45-6 60%, Chlorodifluoroethane (HCFC-142b)75-68-3 15%, Chlorotetrafluoroethane (HCFC-124)2837-89-0 25%
R401a R-104a Chlorodifluoromethane, Difluoromethane, Chlorotetrafluoroethane Chlorodifluoromethane (HCFC-22)75-45-6 53%, Difluoroethane (HFC-152a)75-37-6 13%, Chlorotetrafluoroethane (HCFC-124)2837-89-0 34%
R12 R-12 Dichlorodifluoromethane 75-71-8
R452b R-452b Opteon™XL55 (R-452B) Difluoromethane 75-10-5 67%, 2,3,3,3-Tetrafluoropropene 754-12-1 26%, Pentafluoroethane 354-33-6 7%
R134a R-134a 1,1,1,2-Tetrafluoroetan C 2H 2F 4 811-97-2
R407c R-407c Difluoromethane, Pentafluoroethane, 1,1,1,2-Tetrafluoroetha Difluoromethane (HFC-32)75-10-5 23%, Pentafluoroethane (HFC-125)354-33-6 25%, 1,1,1,2-Tetrafluoroethane (HFC-134a)811-97-2 52%
R407F R-407f Difluoromethane, Pentafluoroethane, 1,1,1,2-Tetrafluoroetha Difluoromethane (HFC-32)75-10-5 30%, Pentafluoroethane (HFC-125)354-33-6 30%, 1,1,1,2-Tetrafluoroethane (HFC-134a)811-97-2 40%
R123 R-123 1,1-Di-chloro-2,2,2-trifluoroethane 306-83-2
R410a R-410a Difluoromethane, Pentafluoroethane Difluoromethane 75-10-5 50%, Pentafluoroethane 354-33-6 50%
R408a R-408a Chlorodifluoromethane, 1,1,1-Trifluoroethane, Pentafluoroethane Chlorodifluoromethane (HCFC-22)75-45-6 47%, 1,1,1-Trifluoroethane (HFC-143a)420-46-2 46%, Pentafluoroethane (HFC-125)354-33-6 7%
H1233ZD R-1233zd Trans-1-chloro-3,3,3-trifluoropropene 102687-65-0
R426a R-426a mixture R134a 811-97-2 93%, R125 354-33-6 5,1%, R600 106-97-8 1,3%, R601a 78-78-4 0.6%
R427a R-427a FLUOROCARBON, mixture R134a 811-97-2 50%, R125 354-33-6 25%, R32 75-10-5 15%, R143a 420-46-2 10%
R407a R-407a Difluoromethane, Pentafluoroethane, 1,1,1,2-Tetrafluoroethane Difluoromethane (HFC-32)75-10-5 20%, Pentafluoroethane (HFC-125)354-33-6 40%, 1,1,1,2-Tetrafluoroethane (HFC-134a)811-97-2 40%
R402b R-402b Chlorodifluoromethane, Pentafluoroethane, Propane Chlorodifluoromethane (HCFC-22)75-45-6 60%, Pentafluoroethane (HFC-125)354-33-6 38%, Propane (R-290)74-98-6 2%
R449a R-449a Opteon® XP40 CAS-No.811-97-2 25,7%, CAS-No.754-12-1 25,3%, CAS-No.354-33-6 24,7%, CAS-No.75-10-5 24,3%
R502 R-502 Chlorodifluoromethane, Chloropentafluoroethane Chlorodifluoromethane (HCFC-22)75-45-6 48.8%, Chloropentafluoroethane (CFC-115)76-15-3 51.2%
R448a R-448a Honeywell Solstice® N40 Refrigerant (R-448A) Difluoromethane 75-10-5 26.00%, Pentafluoroethane 354-33-6 26.00%, 1,1,1,2-Tetrafluoroethane811-97-2 21.00%, 2,3,3,3-Tetrafluoroprop-1-ene754-12-120.00%, trans-1,3,3,3-Tetrafluoroprop-1-ene 29118-24-9 7.00%
R236FA R-236fa 1,1,1,3,3,3-Hexafluoropropane 690-39-1
R438a R-438a ISCEON®MO99 (R438A) Difluoromethane (R-32) 75-10-5 8.5%, Pentafluoroethane (R-125) 354-33-6 45.0%, 1,1,1,2-Tetrafluoroethane (R-134a) 811-97-2 44.2%, n-Butane 106-97-8 1.7%, Isopentane 78-78-4 0.6%
R402a R-402a Chlorodifluoromethane, Pentafluoroethane, Propane Chlorodifluoromethane (HCFC-22)75-45-6 38%, Pentafluoroethane (HFC-125)354-33-6 60%, Propane (R-290)74-98-6 2%
R114 R-114 Dichlorotetrafluoroethane 76-14-2
R513a R-513a Opteon™XP10 (R-513A) Refrigerant 2,3,3,3-Tetrafluoropropene754-12-1 56%, 1,1,1,2-Tetrafluoroethane811-97-2 44%
R124 R-124 Chlorotetrafluoroethane 2837-89-0
H2402 R-2402 dibromotetrafluoroetan Halon 2402 124-73-2
R452a R452a OpteonTM XP44 (R452A) Tetrafluoroprop-1-ene (HFO1234yf) C3H2F4754-12-1 30%, Difluoromethane (R32) CH2F2 75-10-5 11%, Pentafluoroethane (R125) CHF2CF3 354-33-6 59%
R404a R-404a Pentafluoroethane, 1,1,1-Tetrafluoroethane, 1,1,1,2-Tetrafluoroethane Pentafluoroethane (HFC-125)354-33-6 44%, 1,1,1-Trifluoroethane (HFC-143a)420-46-2 52%, 1,1,1,2-Tetrafluoroethane (HFC-134a)811-97-2 4%
R514a R-514a Opteon™XP30 (R-514A) Refrigerant (Z)-1,1,1,4,4,4-Hexafluoro-2-butene*692-49-9 74.7%, trans-Dichloroethylene156-60-5 25.3%
HFP 1,1,1,3,3,3-Hexafluoro-2-propanol 920-66-1
R422d R-422d Pentafluoroethane, 1,1,1,2-Tetrafluoroethane, Isobutane Pentafluoroethane (HFC-125)354-33-6 65.1%, 1,1,1,2-Tetrafluoroethane (HFC-134a)811-97-2 31.5%, Isobutane (R-600a)75-28-5 3.4%
R507 R507 Pentafluoroethane, 1,1,1-Trifluoroethane Pentafluoroethane 354-33-6 50%, 1,1,1-Trifluoroethane420-46-2 50%%
R424a R-424a mixture R134a 811-97-2 47%, R125 354-33-6 50,5%, R600 106-97-8 1,0%, R600a 75-28-5 0,9%, R601a 78-78-4 0,6%
H1234ZE R-1234ze Trans-1,3,3,3-Tetrafluoroprop-1-ene 29118-24-9
R245FA R-245fa 1,1,1,3,3-Pentafluoropropane 460-73-1
R503 R-503 Pentafluoroethane, Trifluoromethane R13 75-72-960 60%, R23 75-46-7 40%
R508b R-508b Trifluoromethane, Hexafluoroethane Trifluoromethane 75-46-7 30-50%, Hexafluoroethane 76-16-4 50-70%
R422a R-422a Pentafluoroethane, 1,1,1,2-Tetrafluoroethane, Isobutane Pentafluoroethane354-33-6 85.1%, 1,1,1,2-Tetrafluoroethane811-97-2 11.5%, Isobutane75-28-5 3.4%
H1301 R-1301 Bromotrifluoromethane 75-63-8
R125 R-125 Pentafluoroethane 354-33-6
H1234YF R-1234yf 2,3,3,3-Tetrafluoropropen 754-12-1
H1336mzzE R-1336mzzE, HFO-1336mzz-Z , DR-2 692-49-9
R227 R-227 1,1,1,2,3,3,3-Heptafluoropropane 431-89-0
R236FA R-236fa 1,1,1,3,3,3-Hexafluoropropane 690-39-1
R1336mzz(Z) R-1336mzzZ 1,1,1,4,4,4-Hexafluor-2-buten 692-49-9
FC72 FC-72 3M™Fluorinert™Electronic Liquid 86508-42-1
FA188 FA-188 84650-68-0



Tomorrow's technology
NDIR technology (non-dispersive infrared), the most modern of infrared technology combined with dedicated management electronics, enables unprecedented quality, stability and repeatability of detection.
The advantage of the offered NDIR sensors is the practical no zero drift.

The higher purchase price, over a minimum of 5 years, is compensated with interest by avoiding expensive ones periodic sensor calibration.


C3-NET Datasheet
C3-NET Manual
C3-NET Current list of sensors
C3-NET Close Version Dimensions
C3-NET Close Version 3m Dimensions
C3-NET Open Version M12 Dimensions
C3-NET Open Version Dimensions
C3-NET Declaration of Conformity



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