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Midas Gas Detector from Honeywell

Choose the Midas Gas Detector to detect more than 35 gases – easily, quickly and error free. All with extended sensor calibration periods, patented diagnostics and lower cost of ownership.

For best pricing, please call 1-800-952-3293 or email



Choose the Midas Gas Detector to detect more than 35 gases – easily, quickly and error free. All with extended sensor calibration periods, patented diagnostics and lower cost of ownership. The Midas Gas Detector uses reliable sensor technology to detect many key toxic, ambient and flammable gases in a plant. Thee device monitors points up to 100 fee away while using patented technology to regulate flow rates and ensure error free gas detection. Thanks to Honeywell’s use of advanced robotics, the Midas Gas Detector offers unbeatable quality and reliability.

The Midas is equipped with bright LED lights and an intuitive, interactive interface that provides instant alerts to gas reading or alarm levels. The interface also includes password protected menus for configuration, test and calibration. With it’s compact size and easy to handle metal chassis, installation is very easy. The Midas Gas Detector is complemented by Honeywell’s innovative ChemCassette technology, which detects ultrasensitive toxic gases at low parts per billion (ppb) levels. Honeywell offers 24/7 support of a worldwide network of service engineers. With feature-rich capabilities that are easy to use, the Midas Gas Detector is suitable for many industry applications, including semiconductor processing, light industrial manufacturing, university laboratories, aerospace, wastewater and more.

With flexible features and options, the Midas works right out of the box and configures easily to meet your needs. Each plug and play sensor cartridge is pre-calibrated, so it’s ready when you are. That means longer sensor life, quick and easy  replacement and no operator error due to incorrect or depleted sensors.

The standard power supply and communications capabilities include three onboard relays, 0-22 mA analog output and Modbus/TCP Ethernet digital outputs. Plus, the Midas includes the innovative Power over Ethernet (PoE) protocol – a single Ethernet connection for all power, control and communication requirements. Thanks to the Midas architecture, cost-effective integration with PLC and Fieldbus systems is greatly simplified.

Offered as an option, the Midas Pyrolyzer allows for the detection of NF3 and other CxFy gases. Cost of ownership is low, as the Pyrolyzer has a replaceable heater assembly with a lifespan of greater than two years. Even more, thanks to the proprietary catalyst to improve efficiency in gas conversion, the Pyrolyzer delivers automatic flow control, temperature control and fast and accurate performance. Additionally, the Pyrolyzer can run from a Midas Gas Detector that’s powered by either PoE or 24 VDC.


  • Over 35 gases available with extended 2 year warranty*
  • Smart sensor cartridge with on board “e-calibration’ certificate
  • 3 built in relays (Form C) for Alarm 1, 2 and Fault
  • Power over Ethernet (PoE) communication
  • Keypad interface and remote web browser interface
  • Optional Midas Pyrolyzer module that connect to any Midas gas detector
  • Password protected menu levels to preserve system integrity
  • Bright LEDs and intuitive icon driven, large multicolor backlit LCD display
  • Factory-calibrated sensors to reduce the need for frequent gas testing
  • Isolated 0-22 mA analog output with fault and event reporting
  • Modbus/TCP Ethernet for easy connectivity to all control and alarm system ports for control connectivity and service interaction
  • Robust extractive pump systems (2 year lifetime) sampling up to 100 feet
  • CE marked for total immunity to Radio Frequency Interference
  • Reflex sensor health check for improved safety
  • TempraSure temperature compensation technology as appropriate
  • Event logging to review  sensor history

*Standard warranty is 1 year


Display 4 digit alphanumeric display with separate units, flow rate bar graph and other icon driven indicators, 4 button interface keypad, Optional remote for PC/PDA internet browser access vie Ethernet
Flow Rate 500 ml/min
Transport Time 2 to 30 seconds maximum
Sample Line Tubing 0.125″ id x 0.25″ od, up to 100′ long with FEP tubing
Exhaust Line Tubing 0.25″ id x 0.375″ ID, up to 100 feet long
Ambient Point In-line air filter required
Visual Output Alarm, Power and Fault LEDs, LCD display with all gas readings and events
Relays 3 relay for Alarm 1, Alarm 2 and Fault rate 30 VDC, 1 A or 125 VAC, 0.5 A, configurable NO or NC, latched or unlatched
Analog Output 3 wire sink, 3 wire source or 4 wire fully isolated, 0 to 21 mA
Digital Communications Modbus, TCP Ethernet, Power over Ethernet (PoE), Lonworks
Service Port RS232C, PPP protocol
Operating Voltage 24VDC, -15 to +10%
Operating Voltage with PoE 48 VDC via PoE
Power Consumption Transmitter: <5W
Pyrolyzer: <12.95W
Lonworks: <8W
Lonworks & Pyrolyzer: <15.95EW
Wiring Requirements 4-20mA: 2 wire, 14 AWG maximum
Digital: CAT5 Cable of equivalent, RJ45 connector
Installation Wall mounted using pre-drilled holes on chassis, options for DIN rail or vertical bracket mounting
Operating Temperature Unit Only: 32 to 104°F
Unit with Pyroylzer: 32 to 86°F
Size Transmitter: 5.91″ x 2.56″ x 6.02″
NF3 Pyrolyzer: 2.75″ x 4.0″ x 3.35″
High Temp: PFC Pyrolyzer: 3.9″ x 4.0″ x 5.5″
OP3 Pyrolyzer: 5.2″ x 2.4″ x 3.9″
NP1 Pyrolyzer: 5.02″ x 2.56″ x 5.29″
Weight Transmitter: 1.76 pounds
NF3 Pyrolyzer: 0.8 pounds
High Temp PFC Pyrolyzer: 3 pounds
OP3 Pyrolyzer: 2.65 pounds
NP1 Pyrolyzer: 1.8 pounds
Warranty Transmitter: 1 year
Sensor Cartridge: 1 year standard, 2 years extended
Expected Pyrolyzer Life: MIDAS-T-00P: 1 YEAR, MIDAS-T-NP1: 2 years

Sensor Specifications and Catalog Numbers

Catalog No.
Ammonia (NH3)
0-100 ppm
Arsine (AsH3)
0-200 ppb
Boron Trichloride (BCl3)
0-8 ppm
Boron Trifhloride (BF3)
0-8 ppm
Boron Trifluoride (BF3), Low Level 0-2 ppm MIDAS-E-HFL
Bromine (Br2)
0-0.4 ppm
Butane (n-C4H10)
0-100 % LEL
Carbon Dioxide (CO2)
Carbon Monoxide, (CO)Low H2 interference
0-100 ppm
Carbon Monoxide (CO)
0-100 ppm
Chlorine (Cl2)
0-2 ppm
Chlorine Dioxide (ClO2) 0-0.4 ppm MIDAS-E-BR2
Diborance (B2H6) 0-400 oob MIDAS-E-B2H
Dichlorosilane (H2Cl2Si) 0-8 ppm MIDAS-E-HCL
Difluoromethane** (CH2F2) 0-240 ppm MIDAS-E-XCF
Disilane (Si2H6) 0-20 ppm MIDAS-E-SHX
Ethylene (C2H4) 0-100% LEL MIDAS-E-LEL
Fluorine (F2) 0-4 ppm MIDAS-E-HAL
Germane (GeH4) 0-4 ppb MIDAS-E-ASH
Hexafluorobutadiene** (C4F6) 0-40 ppm MIDAS-E-CFX
Hydrogen %LEL (H2) 0-100% LEL MIDAS-E-LEL*
Hydrogen ppm (H2) 0-1,000 ppm MIDAS-E-H2X
Hydrogen  Bromide (HBr) 0-8 ppm MIDAS-E-HCL
Hydrogen Chloride (HCl) 0-8 ppm MIDAS-E-HCL
Hydrogen Cyanide (HCN) 0-20 ppm MIDAS-E-HCN
Hydrogen Fluoride (HF) 0-12 ppm MIDAS-E-HFX
Hydrogen Fluoride Low Level (HF) 0-2 ppm MIDAS-E-HFL
Hydrogen Sulfide (H2S) 0-40 ppm MIDAS-E-H2S
Methane %LEL (CH4) 0-100% LEL MIDAS-E-LEL*
Methyl Fluoride ** 0-120 ppm MIDAS-E-XHF
Nitric Oxide (NO) 0-100 ppm MIDAS-E-NOX
Nitrogen Dioxide (NO2) 0-12 ppm MIDAS-E-NO2
Nitrogen Triflouride ** (NF3) 0-40 ppm MIDAS-E-HFX
Octane (n-C6H18) 0-100% LEL MIDAS-E-LEO
Octofluorocyclopentene** (C6F8) 0-40 ppm MIDAS-E-XCF
Oxygen (O2) 0-25% v/v MIDAS-E-O2X
Ozone (O3) 0-0.7 ppm MIDAS-E-O3H
Ozone Low Level (O3) 0-0.4 ppm MIDAS-E-O3X
Phosphine (PH3) 0-1,200 ppb MIDAS-E-PH3
Propane (C3H8) 0-100% LEL MIDAS-E-LEX
Propylene  (C3H6) 0-100% LEL MIDAS-E-LEL
R134a (C2H2F4) 0-1,000 ppm MIDAS-E-XCF
Silane (SiH4) 0-20 ppm MIDAS-E-SHX
Silane Low Level (SiH4) 0-2 ppm MIDAS-E-SHL
Sulfur Dioxide (SO2) 0-8 ppm MIDAS-E-SO2
Tetra Ethyl Ortho Silicate (TEOS) 0-40 ppm MIDAS-E-TEO
Tungsten Hexafluoride (WF6) 0-12 ppm MIDAS-E-HFX
Tungsten Hexafluoride Low Level (WF6) 0-2 ppm MIDAS-E-HFL

*MIDAS-E-LEL cartridge carries a 2 year warranty but can be calibrated up to 5 years

** Gases require Midas Pyrolyzer

Midas detectors are not ETL approved for monitoring in or sampling from classified areas above 25% LEL

Ordering Information

Midas transmitters operate with Midas sensor cartridges, for use as a local gas detector. Transmitters are powered by 24VDC or via Power over Ethernet (PoE). Midas provides 0-22 mA analog and Modbus/TCP Ethernet as standard outputs. Integral relays for A1, A2 and fault are included and may be configured normally open or normally closed, latching or non-latching. Transmitters include manual, quick start guide and 1 gland fitting for power in and relays out, 1/4″ x 1/8″ sample inlet tubing (10′), 1/4″ x 3/16″ exhaust tubing (10′) and a sample line tubing duct adapter. Generation 2 features a multi-colored backlight to indicate status.

Higher Temperature Pyrolyzer Midas transmitters  include a snap on Pyrolyzer module that operates with any Midas extractive transmitter. Units are powered via direct connection to transmitter unit. Pyrolyzer includes Pyrolyzer Quick Start Guide and installation screws.

Optional LonWorks interface module that mounts to and connects with any single, universal Midas transmitter with or without Pyrolyzer to provide bi-directional LonWorks connectivity; remote reset and remote control of onboard relays. Unit is 24 VDC powered and provides power and communications directly to the attached Midas transmitter using special ethernet cross over cable (supplied). Includes Quick Start Guide and mounting bracket to the Midas transmitter, rear panel installation screws are not supplied.

Optional; Modbus/TCP to LonWorks converter gateway that can connect up to 4 Midas transmitters (with or without Pyrolyzer) to a LonWorks Network. Requires separate 24 VDC power supply and Ethernet connector cables. Suitable for DIN rail mounting.

For pricing, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email

Catalog No.
Midas Transmitter MIDAS-T-004
Midas High Temperature Pyrolyzer Module MIDAS-T-NP1
Midas LonWorks Interface Module MIDAS-T-LON
Midas Quad LonWorks Module MIDAS-A-035

Accessory Ordering Information

Part No.
Midas DIN Rail Mounting Kit MISAS-A-036
2A 24 VDC Power Supply in Vented NEMA 4 Enclosure MVIP3632-02A
5A 24 VDC Power Supply in Vented NEMA 4 Enclosure MVIP3632-5A
MIDAS Replacement Pump Assembly MIDAS-A-009
End of Line Particulate Filter 780248
End of Line Particulate Filter for Corrosive Gases 1991-0147


Midas Gas Detector Literature

Midas Specifications

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