The Midas Gas Detector uses reliable sensor technology to detect many key toxic, ambient and flammable gases in a plant. The device monitors points up to 100 feet (30 meters) away while using patented technology to regulate flow rates and ensure error-free gas detection.

Improved visibility and ease of use. The Midas Gas Detector is equipped with bright LED lights and an intuitive, interactive interface that provides instant alerts to gas readings or alarm levels. The interface also includes password-protected menus for configuration, test and calibration.

Easy installation. Compact in size with an easy-to-handle metal chassis, the Midas Gas Detector is simple to install. That’s especially important in crowded, complex process environments where space is at a premium.

A complete solution. The Midas Gas Detector is complemented by our innovative Chemcassette® technology, which detects ultrasensitive toxic gases at low parts-per-billion (ppb) levels. And we offer the support of a worldwide network of service engineers who operate on a 24/7 basis.

Numerous applications. 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.



• 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 and power platform
• Keypad Interface and remote Web Browser Interface
• Optional Pyrolyzer module that connects to any transmitter
• Password protected menu levels to preserve system integrity
• Bright LEDs and intuitive Icon Driven, large backlit LCD display
• Factory-calibrated sensors to reduce 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 systems ports for control connectivity and service interaction
• Robust extractive pump system (2 year lifetime) sampling up to 30m
• Interactive Training Simulator tool
• CE marked for total immunity to Radio
Frequency Interference
• Reflex® sensor health check for improved safety
• TempraSureTM temperature compensation technology as appropriate
• Event logging to review sensor history
• Patented reporting technology confirms
likely gas release to avoid nuisance alarms

Gas Name Chemical Formula Range Sensor Part Number
Ammonia NH3 9 - 100 ppm E-NH3


AsH3 18 - 200 ppb E-ASH
Germane GeH4

Boron Trichloride

BCl3 0.72 - 8 ppm E-HCL
Dichlorosilane H2Cl2Si
Hydrogen Bromide HBr
Hydrogen Chloride HCl

Boron Trifluoride

BF3 0.72 - 8 ppm E-HFX
Hydrogen Fluoride HF
Nitrogen Fluoride NF3
Tungsten Hexafluoride WF6

Boron Trifluoride (Low Level)

BF3 0.18 - 2 ppm E-HFL
Hydrogen Fluoride (Low Level) HF
Tungsten Hexafluoride (Low Level) WF6


BR2 0.036 - 0.4 ppm E-BR2
Chlorine Dioxide ClO2
Carbon Dioxide CO2 0.15 - 20 % E-CO2
Carbon Monoxide CO 9 - 100 ppm E-COX
Diborane B2H6 36 - 400 ppb E-B2H


CH2F2 16 -240 ppm E-CFX
Hexafluorobutadiene** C4F6
Methyl Fluoride** CH3F
Octofluorocyclopentene** C5F8


Cl2 0.36 - 4 ppm E-HAL
Fluorine F2

Hyrdogen (%LEL)

H2 6.5 - 100% LEL E-LEL*
Methane (%LEL) CH4
Hydrogen (ppm) H2 90 - 1000 ppm E-H2X
Hydrogen Cyanide HCN 1.8 - 20 ppm E-HCN
Hydrogen Sulfide H2S 3.6 - 40 ppm E-H2S
Nitric Oxide NO 9 - 100 ppm E-NOX
Nitrogen Dioxide NO2 1.05 - 12 ppm E-NO2
Oxygen O2 0.2 - 25 % E-O2X
Ozone O3 0.065 - 0.7 ppm E-O3H
Ozone (Low Level) O3 0.036 - 0.4 ppm E-O3X
Phosphine PH3 110 - 1200 ppb E-PH3
Silane (Low Level) SiH4 0.18 - 2 ppm E-SHL


SiH4 1.8 - 20 ppm E-SHX
Disilane Si2H6
Sulfur Dioxide SO2 0.7 - 8 ppm E-SO2
Tetra Ethyl Ortho Silicate TEOS 3.6 - 40 ppm E-TEO
* 2 Year Warranty - Can be calibrated for up to 5 years
** Requires the pyrolyzer attachment.
Midas Pyrolyzer: Offered as an option, the Midas Pyrolyzer allows for the detection of NF3 and other CFX gases. The Pyrolyzer hasa replaceable heater assembly with a lifespan of greater than two years. Thanks to our new proprietary catalyst to improve efficiency in gas conversion, the Pyrolyzern delivers automatic flow control, temperature control, and fast and accurate performance. The Pyrolyzer can run from a Midas Gas Detector that is powered by either PoE or 24 VDC.


Transmitter Dimension 120mm (H) x 63mm (W) x 150mm (D) Weight: 0.8Kg
Pyrolyzer Dimensions 70mm (H) x 63mm (W) x 83mm (D) Weight: 0.41 Kg
Power Requirements 24V DC Nominal +/- 10% Operating Voltage with Power over Ethernet (PoE):
36 - 57 VDC via PoE, 48V DC Nominal
Power Consumption Transmitter ~ 5.0 W With Pyrolyzer < 12.95 W
Outputs Visual: Alarm, Power and Fault lights as well as back lit LCD display with all gas readings and events Relays: 3 relays for Alarm1, Alarm 2 and Fault rated 1.0A @ 30VDC or 0.5A @125VAC;
configurable NO or NC, latched or unlatched
Analog: 2 wire isolated, 0 - 22mA, Sink or Source Digital Communications: Modbus / TCP Ethernet / Power over Ethernet (PoE)
Service Port RS232C / PPP protocol
Sampling Distance

Tubing Length: Up to 30m (100 feet) with FEP tubing dependant on gas. Same for exhaust tube.

Ambient Point Monitoring: In line air filter recommended
Tubing Requirement Sample: 6.35mm OD (1/4”) x 3.18mm (1/8”), FEP, 30m (100 feet) maximum dependant on gas type Exhaust: 6.35mm (1/4”) OD x 4.76mm (3/16”), FEP, 30m (100 feet)
Operating Temperature 0˚ C (32˚ F) to 40˚ C (104˚ F)
Wiring Requirement 4-20mA/DC Power/Relays: 14 AWG Maximum Digital: CAT 5 cable or equivalent, RJ45 connector
Gas Concentration Display & Interface Instrument: 4-digit alphanumeric display with separate measurement units, flow rate bar graph and other icon driven indicators. 4 button membrane keypad Remote Interface: PC / PDA Internet Browser access via Ethernet or other Bus system
Response Times Flow Rate: 500 mL/min Transport Time: 2 - 30 seconds maximum
Warranty Transmitter Unit: 1 year
Sensor Cartridge: 1 year standard; 2 year with extended warranty program
Expected Lifetime of Pump: > 2 years
Certification & Specification European: CE marked; meets EN 50270:1999 (Type2)
and EN 55011:2000
Environmental: ETL approved UL 61010B and CSA-C22.2
No. 1010.1-92
Performance: Designed to meet with UL 2075 (pending 2004)
Electrical: IEEE 802.3af-2003

Lower Detection Limit < Lower Acceptable Limit
Lower Acceptable Limit = ½ Threshold Limit Value (typically 12% Full Scale Detection)
Upper Limit of detection (FSD)= 4 x Threshold Limit Value

The threshold limit Value (TLV) is the level by which it is believed a worker can be exposed to day after day without adverse health effects. The ACGIH (American Conference of Government Industrial Hygienists) defines the threshold limit value and they are a recommendations, not legal limits.

T-004-K-XXX MIDAS Cartridge and Transmitter Kit (Choose Gas) needs 24V DC power to put into service $1664.00 to $1836.00
T-NP1 Pyrolyzer for select gasses $1400.00
T-K-O2S Midas Oxygen Detector for MRI Room  
E-XXX Replacement Sensor Cartridge $306.00 to $420.00 call
T-CALKIT Calibration Kit $323.00
T-A-032 Vertical mounting bracket kit $130.00
1283k1090 Duct adapter for 1/4" O.D tubing for 4-16" rount ducts $59.00
0235-0095 Union fitting 1/4" tube, polypropylene $9.00
  User Manual & Brochure  


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