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Midas-M Gas Detector System from Honeywell

The Midas-M Gas Detector brings new visibility, reliability and ease of use to gas detection in semiconductor processing and industrial manufacturing.

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



The Midas-M Gas Detector brings new visibility, reliability and ease of use to gas detection in semiconductor processing and industrial manufacturing. It uses reliable sensor technology to detect more than 35 key toxic, ambient and flammable gases – easily, quickly and error free.

The device monitors points up to 30M away while using patented technology to regulate flow rates and ensure error free gas detection. The standard power supply and communications capabilities include 3 onboard relays, 0 to 21 mA analog output and Modus/TCP Ethernet digital outputs for easy connectivity to control and alarm systems’ ports for optimal connectivity and service interaction.

With flexible features and options, the Midas-M Gas Detector works right out of the box and configures easily to meet your needs. Each plug and play sensor cartridge is precalibrated, so it is ready when you are. That means longer sensor life, quick and easy replacement and no operator error due to incorrect or depleted sensors. With the Midas-M, customers can get extended sensor calibration periods, patented diagnostic and lower cost of ownership.


  • The Midas-M is equipped with bright LEDs and an intuitive interface that provides instant alerts to gas reading or alarm leves
  • Factory calibrated sensor reduce need for frequent gas testing
  • Compact in size making it suitable for crowded complex process environments where space is at a premium
  • Simple to install with its plug and play capability
  • Includes innovate Power over Ethernet (PoE) protocol – a single Ethernet connection for all power, control and communication requirements
  • Includes password protected menus to maintain system integrity


  • Semiconductor processing
  • Light industrial manufacturing
  • University laboratories
  • Aerospace
  • Wastewater


Display 4 digit alphanumeric display with separate units, concentration bar graph and other icon driven indicators, 4 button interface keypad, Optional remote for PC/PDA internet browser access via Ethernet
Flow Rate 600 ml/min
Transport Time 2 to 25 seconds maximum
Sample Line Tubing 0.125″ id x 0.25″ od, up to 100′ long with FEP tubing
Exhaust Line Tubing 0.188″ id x 0.25″ 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
Power: Green LED, Alarm 1: Red LED, Alarm 2: Red LED, Fault: Yellow LED
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 for each channel
Digital Communications Modbus, TCP Ethernet, Power over Ethernet (PoE)
Relays in Optional Relay 8 Relays for Alarm 1 and Alarm 2 of each channel and a relay for common fault rated 1.0 A @ 30 VDC or 0.5 A @ 125 VAC
Max 10 uA @ 10 mV minimum, configurable as normally open or closed, latched or unlatched
Operating Voltage 24VDC, -15 to +10%
Operating Voltage with PoE 48 VDC via PoE
Power Consumption Transmitter: <5W
Transmitter Unit: ≤11.45W
Transmitter with Optional Relay: ≤12.9W
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: 5.35″ x 3.27″ x 5.98″
Relay: 5.39″ x 3.31″ x 1.61″
Weight Transmitter: 2.87 pounds
Relay: 0.68 pounds
Warranty Transmitter: 1 year
Sensor Cartridge: 2 years

Sensor Specifications and Catalog Numbers

Catalog No.
Ammonia (NH3)
0-100 ppm
Boron Trichloride (BCl3) 0-8 ppm MMS-E2
Boron Trifloride (BF3)
0-8 ppm
Carbon Monoxide (CO)
0-100 ppm
Chlorine (Cl2)
0-2 ppm
Dichlorosilane (H2Cl2Si) 0-8 ppm MMS-E2
Disilane (Si2H6) 0-20 ppm MMS-X2
Hydrogen (H2) 0-1,000 ppm MMS-G2
Hydrogen  Bromide (HBr) 0-8 ppm MMS-E2
Hydrogen Chloride (HCl) 0-8 ppm MMS-E2
Hydrogen Fluoride (HF) 0-12 ppm MMS-Z2
Oxygen (O2) 0-25% v/v MMS-D2
Ozone (O3) 0-0.4 ppm MMS-U2
Phosphine (PH3) 0-1,200 ppb MMS-R2
Silane (SiH4) 0-20 ppm MMS-X2
Sulfur Dioxide (SO2) 0-8 ppm MMS-S2
Tungsten Hexafluoride (WF6) 0-12 ppm MMS-Z2

Ordering Information

Extractive 4 in 1 Midas-M transmitters operate with Midas-M sensor cartridges. Transmitters are powered by 24VDC or via power over Ethernet (PoE). Midas provides 0-22 mA analog or Modbus/TCP Ethernet as outputs. Integral general 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 PG 16 gland fitting for power in and relays out, 1/4″ od x 1/8″ id tubing and 1/4″ od x 3/16″ id exhaust tubing and a sample line tubing duct adapter. Order the Midas M or Midas M with LIT and sensor cartridge (up to 4).

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

Catalog No.
Midas-M Transmitter 4-20 mA & TCPIP Modbus transmitter MMT-01
Midas-M Transmitter 4-20 mA & TCPIP Modbus transmitter with tube MMT-T01
Midas-M Transmitter TCPIP Modbus transmitter MMT-02
Midas-M Transmitter TCPIP Modbus transmitter with tube MMT-T02
Midas-M Transmitter 4-20 mA & TCPIP Modbus transmitter-LIT MMT-L01
Midas-M Transmitter 4-20 mA & TCPIP Modbus transmitter with tube-LIT MMT-LT01
Midas-M Transmitter TCPIP Modbus transmitter-LIT MMT-L02
Midas-M Transmitter TCPIP Modbus transmitter with tube-LIT MMT-LT02

Accessory Ordering Information

Part No.
Midas-M Relay Module MM-REL
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 MM-PM
End of Line Particulate Filter 780248
End of Line Particulate Filter for Corrosive Gases 1991-0147


Midas-M Gas Detector Literature

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