Net Safety™ Millennium II (M22) Universal Dual Transmitter

The Net Safety Millennium II (M22) Universal Dual Transmitter is a flexible fixed gas detection transmitter designed to monitor two separate detection points from one field-mounted device. Built for demanding industrial environments, the M22 supports both toxic and combustible gas detection using compatible infrared, catalytic bead, and electrochemical sensor technologies.

The M22 helps reduce installation complexity by combining dual-channel monitoring, two separate output signals, digital sensor communication, and flexible output options in one transmitter platform. Sensors are pre-calibrated and recognized by the transmitter when connected, allowing the correct sensor configuration profile to be uploaded automatically.

Available at Westech Industrial in BC, Alberta, and Saskatchewan, the Net Safety Millennium II M22 Universal Dual Transmitter can be supported as part of a wider fixed gas detection solution. Westech can assist with product selection, service support, installation guidance, and custom fabrication requirements for facilities that need reliable gas detection integrated into panels, assemblies, shelters, or site-specific safety systems.

Net Safety™ Millennium II (M22) Universal Dual Transmitter
Net Safety™ Millennium II (M22) Universal Dual Transmitter - Image 2

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PRODUCT FEATURES

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Description

Dual-Channel Gas Monitoring

The M22 accepts two sensor inputs and provides two separate output signals, allowing one transmitter to monitor two detection points.

Universal Sensor Compatibility

The transmitter supports compatible Net Safety sensor types, including SC3 Series infrared and catalytic bead sensors for combustible gases and ST3 Series electrochemical sensors for toxic gases.

Smart Sensor Recognition

Sensors are pre-calibrated and easily connected to the transmitter. When a new sensor is fitted, the transmitter recognizes it and automatically uploads the sensor’s specific configuration profile.

Flexible Communication Options

The M22 is available with analog 4–20 mA output, optional relay outputs, and RS-485 Modbus® RTU, making it suitable for both new installations and retrofit fixed gas detection systems.

Non-Intrusive Setup and Calibration

Operators can access setup and calibration through the menu interface using the magnetic switch, helping support maintenance activities without unnecessary enclosure access.

Full Graphic OLED Display

The organic LED display provides clear visibility in a range of lighting conditions and displays gas concentration, status messages, and menu options.

Long-Range Sensor Separation

The M22 supports remote sensor mounting up to 2,000 ft. / 600 m using 16 AWG wire, giving facilities more flexibility when transmitter access and sensor placement need to be separated.

Diagnostics and Event Logging

Built-in diagnostics, displayed event logging for up to 980 events, and the ability to retrieve the last calibration information from the sensor help support maintenance planning and system review.

Multilingual Menu Interface

The menu interface supports English, French, Spanish, and Portuguese.

Rugged Enclosure Options

The transmitter is available in cast aluminum or stainless steel with mounting options for surface, pipe, or duct installations.

Applications

The Net Safety Millennium II M22 Universal Dual Transmitter is suited for industrial facilities that require reliable fixed gas detection with two-point monitoring from one transmitter.

Common applications include:

  • Oil and gas facilities
  • Petrochemical processing areas
  • Industrial processing facilities
  • Wastewater treatment facilities
  • Hazardous manufacturing environments
  • New or retrofit gas detection systems requiring analog, relay, or Modbus communication
  • Facilities requiring remote sensor placement away from the transmitter

Documents

Emerson_Net Safety_Millenium 2 dual transmitter_Spec sheet_July 2016_Jan 14,2020_Westech.pdf

Emerson_Net Safety_Millenium 2 dual transmitter_Manual_May 2019_Westech.pdf

Emerson Net Safety-FGD-BRO-Safety-Monitoring_Westech_Sept_10_2020.pdf

Manufacturer info

Introducing NET SAFETY / ROSEMOUNT full line of flame and gas detection solutions. No matter how extreme or demanding the conditions, your people and facilities come first.

That’s why NET SAFETY / ROSEMOUNT is dedicated to offering the most comprehensive and advanced detection technologies available. Its flame and gas detection products are designed to excel under the toughest conditions to help you streamline day-to-day operations and most importantly, keep your people safe – because if it matters to you, it matters to us

 

https://www.emerson.com

SPECS

Product Name:
Net Safety Millennium II M22 Dual Channel Transmitter.
Power Consumption:
2.4 W @ 24 VDC average, varies by sensor types and quantities.
Voltage Range:
10.5–32.0 VDC.
EMC Compliance:
EN 50270: 2006 per EMC directive 2004/108/EC.
Display:
Organic LED (OLED), Power/Status LEDs.
Operating Temperature, Stainless Steel:
-67 °F to +185 °F (-55 °C to +85 °C).
Operating Temperature, Stainless Steel with North American Explosion-Proof Certification:
-58 °F to +185 °F (-50 °C to +85 °C).
Operating Temperature, Aluminum:
-40 °F to +185 °F (-40 °C to +85 °C).
Relative Humidity:
0–95% RH non-condensing.
Ingress Protection:
IP66 aluminum, IP67 stainless steel, IP64 with sensors, Type 4X (transmitter only).
Enclosure Material:
Cast Aluminum (A359) or Stainless Steel (SS316)
Conduit Opening:
¾" NPT, 3 openings.
Standard Output:
Analog 4–20 mA.
Optional Outputs:
Four 5 A Form C relays and RS-485 Modbus® RTU.
Compatible Combustible Gas Sensors:
SC3 Series infrared and catalytic bead sensors.
Compatible Toxic Gas Sensors:
ST3 Series electrochemical sensors.
Mounting:
Surface mount, pipe mount, or duct mount.
Weight, Aluminum:
5.5 lbs (2.5 kg).
Weight, Stainless Steel:
7.0 lbs (3.2 kg).
Warranty:
3 years.
North American Certifications:
Class I, Division 1, Groups BCD T5; Class I, Zone 1, AEx/Ex d IIB+H2 T5; -50 °C ≤ Ta ≤ +85 °C; NEMA Type 4X/IP67; FM6320, ANSI/ISA 12.13.01, CSA 22.2 No. 152:2006.
IECEx Certifications:
Ex d IIB+H2 T5 Gb; IECEx DNV 12.0014 aluminum IP66 (controller only); IECEx FMG 12.0006X stainless steel IP67 (controller only); IEC 60079-0: 2007-10 and IEC 60079-1: 2007-04.
Inmetro Certification:
Ex d IIB+H2 T5 Gb IP67.
Ordering Options:
M22-A Dual Channel Analog; M22-AR Dual Channel Analog and Relay; M22-AD Dual Channel Analog and Modbus; M22-ARD Dual Channel Analog, Relay, and Modbus.
Enclosure Options:
Aluminum (-A) or Stainless Steel (-S).
Available Accessories:
Mounting bracket with hardware, sun shade/deluge protection, duct mount and hardware kit.

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PRODUCT FAQ's

What does the Net Safety Millennium II M22 Universal Dual Transmitter do?
The M22 is a dual-channel gas detection transmitter that monitors two separate gas detection points using one transmitter. It accepts two sensor inputs and provides two separate output signals for fixed gas detection systems.
What sensor types are compatible with the M22 transmitter?
The M22 supports compatible Net Safety SC3 Series infrared and catalytic bead sensors for combustible gases, as well as ST3 Series electrochemical sensors for toxic gases.
Can the M22 be used for both toxic and combustible gas detection?
Yes. The M22 can be fitted with a range of toxic and combustible gas sensors, allowing facilities to mix and match compatible sensor types on one transmitter for greater monitoring flexibility.
What output options are available with the M22 transmitter?
The standard output is analog 4–20 mA. Optional configurations include relay outputs and RS-485 Modbus® RTU. Ordering options include analog only (M22-A), analog with relay (M22-AR), analog with Modbus (M22-AD), and analog with relay and Modbus (M22-ARD).
How far can the sensor be mounted from the transmitter?
The M22 supports remote sensor separation up to 2,000 ft. / 600 m using 16 AWG wire, allowing sensors to be placed where gas detection is required while keeping the transmitter accessible for operators and maintenance teams.
Does the M22 support non-intrusive calibration?
Yes. The M22 includes a non-intrusive calibration interface using a magnetic switch, helping operators access setup and calibration functions without unnecessary enclosure access.
Can one channel be disabled if it is not being used?
Yes. The M22 includes a sensor enable/disable option from the menu, allowing users to disable a channel when it is not required.
Is the Net Safety Millennium II M22 Transmitter suitable for hazardous locations?
Yes. The M22 is certified for use in hazardous locations and includes North American, IECEx, and Inmetro certifications as listed in the product specifications.
Is the Net Safety Millennium II M22 Universal Dual Transmitter available at Westech Industrial?
Yes. The Net Safety Millennium II M22 Universal Dual Transmitter is available at Westech Industrial for customers in BC, Alberta, and Saskatchewan.
Can Westech Industrial support service and custom fabrication for M22 gas detection systems?
Yes. Westech Industrial can help with product selection, technical support, service requirements, and system integration. Westech can also support custom fabrication needs for gas detection packages, panels, shelters, and site-specific safety system assemblies.