Honeywell Midas S2 Gas Detector

Code: MIDAS S2-E
  • Keypad interface
  • 4-20mA analogue output with fault & event reporting
  • 3-built-in relays (form C) for alarms 1, 2, & fault

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The Midas S2 is a fixed, extractive single-point gas transmitter that draws a sample locally or from a remote point to a sensor cartridge.

A range of gas sensor cartridges is available to detect toxic, flammable, and oxygen gases used or generated in semiconductor manufacturing, light manufacturing, and research labs specialising in semiconductor processing.

Clear Visibility 

Improved graphics display interface for better visibility, instrument status icons, monitoring point and location, and instant gas readings or alarm level alerts.

Calibration Completed 

Factory-calibrated sensors reduce the need for frequent gas testing

Improved Serviceability 

Easy access to change the sensor and pump from the front of the equipment.

Easy Installation 

Compact in size, making it suitable for crowded, complex process environments where space is at a premium, the Midas S2 is simple to install with its plug-and-play capability.

PoE Protocol 

The detector includes the innovative Power over Ethernet (PoE) protocol — a single connection for all power, control and communication requirements.

Integrated Security 

The Midas S2 interface includes password-protected menus to maintain system integrity.

Features & Benefits 

  • Highly modular design for easy, reliable, and trouble-free installation
  • Quick replacement of cartridges and pump parts for simple maintenance
  • Single sensor cartridge with onboard ‘e-calibration’ certificate
  • Supportive digital communication (Modbus/TCP Ethernet/Power over Ethernet (PoE))
  • Factory-calibrated sensors to reduce the need for frequent gas testing
  • Large, bright, and rich TFT colour LCD and extensive viewing angle
  • mA communication protocols for easy connectivity and service interaction
  • Robust extractive pump system (2-year lifetime) sampling up to 100 feet
  • Supportive Digital communication (Modbus / TCP Ethernet / Power over Ethernet (PoE))
  • Block test to ensure sampling line connection and no leakage

Order Information 

MIDAS S2-E-LEL Hydrogen H2 0-100% LEL
MIDAS S2-E-LEL Methane CH4 0-100% LEL
MIDAS S2-E-LEL Propylene C3H6 0-100% LEL
MIDAS S2-E-HCL Boron Trichloride BC13 0-8 ppm
MIDAS S2-E-HCL Dichlorosilane H2Cl2Si 0-8 ppm
MIDAS S2-E-HCL Hydrogen Bromide HBr 0-8 ppm
MIDAS S2-E-HCL Hydrogen Chloride HCl 0-8 ppm
MIDAS S2-E-NH3 Ammonia NH3 0-100 ppm
MIDAS S2-E-O3X Ozone O3 0.036-0.4 ppm
MIDAS S2-E-HAL Chlorine Cl2 0-2 ppm
MIDAS S2-E-H2X Hydrogen H2 0-1000 ppm
MIDAS S2-E-SHX Silane SiH4 0-20 ppm
MIDAS S2-E-SHX Disilane Si2H6 0-20 ppm
MIDAS S2-E-HFX Boron Trifluoride Low Level BF3 0.72-8 ppm
MIDAS S2-E-HFX Hydrogen Fluoride HF 0-12 ppm
MIDAS S2-E-HFX Tungsten Hexafluoride WF6 1.05-12 ppm
MIDAS S2-E-COX Carbon Monoxide CO 0-100 ppm
MIDAS S2-E-COH Carbon Monoxide CO 0-100 ppm
MIDAS S2-E-XHF Nitrogen Trifluoride NF3 0-40 ppm
MIDAS S2-E-XHF Methyl Fluoride CH3F 0-120 ppm
MIDAS S2-E-SO2 Sulphur Dioxide SO2 0-8 ppm
MIDAS S2-E-H2S Hydrogen Sulphide H2S 0-40 ppm

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Title Size
Midas S2 Datasheet 108 KB
MidasS2 Quick Reference Guide 674 KB
Midas S2 Manual 1 MB
Midas S2 Notice 88 KB

Additional information

Weight 0.09 kg


Size (unit with Cartridge) 138.6 (H) x 55 (W) x 148 (D) mm (5.46 x 2.17 x 5.83 in)
Weight – Transmitter 1.03 kg (2.27 lb)
Weight – Sensor Cartridge 34~73 g (0.075~0.161 lb) dependent on sensor type
Operating Voltage 24 VDC Nominal, -15 to +10% (20.4 to 26.4 VDC)
Operating Voltage with Power
Over Ethernet (PoE) 48 VDC PoE (IEEE 802.3af compliant)
Transmitter unit (normal condition)1 Typ. <5 W
Transmitter unit (full load condition)2 ≤ 12.95 W
Visual Power, alarm Fault LEDs and color TFT LCD
Relays Alarm1, Alarm2, Fault relay rated 1.0A@30VDC or 0.5A@125VAC max
Analog Sink/Source, 4-20mA
Digital Communications Modbus/TCP Ethernet/Power over Ethernet (PoE)
Size/Color 2.4inch IPS panel with 16.7M display color
Viewing Angle 160 or higher degree viewing angle
Operation key 4-button interface keypad
Flow Rate 500 mL/min
Sample Line Tubing 3.18mm ID X 6.35mm OD (0.125 X0.25in)
Sample Line Length Up to 30 m (100 ft) with FEP tubing
Exhaust Line Tubing 4.76 mm ID X 6.35 mm OD (0.188 X 0.25 in)
Exhaust Line Tubing 4.76 mm ID X 6.35 mm OD (0.188 X 0.25 in)
Operating Temperature 0°C to 40°C (32°F to 104°F)
4-20 mA 2 wire, 14 AWG maximum
Digital CAT5 Cable or equivalent: RJ45 connector
Transmitter unit 1 year
Sensor cartridge 2 years

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