Forbes Marshall - Trusted Partners in Steam Engineering & Control Instrumentation

TunnelTech 400 CO, NO, NO2, SO2 & O2 Air Quality Monitor

A road & rail tunnel monitor using well-proven technology to provide accurate and rapid results.

The TunnelTech 400 advanced electrochemical cell technology offers a cost-effective and flexible choice for a single cell analyser
delivering superb accuracy and reliability at a very competitive price.

The TunnelTech 400 analyser electrochemical cell technology determines CO, NO NO2, SO2 or O2 concentrations. With no moving parts, reliability levels are extremely high and maintenance requirements are very low.

  • Single species gas analyser.
  • Compact and durable stainless steel sensor.
  • Advanced electrochemical cell technology.
  • Fully configurable 4-20mA – Passive Output.
  • Easy installation with minimal wiring required.
  • Minimal maintenance requirements.
  • Easy to calibrate.
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