Electrochemical Gas Sensor Module 4101-XX

Sierra Monitor’s 4101 module monitors a number of uncommon hazardous gases such as Hydrogen Chloride (HCl), Nitric Oxide (NO), HydrogenCyanide (HCN), Hydrogen Fluoride (HF), and Ethylene Oxide (ETO).

The 4101 module is based on electrochemical technology, a proven, less-expensive option that offers high accuracy, low power requirements, and sensitivity to a particular gas in the parts-per-million range.

The 4101 gas sensor module provides the user with the features needed in a stand-alone, fixed-point hazardous gas monitor system. The 4101 can avoid erroneous readings during warm-up by locking the transmitter output to allow sufficient time to fully stabilize before coming online. It also remains locked for five minutes directly after calibration gas is removed to prevent alarms caused by calibration gas. Maintenance costs can also be reduced due to easily accessible potentiometers for quick calibration adjustments.

Electrochemical Gas Sensor Module 4101-XX

  • Automatic Low Sensitivity Check – Ensure monitoring integrity by confirming that the sensor response to gas is sufficient to provide reliable operation without false indication
  • False Alarm Avoidance – Avoid erroneous readings during warm-up and prevent alarm caused by calibration gas
  • Diagnostic Measurements – Conveniently measure critical diagnostic data with clearly marked measurement locations and signal output adjustments
  • Simple Zero and Span Adjustments – Easily access potentiometers to enable calibration adjustments and reduce maintenance costs

Specifications for Electrochemical Gas Sensor Module 4101

Electrical Data

  • Loop Type: 3 Wire
  • Loop Resistance: 800 ohm with 28 VDC
  • Input Voltage DC: 14-30 VDC
  • Input Current: 40 mA
  • Input Power Max: 1.4 W
  • Signal Output: 4-20 mA DC linear (Trouble 0 mA)

Operating Pressure

  • 10% (variation from ambient)


  • ¾” NPT


  • Explosion proof (NEMA 7)
  • Div. 1, Class 1, 2, Groups C, D, E, F, G)
  • Optional NEMA 4 Group B housing available


  • Dimension: 8.0 x 4.5 x 4.0 inches (20.3 x 11.5 x 10.2 cm)
  • Weight: 2.7 lb. (1.3 Kg)


  • 2 year on non-consumables

How to Purchase the Electrochemical Gas Sensor Module

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