3500/63 - Hazardous Gas Detection System

3500/63 - Hazardous Gas Detection System 3500/63 - Hazardous Gas Detection System

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Part Number: 3500/63
Manufacturer: Bently Nevada
Series: 3500
Product type: Hazardous Gas Detection System
Country of Manufacture: United States (USA)

3500/63 is a hazardous gas detection system developed by Bently Nevada. Gas hazards are generally classified as combustible, toxic, or oxygen deficient. Combustible gases of concern in many industrial facilities are methane and hydrogen. The Hazardous Gas Detection System detects the presence of these flammable gases, protecting both property and people.


  • Because of the large amount of current required by each gas sensor, the hazardous gas detection system requires an external power supply (300 mA each, which exceeds what the rack power supplies can provide). The external power supply connects to each I/O card.
  • It monitor regulates the current and sends it to each of the six sensors through the I/O card. The system may also include relay modules that can be programmed to change state to enable the trip or shutdown of machines or processes, to generate audible and/or visible alarms, or to protect both human life and machine assets.


  • For each channel, the 3500/63 Hazardous Gas Detection monitor measures % LEL as well as the number of days since the last calibration.
  • The system protects by constantly comparing combustible gas concentrations in the vicinity of the sensors to configured setpoints for each channel. The Cal Status Danger alarm is always set to 90 days and cannot be changed, though the alarm can be disabled.
  • The Cal Status Alert alarm can be configured and deactivated by the user.


  • The approved 350800 hazardous gas sensor is used in the Hazardous Gas Detection System. When connected to the Hazardous Gas Detection Module, this sensor consists of a catalytic bead and a reference bead that form a Wheatstone bridge.
  • The sensor's catalytic bead is impregnated with a catalyst that promotes oxidation, whereas the reference bead is treated to inhibit oxidation.
  • The electrical current from the monitor heats the beads to the temperature required for gas oxidation at the catalytic bead. When gas is present, this oxidation raises the temperature of the catalytic bead above the temperature of the reference bead, increasing resistance and unbalancing the bridge.
  • The imbalance is proportional to the combustible gas concentration.


  • To function properly, the 3500/63 Hazardous Gas Detection Module requires a valid configuration.
  • From left to right, the slots in the rack are numbered 0 to 15. The power supplies for the 3500 rack occupy slot 0 and the Transient Data Interface (TDI) or 3500/20 Rack Interface Module (RIM) occupies slot 1. Monitoring positions are slots 2 through 15.
  • The modules can be installed in any of the monitoring positions. To provide enough power to the sensors, an external power supply is required. The TMR TDI (with standard Hasz gas monitors) and dual power supplies are used in GE gas turbine applications.

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What is 3500/63?
It is a hazardous gas detection system developed by Bently Nevada.

What types of gas hazards does the Hazardous Gas Detection System detect?
The system detects combustible gases, such as methane and hydrogen, which are of concern in many industrial facilities. Other gas hazards, such as toxic gases or oxygen-deficient environments, may require different detection systems.

Why is it important to detect gas hazards in industrial facilities?
Gas hazards in industrial facilities can pose serious risks to both property and people. Flammable gases can ignite and cause fires or explosions, while toxic gases can cause health problems or even death. Detecting the presence of these gases allows operators to take appropriate action to prevent accidents and protect personnel and assets.