• Basic mode of operation: Wobbe Index or Calorific Value via optional Specific Gravity Meter
• Fast response and continuous operation
• Modbus RS-485 network communications
• Two continuous 4-20mÅ analog outputs
• Flame safety automatic interlock
• Standard and explosion-proof models
• Easy to maintain and calibrate

• Flexible Flo-Cal has two basic modes of operation
• Base system provides a Wobbe Index measurement (a meaningful measurement of the heating characteristics of the gas mixture) that takes into consideration the compositional changes within the gas mixture
• Provides Calorific Value measurement， the base Wobbe Index unit must incorporate the Thermo Scientific Sarasota FD900 specific gravity (SG) meter， a highly accurate device that is based on the well accepted vibrating tube technology
• Provides a continuous online SG measureent with accuracy to 0.1% of reading
• This combination enables the Flo-Cal to reliably calculate Calorific Value， the heat value of the gas at standard conditions expressed as Net Heating Value or the actual available heat value of the gas at standard conditions

Sample gas and combustion air are metered and burned under closely controlled conditions. As the heating value of the sample gas changes， a constant exhaust temperature is maintained by precisely regulating the

combustion air to the burner (i.e.， air flow lower when heating value is higher; air flow higher when heating value is lower). These airflow variations are monitored and the intelligent pressure transmitter converts the pressure changes into the calculated output signals (4-20 mÅ and Modbus protocol) for the appropriate measurement range. Should the flame be extinguished due to a shortage of sample gas or combustion air， mechanical faiure or electrical supply failure， a solenoid valve shuts off the sample gas supply. When all required conditions are established， the sample gas supply solenoid is opened and the burner is automatically ignited.

Model 6000: NEC Class I， Div 1， Groups B， C & D - Explosion Proof， CSA approval

• Feed forward combustion control
• Mixing and blending of gas streams
• Fuel and flare gas quality monitoring
• Off-gas heating value
• LPG/air blending
• Coke oven and blast furnace
• Furnace and boiler control
• Landfill gas monitoring