Total Combustibles Analyser

Based on catalytic combustion system, the 8867 provides accurate in line analysis of flue gas and other gases with Oxygen deficiency in order to determine the total concentration of combustible gases in the sample stream (typically expressed as CO, CH4 or H2 in accordance to the most representative component).

 The air dilution port, combined with the ADEV special dilution system can ensure a perfect measure even in case of Oxygen deficiency (that is the most dangerous condition).

 Fully proved technology, widely used in Iron & Steel plants and petrochemical plants.

Measureable Gas


Main Features

Extreme Roughness

  • No inner moving parts
  • Wet parts in AISI316 and glass
  • Resistant to the most severe industrial environments


High Performances

  • Possibility to measure the combustibles also in condition of Oxygen deficiency thanks to the special ADEV dilution system
  • Sensing unit temperature controlled
  • Insensitive to ambient temperature variations
  • Installation position and vibration don’t alter the accuracy and stability of the measure


Easy Maintenance

  • Modular construction
  • Fast access to the inner PCB just unscrewing the housing cap
  • Possibility to remove the entire sensing unit from the housing just by unscrewing 2 screws and leaving her housing connected to the sampling system.


European Compliance

  • Low Voltage Directive 2014/35/EU
  • EMC Directive 2014/30/EU
  • Directive ATEX 2014/34/EU (optional)



ATEX certification for Zone 1 / Zone 21 with protection mode:

II 2 G D     Ex db IIC T6 Gb

                  Ex tb IIIC T85°C Db



ATEX Certificate Number CESI 03 ATEX 130


Accuracy± 4% of span (output signal).
Repeatability± 0.5% of span (short term).
Reproducibility24 hours: ± 1% of span.
LinearityBetter than ± 1% of full scale
Response TimeInitial: < 1 sec.; 90% of step-change: < 10 sec. (with max. 2000 cc/min. flow rate)
DriftZero: max. ± 2% of span per week
Span: max ± 1% of span per week (without autocal)
Ambient Temp. InfluenceBetter than ± 1% of full scale on the entire temperature range
Atm. Pressure Influence± 0.015% of reading per hPa
Flow Rate InfluenceThe ratio between dilution air flow rate and sample flow rate must be constant
Line Voltage Influencemax. 0.02% of span, for each 1% change of voltage.
Sample Flow Ratewith 0-5% range: 1000 cc/min
with 0-10% range: 500 cc/min.
Dilution Air Flow Ratewith 0-5% range: 1000 cc/min
with 0-10% range: 1500 cc/min.
Sample Pressure3000 Pa minimum (with filter and flow meter).
RangeRefer to ordering information
Outputnon-normalized output current that functions as input of the selected ADEV control unit
Relative Humidity90% maximum.
Operation Temperature-10 ÷ +50°C (14 to 122 °F).
Temperature controlledat 50°C
Storage Temperature+70°C (158 °F) max.
Power Requirements24 ÷ 30 Vdc, 45 VA from dedicated power supplier.
Pneumatic Connections¼” or 6 mm OD tubing (compression fittings supplied)
Wiring ConnectionsGeneral purpose: 2 openings for G 3/8" (PG 13 cable grip). Ex-Proof: 2 openings for GK 1/2" (cable grip or conduit).


 Iron & Steel Plants

Petrochemical Plants

Combustibles monitoring in every type of furnace, oven and tank

Sampling System

8867 needs an external sampling system able to deliver an almost clean sample gas to the analyser at the proper temperature, pressure and flow rate.

 ADEV can provide the 8867 analyser combined with a very specific sample and condition system designed to have an Air / sample gas mixture severely guaranteed as constant and, consequently, to get the measure even in case of Oxygen deficiency in the sample (condition that is often linked to an high presence of combustibles). Contact ADEV for details

Measuring Principle 

The measurement is based on a Wheatstone bridge unbalance resulting from the heat produced from oxidation of the measured gases by catalytic combustion. A flow of dilution air is provided together with the process gas through the sensing unit.

 The combustion takes place on the catalytically coated measuring filament (the active arm of the bridge). The other active arm is identical to the first one but without catalytic properties. Both the arms are identically influenced by flow rate, pressure, temperature and background variations.