8869
Infrared Multi-Gas Analyser
8869 is a rugged process analyser for measuring up to 3 IR-absorbing gases in heavy duty applications in safe area and hazardous area with the best ATEX protection mode (Zone 1 / 21).
Designed to withstand the most severe process conditions, this resilient analyser have no choppers or other moving parts that may affect the reliability.
Measureable Gas
Acetylene [C2H2]
Carbon Monoxide [CO]
Ethylene Oxide (ETO) [C2H4O]
Nitric Oxide [NO]
Styrene [C8H8]
Vinyl Chloride (VCM) [C2H3Cl]
Ammonia [NH3]
Ethanol [C2H6O]
Hydrogen Chloride [HCl]
Nitrous Oxide [N2O]
Sulfur Dioxide [SO2]
Water [H2O]
Carbon Dioxide [CO2]
Ethylene [C2H4]
Methane [CH4]
Propane [C3H6]
Toluene [C7H8]
Xylene [C8H10]
Main Features
Extreme Roughness
- No choppers and other moving parts
- Wet parts in selected materials for use with gas like pure Ammonia, VCM, HCl and other demanding streams
- Resistant to the most severe industrial environments
High Performances
- Designed to measure up to 3 IR-absorbing gases with a unique sensing unit
- Precision optical filters minimize effects of background gases
- Single beam source and no gas-filled cells
- A unique source-emission control system allows up to 20% windows fouling without effect on accuracy.
- Sensing unit temperature controlled
- Insensitive to ambient temperature variations
Easy Maintenance
- The sensing unit can be easily disassembled for field maintenance and cleaning.
- Modular construction
- Fast access to the inner PCB just unscrewing the housing cap
European Compliance
- Low Voltage Directive 2014/35/EU
- EMC Directive 2014/30/EU
- Directive ATEX 2014/34/EU (optional)
ATEX
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
IP65
ATEX Certificate Number CESI 03 ATEX 130
Specification
| Performance | |
|---|---|
| Accuracy | ± 1% of span (output signal). |
| Further improvable with autocalibration. | |
| Repeatability | ± 0.3% of span (short term). |
| Reproducibility | 24 hours: ± 1% of span. |
| Linearity | with control unit: better than ± 0.5% of full scale |
| Response Time | Initial: less than 1 sec.; 90% of step-change: 6 sec. |
| (with max. 1000 cc/min. flow rate) | |
| Drift (without autocalibration) | Zero: max. ± 1% of span per week |
| Span: max ± 1% of span per week | |
| Ambient Temp. Influence | ± 0.05% O2 per °C |
| Atm. Pressure Influence | ± 0.1 ÷ 0.18 % of reading per hPa |
| Flow Rate Influence | < 0.5% of span over flow variation from 250 to 2000 cc/min. |
| Line Voltage Influence | max. 0.02% of span, for each 1% change of power voltage. |
| Gas Interference | Depending of gas. Typically less than 2% of span |
| Operative | |
| Sample Requirements | Flow Rate: 250 ÷ 2000 cc/min. |
| Pressure: min. 3000 Pa (with filter & flow meter). | |
| Output | non-normalized output current that functions as input of the selected ADEV control unit |
| Relative Humidity | 90% maximum. |
| Operation Temperature | -10 ÷ +50°C (14 to 122 °F). |
| Temperature controlled | at 65°C (or higher depending on the application) |
| Storage Temperature | +70°C (158 °F) max. |
| Power Requirements | 24 ÷ 30 Vdc, 45 VA from dedicated power supplier. |
| Pneumatic Connections | ¼” or 6 mm OD tubing (compression fittings) |
| Wiring Connections | 2 openings for GK 1/2" (cable grip or conduit). |
Applications
Heat treatments (furnace atmosphere, carburizing, nitriding)
Iron and steel industry
Blast furnaces and combustion processes
Sulphur Production
Biogas & Landfill Gas
Gas production industry (gas purity)
Copper melting furnaces
Water measurement in high concentration and at high temperature
ETO sterilizing processes
In general, selective measurement of any gas with infrared absorption spectrum
Sampling System
The 8869 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 has a wide experience in process and can provide the 8863 analyser combined with a sample and condition system designed for the specific application requirements. Contact ADEV for details.
Measuring Principle
The heart of the model 8869 Infrared Analyser is the cell assembly, which consists of:
- 2 helically-wound Nichrome wires which provide the I.R. source
- 1 temperature-controlled sample cell in which the sample circulates
- 1 detector assembly with: one measuring detector with an interference filter focused on the selected IR absorption band for the gas to be analysed; and one reference detector with an interference filter with a band able to compensate ageing effects, dirty built-up on the optical path and background gas variations.
A very particular innovative technique allows a perfect system balance that eliminates drifts and the automatic restore of the sensitivity by controlling the energy that reaches the detector.
This design can be expanded up to 3 gas variables.