7873
Zirconia Flue Gas Analyser
Self-heated probe, designed to measure Oxygen in flue gas (up to 700°C). Designed to measure Oxygen in flue gas for combustion efficiency and fuel saving in big boilers and power plants fed by Natural Gas, light and heavy oils, LPG, Biomass and Coal.
Available as a transmitter with 4-20 mA output from the probe head or combined with a control unit / display.
Measureable Gas
Oxygen [O2]
Main Features
Extreme Roughness
- Rugged materials contacting the process gas
- Usable in flue gas up to 700°C, either continuously or cyclically
- Do not suffer damage or deformation
- Installation and protection tube makes the probe suitable for high dust flue gas, avoiding abrasion and sticking of dirty material.
- Different types of filter mesh and deflector plate to put against gas flow to limit the dust impact on the sensor:
Ceramic fiber mesh: Suitable for non-sticking dust and moderate flow rate applications
Ceramic mesh: Suitable for high dust, sticking particulate and high flow rate that may generate abrasive effect
Metallic Stainless Steel sintered filter: suitable for highly abrasive dusts and high flow rates inside the stack
No Critical Parts
- Potentially critical solutions have been avoided such as internal welds, critical couplings and separation of the reference atmospheres from the measurement atmospheres:
Easy to Use and Service
- Direct insertion into the smokestack or duct
- Possibility to check the calibration without removing the probe from process
- All components parts easily accessible and field serviceable.
Sensor assembly replaceable without removal of the probe from its mounting.
European Compliance
- Low Voltage Directive 2014/35/EU
- EMC Directive 2014/30/EU
Specification
| Probe | |
|---|---|
| Accuracy | 0.1% O2 below 5% or 2% of reading above 5% |
| Repeatability | ± 1% of reading (short term) |
| Output Resolution | 0.01% O2 |
| Response Time | Sensor: 0.1 sec. ; Overall system < 5 sec. |
| Flue Gas Temperature | up to 700°C (on request up to 800°C) |
| Insertion Length | 300 / 450 / 1000 / 1500 / 2000 mm |
| Process Connection | Flange type |
| Ambient Temp. Influence | Probe: max ± 0.005% of reading per °C. External head: max. 0.06% of reading per °C |
| Atm. Pressure Influence | 1% of reading per 1% change in ambient pressure. |
| Probe Head Protection | IP65 |
| Head Temperature | -5°C…+55°C |
| Weight | Probe 300/450 mm: 9 Kg. ; Probe 1000 mm: 10 Kg.; Probe 1500 mm: 11 Kg. ; Probe 2000 mm: 13 Kg. |
| Wiring Connections | N°2 cable glands for cables max. 10 mm and inner terminal strip |
| Pneumatic Connections | Calibration inlet: 1/8” NPT-F |
| Measuring Principle | Zirconium Oxide (Zirconia). Micro-pod sensor technology with no need of reference air |
| Humidity | 0….90% non-condensing |
| Analog Output | 1 x 4-20 mA linear output proportional to range; max. load 500 Ω (or 350 Ω with galvanically insulated module) or logarithmic 50 mV/decade * |
| Ranges | 0-5 / 0-10 / 0-25% O2 (to select at order) |
| Diagnostic NV Logical Output (non-valid) | Logical Non Valid output from relay free contact. Normally supplied in fail safe condition (triggered relay and closed contact if not in alarm). Can be modified in filed |
| Power Supply | 117 VAC ± 10%, 50/60 Hz, 350 VA |
| *Output from probe when connected to a remote ADEV control unit | |
| Control Unit | |
| ADV222 specifications (common to all versions) | |
| Analog Inputs | 2 x isolated |
| Analog Outputs | 2 x isolated |
| Output Resolution | better than 1x10.000 of FS |
| Relays | N°2 relays SPDT, 230 VAC, nominal 2A (max 4A) ** |
| Power Supply | 8...28 VDC ; 9...24 VAC |
| Ranges | 0-25% O2 *** |
| Operative Temperature | -20°C…+70°C |
| Humidity | 0….90% non-condensing |
| Led | Power supply (blue) - Cumulative inputs overload (red) - TX/RX (yellow/amber) |
| Serial Interface | RS485 2-wire (Protocol ModBus-RTU) |
| Line Impedance | 120 ohm |
| Termination Type | External |
| Max Speed | 57600bps |
| Max No. of Nodes | 32 |
| Protection | IP20 |
| Weight | 900 gr. |
| Connections | Removable screw terminals pace 5,08 mm |
| Conductor Section | Max. 2,5 mmq |
| Mounting | DIN rail |
| ***Threshold to be selected at order (factory set) or settable in field by PC with ADEV Easy Configurator or by display if ADbox or ADcaseM are selected | |
| ****Default range factory set. Modifiable on request at order on customer specification or by PC with ADEV Easy Configurator | |
| Supplementary ADbox Specification | |
| Protection | IP55 |
| Weight | 8 Kg. |
| Dimensions | 400 x 300 x 150 mm |
| Display | LCD 2.42” OLED. Resolution0.01% |
| Cable Entrance (bottom) | N°4 cable glands PG 13 / 9 / 7 |
| Supplementary ADcaseM Specification | |
| Protection | IP55 |
| Weight | 10 Kg. |
| Dimensions | 400 x 300 x 150 mm |
| 500 x 400 x 250 mm (with transformer) | |
| Display | LCD 2.42” OLED. Resolution0.01% |
| Cable Entrance (bottom) | N°4 cable glands PG 13 / 9 / 7 |
| Pneumatic Connections | Calibration air inlets: 1/8” NPT-F |
| Configurations | ADcaseM-1: Pressure reducer and manual valve |
| ADcaseM-2: Pressure reducer and electro valve |
Applications
Industrial boilers using any type of fuel: Natural gas, LPG, light oils, heavy oils, diesel, coal, biomass
Utility Boilers
Recovery Boilers
Low Temperature Incinerators
Power Plants
Cement Kilns
Industrial Furnaces
Other combustion processes where flue gas is within temperatures limits (within 700°C)
Measuring Principle
The measuring principle on which the analysis is based is linked to the use of Zirconium oxide which, at high temperatures, can behave like a solid state electrolyte, developing an electromotive force on two electrodes placed in contact with different O2 concentrations (partial pressures), proportional to the temperature in Kelvin degrees (°K) and the logarithm of the ratio between the two pressures PO2’ and PO2” in accordance with Nernst’s well-know ratio:
E = RT / nF (Lg P02’ / P02“)
Where: R = Perfect gas constant (8,31 Joule/degree bulk)
F = Faraday’s constant
T = Absolute temperature in °Kelvin
n = 4
The inner sensing element is a based on a proprietary ADEV technology (micro-pod) and features a solid state reference that completely eliminate the need of a reference air flow, making the instrument very easy and practical to use in field.
- No reference air
- Sensor on the tip
- No gas circulation