OxyTrend
Electrochemical Oxygen Transmitter
OxyTrend is an Oxygen analyzer based on electrochemical sensor. It can be configured as a 2-wire loop powered transmitter or, connecting further 2 or 3 wires, it can also have serial output RS485 ModBus RTU (in alternative or in addition to the analog 4-20 mA).
OxyTrend can integrate 9 alternative types of sensor, depending on the measure to be achieved (from low traces, up to 100%). All sensors are insensitive to the presence of many background gases and hydrocarbons, making this instrument suitable for a variety of applications.
Simple, reliable and cost-effective solution to measure O2 in extractive applications in safe and hazardous area (ATEX) Zone 1 / Zone 21
Leírás
Measurable Gas
Oxygen [O2]
Main Features
High Performances
- Two-wire, loop powered 4-20 mA transmitter
- Four or five-wire connection in case of use of the RS485 serial interface or 4-20 mA + RS485 respectively
- ModBus RTU Master or Slave selectable by menu
- Connectable with the ADEV 8RO4DI external module by RS485 to have 8 relays output and 4 digital inputs
- Unique hardware for all wiring connection types
- Optical through-the-glass buttons allowing menu operation without opening the housing
- Graphical LCD Display with visualization in Auto-Range and possibility to switch to trend visualization
- Use friendly menu and intuitive interface
- High Accuracy Galvanic Sensors
- Microprocessor-based technology and inner routine of electronic zero autocalibration
- User selectable range
- The version for hazardous area application is Ex-Proof and doesn’t require any Zener barrier in non-hazardous location
- Low Maintenance
- Sensor lifetime indication
- NAMUR error indication
9 Different sensors
| TYPE | CODE | Application |
| Trace (PPM) | A59014 | 0-10 ppm low range, used in most industrial applications |
| Trace (PPM) | A59013 | 0-10 ppm low range, used when acid gases are present (CO2 > 0.1%, etc.) |
| Trace (PPM) | A59002 | Optimized for extra low traces, 0-1 ppm low range |
| Trace (PPM) | A59003 | Optimized for extra low traces, 0-1 ppm low range when acid gases are present (CO2 > 0.1%, etc.) |
| Percent | A59021 | General purpose O2 Measurement. LDL 1000 ppm, used mainly for long life percent applications |
| Percent | A59022 | General purpose O2 Measurement. LDL 1000 ppm, used when acid gases are present (CO2 > 0.1%, etc.) |
| Hybrid | A59023 | For measuring 20 ppm to 25% with regular exposure to ambient air |
| Purity | A59025 | Designed for measuring elevated O2 (21.0% – 100%) |
| Trace (PPM) | A59031 | 0-1 ppm extra low range, optimized for Natural gas applications (stream with H2S up to 500 ppm) |
European Compliance
- Low Voltage Directive 2014/35/EU
- EMC Directive 2014/30/EU
- Directive ATEX 2014/34/EU
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 20 ATEX [Pending]
Specification
| Performance | |
|---|---|
| Range | 1 ppm ÷ 100% FS (user settable) |
| Accuracy | ± 1% of FS (at constant conditions) |
| Repeatability | ± 1% of FS (at constant conditions) |
| Linearity | ± 1% of FS (at constant conditions) |
| Resolution | 0.005 ppm on 0-10 ppm range 0.01 ppm or percent on other ranges |
| Compensation | Integrated (temperature) |
| Sample Flow-rate | General purpose: 500-1000 cc/min. ATEX: recommended 500 cc/min. |
| Pressure | Vent to atmosphere |
| Atmospheric pressure effect | ± 0.1% of reading per mbar |
| Cell life | 17 ÷ 24 months at 25°C, 1 atm. |
| Response Time | 90% of final FS reading: < 10 sec. |
| Recovery time (only for cells for ppm) |
If a cell is exposed for 60 sec. in Air, 1 hour of N2 purging it is necessary to go back again < 10 ppm O2 |
| Display | Backlit graphic LCD display with visualization in auto-range |
| Operative | |
| Output: | Loop 4-20 mA (two-wires) RS485 ModBus RTU (four-wires) Loop 4-20 mA + RS485 (five-wires) |
| Relays and Digital Inputs | 8 relays + 4 digital inputs (only combined with ADEV 8RO4DI external module) |
| Operative Temperature | 0 ÷ +50°C |
| Protection | IP65 |
| Relative Humidity: | 90% max. |
| Power Requirements | 16,5 ÷ 30 VDC; max current: 23 mA |
| Max. Load Resistance (RL) | Depends on applied voltage |
| Wiring Connections | N°2 threaded holed 1/2” NPT-F |
| Pneumatic Connections | Standard: 1/8” NPT-F Optional: 1/8” or 1/4” or 6 mm compression tube fittings in AISI 316 Available KF40 connection (only safe area) |
| Weight: | about 0,8 kg |
Applications
Trace O2 in pure gases
Natural Gas & Biogas
Glove box purge and leak detection
Annealing furnaces
Air separators
Nitrogen & Hydrogen generators
Pure gaseous hydrocarbons streams
Chemical & Petrochemical
Steel & Metal processing
Reducing processes
Welding gases
Inerting control
Semiconductor wafer machines
Heat treatments
Sampling System
OxyTrend 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 EC9600 transmitter combined with a sample and condition system designed for the specific application requirements. Contact us for details.
Measuring Principle
ADEV sensors are specific for Oxygen. They measure the partial pressure of Oxygen from low ppm to 100% levels in inert gases, gaseous Hydrocarbons, Helium, Hydrogen, mixed gases, acid gas streams and ambient air.
Oxygen, the fuel for this electrochemical transducer, diffusing into the sensor reacts chemically at the sensing electrode to produce an electrical current output proportional to the Oxygen concentration in the gas phase. The sensor’s signal output is linear over all ranges and remains virtually constant over its useful life.
