Description
The VisiTrace mA and RS485 probes are designed to measure dissolved oxygen in the low concentration range, particularly in brewing applications, including during filtration and filling. The advantages of these optical dissolved oxygen sensors are fast response time and low maintenance. Improvements over conventional electrochemical (amperometric) sensors include flow independence, fast start-up with no polarization time, and simplified maintenance. Monitoring in low ppb ranges is essential in many applications such as brewing processes and power plants. VisiTrace mA features HART and wireless communication via Bluetooth directly from the sensor to your computer, simplifying calibration, configuration and maintenance. VisiTrace RS485 requires an Arc Wi adapter for wireless communication.
This dissolved oxygen sensor is also for measurements in boiler water where there is a high level of chloride, the effect of oxygen corrosion is increased. VisiTrace mA is ATEX and IECEx approved.
This type of probe can also be used in biotechnology to measure the O2 concentration in bioreactors (different measurement ranges are available).
Features
- Sensor output: 4 to 20 mA / HART
- Lengths available: 120 mm, 225, 325 and 425 mm
- Electrical connector: M12
- Measuring principle: Oxygen-dependent luminescence quenching, temperature compensation
- Measuring range: 0 to 2 ppm (0 to 50 mbar) O2, 0-5 % vol at 25 °C and 1 bar pressure
- Accuracy at 25°C: ±0.5 ppb or 2% whichever is greater
- Drift at room temperature: < 1% per week at 100 ppb
- Oxygen consumption: None
- NTC temperature sensor 22 kOhm
- Configurable values DO: mbar; %-sat; %-flight ; µg/l; mg/l; ppb/ppm (gas); ppb/ppm (dissolved oxygen); Temperature: °C, °F, K
- Diameter: 12mm
- Connection to the PG13.5 process
- Wetted parts: Stainless steel 1.4435, EPDM (ethylene-propylene elastomer), Silicone-FDA 21 CFR 177.2600
- VMQ (silicone elastomer)
- Steel surface quality Ra < 0.4 µm (N5)
- Current range 4 to 20 mA (3.5 to 22 mA)
- Analog interface 1 two-wire heatsink 4 to 20 mA for DO, programmable
- Accuracy 4 to 20 mA < 0.3% + 0.05 mA
- Max transmission power 4 dBm
- Bluetooth 5.0 digital interface
- HART version 7.0
- Operating voltage 18 to 30 VDC
- Response time t90% < 20 s in gas; < 90 s in water
- ATEX approval ll 1 G Ex ia llC T3/T4/T5/T6 Ga; II 1 D Ex ia IIIC T135°C Da
- Approval IECEx ll 1 G Ex ia llC T3/T4/T5/T6 Ga; II 1 D Ex ia IIIC T135°C Da
- Autoclavable Yes
- CIP Yes
- Steam sterilizable Yes, max. Temperature 140°C
- Operating temperature range -10 to 140°C; sensor provides no DO reading above 85°C
- Pressure range bar g -1 to 12 bar
- Protection index IP 68
