德国E+H分析仪表：溶解氧传感器 Oxymax H COS21

TI244C/07/en/09.06 51505857 Technical Information Oxymax H COS21 Sensor with long-term stability for frequent sterilization and autoclaving Application • Process control in enzyme production • Control of culture growth • Biotechnological production • Food industry • General process applications Your benefits • Sensor version suitable for the pharmaceutical industry: – Stainless steel 1.4435 (AISI 316L) – Sterilizable and autoclavable • Application-specific versions: – Sensor for standard applications • Versatile usage: – Standard process connection Pg 13.5 – Installation in standard pH assemblies possible • Short response time: t98 < 60 s • Integrated temperature sensor Oxymax H COS21 2 Endress+Hauser Function and system design Measuring principle The oxygen molecules diffused through the membrane are reduced to hydroxide ions (OH-) at the cathode. Silver is oxidized to silver ions (Ag+) at the anode (this forms a silver halogenide layer). A current flows due to the electron donation at the cathode and the electron acceptance at the anode. Under constant conditions, this flow is proportional to the oxygen content of the medium. This current is converted in the transmitter and indicated on the display as an oxygen concentration in mg/l, as a saturation index in % SAT or as an oxygen partial pressure in hPa. Measuring system A complete measuring system comprises: • Oxygen sensor COS21 • Transmitter, e.g. Liquisys M COM223/253 F • Special measuring cable COK21 • Assembly, e.g. retractable assembly CPA475 a0006653 Fig. 1: Measuring system (example) 1 Oxygen sensor COS21 2 Retractable assembly CPA475 3 Special measuring cable COK21 4 Transmitter Liquisys M COM253 F Input Measured variable dissolved oxygen [mg/l / % SAT / hPa] Measuring range 0,01 to 20 mg/l (ppm) 0 to 200% SAT 1 2 3 4 CAL REL REL1 REL1 ALARM REL2 REL2E Oxymax H COS21 Endress+Hauser 3 Wiring Electrical connection The electrical connection between the sensor and the transmitter uses the multi-core special measuring cable COK21. Performance characteristics Response time From air to nitrogen at 25 °C (77 °F) • t90 : < 30 s • t98 : < 60 s Reference operating conditions Minimum flow rate 0.03 m/s (0.1 ft/s) Zero current < 0.1 % of the current at air Maximum measured error ±1 % of measured value1) Repeatability ±0.1 % of measuring range end Long-term drift Influence of medium temperature approx. 3.1% per K (compensated by transmitter) Influence of medium pressure Pressure compensation not necessary Polarization time < 60 minutes Polarization voltage –670 ± 50 mV Oxygen intrinsic consumption approx. 20 ng/h in air at 25 °C (77 °F) a0005583-en Special measuring cable COK21 PK GN / YE BN YE BU S 12 90 91 11 Assignment Terminal External shield Cathode Anode NTC temp. sensor Active internal shield (NTC temp. sensor) Reference temperature: 25 °C (77 °F) Reference pressure: 1013 hPa (15 psi) 1) In accordance with IEC 746-1 at nominal operating conditions Zero-point drift: < 0.1 % per week at 30 °C (86 °F) and under constant conditions Measuring range drift: < 0.1 % per week at 30 °C (86 °F) and under constant conditions Oxymax H COS21 4 Endress+Hauser Installation Angle of installation Environment Ambient temperature range 0 to +130 °C (32 to 270 °F) Storage temperature –10 to +60 °C (10 to 140 °F) at 95% relative air humidity, not condensing " Caution! Danger of drying out Only store the sensor with the electrode protection cap (filled with 0.02 n NaOH). Process Process temperature 0 to 130 °C (32 to 270 °F) ! Note! Please note the temperature compensation range of the transmitter used. Process pressure 0 to 4 bar (0 to 58 psi) Sterilization When autoclaving, tightly place protection cap on plug-in head. No plug-in head protection is required when the device is sterilised in-situ. ! Note! If water has penetrated the plug-in head, dry it with warm or compressed air. This will prevent corrosion or contact problems. a0006654-en Permitted installation angle 10° 10° Not permissible!Not permissible! Permissible angle of installation Oxymax H COS21 Endress+Hauser 5 Mechanical construction Design, dimensions Weight 0.2 kg (0.44 lbs) Material Process connection Thread Pg 13.5 Temperature sensor NTC 22 kΩ Electrolyte Alkaline electrolyte Ordering information Product structure a0006656 Exploded view 1 Threaded connection Pg 13.5 2, 3 Seals 4 Cathode 5 Protective cap 6 Membrane 7 Membrane cap 8 Anode 9 Plug-in head a0006655 Dimensions 1 3 4 5 6 7 8 9 2 Sensor shaft: Membrane: Electrode combination: Sealing ring: Stainless steel 1.4435 (AISI 316L) Optiflow® Silver / Platinum Viton® Immersion depth 1 120 mm (4.72 in) 2 225 mm (8.86 in) 3 350 mm (13.8 in) 5 120 mm (4.72 in) + EN10204-3.1 6 225 mm (8.86 in) + EN10204-3.1 7 350 mm (13.8 in) + EN10204-3.1 Head K Process Pg 13.5, four-pole plug-in head Application 0 Hygienic version COS21- Complete order code Oxymax W COS21 1 Oxymax W COS21 2 Oxymax W COS21 3 Oxymax W COS21 4 Oxymax W COS21 5 Oxymax W COS21 6