Technical Information COM280 Oxygen measurement Battery-driven pocket meter for dissolved oxygen measurement Application COM280 is a pocket meter for measuring dissolved oxygen. It is suitable for the following fields of application: Wastewater treatment plants Drinking and surface water Laboratory and field measurement Your benefits Comfortable operation: Clear multi-function display with user guidance Salinity compensation for sea water measurement Safe and cost-effective operation: Long service life with four commonly used 1.5 V batteries: approx. 3000 h Automatic power-down Dust and water-proof housing (IP 66) TI348C/07/en/11.08 71084901
Function and system design Measuring principle Measuring system! Note! Oxygen measurement Dissolved oxygen is determined using the amperometric principle. The oxygen molecules of the medium diffuse through the sensor membrane and are reduced to hydroxide ions (OH - ) on the gold cathode. On the plumb anode, plumb is oxidized to plumb ions (Pb ++ ). The electron release from the gold cathode and the electron acceptance at the plumb anode result in a current flow, which is proportional to the concentration of dissolved oxygen in the medium under constant conditions. The transmitter transforms the current signal into the measuring units concentration in mg/l, saturation index in % sat and partial pressure in mbar. A complete measuring system comprises: COM280 pocket meter COS280 oxygen sensor with built-in temperature sensor NTC 30, fixed cable and water-proof DIN plug Plastic bowl for sampling You can use the supplied stand as a sensor holder. 1 2 Measuring system 1 Pocket meter 2 Sensor cable 3 Sensor 4 Plastic bowl 4 3 a0008899 Input Measured variable Dissolved oxygen [mg/l,% SAT, mbar] Measuring range Measuring range I: 0 to 19.9 mg/l resp. 0 to 199 %SAT resp. 0 to 200 mbar Measuring range II: 0 to 90 mg/l resp. 0 to 600 %SAT resp. 0 to 1250 mbar 2 Endress+Hauser
Power supply Electrical connection via fixed cable and DIN plug 1 Electrical connection 1 Sensor connection a0008104 Supply voltage Battery power Service life 4 x 1.5 V alkaline-manganese batteries, type AA approx. 3000 h Performance characteristics Response time from air to nitrogen at 25 C (77 F) t 90 : 25 s Reference operating conditions Reference temperature: Reference pressure: 25 C (77 F) 1013 hpa (15 psi) Zero current < 0.1 % of the saturated value Maximum measured error Long-term drift Oxygen intrinsic consumption Electrolyte service life Temperature compensation Oxygen concentration, saturation index, partial pressure: 0.5 % of meas. value ± 1 digit Temperature: 0.1 K ± 1 digit Temperature compensation: < 2 % 3 % per month approx. 6 ng/h at 20 C (68 F) and 1 mg/l dissolved oxygen approx. 6 months 0 to 40 C (32 to 100 F) Salinity compensation selectable, fix salinity 35.0 Atmospheric pressure compensation automatic from 500 to 1100 mbar (7 to 16 psi) by built-in pressure sensor Endress+Hauser 3
Environment Storage temperature 5 to +50 C (20 to 120 F) Ingress protection IP 66 Climate class climate class 2 Electromagnetic compatibility Interference emission acc. to DIN EN 50081-1 / 50081-2 Process Process temperature 0 to 40 C (32 to 100 F) Minimum flow rate 5 cm/s (0.16 ft/s) for a measured error of 5 % Mechanical construction Design, dimensions pocket meter 80 (3.15) 38 (1.5) 80 (3.15) 172 (6.77) 38 (1.5) 35 (1.38) mm (inch) a0008904 4 Endress+Hauser
Design, dimensions case and sensor mm (inch) 355 (14.0) 115 (4.53) 18 (0.71) 22 (0.87) 305 (12.0) 188 (7.40) 145 (5.71) mm (inch) 15 (0.59) Case dimensions a0008909 Sensor dimensions a0008907 Weight Pocket meter Sensor Case, total weight 0.4 kg (0.9 lbs) 0.2 kg (0.4 lbs) 2.3 kg (5.1 lbs) Materials Pocket meter Housing: polypropylen (PP) Keypad: silicone Sensor Shaft: POM, stainless steel 1.4571 (AISI 316Ti) Human interface Display elements 1 2 3 1 2 3 4 5 Measured value Status display Sensor symbol Temperature Displayed functions 5 4 mbar Displayed functions LoBat Low battery TP Symbol of the temperature display Cal Calibration function ARng Autorange function on AR Autorange function off LC display a0008485 Endress+Hauser 5
Operating elements M CAL I AR M I CAL AR RUN/ ENTER Operation mode On/off Calibrate Autoread on/off (Hold function) Run/Enter RUN/ENTER Keypad a0008490 Ordering information Order number Scope of delivery Oxygen pocket meter COM280 order no. 51510540 The measuring set comprises: 1 COM280 pocket meter 1 membrane-covered oxygen sensor COS280 with built-in NTC 30 temperature sensor, calibration and storing vessel and protection guard, 3 m (9.8 ft) fixed cable and water-proof DIN plug 1 plastic bottle with alkaline electrolyte solution, 50 ml (1.7 fl.oz) 1 plastic bottle with cleaning solution, 50 ml (1.7 fl.oz) 1 spare membrane 1 polishing sheet 1 plastic bowl 50 ml (1.7 fl.oz) 1 stand used as electrode holder 4 alkali-manganese batteries 1.5 V 1 solid plastic case made from PP with integrated measuring point and separate pocket for sensor and accessories 1 Operating Instructions BA348C/07/b4 Accessories and spare parts Sensor COS280 order no. 51511013 Membrane caps COY280-WP 3 pcs. order no. 51511015 Electrolyte and cleaner set COY381-FRL order no. 50081036 Polishing sheet COY31-PF order no. 51506973 6 Endress+Hauser
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Instruments International Endress+Hauser Instruments International AG Kaegenstrasse 2 4153 Reinach Switzerland Tel.+41 61 715 81 00 Fax+41 61 715 25 00 www.endress.com info@ii.endress.com TI348C/07/en/11.08 71084901 Printed in Germany / FM+SGML 6.0 / DT