4283 Dissolved Oxygen

Transcription

1 4283 Dissolved Oxygen Measuring range Dissolved oxygen 0 to 20.0 ppm or mg/l - 0 to 200% SAT Resolution 0.1 ppm or mg/l - 1% SAT Dual parameter versions available [ph/redox - Dissolved oxygen] [Turbidity - Dissolved oxygen] [Suspended solids - Dissolved oxygen] [Dissolved oxygen - Dissolved oxygen] with S423/C/OPT optical sensor only S423/OXYSENS Main measuring range The oxygen contained in the liquids is measured using the so-called Clark cell system. These cells generate a current proportional to the partial pressure of the oxygen, which can be detected using a suitable signal converter. In order to prevent interference during measuring, the Clark cell is protected by a gas-permeable membrane. The membranes typically used are made from PTFE but, as this material is mechanically fragile, frequent changing is often necessary, along with the related demanding operations (interruption of measurement, replacement of the electrolyte, regeneration of the electrodes). The S423 solves this problem by using a membrane made from OPTIFLOW. Manufactured as a sheet around a layer of steel, it is very stable mechanically and very resistant to chemically aggressive environments as well as high pressure. Thanks to the special construction of the measuring electrodes, this system also makes the sensor totally maintenance free. Maintenance OXYSENS sensors are maintenance-free, and do not require the replacement of the membrane, electrolyte or regeneration of the electrodes, to measure the oxygen in aqueous samples. Typical applications include water treatment plants and the fish industry. Technical data Electrode material Electrolyte Membrane Temperature sensor Polarisation current Sensitivity Stabilisation time Silver-platinum combination Alkaline solution OPTIFLOW NTC 22 kohm /- 50 mv Operating temperature C Storage temperature Pressure Outer diameter Connection na at 25 C in air typical 15 min., max. 1 h C, with water inside the protective cap bar during insertion; max. 0.5 bar in total during submersion 12 mm PG 13.5 threaded Construction materials Regeneration Response time t 98% Temperature response Measuring liquid speed stainless steel, PEEK, silicone, NBR not required max. 60 s at 25 C, from air to nitrogen approx. 3.1%/K min m/s Influence of flow rate < 5% at 25 C Oxygen consumption approx. 20 ng/h in air at 25 C Residual current Zero drift Sensitivity drift < 0.5% current in air < 0.5% current in air every 2 months at 25 C or in water in stable conditions < 10% every 2 months at 25 C in water in stable conditions

2 S432/C/OPT Oxygen and temperature sensor with OPTICAL technology 4Optical technology: no membrane or electrolyte 4No signal drift: no calibration 4Digital output: Modbus RS-485 4Sturdy stainless steel structure Fields of application Biological purification systems (aeration, nitrification/denitrification tanks etc.) Industrial water treatment plants Monitoring surface water Aquaculture Water conditioning Optical technology The S432/C/OPT sensor measures oxygen with a built-in temperature probe. The measuring technique is based on the optical principle: a diode emits a light blue towards a support on which a fluorescent substrate is applied. The substrate initially reacts by emitting a red light (luminescence), then returns to its initial state. The intensity of the red light produced and the rate of return to the initial state are related to the concentration of oxygen present. This innovative method ensures reliable, accurate measurements with no drift over time, therefore system calibration is no longer necessary. No maintenance is required except for replacing the luminescent support about every two years. The system does not consume oxygen, therefore it is suitable for the most varied fields of application, including those in which the measuring liquid is almost stationary. Digital technology Built-in pre-amplification circuit and digital signal processing. The S432/C/OPT sensor saves the calibration data for optimal data management. The output signal is provided on the RS 485 serial port. Physical characteristics Compact, sturdy and lightweight, the stainless steel body enables fixed or portable applications. Technical data Measuring principle Optical by means of luminescence Measuring ranges 0,00 20,00ppm / % Sat 0 50 C Resolution 0,01 ppm Precision +/-0,1ppm / +/-1 % Temperature compensation via NTC Response time 90% of the actual value in less than 60 seconds Liquid stirring speed Not required Digital interface RS-485 Modbus Maximum refresh time < 1 second Membrane Electrodes Electrolyte Dimensions Weight Materials in contact with the liquid Maximum operating pressure Protection rating Interchangeable sensor cap Typical duration 2 years. No electrode No electrolyte Diameter: 34 mm Length: 180 mm Fitting: 3/4" male 850 g (sensor + 10 m cable) Stainless steel 316L/PVC 5 bar IP68 Storage temperature C

3 42 series The 42 series developed by Chemitec is dedicated to the water treatment and industry sectors, and enables the following parameters to be measured: 4pH/REDOX 4Dissolved oxygen 4Conductivity 4Turbidity 4Suspended solids 4Chlorine 4Chlorine dioxide 4Ozone Process control device Display 4Simultaneous measurement (numerical and bar graph) and temperature values. 4Scrolling output values. 4Graphic icons for: status of digital outputs, washing cycle, data recording, alarms. 4Possibility to display the measurement only in large format. Data recording 44-bit internal flash memory (about 16,000 records). 4Recording interval: 1 to 99 min. 4Type: Circular (F.I.F.O.) or filling. 4Ability to view the logged data in table or graphic form, with indication of the maximum, minimum and average values in the selected periods. Wall-mounted version with IP66 protection rating (144 x 144 x 120 mm) PID control 4P - PI - PID functions activated on the analogue or digital output. 4Proportional range: 0 to 500%. 4Integral time: 0:00 to 5:00 min. 4Derivative time: 0:00 to 5:00 min. Panel-mounted version (144 x 144 x 100 mm) 2 analogue outputs 4Output 1 programmable for measurement. 4Output 2 programmable for measurement / temperature / PID control. 4 The limits of the outputs are freely programmable within the measuring range. 4 digital outputs 4ON/OFF set point: Programming the operating range (hysteresis/direction) and start/stop time 000 to 999 seconds. 4PID control: Pulses, frequency or PWM (2 set points).

4 Alarm 4Programmable for: tool faults, minimum, maximum, set point delay, stay time (live check). 4Delay time: 00:00 to 59:59 mm:ss with minimum interval of 15 sec. 4Stay time 00:00 to 99:59 hh:mm 4Set point deactivation (in case of alarm): Enabling/Disabling. Washing electrodes 4Programming the interval (minimum 15 min) and the duration. 4During washing, all the analogue and digital outputs are frozen. Digital input 4To disable the doses. RS485 serial port 4For set-up and remote real time acquisition or for downloading data (using dedicated software). 4 MODBUS RTU communication protocol. USB port 4USB for direct download on PEN DRIVE (optional). Manual controls 4Possibility to simulate the analogue and digital outputs from the keypad. Temperature compensation 4Using PT100 sensor with 3 or 4 wires, or PT Electrical connections Measure Temperature Vac/dc Serial Port RS485 1st Channel Serial Port RS485 2nd Channel USB port Temperature VAC-VDC input Digital input Digital Power Supply Vac 4 5 CPU 9 Output 4 20 ma 1st Channel Output 4 20 ma 2nd Channel Universal power supply VAC Ground Keypad and graphic display Ground 6 Relay 1 Setpoint Output Keypad Graphic display 7 10 Relay 2 Setpoint Relay Alarm/Temp1 Relay Alarm/Temp2 8 9 RS485 serial port and USB Current outputs 10 Digital outputs Set Point 1 Set Point 2 Alarm /Temp 1 Washing / Temp 2

5 Simple and intuitive software 4Interactive, easy to read interface 4Main menu with graphic icons Display of stored data in graphical form, even during RUN TIME measurement MODBUS RTU serial interface for: 4Communication of data in real time 4Downloading the data stored on PC via SW or directly on the removable USB pen drive (optional)

6 Dimensioni Wall-mounted version with IP66 protection rating , Ø x pg x pg Panel-mounted version 144 x 144 Panel-mounted version 96 x Paab Tekno Trading AB - Tingvallastrand 12, Säffle, Sweden Tel: Fax info@paab.com -