ARGES Fluorescent Dissolved Oxygen Sensor
The Intelligent Submersible Dissolved Oxygen Sensor By Keynes Controls, is a high performance submersible sensor that has been designed to simplify the acquisition of water quality measurement parameters into any platform that supports data logging operations using digital network communications.
Each of the Intelligent Submersible Dissolved Oxygen Sensor by Keynes Controls is suitable for direct connection to industry standard SDI12 Data Recorder, RS485 and MODBUS networks. The instruments can communicate directly across a MODBUS network and can be integrated into plant wide SCADA applications and to to many 3rd party PLC controllers.
Fluorescence
The ARGES Dissolved Oxygen sensor used fluorescent technique to determine the level of dissolved oxygen in water. The sensor has a long life time and does not require any reagents for its operation.
Measurement Integrity
All of the ARGEs sensor range have the serial numbers and the last calibration date stored internally. The user can access this information for reporting purposes. The sensors can be redeployed at any time with the calibration and serial number records are retained in the sensor.
Product Features
| TYPE | Solid state Fluorescence sensor. |
| RANGE (Typical levels) | Auto range scales: 0.00 - 10.0 mg/l ppm Deg C |
| Measurement range: | 0 - 10 mg/L - 0 to 100% DO |
| Construction | ABS / Stainless Steel Body - Gold Plated Network Connection |
| Resolution | 0.01 mg/L ppm |
| Construction |
Stainless steel PCV wet mate connectors |
| Sensor life: | Approximately 1 Year, depending on usage. |
| Sensor Element | Fluorescence |
| Low Power | Low self heating |
| Built-in Network Communications Options |
MODBUS - SDI12 - RS485 - Analogue 0-2 V DC Optional |
| Chemical-free no electrolyte handling |
Calibration Summary
The Intelligent Submersible Dissolved Oxygen Sensor By Keynes Controls can be used within SONDE multi-parameter housing, or as a stand-alone sensor. The Dissolved Oxygen sensor should be calibrated before use for optimum results.
The sensors are shipped pre-calibrated and are ready for direct deployment.
The ARGES Dissolved Oxygen sensor is typically calibrated at 2 points. A Zero point which uses the 0% dissolved oxygen water, and the 100 % saturation as set by the 100% air saturated water. The overall accuracy of the sensor will depend upon how well the ARGES Dissolved Oxygen sensor has calibrated.
Storage and Handling
Storage temperature range : 2 - 60 Degrees Celsius.
Further Information
The Submersible Dissolved Oxygen Sensor by Keynes Controls monitors dissolved oxygen levels in water. The ARGES Dissolved Oxygen Sensor readings are influenced by temperature and salinity variations. For comprehensive insights into oxygen levels in a water source, it is recommended to deploy this sensor alongside other intelligent sensors.
Fresh Water Dissolved Oxygen Levels
- At 20°C (68°F), freshwater can hold approximately 9.1 mg/L of dissolved oxygen.
- At 10°C (50°F), this value decreases to around 7.6 mg/L
Salt Water Dissolved Oxygen Levels
- At 20°C (68°F), seawater can hold approximately 7.2 mg/L of dissolved oxygen.
- At 10°C (50°F), this value decreases to around 6.1 mg/L
As is shown when the salinity increases, the solubility of oxygen decreases
Barometric Pressure
The atmospheric pressure affects the partial pressure of oxygen in the air above a water surface.
The higher the atmospheric pressure then the greater saturation concentration of dissolved oxygen it the water, also
lower the atmospheric pressure then reduction in the dissolved oxygen levels can occur.
Keynes Controls manufacture intelligent barometers that can be used with the ARGES range of sensors. The Barom-485 and Barom-SDI12 barometers can be connected to the same Data Recorder or SCADA system as the chemical sensors and are fully supported in the free issue Q-LOG software.
Application Uses
- Agriculture.
- Brewing and Beverage Manufacture.
- Boiler Feed Water
- Pharmaceutical
- Water Purification
- Power Plants
- Plant Effluent Monitoring
- Water Treatment - Fish Farming and Environmental Monitoring
Product Specifications
| DISSOLVED OXYGEN | ENVIRONMENTAL CHARACTERISTICS | |||
| Range | 0 - 20 mg/L / 0-100% | |||
| Resolution | 0.01 mg/L | |||
| Accuracy | ± 0.3 mg/L | Water Temperature: 0 to 60 °C | ||
| Maximum Depth: 100 m | ||||
| Sensor Type | Fluorescent | |||
| Material: | PVC / Stainless Steel | PHYSICAL DIMENSIONS | ||
| Length x Diameter: 22 x 220 mm | ||||
| Weight: 97 g | ||||
| Settling Time |
depending upon temperature |
|||
| Wiper Trigger | SDI12 Command | aM! | ||
| Built-in Network Types: | ||||
| Excitation | UV LED | SDI12 / RS485 / MODBUS over 485 | ||
| Sensor Connector | Gold Plated | Power Requirement | ||
| Voltage Range: 10-15 V DC | ||||
| Data Output | mg/L PPM °C | Standby Current: 0.8 mA Typical | ||
| Reading: 30 mA Typical |
Please Note: The D.O (DISSOLVED OXYGEN) and Temperature are pre-calibrated at the factory.
Supported Commands
Most Used Commands - SDI12
| Description | Master | Instrument Response |
| Start measurement | aM! | a05\r\n where 05 = time delay before measurement sent |
| Send ID | al! | a14KEYNESCOISO000014\r\n Part description assigned by Keynes |
| Address Query | ?! | Where a = ID number - 0 - 9 (standard) / (a..z) Enhanced SDI-12 0 - 9 / a - z for RS485 |
| Change Address | aAb! | where a = Initial address and b = Final address |
| Start Measurement | aM! | Make a measurement - a = address of sensor Example 1M! starts a measurement for sensor with ID=1 |
| Concurrent measurement: Used for starting a measurement for all the sensors in a SONDE or on a digital network. |
aC! | Start a measurement for sensor on address 'a'. |
| aD! | Return measurements |
Commonly used with: Tryptophan , Ammonia, pH & Temperature Sensors.
The Submersible Dissolved Oxygen Sensor by Keynes Controls monitors the levels of Dissolved Oxygen in water. The ARGES Dissolved Oxygen Sensor readings can be affected by changes in temperature and salinity. This sensor is frequently paired with CDOM, pH, and other temperature sensors crafted and produced by Keynes Controls.
Built-in Communication Options
The Intelligent Submersible Dissolved Oxygen Sensor By Keynes Controls supports SDI12, RS485 and MODBUS digital communications as standard enabling it to be directly connected to Data Logger for remote web based reporting, onto Wi-Fi and Local Area Networks using the RS485 option. The MODBUS and RS485 option are often used to connect sensors to a PLC Controller and Display Units,. The MODBUS protocol enables the sensors to be used directly by most SCADA applications software.
MODBUS Operations
ALL of the ARGES range of chemical sensors support MODBUS network operations The sensors act as a slave unit only and can communicate to suitable controllers and SCADA systems that support the MODBUS Protocol. The sensors support 16 and 32 bit registers. .
The ARGES sensors can be connected to a PC based system using the optional USB-485-Pro media converter. This device can power the chemical sensor and supports the correct timing protocols for data transmission for MODBUS and standard RS485 network communications
Multiparameter Housing
The ARGES Dissolved Oxygen Sensor by Keynes Controls can be used as a stand-alone device or as a part of a multi-parameter solution. Keynes Controls currently manufacture 7 port and 3 port sensor housings. An optional submersible brush unit is available for cleaning the fluorometer optics and this can be fitted into any port within the housings.
Only a single network connection fitted to the base of the housing is required to communicate with all the internal sensors. The internal sensors will automatically detect the network traffic and start operations. All of the sensors support SDI12, RS485 and MODBUS communications.
Multiparameter Measurements
The ARGES Fluorometer sensors by default take measurements sequentially and as such there will be no light pollution between sensors that can affect the results of adjacent fluorometers. Some of the filters for the different model sensors can operate at similar wavelengths and as such, a sensor monitoring for a specific chemical could effect the levels measured on a similar device.
Keynes Controls manufactures a range of accessories that can be used to connect the ARGES range of sensors to a Windows computer system and enable the sensors to be used in Laboratory applications, multi-parameter instruments and calibration operations.
The optional USB media converter can be used to connect The ARGES Dissolved Oxygen Sensor by Keynes Controls, or a multi-parameter instrument containing the Dissolved Oxygen Sensor to a Windows PC. Free applications software enables measurements to made and results displayed. The QLOG software can be used to adjust the instrument configuration.
The Intelligent Submersible Dissolved Oxygen Sensor By Keynes Controls is integrated into the Keynes Controls Q-LOG software.
Our Q-LOG software runs on the widely recognized Windows Operating system, you have the ability to calibrate, adjust instrument network address, and effortlessly display measurements on a series of panel meters and charts. Conveniently store results in text based files for quick analysis in spreadsheets.
Our highly chemical sensors provide chemical concentration and local temperature readings in SI units (Engineering units). Customize the SI units based on your instrument's capabilities, including support for multiple units like turbidity sensors, all easily managed through the device setup.
Experience the convenience of Q-LOG, enabling you to effortlessly make and install calibration values into your instrument.
Connect our intelligent ARGES Chemical sensors directly to SDI12, RS485, and MODBUS networks, leveraging the versatility of Q-LOG to acquire measurements. SDI12 communications are perfectly suited for seamless integration with data loggers, while RS485 is ideal for larger-scale network applications.