ARGES Nitrate Sensor
The Intelligent Submersible Nitrate Sensor By Keynes Controls, is a submersible sensor that has been designed to simplify the acquisition of water quality measurement parameters into any platform that supports real-time reporting, data logging operations. The sensor element is isolated between measurements in order to prolong its active life and reduct power.
The sensor can be installed into a Keynes multi-parameter SONDE, used as a laboratory stand-alone device that can also be connected to a Windows PC using a USB media converter.
The ARGES Nitrate sensor can act as a MODBUS slave sensor be connected directly to SCADA systems. a
The ARGES Nitrate Sensor by Keynes Controls directly supports SDI12, RS485 and MODBUS digital networks.
ISOLATION
The sensor element of the Nitrate Sensor is isolated when not to required for any measurements. This prevents contamination of the sensor element and maintains the long active life of the device.
When no measurement is being made the sensor is in low power mode.
Measurement Integrity
All of the ARGEs sensor range have the serial number 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 | RANGE (Typical levels) |
| Solid state ISE sensor. | |
| Measurement range: | 1.0 - 62000 mg/L / 1x10-5 to 1x10-1 Mol / 1 to 62000 ppm |
| Nitrate Resolution: | 0.005 Mol |
| Nitrate Accuracy: | +/- 5% of Reading or 2 ppm |
| Built-in Digital Networks |
SDI12 / RS485 / MODBUS (16 & 32 Bit Registers) |
| Sensor life: | Re-calibrate after 5000 hours (3 months) |
| pH Range | 2-11 |
| Isolated Electrodes | |
| Sensor Element | Isolated between measurements |
| Interference IONS | CIO4-, CIO5-,I-, CN-, BF4- |
Calibration Summary
The Intelligent Submersible Nitrate Sensor By Keynes Controls can be used within SONDE multi-parameter housing, or as a stand-alone sensor. The Nitrate sensor should calibrated before use for optimum results.
Keynes Controls offer a calibration kit for The Intelligent Submersible Dissolved Oxygen Sensor and this is available from the online store.
The ARGES Nitrate sensor is typically calibrated at 2 points. A Zero point which uses distilled water, and the high end calibration point using one of the calibration standard solutions.. The overall accuracy of the sensor will depend upon how well the sensor is calibrated. For optimum results calibrate the sensor at the same temperature as the solution under test.
Multiparameter System
The ARGES Nitrate sensor can be fitted inside a multi-parameter SONDE and used in collaboration with additional ARGES instruments.
The image opposite shows a group of ARGES sensors in a SONDE, The SONDE is being tested using the Keynes QLOG software which is freely issued with this product.
Storage and Handling
When not in use the ARGES Intelligent Submersible Dissolved Oxygen Sensor By Keynes Controls head should be kept hydrated with the protective cap attached.
Storage temperature range : 2 - 60 Degrees Celsius.
Further Information
The majority of nitrate in groundwater in the UK is derived from diffuse pollution from agriculture, with the rest from sewage sludge disposal to land, atmospheric deposition and point sources.
Nitrate levels in our water resources have increased in many areas due to applications of inorganic fertiliser and animal manure in agricultural areas. The regulatory limit for nitrate in public drinking water supplies was set to protect against infant methemoglobinemia, but other health effects have not been considered.
Application Uses
- Natural water
- Surface Water
- Ground water
- Produced Water
- Water Purification
Monitoring applications.
Product Specifications
| DISSOLVED Nitrate | ENVIRONMENTAL CHARACTERISTICS | |||
| Range | 0 - 100 ppm | Temperature Range: -6 to 55 Degree Celsius | ||
| Resolution | 0.01 ppm | Ambient Range: 0 - 50 Degree Celsius | ||
| Accuracy | 0.15 % Reading | Water Temperature: 1 to 40 Degree Celsius | ||
| Maximum Depth: 5 m | ||||
| Process Electrodes: | Reference Electrode | Potentiometric Type Operation | ||
| PHYSICAL DIMENSIONS | ||||
| Length x Diameter: 22 x 220 mm | ||||
| Weight: 97 g | ||||
| Settling Time |
|
Maximum Depth : 20 m | ||
| Wiper Trigger | SDI12 Command | aM! | ||
| Built-in Network Types: | ||||
| Excitation | Galvanic | SDI12 / RS485 / MODBUS over 485 | ||
| Housing | 316 Stainless Steel | |||
| Sensor Connector | Gold Plated | Power Requirement | ||
| Voltage Range: 10-18 V DC | ||||
| Data Output | - PPM | Standby Current: 10 mA Typical | ||
| Reading: 16 mA Typical |
Please Note: The ARGES Nitrate sensor is pre-calibrated at the factory.
The sensor head should be kept hydrated after use.
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'. |
| Read Serial Number | aXSN! | Instrument Response a+Serial-number |
| Calibration Date | aXCD! | Instrument Response a+date |
Commonly used with: Turbidity, Potassium, Tryptophan CDOM 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.
CDOM/fDOM =The ARGES CDOM/fDOM Sensor by Keynes Control is a single-channel instrument that can detect and report CDOM levels in the range of 0 - 1000 QSU and temperature in Degrees Celsius. Read More...
Submersible pH Sensor = The Intelligent Submersible pH 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. Read More...
Built-in Communication Options
The ARGES Nitrate Sensor 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 Nitrate 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 Chemical 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.
Optional Accessories
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 Nitrate Sensor by Keynes Controls, or a multi-parameter instrument containing the Nitrate 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 ARGES Dissolved Oxygen sensor 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 Fluorometers directly to SDI12, RS485, and MODBUS networks, leveraging the versatility of Q-LOG to acquire measurements on SDI12 and RS485 networks. SDI12 communications are perfectly suited for seamless integration with data loggers, while RS485 is ideal for larger-scale network applications. Maximize efficiency by simultaneously testing all sensors of a multi-parameter instrument prior to deployment.
For added convenience, the optional USB interface allows you to comprehensively test and validate the sensors' operations, ensuring seamless integration into your own application. Trust in the performance and accuracy of our multi-parameter systems!