ARGES Type Sensor
The Intelligent Submersible pH 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 data logging operations using digital network communications, and directly into a Windows PC using the optional USB-SDI12 interface.
The sensor can operate as part of a multiparameter system or as a stand-alone sensor on a digital network. The sensor returns results directly in pH (SI) units.
Each of the Intelligent Submersible pH 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.
For fast and easy measurements use the optional USB-SDI12-AGI interface and plug the sensor directly into a Windows PC
ISOLATION
The sensor element of the ARGES pH sensor electrodes are isolated in order to optimise the life of the electrodes.
When no measurement is being made the sensor is in its lowest power mode.
Measurement Integrity
Product Features
| TYPE | RANGE (Typical levels) |
| Solid state ISE sensor. | Glass bulb and Solid Reference electrode |
| Measurement range: | 0 – 14 pH |
| Resolution: | Five auto range scales: 0.00 - 14.00 pH |
| Accuracy: | 0.1 pH +/- 0.1 mV |
| Operation |
Stand-alone and Multiparameter SONDE |
| In-built Digital Communications (Standard) | SDI12 v1.4 RS485 MODBUS (16/32 Bit Registers) |
| Long storage shelf life | |
| Low power | 10-18V DC 1 mA Standby |
| Sensor Element | Isolated between measurements |
| Interference IONS | no significant interference |
Calibration Period
The Intelligent Submersible pH Sensor by Keynes Controls can be used within SONDE multi-parameter housing, or as a stand-alone sensor. The pH sensor should calibrated before use for optimum results. pH measurements can be effected by temperature so it is recommended to calibrate the sensor at, or around the temperature for which it is to be used.
Keynes offer a calibration kit for the pH sensor and this is available from the online store. The calibration kit covers the most common operating range of the sensor and covers three measurement points. One of the calibration points is taken using distilled water to give a reference of pH of 7 at 25 Degrees Celsius. Buffer solutions give the additional calibration points of approximately +9 and 3 pH from that of distilled water pH level.
Recalibrate after prolonged submerged use.
pH Sensor Testing
The ARGES pH sensor can be used as stand-alone instrument and also within the Keynes multi-parameter SONDE housings as part of a multiparameter solution. The image below shows the multiparameter SONDE on test in with a pH sensor installed..
The ARGES pH sensor can be directly deployed into water ways and results recorded directly to a Windows PC using the USB-SDDI12-AG1 interface and the free QLOG applications osftware.
Storage and Handling
When not in use the ARGES pH sensor head should be kept hydrated with the protective cap attached.
Storage temperature range : 2 - 60 Degrees Celsius.
Product Specification
| PH Sensor | ENVIRONMENTAL CHARACTERISTICS | |||
| Range | 0 - 14 pH | |||
| Resolution | 0.01 pH | Ambient Range: 0 - 60 Degree Celsius | ||
| Accuracy | 1% Reading | Water Temperature: -5 to 60 Degree Celsius | ||
| Maximum Depth: 20 m | ||||
| Process Electrodes: | Reference Electrode | Ag/AgCl | ||
| PHYSICAL DIMENSIONS | ||||
| Length x Diameter: 22 x 220 mm | ||||
| Weight: 97 g | ||||
| Settling Time |
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| Wiper Trigger | SDI12 Command | aM! aD! | ||
| Built-in Network Types: | ||||
| Excitation | Galvanic | SDI12 V1.4 / RS485 / MODBUS over 485 | ||
| Housing | 316 Stainless Steel - PVC | |||
| Sensor Connector | 5-Pin Gold Plated | Power Requirement | ||
| Voltage Range: 10-18 V DC | ||||
| Data Output - SI | pH Temp (Degrees Celsius) | Standby Current: 1 mA Typical | ||
| Reading: 10 mA Typical |
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 |
Built-in Communication Options
The ARGES pH sensor supports SDI-12, 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 HOUSINGS
The ARGES pH Sensor by Keynes Controls can be used as a stand-alone device or as a part of a multiparameter solution. Keynes Controls currently manufacture 7 port and 3 port sensor housings.
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 Intelligent Submersible pH Sensor by Keynes Controls, or a multi-parameter instrument containing the pH 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 pH 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 single ion chemical sensors report results based upon SI units based on your sensor capabilities.
Experience the convenience of Q-LOG, enabling you to effortlessly make and install calibration values into your instrument.
Connect our Single-ion-sensors directly to the 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!
WARNING:
Favourable measurements made by this equipment do not guarantee that a water sample is safe for human or animal consumption. The ARGES sensors can not detect the presence of harmful bacteria or toxins. If in doubt, ALWAYS TREAT SUSPECT WATER PRIOR TO CONSUMPTION.
Additional Information:
Related Products by Keynes Controls: ARGES pH, ARGES Tryptophan, ARGES Conductivity, ARGES Turbidity, ARGES Hydrocarbon, ARGES CDOM, Dissolved Oxygen,
Key Words Related to Identifying Our Products or Intended Product Use or Product Outcome: Water, H2O, Water Disinfection, Water Purification, ARGEs Hydrocarbon, PAH Sensor