Water level can be measured using any one of the methods below: The measurement methods include:
• Method 1 – a still well or still pipe with a shaft encoder with a float and beaded float line system.
• Method 2 – a pressure sensor which is immersed into the stream or river.
• Method 3 – the more complex pressure bubbler system which allows for a small open tube to be immersed into the stream or river with a gas pump or gas cylinder to inject small bubbles into the open tube and measure water depth by measuring the back pressure required to force bubbles out of the tube in the water.
• Method 4 – Measuring depth using Ultrasonics Doppler Instrument 6527.
• Method 5 – Measuring depth using Radar.
There are many measuring methods available, but still the most common method is a shaft encoder float and wheel system. This method requires a large well or a smaller pipe to be installed on the stream, river bank or on a bridge structure, to provide a stable, not disturbed by flow or wind, measurement environment.
A small float, a float line and a counter weight system will respond to depth/level changes in stream or river. That response causes rotation of the shaft of a wheel. Shaft rotation is measured very accurately by optical encoder and the data is simultaneously displayed and recorded in the data logger within the instrument.
The Unidata Model 6541 Precision Water Level instrument can achieve operating accuracy and resolution of 0.2mm. This accuracy is maintained for the service life of the instrument without calibration or maintenance, apart from battery changes. The 6541 instrument has the range to monitor surface and under- ground waters, and the precision to monitor rainfall and evaporation. The very low mechanical friction and inertia of the instrument means that it can produce data with high precision and accuracy. Unidata Precision Water Level Instruments have been installed at over 5000 sites. The power consumption of this instrument is tiny, only a few micro amps is needed to operate it, so it can be run on a single battery pack for more than a year.
The 6541 instrument is normally “connected” to the water surface by a float system. On installation, the instrument is set to display the water level. An optical encoder is mounted on the input shaft so, as the water level changes, the input shaft and encoder rotate. The rotation of the encoder is continuously monitored so the instrument tracks water level changes. These changes update the LCD display. Choice of encoding wheel diameter, length of float line and type of float will depend on the site conditions and measurement objectives.
A Water Level Instrument can be equipped with an internal micrologger that can store measured data or connected to a Neon Remote Logger to provide a temporary store of the data until it is transmitted to central Neon sever on a regular basis. When connected with a Neon Remote Logger you can monitor data recorded by the instrument and check the health of the site, all from a web browser on the internet.
This can be done over cellular or satellite communication links. Using telemetry decreases the need for time consuming site visits. When you use one of the telemetry options you may need to provide external power such as a solar panel, external battery and regulator.
|Options for Application Specific Instruments / Inputs||Unidata Part Number||Description|
|Water Level Instrument||6541C-11||WLI with 500mm Pulley & Alk Batt Metric (Imperial version available)|
|Float||6541F-115||WLI Float - Cylinder 115mm (other options available)|
|Float Line||6541D-M||WLI Beaded Floatline Metric (Imperial version available)|
|Options for Neon Telemetry - NRL / NRT / RTU / Field Units||Unidata Part Number||Description|
|Neon Remote Logger 16 Channels||3016A||Options Available: 3G/4G Cellular, Ethernet, Globalstar, Inmarsat, Iridium SBD and LoRa|
|Neon Remote Logger 8 Channels||3008A||Options Available: 3G/4G Cellular, Ethernet, Globalstar, Inmarsat, Iridium SBD and LoRa|
|Neon Remote Logger 4 Channels||3004A||Options Available: 3G/4G Cellular|
|Neon Remote Logger 4 Channels M Series||3004A-M||Options Available: 3G/4G Cellular, Ethernet, Microsatellite, Iridium SBD and LoRa|
|Cellular RTU 3G/4G||2013F-AB03 / 2013F-AB04||Neon Metering Module 3G/4G with Antenna and Li Battery|
|Cellular RTU 3G/4G - Industrial||2016F-AB03 / 2016F-AB04||Neon Remote Terminal 3G/4G with Antenna and Li Battery|
|Ethernet||2017F-0B0-1 or 3||NRT Ethernet with single or triple Ethernet Ports with three Li Batteries|
|Equatorial Orbit Satellite - Inmarsat||2018F-AB0-1 or 3||NRT Ethernet with single or triple Ethernet Ports with three Li Batteries|
|LCD Display||2500E||NRT LCD Display|
|NRT Field Termination Strip||2103F||2015F,2016F,2017F, and 2018F NRT FTS|
|NRT Firmware Option||2303A-8M||8M Extended Memory Option|
|NRT Firmware Option||2303A-8M-CAM||8M Extended Memory & Serial Camera Option|
|NRT Firmware Option||2303A-CAM||Serial Camera Option|
|Options for Neon Application Software - Customer Server||Unidata Part Number||Description|
|Neon Application Software||2302A||Neon Server Software Licence Incl 5 NAL |
|Neon Application Software||2302A-10||Additional 10 NRT Access Licences|
|Neon Application Software||2302A-20||Additional 20 NRT Access Licences|
|Neon Application Software||2302A-50||Additional 50 NRT Access Licences|
|Options for Neon Application Software - Unidata Server||Unidata Part Number||Description|
|Neon Application Software||2301A||Neon Data Initial Subscription Setup Fee|
|Neon Hosting Service||2301A-01||Neon Data Service Fee for 1-50 NRTs|
|Neon Hosting Service||2301A-02||Neon Data Service Fee for 51-100 NRTs|
|Neon Hosting Service||2301A-10||Neon Data Service Fee Metering|
|Options for Conventional Dataloggers / Field Units||Unidata Part Number||Description|
|Neon Remote Logger 16 Analog Channels / Touch Screen Display||3016A-000||16 Ch NRL (Superseded Prologger 7001D)|
|Neon Remote Logger 8 Analog Channels / Touch Screen Display||3008A-000||8 Ch NRL (Superseded Stalogger 6004D)|
|Neon Remote Logger 4 Analog Channels / Touch Screen Display||3004A-000||4 Ch NRL (Superseded Micrologger 8010C)|
|Starlog V4 Management Software||6308A-AUE||Starlog V4 Full Licence Key|