current meter Articles
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Turbine flow measurement in intakes: a cost-effective alternative to measurement in penstocks - Case Study
Hydro utilities require flow meosurement for the settlement of turbine contracts and to support optimal operation. The high costs and inconvenience associated with traditional methods (instruments installed in penstocks) are leading some utilities to search for cost-effective alternatives. BC Hydro's investigations into flow measurement in intakes are discussed. Typical practice for turbine flow ...
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H-ADCP Flow Gauge, Wessex Water case study
Wessex Water, Design, supply and installation of low-flow environmental impacts monitoring system on the River Yeo in Somerset, 2005-2008 Wessex Water contracted HL to install a new flow-gauge to provide flow data on the environmental impact of abstraction upstream and downstream of a riverside borehole for public-supply. Due to the channel and hydraulic conditions at the site on the River Yeo ...
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What is 61-channel resistivity meter?
FlashRES resistivity meter has 64 electrodes, it uses one common ground electrode, two electrodes as current injection electrodes. For each current injection between A and B, the FlashRES resistivity meter measures the potential on remaining electrodes against the common ground electrode. In this way, 61 MN voltages are measured and hence FlashRES is a 61 channal resistivity meter. Currently only ...
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OTT SVR 100 - Surface Velocity Radar for Measuring Open Channel Flow
Introduction The measurement of water surface velocities to determine discharge in rivers and open channels is one of the oldest measuring methods in hydrometry, well-tried and easy operably since centuries with the aid of floaters. The determination of discharge by surface velocity measurements is also covered by various hydrometric standards and guidelines such as ISO 748 “Hydrometry ...
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Discharge measurement deep within a cave - Case study
Research is currently being conducted in the Hessenhau cave, located in southern Germany. The cave is the deepest known within the Swabian Alps at 144m (472 ft) and has a stream running through it that connects it to other caves within the area. Discharge measurements were taken in different parts of the cave with the OTT MF pro electromagnetic current meter. Reaching the bottom of the cave ...
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Scottish Environment Protection Agency (SEPA), 2004 - 2005 case study
Supply and installation of flood warning system Supply of 12 no. Hawk XT telemetry loggers for use with tipping-bucket rain-gauges plus supply and installation of 6 no. telemetered flow gauges to the SEPA west area as part of a flood warning instrumentation project. Each flow gauge was comprised of a Teledyne RDi Channelmaster H-ADCP with a Hawk XT outstation. The Isodaq FEP6 telemetry server ...
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Permanent Monitoring Systems for Seabed Leakage Detection
Seabed leaks Where do they come from? Natural vents: Faults, Pockmarks, and Chimneys Melting hydrates Shallow gas layers Long term leakage along well casings (cracked cement) Injection: fault re-activation/fracturin Lost well control nd failing barriers The mysterious pockmarks at the Troll field Footprints from melted hydrate lumps (after the last glacial period) Characteristics of ...
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Mexico - HydroMet Calibration Vehicle with WS501 weather station on board - IGS Hydro - Case Study
The Office of Meteorology and Hydrology in Mexico equipped a vehicle with measurement technology for verification of their Hydro-Met stations. We are proud that they decided to choose our smart WS501 compact weather station (All-in-one) for measurement of the meteorlogical parameters. With the integration of the smart weather sensor WS501-UMB the calibration vehicle can provide accurate data ...
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Scottish Water case study
Scottish Water, 2007 ongoing Improving reservoir yield assessments and compensation flow monitoring Scottish Water commissioned HL in 2007 to deliver two separate flow monitoring contracts to help improve the water companies understanding of the yield and low flow conditions at several water supply catchments across Scotland. One project involved the installation of reservoir level, inflow flow ...
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Yield Assessment, Scottish Water case study
Scottish Water, 2007 ongoing Improving reservoir yield assessments and compensation flow monitoring Scottish Water commissioned HL in 2007 to deliver two separate flow monitoring contracts to help improve the water companies understanding of the yield and low flow conditions at several water supply catchments across Scotland. One project involved the installation of reservoir level, inflow flow ...
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Rogowski Coil Current Sensing Method
In an earlier blog post, we introduced the 6 different current sensing methods used in the current meters and sensors developed by Hioki. Here, we highlight the Rogowski coil method that enables the design of flexible sensors through the use of an air core (or coreless) structure. In a Rogowski sensor, there is no heat generation, saturation and hysteresis due to magnetic loss, and the insertion ...
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The Hall Element Method for Current Sensing
A few months back, we posted a blog discussing the 6 different current sensing methods used in the current meters and sensors developed by Hioki. Here, we’re highlighting the sensors that incorporate a Hall Element to detect current. A Hall Element is a semiconductor sensor that applies the Hall Effect principle to measure the flow of current through a conductor via the magnetic field the ...
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OTT ADC measurement - Germany
Background As the open pit Cottbus Nord is making use of the water of the ponds in the protected landscape of Lakoma (a village 6 km from Cottbus) the Vattenfall Europe Mining AG (VEM) as owner of the pit was obligated to take compensation measurements. VEM entrusted the engineers of the gerstgraser Ingenieurbüro für Renaturierung (gIR) in Cottbus with the planning of the structuring ...
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Online discharge measurement with horizontal doppler-flow sensor
Background The regional authority responsible for the barrages in the Free State of Saxony is in charge of the water management of the Rötha. Reservoir. This reservoir is situated close to the river Pleiße, from which the water is led over a weir into the reservoir.. Knowledge about the inflows of the reservoir is important for the water management there. So far, the rate of flow at the ...
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How Do Dissolved Oxygen Probes Work?
How Do Dissolved Oxygen Probes Work? Dissolved oxygen probes deal with redox (redox) reactions, providing continuous and real-time measurements. Because they have an applied voltage, most DO probes require a "warm-up time" before use to polarize the electrodes before measuring DO in water. After connecting the dissolved oxygen probe to the meter, immerse the electrode sensor (dissolved oxygen ...
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Will smart meters really speed up electricity consumption?
On TV news and the Internet, we have seen that a tradtional energy meter is replaced by a smart meter, and the users feel that the smart meter speeds up electricity consumption. In response to such questions, today, we analyzes and reveals the reasons from the technical level of smart meters, and recommends the way to resolve it. Why do users feel that smart meters speed up electricity ...
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YTL AMI data acquisition system!
YTL AMI data acquisition system!YTL AMI data acquisition system! In the smart grid, AMI is an infrastructure that can be designed and configured as required. Not a single technology, but a multi-technology complex that enables intelligent communication between power companies and users. It can provide users with the information needed to make decisions, the ability to execute decisions, and some ...
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The future of smart meters
The future of smart meters What are the biggest features of smart meters? It is interaction, the information interaction between the user and the power supply bureau. The key lies in convenient and user-friendly management, which requires stronger information processing capabilities of the chip. The future development of electric meters is the direction of modularization, networking and ...
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Basic Techniques for Accurate Resistance Measurement
Reduce Measurement Errors in your Application At CAS DataLoggers we often receive calls from users working in resistance measurement applications, for example using string pots to measure movement, measuring thermistors/RTDs for temperature, measuring the resistance on test samples, and many more applications. Some of our callers are surprised to learn that there’s a variety of different ...
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Sound Level Meter Apps – How Accurate Are They?
There has been a growing awareness of the availability and application of sound level meter apps providing noise measurement functions. Some of these sound level meter apps have been designed to meet, when used with a suitable external microphone, compliance with the relevant instrumentation standards. The vast majority of these are available as free downloads from the Google Play Store or the ...
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