Posts Tagged ‘Meter’

Keep Hplc Systems Honest With A Digital Liquid Flow Meter

Monday, March 13th, 2017

Digital liquid flow meters help keep pumps honest and contribute to the labs meeting FDA standards for HPLC system IQ, OQ and PQ validation as well as ongoing performance verification.

Unlike using timers while manually collecting HPLC pump effluent for measurement by weight or volume a labor intensive technique that can be subject to operator errors digital liquid flow meters greatly simplify the pump calibration process and increase the accuracy of validation procedures. HPLC Flow meters can weigh only 12 ounces and are capable of measuring pump flow rates ranging from a high of 25 ml/m down to 0.05 ml/min with a flow rate accuracy of 1 percent. Moreover, critical record keeping can be facilitated by automatic data transfer via a RS 232 interface on many units, to a PC or a battery-powered printer such as the easy to use rechargeable thermal mini-printer.

Specification and Use Suggestions:

When chemists select an HPLC flow meter they should be certain that the model is compatible with all HPLC systems they employ. Other features to look for include a traceable calibration certificate, accuracy at low flow rates, and compatibility with all common HPLC solvents.

Flow meters must be correctly mounted and consistently maintained in order to assure accurate readings. Mounting kits that ship with the units allow several options including on walls, free standing and stacking. Instructions should be closely followed. Lab technicians should establish standard operating procedures for checking the cleanliness of flow meters on an ongoing basis to avoid dirty sensing tubes that lead to incorrect readings.

Remember too that while a flow meter usually is shipped with a traceable calibration certificate, annual recalibration is required in conformance with good laboratory practices.

Fast, accurate calibration of flow rates used in HPLC flow systems can be compromised if the flow meter is not maintained. While GLP (good laboratory practices) call for annual flow meter recalibration by the manufacturer, improper use of these precision instruments can soon render them inaccurate.

A serious error is introducing in immediate succession two immiscible liquids into the flow meter. Either allow the first liquid to completely evaporate or introduce a third solvent in which the other two are miscible.

Dirty sensing tubes in HPLC flow meters may cause bubbles to become entrapped. This can create falsely high readings. If bubbles are observed, a quick fix is to turn the unit off, wait approximately 2 seconds to allow it to drain, then switch it on. Contaminated tubes will also result in an Error 4 reading denoting either the flow meter is not draining or the sensing tube is contaminated.

Another good practice is flushing the flow meter with methanol if it is not to be used for a week or more. This prevents algae growth in the tube.

Robert received his Ph.D. in Chemistry in 1986 and he is still a science geek. After graduating he worked as a bench chemist for 12 years. He then combined his passion for science and business and took entrepreneurial management positions at Bel-Art and Smiths Detection. Using the skills he learned at the big companies he co-founded, Tovatech, a laboratory equipment distributor, specializing in HPLC Flowmeter sales.

Humidity Meter

Friday, January 13th, 2017

A humidity meter, or moisture meter, is a device used to measure the amount of water and moisture in a given object. Aside from this basic function, there are advanced types of humidity meters, which are typically used by experts in specific industries. These can measure the humidity, airflow, and temperature levels of substances. Humidity meters can also determine if a given substance is compatible to be used in a given environment or industrial condition.

Typically a small and hand-held gadget, a humidity meter is equipped with a liquid crystal display (LCD) screen to show meter readings. These are usually the type of meters used to perform basic functions. There are also large moisture meters, however, which are used in planning large-scale projects to make sure that the materials used can accommodate adjustments in humidity.

Depending on the extent of applications the device is capable of doing, a humidity meter can be used for simple home inspections or basic laboratory and research experiments. Testing of materials under controlled environments and analysing humidity levels are also done with the use of humidity meters. The information provided is used in identifying if a material is wet or dry, suitable for use, or requires further examination.

In practice, the most common use of a humidity meter is to determine the moisture content of wood and concrete. Wood tends to change its shape, shrink, and even crack when it dries, depending on the wood type and lumber species. That is why before wood is used to make furniture and other equipment, it is normally left to dry first. This is where humidity meters come in.

Woodworkers make use of the meter readings to determine the moisture content of wood and if it is fit for use. Carpenters and building inspectors analyse the moisture content to make sure the wood is compatible with the humidity of the area where it is to be used. Problems in construction, such as cracked finishes, buckling, and sunken joints, can be minimized or avoided by proper moisture and humidity analysis.

For concrete, moisture or humidity detectors are capable of detecting even the small particles that can be found in concrete. This includes the density and the chemical properties of concrete. The two are measured because they can greatly affect how concrete reacts when it is dry. How the moisture content of concrete reacts with the relative humidity of air around it is also analysed.

The author is associated with IPFonline is India’s No. 1 Industrial Product Finder. The portal is a veritable storehouse of information on industrial products/services.

Turbine Flow Meter

Friday, June 17th, 2016

Overview of Flow Measurement Flowmeters are devices that measure the amount of liquid, gas or vapor that passes through them. Some flowmeters measure flow as the amount of fluid passing through the flowmeter during a time period (such as 100 liters per minute). Other flowmeters measure the totalized amount of fluid that has passed through the flowmeter (such as 100 liters). Flowmeters consist of a primary device, transducer and transmitter. The transducer senses the fluid that passes through the primary device. The transmitter produces a usable flow signal from the raw transducer signal. These components are often combined, so the actual flowmeter may be one or more physical devices. Flow measurement can be described by Q = A ? v, which means that the volume of fluid passing through a flowmeter is equal to the cross-sectional area of the pipe (A) times the average velocity of the fluid (v); and W = r ? Q, which means that the mass flow of fluid passing through a flowmeter (A) is equal to the fluid density (r) times the volume of the fluid (Q). Volumetric flowmeters directly measure the volume of fluid (Q) passing through the flowmeter.

The only flowmeter technology that measures volume directly is the positive displacement flowmeter. Velocity flowmeters utilize techniques that measure the velocity (v) of the flowing stream to determine the volumetric flow. Examples of flowmeter technologies that measure velocity include magnetic, turbine, ultrasonic, and vortex shedding and fluidic flowmeters. Mass flowmeters utilize techniques that measure the mass flow (W) of the flowing stream. Examples of flowmeter technologies that measure mass flow include Coriolis mass and thermal flowmeters. Inferential flowmeters do not measure volume, velocity or mass, but rather measure flow by inferring its value from other measured parameters. Examples of flowmeter technologies that measure inferentially include differential pressure, target and variable area flowmeters.

Flow computers are often used to compensate flow measurements for actual process conditions, such as pressure, temperature, viscosity, and composition. Additional flowmeter technologies include flowmeters that measure liquid flowing in an open channel, and insertion flowmeters that measure flow at one location in a pipe and use this measurement to infer the flow in the entire pipe. Insertion flow measurement systems often use a flow computer to compensate for hydraulic effects.

Installation Cautions for Flowmeters In liquid service, be sure that the flowmeter is installed such that it remains full of liquid, because gas/vapor in the flowmeter can alter its geometry and adversely affect accuracy. In gas/vapor service, be sure that the flowmeter is installed such that the flowmeter remains full of gas/vapor, because liquid in the flowmeter can alter its geometry and adversely affect accuracy. Disturbances located upstream (and sometimes downstream) of the flowmeter, such as pipe elbows and control valves, can adversely affect measurement accuracy, because the flowmeter may not be able to accurately measure disturbed flow streams. Be sure to locate control valves downstream of the flowmeter so their flow disturbances are not introduced directly into the flowmeter (as they would be if located upstream). Also, be sure to properly design the upstream and downstream piping with sufficient straight run to remove disturbances that can affect measurement accuracy. Be especially careful when flow is two-phase, such as liquid/gas flow and liquid/solid flow, because these flows can adversely affect the accuracy of many flowmeters. Be careful because some flowmeters can become plugged and stop working in liquid/solid flow streams. Application Cautions for Flowmeters Each type of flowmeter has its own specific applications and installation constraints. There is no “one size fits all” flowmeter. The way to select the right flowmeter is to use the application as your guide, not the technology. Many of these technologies will all work well on many applications. If you start with the application, you can select the technology you wish to use based on accuracy, cost, durability and reliability, rather than trying to make the technology you chose fit the application you have.

To know more about turbine flow meter technology you should visit You can also learn more about water flow meter.

Mano Meter – Puppet On a String

Sunday, May 15th, 2016

Mano Meter – Puppet On a String
from 100 EDM Workout Music
Price: USD 0.99
View Details about Mano Meter

Highly Reliable Flow Meter Measures Blended Waste & Natural Gases For Co-Gen Power

Friday, January 22nd, 2016

Highly Reliable Flow Meter Measures Blended Waste & Natural Gases For Co-Gen Power
Designed for demanding environments, the rugged ST98's thermal mass flow sensing element is constructed with two all-welded 316L stainless steel thermowells, protecting two matched platinum precision resistance temperature detectors (RTDs). One RTD …
Read more on International Environmental Technology

Flow meter for waste & natural gases
Designed for demanding environments, the rugged ST98's thermal mass flow sensing element is constructed with two all-welded 316L stainless steel thermowells, protecting two matched platinum precision resistance temperature detectors (RTDs). One RTD …
Read more on PACE Today

Safety-Instrumented Systems: Focus on Measurement Diagnostics
New standards, such as ASME PTC 19.3-2010, significantly improve the reliability of wake-frequency calculations and minimize the risk of thermowell failure due to flow-induced vibration and transient effects. • The measurement is fast enough to detect …
Read more on ChemEngOnline

Energy Meter ? Reading the Gauge

Friday, May 8th, 2015


The amount of electricity or gas flowing into any building is measured by an energy meter. When used to measure gas, the meter is connected to the main inlet gas pipe of the residential or office building. Meters can be read by anyone, but the readings that matter are those taken by officials of the utility company in order to generate your monthly usage bill.

An energy meter that measures usage of gas has a detector and an element within it. The element is heated by gas as it passes through the meter while the detector monitors the amount of heat from the element. The amount of heat generated is then used to come up with the volume of gas consumed based on an internal scale. Then it displays readings on the face of the meter. So the meter reader does not need to struggle to get the data. The flow of gas is what determines the overall volume consumed. However, in between the two results, there is the temperature. As the speed of gas flow increases, this temperature rises and the high speed causes the volume rating to go up too.

An energy meter measures the usage of a unit of energy in kilowatt-hour. One kilowatt-hour is equal to 3.6 megajoules of energy. The different forms of energy have been converted into a single measurement unit so that each utility company can easily bill its customers. Energy meters for gas companies track the volumetric rate of flow of the gas over time. So far this is the most accurate method for measuring the quantity of gas used as at any period of time.

Tracking the flow of gas using temperature-based meters is very beneficial to all users. Home users as well as business persons end up paying only the exact amount of gas that they have used. The system is also effective in buildings with multiple tenants who are connected to the same gas meter. There is no justice if say one person who is rarely in the house and thus uses very little gas, pays an amount equal to what a heavy gas user pays. So by using temperature-based metering then each user pays for only the gas amount they have actually used.

Even the energy meter used by electricity company works on an almost similar principle, only that they do not rely on temperature or volume. Instead they operate on electromechanical induction. However, the units of measurement are still the kilowatt hour. Just like the gas meters, electricity meters can be read by the tenant or an employee of the electric company. The electricity company sends its employee on a regular basis to take the readings on the energy meter. The readings are then used to create the customer’s bill. Readings of some meters can be obtained remotely from the company headquarters. But if you see the company employee around, every few weeks, it means your meter is the manually read type. New meters are the ones that can be read remotely, by virtue of the technological developments in the world.

The best way to conserve your energy usage and save money in the process is to keep an eye on the energy meter. By taking note of the amount of gas or electricity consumed in your home or office you can take a few basic steps that will save you a lot. Keep in mind that the way you use that energy affects the rest of the world.

More information about energy meter can be found by browsing through the mentioned links and always remember that the energy meter affects the rest of the world.


More information about energy meter can be found by browsing through the mentioned links and always remember that the energy meter affects the rest of the world.

SaraH AslaM

Stack Gas Flow Meter utilizes Torbar averaging pitot tube.

Friday, May 1st, 2015

Stack Gas Flow Meter utilizes Torbar averaging pitot tube.
December 4, 2013 – In addition to Torbar averaging pitot tube flowmeter, FPD581 StackFlowMaster consists of metering probe with optional integral components that include RTD temperature element, 5-valve manifold, multivariable transmitter, and purging …
Read more on ThomasNet News (press release)

systec Controls introduces integrating pitot tube
The company, which specialises in flow meters, manufactures teflon probes with reduced surface resistance for use under extremely corrosive conditions. These probes are particularly corrosion resistant. By doping the material with carbon, static …
Read more on Energy Global

2004 Dodge Ram Rumble Bee 1500 Auto Meter Mopar Performance Mechanical Oil Pressure Gauge install

Tuesday, January 6th, 2015

This is just a overview after the gauge has been installed. Looking at this video will still give you, I think, good instructions on how to install the oil p…