Thursday, May 18, 2017

Thermal Flow Measurement for Gases

thermal mass flow meters for gases insertion and in-line
Installation variants of thermal flow meters
Thermal mass flow measurement technology has been used in industrial process measurement and control applications for many years. The basic operation involves measuring flow in relation to its heat dissipating effect on a temperature sensor. Higher mass flow produces a higher rate of heat transfer.

The mass flow measurement instruments are very popular for several reasons. They have no moving parts, have a fairly unobstructed flow path, are accurate over a wide range of flow rates, calculate mass flow rather than volume, measure flow in large or small piping systems, and do not need temperature or pressure compensation. While most thermal flow meters are used to measure flowing gas, some also measure flowing liquids.

Thermal mass flow meters are cost effective and accurate making it an excellent choice for a wide variety of gas flow applications.

The technology measures the amount of heat required to maintain a sensor at a reference temperature, offsetting the cooling effect of the mass flow over the sensor. The technology is well suited for installations requiring the measurement of low pressure gases where the fluid components are known and remain constant. Thermal mass flow measurement is also employed effectively in a number of other scenarios.

Potential advantages of thermal mass flow technology for industrial process measurement and control:
  • True mass flow reading using a single instrument
  • No significant impact on measurement from fluid pressure or temperature
  • Comparative cost is moderate
  • No moving parts
  • Minimal restriction of flow introduced by sensor
Thermal mass flow sensors have attributes making them very suitable for a family of applications. Like all measurement technologies, there are also areas of caution in their application. Any measurement technology must be properly applied in order to obtain reliable results. Talk to a sales engineer about your flow measurement ideas and applications. Combining your process expertise with the knowledge of a product application specialist will produce good results.

Wednesday, May 10, 2017

Application of Thermo Fisher Density and Level Instruments



The video, produced by Thermo Fisher Scientific, shows how an integration of flow, level, and density measurements is used to regulate the feed and operation of a coke production system. The integration of several instruments and technologies serves to provide operators with a continuous stream of accurate information about the product level, foam interface, and material content at various points in the drums. Closely monitoring the process enables best use of available drum space and control of the process.

Determining and applying the most effective measurement technology for any process is a key element of achieving optimum output. Share your measurement challenges with instrumentation specialists, combining your own process knowledge and experience with their product application expertise to develop effective solutions.

Wednesday, May 3, 2017

Multiple Generator Condition Monitoring Functions in a Customized Unit

gas cooled generator monitoring unit
Multi-parameter generator monitor
Courtesy E/One Utility Systems
Electric power generation involves enormous investment in fixed equipment operating at conditions requiring precision control of many variables. The availability of accurate real-time generator monitoring information can be the key element in maintaining precision equipment in good operating condition and avoiding downtime caused by failure.

E/One Utility Systems designs and manufactures a generator monitoring system combining multiple functions into a consolidated unit, fully engineered and coordinated for each application. Each customer can choose to incorporate functions as needed for their installation.
  • Generator Auxiliary System
  • Generator Gas Analyzer
  • Generator Condition Monitor
  • Generator Gas Dryer
  • Auxiliary Systems
This flexible and cost efficient approach to gas monitoring and control systems for electric power generators capitalizes on the use of pre-engineered modules to reduce installation and on-site engineering burden.

More information is provided in the document below. Share your power generator monitoring and control challenges with product specialists and work together to develop effective solutions.



Thursday, April 20, 2017

Standalone Process Temperature Controllers

industrial process controllers 1/4 DIN 1/8 DIN 1/16 DIN
Industrial process controllers can be applied to temperature
or other control parameters.
Courtesy Chino
The regulation of temperature is a common operation throughout many facets of modern life. Environmental control in commercial, industrial, and institutional buildings, even residential spaces, uses the regulation of temperature as the primary measure of successful operation. There are also countless applications for the control of temperature found throughout manufacturing, processing, and research. Everywhere that temperature needs to be regulated, a device or method is needed that will control the delivery of a heating or cooling means.

For industrial process applications, the temperature control function is found in two basic forms. It can reside as an operational feature within a programmable logic controller or other centralized process control device or system. Another form is a standalone process temperature controller, with self-contained input, output, processing, and user interface. A temperature switch could be considered as a rudimentary, yet very effective standalone temperature controller. Depending upon the needs of the application, one may have an advantage over the other. The evolution of both forms, integrated and standalone, has resulted in each offering consistently greater levels of functionality.

There are two basic means of temperature control, regardless of the actual device used. Open loop control delivers a predetermined amount of output action without regard to the process condition. Its simplicity makes open loop control economical. Best applications for this type of control action are processes that are well understood and that can tolerate a potentially wide variation in temperature. A change in the process condition will not be detected, or responded to, by open loop control. The second temperature control method, and the one most employed for industrial process control, is closed loop.

Closed loop control relies on an input that represents the process condition, an algorithm or internal mechanical means to produce an output action related to the process condition, and some type of output device that delivers the output action. Closed loop controllers require less process knowledge on the part of the operator than open loop to regulate temperature. The controllers rely on the internal processing and comparison of input (process temperature) to a setpoint value. The difference between the two is the deviation or error. Generally, a greater error will produce a greater change in the output of the controller, delivering more heating or cooling to the process and driving the process temperature toward the setpoint.

The current product offering for standalone closed loop temperature controllers ranges from very simple on/off regulators to highly developed products with multiple inputs and outputs, as well as many auxiliary functions and communications. The range of product features almost assures a unit is available for every application. Evaluating the staggering range of products available and producing a good match between process requirements and product capabilities can be facilitated by reaching out to a process control products specialist. Combine your own process knowledge and experience with their product application expertise to develop effective solution options.

Thursday, April 13, 2017

Continuous On-Line Conductivity Monitoring for Water-Steam Cycle

continuous conductivity monitor for condensate, ion exchange, feedwater, steam
Continuous conductivity
monitoring system
Courtesy Swan AnalyticalInstruments
Specific conductivity measurements of water used in industrial processes can reveal important information about the water quality and its suitability for a particular use. Condensate and feedwater, as well as other process uses of water, routinely use specific conductivity measurement to confirm or analyze process performance.

Continuous conductivity measurement that delivers real time data is the most beneficial setup for monitoring water quality. The instrumentation will be an integral part of a larger control and monitoring system, so a variety of selectable output signals is advantageous. Programmable function relays that can respond when certain conditions occur provide the operator with additional automatic response options for coordinating other operations or alerting when conditions are out of a desired range.

Processing operations will benefit from products that minimize the amount of user time required to keep instrumentation in operation. Whether calibration, repair, adjustment, or required maintenance, any instrument that reduces the amount of "customer involvement" is worth considering.

The AMI CACE from Swan Analytical Instruments is a continuous on-line conductivity monitor targeted at water-steam cycle applications. It incorporates a host of technological and user friendly features that make it an advantageous choice for feedwater and condensate monitoring. Detail is provided by the datasheet included below. Share all your analytical and steam system monitoring requirements and challenges with instrumentation specialists. The combination of your own process knowledge and experience with their product application expertise will yield an effective solution.


Tuesday, April 4, 2017

Gas Density Meter Provides Continuous Inline Density Monitoring

gas density meter product configurations
Gas Density Meters
Courtesy Thermo Scientific
Gas density measurement is crucial when looking at the molecular makeup of a sample, when quantifying variables which make up a whole. Custody transfer operations and other fiscally related operations can also require gas density measurement to properly determine delivered gas quantities. The Thermo Fisher Sarasota gas density instruments are specifically designed to deliver high accuracy continuous inline measurement of density and density related variables. Employed in large scale processing, gas density measurement is often found in the gas, chemical, and petrochemical industries, along with power generation operations.

Thermo Scientific’s Sarasota line of gas density instruments provide a measurement that can, with the use of auxiliary flow computers or other electronics from the company or third party vendors, provide additional data for specific gravity, calorific value, or molecular weight. Three basic meter styles provide for direct insertion, bypass, or pocket mounting arrangements. Two versions of each type are offered, with the first providing a frequency output and 4-wire PT 100 temperature sensor output for use by a flow converter or other computational device. The second version has an onboard HART compliant density converter with 4-20 mA output.

As the measured gas flows through the meter, it interferes with the base frequency of the vibrating sensor tube in proportion to the density of the gas. The instrument measures the change in vibration frequency, which is used to calculate the density. The onboard precision RTD provides for temperature compensation. Other features include:
  • Readings unaffected by pressure
  • Available for use in hazardous environments
  • Third party certifications
  • Connection options
  • Wide temperature range operation
  • Interfaces with Thermo Fisher flow computers, or other brands
  • Continuous online density monitoring
There are numerous industrial applications for the density meters, including energy management, flue gas analysis, custody transfer, burner control, stack emissions analysis, process and quality control, and more. A specialized retractor enables removal of the direct insertion gas density meter from the piping system under operating conditions up to 2500 psi.

Variants of the instrument accommodate a wide range of application and installation requirements. More detail is provided in the datasheet included below. Share your gas density and other process measurement requirements and challenges with product application experts. The combination of your process knowledge and their product application expertise will produce effective solutions.


Wednesday, March 22, 2017

New Functional Safety Transmitter - Frequency to DC

functional safety transmitter frequency to DC
The SFY Functionnal Safety Transmitter
Courtesy Moore Industries
Populating a safety instrumented system with properly configured and rated devices can be challenging. Moore Industries has released a transmitter providing frequency input to DC signal output that carries approvals for use in SIL2 and SIL3 instances.

The SFY model converts the frequency pulse output of another device into a 4-20 mA output signal for use in logic solvers and control equipment. The instrument carries a host of certifications and approvals, making it suitable for use across many industries and jurisdictions.

The datasheet below provides more detail about this recently released transmitter for industrial process control. Share your process measurement and control requirements and challenges with product application specialists, combining your own knowledge and experience with their product application expertise to develop effective solutions.