Differential Pressure Transmitters for Kiln and Furnace Applications

Many industries rely on large furnaces. For example, the gas and oil industry uses a great deal of heat to refine and process crude oil. The steel industry must heat metals as part of heat treatment processes that occur in special furnaces. With new EPA regulations and efficiency considerations, it’s important to keep pressure low and this has led to special draft range differential pressure transmitters like the DR800. This instrument provides several important benefits in furnace operations.

The Importance of Furnace Draft

The flow of air within a furnace is a vital to energy efficiency and heat control. But what is draft? Draft is the difference between atmospheric or room pressure and pressure within the furnace combustion chamber. This affects the flow of airneeded for the combustion process.

Drafts can be natural, forced, induced or balanced. It is important to monitor this airflow at all times, as it can greatly affect temperature and heat transfer. Draft range differential pressure transmitters are able to detect very low amounts of pressure and send their readings to a furnace control system. In fact, the DR800 can measure pressures as low as 0.1 inches H2O full scale, delivering accuracy to within 0.5 percent. The DR800 is extremely stable, even though large ambient temperature ranges.

Thanks to the DR800, pressure calibration is uncomplicated. It is made possible by including a Hi/Lo gain jumper and continuous the span adjust. You also can choose an LCD display for local indication.

The DR800 is very durable, but should you need repairs they can be done right in the field. You can easily remove its entire electronics housing without disassembling the unit. Plus, your maintenance personnel won’t have to carry specialized tools for the job. The NEMA 4 enclosure and standard process industry form factor make the DR800 easy to use.

To check out the differential pressure transmitters we have to offer, visit our home on the Web today at http://validyne.com/ or call 818-886-8488.

5 Things to Consider when Working with a Pressure Transducer

Pressure is crucial in fluid-power circuits. Using a pressure transducer allows you to control your system. Connecting the transducer a power source, while plumbed to a pressure source, generates an electrical output signal that matches the pressure. However, there are many considerations when you use this equipment. Here are some of them:

The Pressure Range

Since pressure transducers are designed to provide electrical output to match any given pressure range, make sure you pick a pressure transducer with a full scale range that is closest expected pressure. Also, check and confirm if the electrical output signal is matched to the needs for your existing system. Compatibility issues can compromise results or damage the pressure transducer.

Quality

Using trustworthy suppliers, such as Validyne, to source a premium-grade pressure transducer should be a priority. In doing so you won’t have to contend with units that exhibit low-quality performance. Opting for the right suppliers will keep those superior-quality transducers coming whenever you need them.

Installation

Be careful not to damage the electrical connector during the installation process. Denting a pin or connector shell could damage your unit. To prevent this from happening precisely follow the installation guidelines. If you have any doubts, ask for an installation professional for help. Be sure to connect the pressure transducer pressure ports with high quality NPT fittings and use Teflon tape on the threads.

System

Accuracy and reliability are important. Check to make sure the cabling, readout devices, signal conditioning, and amplification units are all in good working condition. Don’t forget about the power wiring to the transducer, as that is a common spot for trouble.

Maintenance

You will need to ensure the transducer receives proper maintenance and care. That’s the best way to ensure optimum performance. Regularly check the pressure transducer pressure connections for leaks, and tighten as needed. Also, keep all electrical connections between the system and components free of water and spray.

Keeping your transducer functioning at top form is crucial, so keep these practical tips in mind. If you need to know more about transducers, seek contact us today!

The Operation of, and Benefits Provided by, Our Variable Reluctance Pressure Transducer

All pressure transducers sense pressure from the outside mechanically and produce an electrical signal in response to these changes.

When it comes to the variable reluctance pressure transducer, a sensing diaphragm changes position with pressure, inductively changing the impedance of the two sensing coils. This change produces an electrical signal.

As the potential user of pressure transducers, you need to know what type of unit is best suited for your particular application. At Validyne Engineering, we can point you in the right direction to find the pressure transducer that matches your particular needs.

Let’s look at the Variable Reluctance Pressure Transducer

The VR pressure transducers we offer at Validyne Engineering consist of a flat diaphragm (magnetically permeable) supported between two coils. A magnetic field is produced between the coils and the diaphragm when an AC excitation is applied. The opposition to the lines of flux (called the reluctance) is determined by the air gap present between the two coils and the diaphragm. The coils are wired electrically as an inductive half-bridge.

In this arrangement, an AC signal is produced in direct proportion to the deflection of the diaphragm. This is how it works: with the diaphragm in a relaxed, or ‘zero’ state, position, the magnetic field between coil 1 and the diaphragm is balanced with the magnetic field between coil 2 and the diaphragm. So there is a gap produced depending on the position of the diaphragm and each coil. This produces an AC output voltage.

Particular benefits provided by the variable reluctance pressure transducer include:

  • Measurement of very low pressures
  • Low power consumption
  • Wet/Wet differential measurements
  • Suited for high levels of vibration
  • Fast Dynamic Response

The variable reluctance transducers we offer at Validyne Engineering have a track record of accuracy and reliability in various environments. Allow our team to guide you in selecting the best pressure transducer(s) for your particular application.

A brief review of the PS309 and PS409 Pressure Manometers offered by Validyne Engineering

Both the PS309 and PS409 pressure manometers offered by Validyne Engineering feature lightweight construction, absolute differential, and gauge ranges of 0.08 psi to 3200 psi FS. All surfaces that contact pressure media are 410 stainless steel in both units. There are, however, some differences. Let’s briefly review each manometer and cover some features and capabilities of each.

PS309 Pressure Manometer

pressure manometerAs a totally self-contained pressure manometer, the PS309 is a portable unit that comes in gauge, absolute, and differential ranges. It offers a front panel liquid crystal digital display, as well as a 2 VDC analog output designed for remote recording or control.

For portable operations, the PS309 features a 3.5 digit LCD and battery pack (6-1.5V penlight cells), a solid-state electronics module, and integrated VR transducer. All surfaces that contact the pressure media are made from all corrosion resistant materials. It has ultra-low volumetric displacement with full-scale pressure exertion as well as very low internal cavity volumes.

The unit includes the capacity for individual meter scaling adjustments and, through easy front panel adjustment, decimal point selection for the display is user-programmable.

An optional feature of the PS309 is switch-selected Pressure and Flow operating modes. Each mode offers separate 2 VDC analog outputs and individual scaling adjustments.

PS409 Pressure Manometer

pressure manometerDesigned for installation in rack-mount panels in laboratory and industrial applications, the PS409 pressure manometer we offer at Validyne Engineering is a self-contained digital indicator and sensor. It is ideal where accurate low-pressure readings are needed. The unit includes an integral VR transducer and easy-to-read 0.5 inch high x 4.5 digit LED display. It also offers a temperature range of 0ºF to 160ºF.

Digital Indicator of the PS409

The digital indicator offers read-outs in 3 different engineering units: PSI, In. H2O and In. Hg, which can be selected by the user from front panel buttons. Separate internal calibration adjustments for analog output and meter display are also featured.

Pressure Transducer for the PS409

Available in gauge, absolute, and differential versions, the PS409 is built of corrosion-resistant materials at points of contact with pressure media. The PS409 is available in 23 pressure ranges, from 0.08 to 3200 psi FS. The unit can also deliver 5 VDC analog output for remote display, control or recording purposes.

Applications of the PS409 include pneumatic systems, test cell and test panel applications, engine and vehicle test stands, pumps and hydraulic systems, process/product control testing, gas distribution, emission testing, and fuel pressure.

university lab

Introducing the Validyne University Website

Validyne invites you to a closer look at one of our latest projects, the University Validyne website, which will enable us to enhance our engineering program and better serve our customers by partnering with university lab programs. Learn more about a history of partnerships with universities, as well as have the chance to see first hard which products and services are currently popular in the university labs.

About Validyne Website

 

Validyne Engineering is a leading manufacturer of variable reluctance pressure transducers as well as pressure sensors and data acquisition solutions. The University Validyne website will enable our customers in the educational fields to learn more about our impact on the learning environment.

Validyne pressure transducers, pressure sensors, and signal conditioning have been in use in laboratories for graduate and undergraduate students since 1970. Our full scale pressure range of transducers, sensors and vital data acquisition systems are in use in a variety of learning environments including:

  • Fluid Mechanics
  • Biocric Research
  • Mechanical Engineering
  • Civil and Environmental Engineering
  • Mechanical and Aerospace Engineering
  • Geotechnical Engineering

Our products are being used in research labs for numerous case studies and research projects such as:

  • Cryopreservation of human pulmonary tissues
  • Tubing Networks for Full Scale Pressure Measurements
  • Mechanics of Fluids and Transport Processes / Aerodynamics Lab
  • Wind Tunnels

Programs to Meet Changing Needs

Pressure measurements are constantly changing and, in order to keep up, university laboratories need access to pressure transducers whose range can be changed. This is the best choice for laboratories.

Our data acquisition products provide flexibility and accept any sensor inputs including strain gages, Validyne pressure transducers, thermocouples, RTDs, LVDTs, resistances and DC volts in any mix or combination. These products combined with our Easy Sense software and USB interfaces, provide conditioning that can be quickly programmed to meet changing needs.

At Validyne Engineering we are proud to offer our superior products and services to university laboratories. Together with universities, we are building on a future for the engineering field.

university lab