Friday, January 30, 2015

Excellent Control Valve Design Information in TrimTeck OpGL Product Catalog

Here is a good, handy online version of the TrimTeck globe control valve catalog. Its full of excellent control valve selection criteria and is illustrated quite well, showing body styles, packing styles, bonnet design, flow paths, end connections, and seat designs.

Thursday, January 29, 2015

In the Market for an Industrial Annunciator? Here's a Guide to Help

industrial annumnciators
Alarms and Annunciators
Annunciators are found in industrial control rooms, boiler rooms, power substations and just about any type of process control operations room where the process conditions need to be closely monitored and where constant status indication is important.

Here is an outline for the primary selection criteria for an integrated logic alarm annunciator:

  • Panel mount
  • Surface mount
  • Rack mount
Alarm Points
  • How many alarm points do you have? Annunciators break down alarm points by "cell" and you call out the number of cells based on the layout desired. For instance, a 1x4 would be 1 annunciator cell tall by 4 cells wide. 
Pushbuttons (and Location)
  • Occupying bottom right module cell space
  • On the bottom right trim of the chassis
  • Located remotely
The Available Panel, Box or Cabinet Space Available
  • Dictates how alarm points and pushbuttons are arranged.
Networkable or Stand-alone?

Configuration via software?

Event recording?

Do you need electrical outputs?
  • Audible and visual signals: horn, beacon, bell
  • Common Trouble Alarm (CTA) Relay: notification of any alarm within the system (commonly used for remote beacon or dial-up) 
  • Group CTA functions: for critical and noncritical groups 
  • Auxiliary Contact Repeat Relay: individual repeater output per input 
  • Reflash Alarm Relay: alarm counter 

Field contact voltage?

Source voltage?

Alarm type grouping? 

For a detailed annunciator selection guide (courtesy of RONAN Engineering) visit this annunciator selection guide link.

Tuesday, January 27, 2015

Selecting Variable Area Flow Meters for Process Measurement

Partially reprinted from a white paper by
Jim Dillon, Global VA Product Manager, Brooks Instrument
To download the entire white paper visit here.
VA meter
Variable Area Flow Meter
(courtesy of Brooks Instrument)
Many industrial processes require reliable, accurate and repeatable gas and liquid flow measurement and control. Variable area (VA) meters are extremely versatile in this arena. They are ideal for monitoring process flow, instrument impulse flow lines, purge gas flows, flows of flushing or cooling media, make-up flows, and reactor gas and liquid feeds.

VA meters are an inexpensive flow-metering device available for a variety of industrial applications. VA meters with indicator only are still the norm; however, more VA meters are being specified with options such as flow alarms and analog output transmitters. This

is happening for a couple of reasons. Monitoring a process remotely provides better control because the entire flow line can be monitored. Using a VA meter with an analog output transmitter allows one person to monitor several process lines remotely.

Another technique for monitoring a flow line is a VA meter with a flow switch. The switch can be set to trigger at a given flow rate. When the flow rate reaches the set point, a signal could cause a valve to close or open. A pump could be turned on or off or a simple light or some other signal could be activated.

The other major trend in VA meters is the transition from glass tube rotameters to metal tube rotameters. Metal tube meters are more durable and require less maintenance. Plus, if a glass tube breaks, not only is there the expense of the glass tube, there is downtime and maintenance technician time to consider, too.

Unlike other flow meters, VA meters will respond like a canary in a coal mine when air quality changes. If process conditions change, they usually impact flow rate. For example, if the back pressure changes on gas flows, the flow rate will change. For this reason, it’s necessary for engineers to take several factors into consideration when specifying a VA meter for their applications:
  • Normal and maximum operating temperature and pressure 
  • Flow rate — minimum, maximum and normal 
  • Reference conditions and volumetric flow type (normal, standard or other) if measuring a gas 
  • Fluid density and viscosity 
  • Accuracy 
  • Global certifications

Wednesday, January 21, 2015

Refractory Metallization

refractory metallization
Fabricated by refractory metallization
High-temperature refractory metallization is the only solution for some packaging applications. Tungsten and Moly-Manganese metallizations have higher adhesion to the substrate than thick-film metallization. This makes it the ideal process for hermetic packages, brazed lead frames and packages requiring high operating temperatures. These metals can be screen printed, sprayed or hand-painted onto alumina oxide or beryllium oxide substrates. Patterns can be plated with gold and nickel or gold alone. Once gold plated, these surfaces are solder-able and wire bond-able with aluminum or gold wire.

Batch furnaces are ideal for accurate brazing of small quantities and large. Kovar, stainless steel, copper and copper/tungsten as well as many other metals can be brazed to metallized ceramic. When the application requires, step brazing can be performed to combine several sub-assemblies into the final product.

For more information on hi-temperature refractory metallization contact:

Belilove Company Engineers
P.O. Box 55936
21060 Corsair Blvd
Hayward, CA 94545
Phone: (510) 274-1990
Fax: (510) 274-1999

Monday, January 19, 2015

Thermocouple Basics - Wire Type, Connectors, Construction

Industrial thermocouples, as the temperature sensor in a thermal system, are explained in the video below.

Seebeck Effect
Seebeck Effect
(image courtesy of Wikipedia)
Thermocouple "Types", based upon standardized color designations is discussed, as well as thermocouple connectors, polarity and some aspects of construction (such as grounded vs. ungrounded vs. open tip).

Thermocouples are a fairly accurate, economic temperature sensor used in many industrial applications. They operate on the "Seebeck Effect" which is the phenomena of dissimilar metal conductors producing a measurable voltage difference between two substances.

Thermocouples are used widely in industrial thermal system design in industries such as power generation, primary metals, pulp and paper, petro-chemical, and OEM equipment.

For more information contact:
Belilove Company Engineers
21060 Corsair Blvd
Hayward, CA 94545
Phone: (510) 274-1990
Fax: (510) 274-1999

Tuesday, January 13, 2015

Flow Control Product Guide

The Brooks Instrument 2014 product Guide, which includes the following flow instrumentation:
  • Thermal Mass Flow Controllers and Meters 
  • Multi-Purpose Mass Flow Controllers and Meters  
  • Ultra-High Purity Mass Flow Controllers and Meters
  • Variable Area Flow Meters 
  • Low-Flow Glass Tube Variable Area Meters 
  • Armored Metal Tube Variable Area Meters  
  • High-Flow Glass Tube Variable Area Meters  
  • Plastic Tube Variable Area Meters  
  • Precision Valves, Controllers, Switches and Indicators
  • Pressure and Vacuum Products  
  • Pressure/Vacuum Controllers  
  • Pressure Transducers and Transmitters 
  • Pressure Gauges, Regulators and Displays  
  • Vacuum Measurement  
  • Direct Liquid Injection Vaporizers 
  • Coriolis Mass Flow Controllers and Meters  
  • Secondary Electronics and Software Tools 
  • Customized Systems and Solutions 
  • Level Measurement  
  • Point Level Measurement 
  • Liquid Mass Flow Controllers and Oval Gear Meters

Sunday, January 4, 2015

Thick Film Heating Elements: An Excellent Choice for Custom OEM Thermal Designs

custom thick film heaters
Custom Thick Film
Heaters and Circuits
Thick film heating elements, originally designed for the automotive and military industries, are manufactured by depositing several layers of conductor, resistors and dielectric on to an insulator via a screen printing process. The dielectric is normally some type of glass or ceramic and provides electrical insulation for the screen printed heating tracks.

Thick film heating elements are almost always custom designed for OEM applications. They can be designed in all shapes and sizes, and have an ability to provide very high watt densities with excellent controllability. The largest markets for these heating elements are appliances, analytical instruments, automotive, semi-conductor, medical device, scientific and military equipment.

Because of their inherent low mass, and their ability to carry high watt densities, thick film heaters are very efficient and are an excellent choice where a rapid heat-up (response) is required.

Advantages of thick film heaters are:
  • Watt-Density up to 175 watts per sq. in. 
  • Operating Temperature to 500 deg C
  • Low Profile
  • Excellent Control
  • Very uniform heat profile
  • Temperature sensors can be included on the heater
  • Custom heating profiles
  • Very rapid heater response
  • Vibration and shock resistant
  • Very customizable shapes, sizes and wattages