Sensors are often specified based on the sensing distance and housing geometry. But, the user must also be aware of any mounting restrictions that might apply to the specific sensor chosen for the application.

 

Various types of sensors require different considerations when being mounted to a bracket or machine component, so special attention should be given to the mounting conditions which may restrict the close proximity of any non-target metal in the area around the sensor mounting zone. The effect of the surrounding metal, located within the electromagnetic field generated by the sensor, may result in unintended consequences for the operation of the equipment. Depending upon the sensor, this metal may cause pre-damping of the sensor oscillator resulting in: false triggering, temperature instability, or sensor latch-on effects.

 

DEFINITIONS:

Flush mount = embeddable mounting = shielded sensor
Sensors that incorporate an electromagnetic shield positioned around the inductive coil that will minimize the effect of surrounding metal. These sensors normally have the widest range of mounting options and the best immunity to mutual interference of nearby sensors.

Non-flush mount = non-embeddable mounting = unshielded sensor
Sensors that have no electromagnetic shielding present around the inductive coil system and therefore are strongly affected by surrounding metal. These sensors normally have the longest sensing ranges, but require the largest amount of metal-free area around the mounting zone.

Semi-flush mount = quasi-embeddable
Sensors that have partial electromagnetic shielding present around the inductive coil. This partial shielding will help minimize the effect of surrounding metal. These sensors can provide longer range than flush-mount sensors for the same housing size, but have some mounting restrictions that limit the metal allowed in the mounting area.

Notes:
1.    Red area indicates mounting metal-free zone required by different sensor types.
2.    The unshielded sensors have a wider radiated magnetic field.
3.    Flux lines have a higher field density nearer the coil system.
4.    Mounting metal closer to the coil will have a more significant affect on pre-damping.

 

 

 

MOUNTING CONDITIONS:

Shielded sensors

Because their construction limits the electromagnetic flux path, they allow the user to mount the sensor flush with the mounting surface. For cylindrical sensors this means having the mounting surface even with the sensing face; for cubical sensors the mounting surface can extend up to the face of the sensor.
Note: Even flush-mount sensors may be affected, pre-dampened, if the metal extends past the sensor face. For cubical sensors the mounting, metal-free zone includes the area on all sides of the sensor.

Embeddable sensor mounting conditions
Mounting metal must not extend beyond the sensing face or pre-damping of the sensor will occur.
·    Cylindrical sensor face must not be recessed into metal
·    Cubical sensor must not have metal beyond sensing face of on any of the four sides of

     the device.

 

Unshielded sensors

Because of their construction, they allow the electromagnetic flux path to freely radiate from the coil system area. This requires that strict mounting conditions be observed with regard to metal in the mounting area. For these sensors it means having the mounting surface below or out of the range of the radiated field pattern.
Note: Non-flush mount sensors are very sensitive to the metal near the sensor mounting zone because as stated earlier, the flux density is highest near the coil system.

Non-embeddable sensor mounting conditions
·    Mounting metal or mounting fasteners must not be in the metal-free zone
·    For cylindrical, unshielded sensors the typical metal-free zone extends to an area of two

     times the sensing range of the device.

 

 

Quasi-embeddable or semi-flush mountable, what does it mean?
Standard embeddable/flush-mount sensors can be mounted so that the sensing face is flush to the mounting surface or fastener nut. Semi-flush mounting requires that the sensor face be extended by a small amount beyond the metal mounting surface or fastener nut as shown below.

Note: These sensors provide a longer sensing range with the added benefit of a full sensor housing length providing side impact protection near the sensor face.

Quasi-embeddable sensor mounting conditions
Mounting metal or mounting fasteners must not be in the metal-free zone, otherwise pre-damping or sensor activation can occur.

 

In conclusion, selection of the appropriate sensor for the application should not only include evaluation of the sensor housing, sensing range, and electrical output type, but consideration should also be given to the mounting environment for the sensor.  Customers should always check the appropriate catalogue or data sheet when concerned about having mounting related brackets or other metal in the mounting zone.

 

 

 

Wherever there is a need for reserve power, EnerSys offers the perfect standby battery solution.

 

EnerSys is the global leader in energy storage and first choice for customers worldwide. Their extensive range of quality products is backed by more than one hundred years experience of battery manufacturing and innovative technology.

EnerSys operates over twenty manufacturing and assembly plants worldwide and has a strong marketing presence in more than 100 countries.

As the world's largest industrial battery manufacturer, EnerSys is at the forefront of power storage technology, delivering effective solutions for a huge range of applications.

Their world-renowned PowerSafe, DataSafe, Genesis, Varta and Odyssey brands are used in telecommunications, IT, utilities, uninterruptible power supplies, general electronics and speciality applications

 

                                            

Honeywell sets the industry standard for hazardous location applications. 
 

Available in a variety of styles, MICRO SWITCHTM hazardous location switches feature UL, CSA, ATEX, and IEC Ex certifications. Offered with a variety of heads and non-sparking actuators, Honeywell's hazardous location switch product line includes smaller sizes, lower-cost options, and analog outputs.

 

When conditions are hazardous and performance is critical, Honeywell Sensing and Control delivers exceptional performance.

• Designed specifically for dangerous indoor or outdoor locations
• Superior reliability and repeatability
• Explosion-proof design contains flame path to contain and cool escaping hot gases
• UL, CSA, ATEX, and IEC Ex certifications
• O-ring seals render switches weather-proof, water-tight, and dust-tight

 

      

   

 

 For more information, Click Here.

 

 www.honeywell.com

 

 

Stellar Technology designs and manufactures a comprehensive offering of pressure, load/force, and temperature sensors for the aerospace industry.

 

The products meet the demanding reliability and performance requirements of the military, commercial, and general aviation sectors. Stellar space rated pressure transducers have been used on numerous shuttle, satellite, and launch vehicle applications. Their engineering expertise, application experience, and manufacturing capabilities provide many standard or custom-engineered sensor solutions.

 

 

                

 

 

 

 

  

General Purpose                    Qualification Testing                     Engine/Propulsion

- Components testing              - Flight simulators                       - Jet engine test stands

- Systems testing                   - Iron Bird testing                        - Rocket engine testing

- Materials testing                   - APU testing                             - Thrust tests

- Service support testing          - Hydraulic systems                    - Fuel management

                                             - Linear/Rotary actuators             - Engine diagnostics

 

Space Qualified                     Primary Systems                         Aircraft Assembly

- Satellite                              - Landing gear design                   - Airframe ass'y and test

- Shuttle                                - Fuselage testing                       - Jack stand force

- International Space              - Cargo deployment                      - Fastening systems

  Station                               - Actuator systems test                - Metering and dispensing

- Launch Vehicles                                                                      of fluids and adhesives

                                                                                              - Weld integrity tests

 

            

  

 

 For more information, Click Here.

 

 

 
Some batteries provide enormous cranking power. Others, deep cycle reserve power. The revolutionary ODYSSEY® battery is designed to do both.

 

How is this possible? The answer begins with flat plates made of 99.99% pure virgin lead - not lead alloy. Pure lead plates can be made thinner, so we can fit more of them in the battery. More ODYSSEY battery plates mean more plate surface area. And that means more power - twice as much as conventional batteries. In fact, ODYSSEY batteries are capable of providing engine cranking pulses in excess of 2250 amps for 5 seconds - double to triple that of equally sized conventional batteries, even at very low temperatures. And they can handle 400 charge-discharge cycles to 80% depth of discharge.

This extreme combination of power and performance makes ODYSSEY batteries perfect for a range of applications including automotive/LTV, marine, commercial, and power sports. 
 

 

Pepperl+Fuchs introduces the new VDM28 Distance Measurement Sensors with Pulse Ranging Technology (PRT). These cost-effective sensors provide distance measurements from 200 mm up to 8 m with repeatable accuracy of <5 mm. They also provide a response time as fast as 10 ms and a resolution of 1 mm, regardless of target surface. Pulse Ranging Technology is an advanced method of distance measurement that provides more precise measurement than phase correlation and time-of-flight techniques.

 

At just 88 mm x 26 mm x 54 mm, VDM28 Distance Measurement Sensors are the industry's most compact PRT-based sensors. They feature a visible red laser light source with a small, well-defined light spot for quick, accurate alignment. These sensors offer a simple one-touch "teach" process, are immune to cross-talk, and provide reliable operation in temperatures ranging from -22 °F up to 122 °F. They operate at 10-30 VDC with maximum load current of 100 mA, and feature two 4-in-1 discrete outputs. Available options include a 4-20 mA analog output, as well as an IO-Link of Com 2 interface.

 

Unlike phase correlation methodology that has limited range and is relatively dependent on good, stable environmental conditions for accurate and repeatable measurements, Pulse Ranging Technology can provide highly reliable and repeatable distance measurements to over 3200 feet with little concern for ambient environmental conditions.

With PRT, short pulses of light are emitted from the sensor, reflected off the target, and received back to the sensor. This procedure is repeated up to 250,000 times per second. The power of a single pulse is up to one thousand times more intense than the pulses generated by sensors that emit permanent light beams. As a result, PRT-based sensors deliver far more accurate, reliable and repeatable results irrespective of target surface or color or high ambient light.

VDM28 sensors feature the same housing as Pepperl+Fuchs popular, time-tested and field-proven Series 28 family of photoelectric sensors for familiarity of use, and installation compatibility with other industry standard sensors. They are ideally suited for use in applications where standard background suppression sensors reach their maximum range, or where a long-range sensor with a small light spot is required.

       

         

 

 

For more information, Click Here.

http://www.am.pepperl-fuchs.com/

 

 

 

Jim Panagakis   Tel (514) 894-6077   jimp@xtronics.ca

Martin Colligan   Tel (514) 247-7725  martinc@xtronics.ca