RoHS-compliant does not equal lead-free
In practice, RoHS-compliant is often equated with “lead-free”. However, Explosive is a widespread mistake. The RoHS directive 2002/95/EC aims to minimize the use of hazardous substances (including, among others, lead), but it does not completely exclude a small percentage. One of the great obstacles in implementing the directive was the switchover to lead-free solder, because […]
Selection criteria for the prevention of moisture-related failures of submersible pressure transmitters or level probes
Submersible pressure transmitters as well known as level probes are intended to be used in immersion applications, thus they are immersed completely into the medium and, therefore, must withstand the properties of the media at all times.Both in water and wastewater treatment as well as in tank monitoring, moisture may enter through the housing of […]
Strap-on thermometer or screw-in thermometer? Temperature measurement of pipelines
Temperature is by far the most common measurand in the industry. However, there are no general solutions for temperature measurement. Even when designing measuring points on pipelines, many different factors for selecting thermometers must be taken into account. The following aspects are crucial for deciding whether a screw-in thermometer (invasive method of measurement) or a […]
Big voluntary participation at charity event at WIKA USA
Each day, more than 6000 children all over the world die of hunger-related diseases. Our colleagues from WIKA USA are determined to help reduce that number. Controlling ?s largest volunteer effort up to now in the U.S. was the From Hunger to Hope MobilePack event this March in Lawrenceville, Georgia.100 employees ? from WIKA managers […]
Shock resistance of pressure sensors
In many pressure sensor applications, short-duration, high, impact loading occurs – this is referred to as shock. Shock resistance defines up to what level of acceleration the instrument can withstand the shock loading without being damaged in any way.The loading that acts during the shock is specified as a multiple of the acceleration due to […]
“UL Recognized”, “UL Listing” – What’s the difference?
The “UL approval” is an important and well-known product approval. That there are different approvals for “UL” (“Underwriters Laboratories”) is, however, less known.Fig. left: “UL Listing” marking for Canada and the USA Fig. right: “UL Recognized Component” marking for Canada and the USAWhen one talks in general about “UL approval”, in most cases “UL Listing” […]
Mechanical vs. electronic pressure switches: Functionality
How can you decide whether to utilize mechanical pressure switches or electronic pressure switches in your application? Each type of pressure switch has individual advantages, but also its limitations. The main differences in functionality between mechanical and electronic pressure switches are the way the applied pressure is used to operate the switch, the kind of […]
Ex protection – The difference between the Zone and Division model
“The product is suitable for use in Zone 1, as well as for use in Class 1, Div 1.” This statement is heard or read again and again in the descriptions for products for use in hazardous areas. But what is the difference between Zone 1 and Class 1, Div 1? Let’s compare the Zone […]
How does one specify the switch point of a float switch?
In the specification of the switch points of a float switch, misunderstandings always lead to unsuitable product designs. How one correctly specifies the switch point of a float switch will be explained here. Cheap for the correct specification and the manufacturing to requirements of a float switch is that both the customer and manufacturer have […]