Saying from namur valve to a valve specialist. And the first thing he would think of is the interface used to connect the solenoid to the actuator. And to turn the boxes or locator to rotary pneumatic drive.
Refer to namur valve for the control and the first thing you need to keep in mind is intrinsic safety techniques.
Both are true. A typical auto-assembly valve for on / off service consists of a valve (rotary or linear), actuator, position sensor and solenoid. An automatic valve for service control adds a positioner valve but removes the solenoid.
Selection of components needed in assembly depends on the application of the service. And the area (environment) where the assembly will be installed.
By risk, we mention the risk of an explosion occurring when an air mixture is capable of igniting with gas, vapor, or dust. The energy to burn this mixture can come from a variety of sources. Including electrical or mechanical sparks generated, thermal effects, static electricity, electromagnetic radiation, or even lightning strikes.
Electrical equipment used in hazardous areas must be unlikely to initiate an explosion. Or be enclosed in an approved heavy enclosure and will have an explosion. A self-contained device can not create an explosion. Therefore, it prevents an explosion from occurring.
Prevention is always a preferable option rather than a deterrent when choosing hazardous location devices.
Namur valve compliant self-safety sensor that prevents the explosion. And can operate continuously at a hazardous location.
A namur valve sensor is combined with a barrier that limits the electrical power available to the sensor to the degree of ignition. The barrier provides enough power for the correct operating sensor but not enough to trigger the ignition through heat generation or by creating a spark above the safety threshold. When the sensor detects the valve position, the barrier amplifies the output signal and then starts closing a relay or electronic signal. This output is usually put into a PLC or analog control / monitoring system.
By using the NAMUR sensor to detect valve positions for process valves in hazardous locations, you will benefit in two ways – proven explosion proof and removal of a waste bin. set
The NAMUR sensor addresses the same applications as inductive and capacitive sensors. Or rotary encoders but is safe to use in hazardous areas. NAMUR’s output sensors are ideal for applications where the presence of a gas, vapor, dust or volatile fiber creates a hazard.
To prevent explosions in hazardous areas, these sensors protect the circuit by operating at 8.2 V and below 5 mA. These levels prevent the storage device from getting enough energy to start blasting. The NAMUR sensor is connected to an isolation amplifier, limiting the current and voltage to the sensor and amplifying the signal back.
For more information on how the sensors work, read our blog post “Why do I use the NAMUR Output Sensor?”
Does your application require a namur valve sensor? To help you decide, here are some of the applications that sensors commonly solve:
Sensors used in the manufacture of pharmaceuticals. Since volatile chemicals used in these processes create hazardous areas, a NAMUR sensor is required. For example, in the tank, the NAMUR sensor monitors the filling level. Capacitive sensors are used here as they can detect non-conductive eyeglasses. Another popular application is the use of inductive namur valve sensors to detect presence in the decontamination chamber – for example, ensuring that the door is fully closed.
In the manufacture of paints, materials including pigments, solvents, and other chemicals are processed and mixed. Many of these chemicals are volatile and can emit flammable gases and vapors. Accordingly, the conveyor system moves the paint tank through the loading and sealing process using the inductive NAMUR sensor to detect the presence of the can. In the manufacture of cars, the NAMUR inductive sensors are used in the paint chambers to ensure that the doors are fully closed during the paint.
The NAMUR sensor is well suited for measuring applications. Common measurement applications for NAMUR instruments include the use of flow meters to measure gas, gear counts on gears, detection of one meter in open or closed positions, and tracking rotation. The situation also appears in the measurement industry where high switching frequencies are required. The NAMUR sensor meets this requirement because it only contains one coil and vibration. Measurement applications often use the namur valve sensor inductive due to the metal components of the NAMUR hazardous area rotary encoder which is also used in measurement applications.
HVAC systems provide buildings with heating, ventilation, and air conditioning through the pipeline. A fire extinguishing system is carried out in the duct to detect the accumulation of flammable dust. The NAMEC sensor monitors the thickness of the dust layer and activates the output if there is too much dust.
The petroleum industry is highly involved in volatile materials, so namur valve products are found naturally in the industry. Applications include presence testing for offshore and inshore drilling platforms in locations such as deck, top drive, pipeline, tractor, and waterproofing. These applications use NAMUR sensors inductors because the target is metal. Refineries also use NAMUR sensors to detect levels.
Vapor emitted from a chemical mixture creates a danger of explosion in liquid production. For example, to make windscreen washers, glycol, water, and other substances are combined. The NAMUR sensor is used to monitor the levels in the tank. In this case, the NAMUR sensor can control fluid levels through eyeglasses.
Powder is dangerous in a wide range of industrial automation applications. In the production of airbags, the dough loading machinery into the initial components lead to inflation of airbags. The namur valve sensor is used here due to the powder’s ability to burn.
The sensor provides feedback on levels and strokes on the press and processing machines. High temperatures and pressures are common during industrial processes. Combining these conditions with volatile materials leads to the need for NAMUR sensors.
This is a small selection of applications called namur valve output sensors and encoders. Do you have an application that may need a NAMUR sensor?