How does a Namur sensor work?
Answer: A NAMUR sensor is a 2-wire proximity sensor that is usually powered by 8 VDC. When the sensor detects the target, the current flow through the sensor drops to less than 1.2 mA. When the target moves away from the sensor and is not detected, the current flow increases to above 2.1 mA.
What is NAMUR output sensor?
Proximity sensors and encoders can have NAMUR output. NAMUR is a type of sensor output that gives an on or off indication. A NAMUR sensor is a non-amplified sensor that supplies two different signal levels depending upon switch state. These signal levels are low-level current.
What is NAMUR standard?
NAMUR is an acronym for the User Association of Automation Technology in Process Industries, which provides an industry-wide standard for automated valve technology.
How does a 2 wire sensor work?
2 wire sensor is basically a loop-powered device without requiring a separate supply voltage (the source voltage is supplied to the destination device) whereas the 3 wire sensor is a self-powered device meaning, you supply source voltage to the sensor and it can drive a 4-20 ma input device directly without the …
What is NAMUR circuit?
A NAMUR proximity sensor has a switching circuit similar to a typical proximity sensor, but instead of making and breaking an external circuit, the switching circuit is used to change the output current flow by altering an internal resistor network.
What is the difference between NPN and PNP proximity sensors?
PNP sensors produce a positive output to your industrial controls input, while NPN sensors produce a negative signal during an “on” state. NPN, or “sinking” output sensors, work in the opposite way, sinking ground voltage to an input when it’s on.
Which sensor is used in hazardous regions?
Accelerometers approved for use in hazardous areas are certified by several different international programs (ATEX, CSA/ETL and IECEx) as well as several country-specific certifications. It is common to require these certifications when installing sensors in a potentially explosive area.
Where is a NAMUR sensor used?
NAMUR proximity sensors are used in classified hazardous location areas that have explosive gas, dust, or fibers present.
What is NAMUR mounting?
NAMUR mount means the solenoid can be mounted directly to valve actuators. Designed for double acting or spring return actuators.
How do you wire a 2 wire sensor?
Connecting the 2-wire sensor can be done by merely connecting the blue wire to the input and the brown wire to the 24V source. The process is the same for replacing a NPN 3-wire sensor. In this case you would just connect the brown wire to the input and the blue wire to the ground of your power supply.
What are NAMUR signals?
NAMUR is a signaling standard, used primarily on proximity and limit switch devices. It outputs a current signal depending on the state of the switch. The switching spec is >2.1mA (typically but not always for NC) and <1.2mA for the opposite switch state. There is a 0.9mA deadband for noise immunity.
What is the current level of a Namur sensor?
The specification for NAMUR output sensors is typically 5 mA of current at 8.2 V, while standard 2-wire DC sensors operate at current levels up to 100 mA in the range of 5 … 60 V. Voltage drops and off-state currents are also different when a target is detected.
How is a Namur proximity sensor ensure safety?
NAMUR proximity sensors are used in classified hazardous location areas that have explosive gas, dust, or fibers present. NAMUR proximity sensors are considered Intrinsically Safe. So how does a NAMUR proximity sensor ensure safety?
Where is the Namur sensor on a cr2050?
The NG500A NAMUR sensor would be wired to one of the eight digital inputs on the CR2050 I/O module. The voltage supply is common for each of four pairs of inputs, so make sure inputs are wired to the I/O connectors properly.
What does the Namur stand for in German?
The term “ NAMUR ” is an acronym for a very long German description: “ N ormen a rbeitsgemeinschaft für M ess- u nd R egeltechnik in der chemischen Industrie” If you are interested in the exact description and its English translation, you can find it easily on the internet.