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Pepperl+Fuchs Blog

Ask an Expert Industrial Sensors - Episode 20

Posted by John Appleson on Thu, Sep 01, 2016

This episode of Ask an Expert for industrial sensors examines and provides answers to interesting sensing questions we've received from customers just like you. We explore and answer these questions:

  1. Can the inductive sensor NBB1.5-5GM25-E2-V3 detect non-ferrous metals? How does that affect the sensing range?
  2. An inductive sensor won't read above 500 rpm. What's the problem here?
  3. What does the fault error F-4 mean on an AS-Interface network?
  4. Does the MTT-6000 RFID reader need an antenna or read head?
  5. Do you have a capacitive sensor for high temperatures, about 150 °C?
Ask an Expert from Pepperl+Fuchs your industrial automation questions

Feel free to ask us your sensing questions, and we'll do our best to reply with the whys and hows of a particular solution.

 

 

Transcript:

John: Welcome to Ask an Expert! Hi, this is John Appleson, Marketing Manager with Pepperl+Fuchs. Today, I'm joined by Zach Steck. Zach works as an Application Engineer here at Pepperl+Fuchs. So welcome, Zach and thanks for being here!

Zach: Hi John, thanks for asking me.

John: The first question asks about the inductive proximity sensor NBB1.5-5GM25-E2-V3. The customer would like to know if it's able to detect non-ferrous metals such as aluminum, and if so, would it affect the sensing distance?

Zach: This inductive sensor is capable of detecting non-ferrous metals, but it would be at a reduced range. If you look at the data sheet, you will see a reduction factor listed for some common non-ferrous metals such as aluminum and copper. To get the expected range, you would multiply the reduction factor by the specified range on the data sheet. In this case, the 1.5 millimeters.

John: This customer replaced an NJ6-22-N-388 10 meter inductive sensor with an NJ10-30GM-N inductive sensor, but now it won't read above 500 rpm. Zach, what went wrong in this case?

Zach: A quick comparison of these two inductive proximity sensors reveals that the switching frequency of the NJ6-22-N-388 sensor is significantly higher than the NJ10-30GM-N inductive sensor. 2000 Hz vs. 300 Hz. For speed applications, switching frequency is the maximum number of times a sensor can change state, represented in Hz. Generally, 300 Hz should be plenty high enough to function at 500 rpm, so we would also need to review the setup. Several factors can affect the switching frequency in a negative way, including the number of targets per revolution, spacing of the targets, the size of the target, and the distance from the sensor to the target.

John: Zach, a customer replaced a VAA-4EA-G4-ZE-/E2 AS-Interface module, addressed it, and now it shows a fault error of F-4. He stated that the module that he took off was addressed as node 6. Any idea what happened?

Zach: With the handheld addressing device, the F-4 error indicates that the target address is already occupied. It's recommended to assign a different address to that active slave. In this case, you'd want to ensure that the slave is pre-addressed as node 6 before placing it on the network.

John: For this next application, the customer would like to read a truck ID, and wants to use the MTT-6000 industrial RFID reader. He needs to know what else is required to connect to a CompactLogix™ controller, and what antenna and tags it will accept. He needs to report the RFID tag to his PLC. Do we offer these tags?

Zach: The MTT-6000 is a standalone RFID reader, so it does not require an additional antenna or read head. There are four RFID tag options available. Two read-only tags and two read-write RFID tags. All of them are fairly large in size and battery powered. To connect this device to a CompactLogix controller, it would also require an Ethernet converter such as our model RTS-UP-1. This converts Ethernet to EtherNet/IP. There is an in-depth guide available on our website, which goes through setting up the RTS-UP-1 with the MTT-6000.

John: OK, last question. A customer is trying to find a sensor similar to the CCN15-30GS60-E2 capacitive sensor, but for use in a 150 °C high-temperature application. Zach, what can we offer?

Zach: Unfortunately, we do not offer any capacitive sensors suitable for that temperature. Our only options for 150 °C would be an inductive proximity sensor or a fiber optic solution.  

John: Well, that concludes this segment of Ask an Expert. I'd like to thank Zach for joining me today, and thank our audience as well.

Questions about Industrial Sensors?  Ask an Expert!

Topics: Inductive Sensors, Capacitive Sensors, AS-Interface, Ask an Expert, RFID

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