Pepperl+Fuchs Blog

Ask an Expert Industrial Sensors - Episode 7

Posted by John Appleson on Thu, Feb 05, 2015

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. I want to use a NBB1.5-8GM50-A2-V1 in a safety-related circuit. This circuit will overlap a safety light curtain. I want to use this sensor to monitor the safe position of a pneumatic slice when the light curtain is broken during the loading of a part. The prox signals will be monitored twice per cycle to ensure proper diagnostic coverage. Is it possible to wire two or more of these inductive sensors in a series if I need to monitor the position of more than one device?

2. Does Pepperl+Fuchs have a proximity sensor with a variable output where the output increases as the target cam moves away or toward the target area? The housing has a limitation of 10 mm x 8 cm with a sensing range of 1/16 in. to 1/4 in.

3. An NJ1.5-8GM-N sensor is used in a robot wrist tool changer. The tool is in a harsh environment. The cable is covered with a solvent-proof tube. Is this sensor available with a more durable jacket than PVC? Perhaps a jacket made from nylon impregnated polyurethane?

4. I am wondering what the sensing "cone" angle is on the ultrasonic sensor UB250-F12-U-V15. I have an application that needs to sense levels of liquid in a pan. The sensor would have to be placed close to the wall of the pan. How far away would the sensor need to be from the wall for a given sensing depth?

Ask an Expert about inductive proximity sensorsFeel free to ask us your sensing questions, and we'll do our best to reply with the whys and hows of a particular solution.


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

Casey: Hi John, thanks for asking me.

John: Ok Casey, let's get started. The first question asks about wiring two or more NBB1.5-8GM50-A2-V1 inductive sensors in series, to monitor the position of more than one device in a safety-related circuit. Casey, is this a good idea?

Casey: If it is strictly for diagnostic purposes, then yes. This sensor is not safety-rated, so we do not recommend it for use in meeting safety conditions for a given application. However, it can be used to monitor the position of a device after all safety requirements are met.

John: Casey, here's another inductive sensor question. This customer wants to know if we offer a proximity sensor with a zero to five volt DC output and a range of 1/16 inch to 1/4 inch, and a housing style limited to 10 mm by 8 cm long. What can you recommend here?

Casey: In this application, the target was metal, so the customer was looking for an analog inductive sensor. While we couldn't match him with a sensor that met his size restrictions with the sensing range he wanted, we were able to suggest the IA6-12GM35-U-V1. This sensor is just outside his size restrictions, but has the sensing range and electrical output that he needed.

John: Casey, this customer wants to know if we have a nylon impregnated polyurethane jacket for the NJ1.5-8GM-N sensor, which is used in a harsh environment. Do we have something like that?

Casey: While we don't have nylon impregnated polyurethane cables, we do have some cordsets that offer a higher resistance to mechanical stress. An example of one of these cordsets is irradiated polyurethane cable. It is capable of withstanding higher mechanical stress, as well as higher temperatures.

John: This customer is asking about the UB250-F12-U-V15 ultrasonic sensor, and wants to know what the sensing range would be in a level application. He's also asking about the sensing cone. Could you let us know if this could work in this type of application?

Casey: The sensing cone of an ultrasonic sensor is what the sensor "sees". The sound pulses are emitted from the sensing face of the sensor, spreading in an outward cone until contact with the target is made. As the sound travels farther, the diameter of the sound cone gets wider. In this application, the customer's sensing depth was shallow enough that the wall of the pan would not interfere with the sensor's sound cone, so the UB250-F12-U-V15 would work fine!

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

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Topics: Inductive Sensors, Ultrasonic Sensors, Ask an Expert

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