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:
- What load does a proximity switch need to sense for bench testing?
- Does the SJ5-N inductive slot sensor need an intrinsic safety barrier?
- Should I use a fiber optic sensor for injection molded parts detection?
- Are the components in an AS-Interface circuit board module epoxy encapsulated or sealed?
- Do you have a handheld solution to identify nonworking RFID tags?
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.
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: Zach, in our first question, the customer would like to know the load that an inductive sensor needs to sense for bench testing. He has an NBB2-V3-US inductive proximity sensor, and he's using the sensor as a 24 VDC input to a PLC card.
Zach: When bench testing a 2-wire sensor, the best option for the load would be a small relay or resistor connected in series. If using a resistor, the suggested value would be 1k ohm or 2k ohm. And, you would also need a digital multimeter to view the voltage change across that resistor. For a relay, it is as simple as listening for the click when the target is present.
John: A customer asked if he needs to use an intrinsic safety barrier with an SJ5-N slot sensor. He states that he is using a 24 VDC system and that the slot sensor is in a nonhazardous area. What would you recommend, Zach?
Zach: Even though the SJ5-N slot sensor features a NAMUR output, it can also be used in a nonhazardous area without an intrinsic safety barrier. The sensor has an operating voltage range of 5 VDC to 25 VDC, so they can connect 24 volts directly, and it would function the same as a normally closed 2-wire switch.
John: Zach, a customer is wondering if he should use a through-beam fiber optic sensor to detect a thin 1.5 mm tail on an injection molded part. His thoughts are that using a small diameter fiber optic head would be best, as it allows for the most accurate detection.
Zach: In order to use a fiber optic solution with such a small target, I would recommend a slot style fiber optic sensing head, such as the HPF-T022-H, paired with an SU19 series amplifier. The design of this head makes it a perfect choice for detecting smaller parts. Another option might be our standard GLP series. These are photoelectric slot sensors which can detect objects down to 0.3 mm.
John: This next customer would like to know if the electronic components inside the VBA-4E4A-CB1-ZEJ/E2J AS-Interface module are epoxy encapsulated or environmentally sealed from the elements, and whether moisture can come into contact with the electronics? Zach, can you shed some light on this please?
Zach: The circuit board AS-Interface module VBA-4E4A-CB1-ZEJ/E2J is completely encapsulated to protect it from accidental damage. It also offers the lowest profile - sitting at only 27 mm high, including the removable terminals.
John: In our last question, Zach, the customer is looking for a handheld solution to read Pepperl+Fuchs RFID chips. He is currently using the IPH-L2-V1 RFID readers that are mounted on the equipment, but he wants a handheld model to identify nonworking RFID tags. The customer is wondering if the IPT-HH20 comes preprogrammed with this capability, or would he have to program it from scratch?
Zach: The RFID handhelds will come preprogrammed with the necessary commands to read and write tags. There is some setup to activate the commands, or assign them to buttons if you prefer, but it is very quick and simple to do. You don't have to do anything from scratch, it can perform this function on delivery.
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.