Dear ESDA experts,
I would like to ask how to properly measure our new ESD belt conveyor.
We have this type of device for measuring: Starterkit SRM 200/ EFM 51.
We were measuring offset and RGP.
And RPP we were measuring with the SRM 200 on each 30 cm of the belt (without two external electrodes) - is that right?
Or what do you suggest?
Thank you very much in advance.
Best regards,
Lucie
Good Afternoon Lucie,
First, I am not familiar with this type of measurement equipment. The measurement equipment I normally use is an SRM with 2 5Lb electrodes. To get proper point to point measurements you need to have a specified distance between electrodes, and test multiple points along the conveyor.
For a good measurement method, I would recommend you get a copy of ESD TR53 which is the compliance verification that has numerous test methods. The section you would refer to for conveyors is the worksurface section. TR53 is a complementary download from the ESD Association website www.esda.org
Hope this helps
MattS
Hi Lucie,
I am the working group chair for WG Worksurfaces. We are currently working on a Technical Report (TR) for measurements on conveyors and it does include testing of belt type conveyors.
This procedure includes two types of tests that need to be performed. Resistance point to ground-able point and resistance point to point.
The test equipment:
Two electrode(s) (these are the same that are used for testing worksurfaces and flooring) that shall be 2.27 kg ± 0.06 kg (5lb) with a diameter of 63.5 mm ± 3mm having a contact surface of electrically conductive rubber material.
The resistance meter shall have a resistance range be ≤ 1.0 x 103 ohms to ≥ 1.0 x 1010 ohms. The test voltages to be used are 10 volts and 100 volts while under load.
The resistance to ground-able point would be performed in several places on each section on the conveyor.
The point to point measurement would be performed on several locations on each section of the conveyor. Choose one location for the first location and then place the second electrode at serval other locations on each section of the conveyor.
Greetings of the day from India to all on this platform.
You have just showed the photo of the SRM used have not mentioned the resistance range it can measure and the activation test voltage that it can apply.
Per ANSI ESD S 20 20 for work surfaces P-P and Rgp/Rtg need to be tested per ANSI ESD STM 4.1. The new version is likely to be released from ESDA shortly and perhaps that will include a note for the conveyor surfaces too.
As mentioned by our ESDA experts Mr. Matt and Mr. Daleparkin -Chair person of ESDA WG Work surfaces, you need to use the right SRM and the Electrodes they have mentioned.
Always please keep for your reference following documents as your guide and refreshing it often
ANSI ESD S 20 20 2021
ANSI ESD TR 53-01-2022
ANSI ESD S541-2019( for the packaging items )
All the above three are available on free download basis from the ESDA site .
Hope the above information may be of some assistance to you .
Hi Lucie
I know the SRM 200, so you measured the belt RPP quite OK. But …
SRM 200 has two flat electrodes on bottom, covered with rubber which comply to Shore A pointed by standards. The problem is that your results are in high dependance from the force you do when pushing the button during measurement. So, better is to use probe as highest level expert Dale Parkin said.
And please know that the RPP is only material characterization factor. For proper measurement you should measure RGT from mounted belt surface to grounding point easy to rich when you use the cord as on your picture taken. Put SRM 200 onto belt, cord grounded step before in one of SRM unit inlets, and read the value. If it is below 1 Gig ohms you are home. And think about the force of pushing the ON button.
Regards
