Re: Oiml R-50 Belt Scale Testing Requirements
Good Day Todd,
OIML R 50 is applicable here in Australia, although it has been rebadged as NSC R 50. We would use this system of calibration on weighers used for trade purposes, as it is legally required by the various Acts in place here.
I can't really comment on the differences between this and NIST 44, as we would not use this guideline.
OIML has a website that may answer your questions.
http://www.oiml.org/
Regards ■
Oiml R50
Hello Todd and Steve,
I correspond with Paul Chase a bit and yes, as Steve says we use OIMLR50 here, or at least a close derivitive.
Todd, you will need curve fitting. Thats as much as I think it fair to tell a competitor.
I agree with your comments in general about weigh frame stability. But does Rice Lake build serious weigh frames? Where can I see one on the net? ■
OIML R-50 Belt Scale Testing Requirements
Learned Readers,
I am writing operating software for Rice Lake Weighing's 920i indicator/controller as a conveyor belt scale. I have written the span calibration procedures for static weights, but I would also like to include a material testing routine. Currently the dynamic span can be manipulated manually, so a material test can be performed by typing in a correction. I have not included curve fitting for various feed rates, as We have always been under the opinion, that if a system must have multiple span corrections, the scale installation or application is probably unstable as a certified scale.
I have attended a presentation by Mr. Paul Chase on the differences between the OIML R-50 testing procedures and the NIST HB 44 procedures. I have performed and assisted with certifications on a number of conveyor belt scales in the US, but I have never wittnessed a OIML R-50 test.
I would like an opinion on the R-50 tests. From what I remember from Mr. Chase's presentation, the R-50 tests were dependant on material feed rates over short durations. The NIST tests were written around a "tested as used" philosophy. Is there an online reference for the OIML R-50 material test? Are most belt scales installed internationally tested using
OIML R-50 or NIST HB44? Or is OIML R-50 only used in EU block countries?
Thank you for your time and consideration, ■