Dear Mr Ponnuraj, I don't know if I understood your question, but viscosity standards are silicon oils.  Brookfield company sells these oils. See the link: http://www.brookfieldengineering.com/products/viscosity-standards/

One procedure of calibration is shown in link: http://www.brookfieldengineering.com/support/calibration.asp

Of course, the viscosity changes with temperature. Therefore, it is more adequate to use a thermostatized bath for calibration.  For adjusting the device in case out scale, it is more complicated. I think that is necessary to adjust the coil, if your device is analog. The best is contact the manufacturer for this. On the order hand, maybe if  you makes a calibration curve with standards in all range, you could use it to correct the value of viscosity.  This is just a suggestion once certified calibration is very expensive. I hope this helps you. 

Dear Julio 

Thanks for your input and sharing those links. 

Hello Ramkumar,

I presented a short Good Viscosity Testing webinar that briefly discusses calibration checking around 22m.40s. You can view it here: http://www.rheologylab.com/free-webinars/free-webinar-good-viscosity-testing_od/

Please note, Julio is correct, you can only verify the calibration, an actual calibration adjustment of the torque transducer would have to be performed by the company or a service engineer.

Hope this helps, if you have a specific questions please don't hesitate to contact me.

Neil

https://www.rheologylab.com

What can be the acceptable limit for known standard of Viscometer solution during calinration of the viscometer .?

for eg viscometer solution of known std 12320 cps has the tolerance limit of ?