REF500COT_手册说明书指南

New Design Parts1----Daylight Plate;2----Calibration Screw;3----Focus Adjustment;4----Eyepiece;5----Calibration Screw BlockMethod of operation:1)Aim the front end of the refractometer to the direction of bright light,and adjust the eyepiece until the reticle can beseen clearly.2)Adjustment of null:Open the daylight plate and place 2-3 drops of distilled water on the main prism.Close the daylight plate and press itlightly so the water spreads across the entire surface of the prism without air bubbles or dry spots.Allow the sample toremain on the prism for approximately 30 seconds.Then adjust the Calibration Screw until the light/dark boundarycoincides with the null line.Adjustment of refractometer with temperature compensation function should be madeunder the condition of 20C(68F)environmental temperature.When working temperature of the room or environment(not the sample)changes by more than 5F,we recommend recalibration to maintain accuracy.3)Operation procedure is done after calibration and it is done in essentially the same manner as calibration.Open theprism.Close the daylight plate and press it lightly,then read the corresponding scale of light/dark boundary.Thereading is the value of measured solution.4)After measurement,clean away the measured solution on the surface of prism and cover plate by moist cotton cloth,.After drying,it should be shored perfectly.Warnings-Maintenance:1)Adjustment of null:Liquid and specimen should be under the same temperature.If the temperature varies greatly,thenull point should be adjusted once per 30 minutes.2)After usage,don't use water to wash the instrument,so as to prevent water from entering into the instrument.3)As it is a kind of precision optical instrument,you should handle it gently and take good care of it.Don't touch andscratch the optical surfaces.It should be kept in the environment of dry,clean and non-corrosive air,so as to prevent thesurface of it from turning mouldy and foggy.Please avoid strong shock during transportation.4)If the consumers use the instrument in accordance with the mentioned method of usage,it can be guaranteed that theinstrument can't break down.The optical performance can't change.Warranty and Repair Information:We warrant that all our refractometers are free from defects in material and workmanship for one year from the date ofpurchase.If the product is found to be defective by us,we will repair or replace the unit without charge.And we reservethe exclusive right to determine the cause of failure and advise if a warranty replacement or repair can be made.Thiswarranty does not include shipping costs,collect shipments will not be accepted,or any instrument that has become wornthrough use,broken from mis-use,neglect,tampering,or unauthorized repair.Return shipments will be re-paid freightunless other arrangements have been made.We will advise the customer of the repair cost of any refractometer notcovered by warranty.Work on such units will not begin until a purchase order i