The bimetallic thermometer inspection specifications

1. Control work order, combining test inspection instruction bimetallic thermometer. 2. The accuracy test: ( In second class standard thermometer for standard, thermostatic bath as testing equipment. ） Take a range of 0 ~ 25%, 76, 26 ~ 75% ~ 100% of a bit, the margin of error is: under 250 ℃ & plusmn; 1%,250 ~ 300℃± 1. 5%, more than 300 ℃ & plusmn; 2%. Work order have special requirements, the work order shall prevail. 3. Visual inspection: Visual) Visible parts have no obvious blemishes, scratch or damage. 4. Inspection: (table CARDS Visual) Color scale, trademarks and conform to the requirements of the work order; Requirement for printing quality, information on the card printing content complete and clear. 5. Structure inspection: Visual inspection and use vernier caliper and thread ring gauge) Pointer, installation method, thermal components outside diameter and length, pan, cover, connector and table should be accord with the requirement of work orders. Pointer must not have paint tumor, burr; Joint thread must not have crack, collapse, ground bald and sliding tooth phenomenon; Table should maintain a transparent light, no oil, scratches. Waterproof requirements, should be placed in water, no leakage. Fill in the table filling liquid and transparent, without impurities or floats, its fluid should conform to the requirements of the work order, clean a height should be located in the heart of the case above 0. 25 d ~ 0。 3 d ( D for meter diameter) And, in 60 ℃ heating and constant temperature box, no leakage phenomenon. 6. Packing inspection: ( Visual) Instrument must be suitable set of bubble bag or plastic bag, and put the corresponding outer. Specifications marks and instrument of content should be accurate, and post them in the right place. Carton is moderate, all related printing content; Writing is label and side mark is accurate. 7. Sampling plan adopted GB/T2828 standard, IL: S - 4,AQL: 1。 0. 8. Inspection of the project, in addition to & other; Accuracy & throughout; Project should record the testing data of the maximum and minimum values, the rest of the project is eligible to play & other; √ ” , not qualified to play & other × ” 。