ปฏิบัติการสอบเทียบเครื่องมือ 1 MQS 3304 - สอบเทียบ มวล (Weight Calibration) according to OIML R 111-1:E (2004) 1) Correct Data in worksheet 2) Calculation of Conventional Mass 3) Estimation of Uncertainty of Measurements 4) Issue the Certificate of Calibration 5) Write Down the Calibration Procedure (CP) 6) Group Presentation 7) Create the Quality Manual (QM) ding

ปฏิบัติการสอบเทียบเครื่องมือ 1 MQS 3304 Mass Laboratory

Pt-Ir No. 80

The technical transfer for large weight (up to 1000 kg) Standard weights, shape – disc weights 50 kg, 100 kg, 200 kg, 500 kg and 1000 kg The technical transfer for large weight (up to 1000 kg) was support by expert from NMIJ, Japan.

The importance of calibration Corresponding to a standard of measurement Due to the change of scales and weights. To be able confirm the accuracy of the measurements. -Know the limits tolerances of the measurement results or not. - A few percent certainty that the measurement results. The tolerances in scope. - There is a reference or not. - Confirm it possible that the accurate suitable for work The Preparation of quality system

Weights

Standard of measurement of mass. OIML (International Organization of Legal Metrology) OIML R111 divided by weight into Class E1, E2, F1, F2, M1, M2, M3. By technical specifications of the weights. Shape Material Magnetism Surface condition The error of weights (Error).

(Material) Stainless Steel Class E1 • Brass Class F1 Recommend F2 Class M1 Recommend M2

With adjustment

Sheet and wire

The selection of weights to suit the work. From the ISO 10012, we have to choose Tum weight Not more than the tolerances. 1 in 10 of tolerance, but tolerance is deferred to. Up to a maximum of 1 in 3. For example, if we want to calibrate weights 100 g by the coordinates. Error does not exceed ± 0.15 mg, so the weight of the calibration standard. To deviate by no more than 1/3 of 0.15 mg, equivalent to 0.05 mg.

Class of calibration

Attendance Do not touch the weights with bare hands.

Attendance Cleaned using a soft brush dusting particles. Keep weights In clean area environment and a constant

Attendance Do not place the weights on the floor directly or place the weights stacked

Attendance Keep weights knocked crash or dragging to the weighing pan.

Force Laboratory By Force Laboratory, Department of Mechanical Metrology National Institute of Metrology (Thailand)

Deadweight Force Standard Machine Expanded relative uncertainty = 20 ppm

Deadweight Force Standard Machine Expanded relative uncertainty = 20 ppm

Hardness Laboratory

Hardness Standards Hardness Laboratory Rockwell Hardness scale C Vickers Hardness (200 HV – 900 HV) At 0.01 kgf – 50 kgf Brinell Hardness Rebound Hardness (Shore hardness) Elastomer Hardness (Shore IRHD)

The First Machine of Hardness Laboratory at NIMT NIMT Hardness Machines The First Machine of Hardness Laboratory at NIMT Standard Rockwell Hardness Machine (SHT-31) was donated from Akashi Corporation

Primary Vickers Hardness Machine NIMT Hardness Machines Primary Vickers Hardness Machine Test force : 10 kgf to 50 kgf

Reference Standards Rockwell Calibration System (CSR 150) Force Measurement Depth Measurement Testing Cycle Measurement