Việc hiệu chuẩn áp kế pittông đúng cách đòi hỏi nhiều bước. Để tiết kiệm công sức cũng như kinh phí, chúng tôi xin giới thiệu một quy trình đơn giản, chính xác. Nội dung dưới đây là nguồn tham khảo tuyệt vời cho mọi cơ sở thí nghiệm quan tâm đến chủ đề này. Cùng theo dõi đến cuối bài viết để tích lũy thêm nhiều kinh nghiệm nhé!
Giải thích thuật ngữ
Để hiểu rõ được nội dung bài chia sẻ, trước tiên chúng ta cần làm rõ một vài khái niệm chuyên môn:
- Áp kế pittông chuẩn: đây là loại thiết bị được sử dụng làm mốc. Lấy nó làm quy chuẩn để so sánh với thiết bị khác.
- Giới hạn trên (dưới) của pittông: là vị trí khi cao (thấp) nhất của pittông. Tại điểm đó, áp suất khí sẽ được tạo ra.
- ĐKĐBĐ: viết tắt của độ không đảm bảo đo.
- UUT (hay Unit Under Test): chỉ áp kế pittông cần được hiệu chuẩn.
- Diện tích hiệu dụng: là khái niệm chỉ phần diện tích ở giữa pittông và xylanh.
Quy trình hiệu chuẩn áp kế pittông tại ISOCAL
Lưu ý rằng các bước dưới đây chỉ được áp dụng cho loại áp kế pittông có thông số nằm trong phạm vi:
- Độ đo dao động từ 0,0015 – 7MPa khi ở áp suất tuyệt đối, từ -0,1 – 100MPa khi có áp suất tương đối. Độ chính xác rơi vào mức 0,008%.
- Áp kế dạng dầu có ngưỡng đo không nằm ngoài -0,1 – 500MPa.
Các phép hiệu chuẩn
Như mọi quy trình khác, các phép hiệu chuẩn được bố trí theo trình tự:
- Kiểm tra bên ngoài.
- Kiểm tra kỹ thuật.
- Kiểm tra đo lường: trong đó cần chú ý xác định khối lượng đĩa cân và pittong và hệ số cơ bản của UUT.
Phương tiện hiệu chuẩn
Để quá trình hiệu chuẩn diễn ra nhanh chóng thì cần sử dụng kết hợp nhiều phương tiện khác. Cụ thể gồm có những dụng cụ quan trọng như:
| Chuẩn đo lường | Áp kế pittông chuẩn |
| Phương tiện đo | Phương tiện đo chân không |
| Nhiệt kế | |
| Ẩm kế | |
| Máy đo áp suất khí quyển | |
| Đồng hồ đo thời gian | |
| Cân đo | |
| Quả cân chuẩn | |
| Phương tiện phụ | Van thể tích |
| Bơm hút chân không | |
| Hệ thống tạo áp suất | |
| Bơm tạo áp suất tuyệt | |
| Nguồn điện | |
| Van điều áp | |
| Bình phân ly |
Điều kiện hiệu chuẩn áp kế pittông
Trước khi bắt đầu tiến hành cần đảm bảo nơi diễn ra hiệu chuẩn đạt được hai yêu cầu sau:
- Nhiệt độ phòng luôn ổn định từ 18 – 28℃, không được thay đổi quá 2℃ mỗi giờ.
- Mức độ ẩm tối đa là 80%RH.
Chuẩn bị hiệu chuẩn
- ĐKĐBĐ của chuẩn phải phù hợp với yêu cầu kỹ thuật.
- Các loại bơm tạo áp suất nhân tạo không được lắp cùng chỗ với pittông.
- Yêu cầu với áp suất khí tương đối phức tạp. Nhất định phải được làm sạch sẽ, không tiếp xúc trực tiếp với nguồn nhiệt cao.
- Với các loại áp suất lỏng: đã được vệ sinh và phơi khô tự nhiên. Khi sử dụng cần còn đủ tính ma sát theo mô tả của nhà sản xuất.
- Yêu cầu lắp đặt: lắp đúng theo mô tả kỹ thuật. Vị trí lắp đặt cần được bố trí hợp lý, không tiếp xúc trực tiếp gần nguồn điện.
Tiến hành hiệu chuẩn áp kế pittông
Kiểm tra bên ngoài
Kiểm tra tem nhãn, logo in nổi của nhà sản xuất. Sau đó xác định xem mẫu mã của thiết bị có phù hợp với phạm vi tiến hành của quy trình hay không. Cuối cùng, chú ý các chi tiết ngoại quan như vỏ máy, chất liệu, vạch chia, nút bấm… Nếu có điểm nào không đúng theo mô tả hoặc có lỗi, không nên tiếp tục tiến hành.
Kiểm tra kỹ thuật
Chú ý tiến hành theo trình tự sau để quy trình diễn ra hiệu quả, trơn tru:
- Tính toán phương tác dụng của lực và góc vuông của đĩa cân so với trục pittông.
- Ước lượng độ kín của cả hệ thống.
- Kiểm tra thời gian hao phí ở trạng thái quay tự do.
- Đo tốc độ nâng và hạ của pittông.
Các bước này đều đòi hỏi độ chính xác cao. Do đó, khi tiến hành cần hết sức tập trung, không nên để các yếu tố bên ngoài ảnh hưởng đến thao tác hiệu chuẩn.
Kiểm tra đo lường
Quá trình tiến hành đo lường được phân ra nhiều bước. Tuy nhiên, yêu cầu chung của giai đoạn này là người tiến hành phải xác định được độ chính xác, sai số, khối lượng, thể tích đo… của đối tượng. Sau khi hoàn tất các công đoạn cơ bản, có thông số đo thì cần ghi chính xác vào bảng mẫu. Tiếp tục tính toán theo công thức đính kèm và xem xét, đưa ra kết luận.
Ước lượng độ không đảm bảo đo
Được viết tắt là ĐKĐBĐ. Đây là thông số phản ánh độ chính xác của phép hiệu chuẩn. Nếu ĐKĐBĐ của phép hiệu chuẩn càng nhỏ, chứng tỏ độ tin cậy của kết quả càng cao. Và ngược lại, khi giá trị này lớn hơn mức cho phép thì giá trị của phép đo mất hiệu lực.
Xử lý chung
- Nếu áp kế pittông đáp ứng được mọi tiêu chí của quy trình thì sẽ được cấp chứng nhận. Trường hợp ngược lại, khi không đạt từ một yêu cầu trở lên, thiết bị sẽ không được cấp con dấu mới.
- Chu kỳ hiệu chuẩn: 24 tháng
Lời kết
Trên đây là những kinh nghiệm mà ISOCAL đúc kết được sau nhiều năm làm nghề. Chúng tôi luôn chia sẻ kiến thức với phương châm hỗ trợ và giúp đỡ bạn đọc hết mình. Mong rằng những thông tin này hữu ích với thắc mắc của quý khách. Nếu cần được tư vấn kỹ hơn về dịch vụ hiệu chuẩn áp kế pittông, hãy liên hệ ngay với đội ngũ tư vấn viên của chúng tôi. ISOCAL hân hạnh được phục vụ bạn!
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