SN/T 1894: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| SN/T 1894-2022 | English | RFQ |
ASK
|
3 days [Need to translate]
|
(Operating procedures for the automatic sampling and preparation system for bulk grains)
| Valid |
SN/T 1894-2022
|
| SN/T 1894-2007 | English | 359 |
Add to Cart
|
3 days [Need to translate]
|
Rules for system of automatic sampling for corn in bulk
| Obsolete |
SN/T 1894-2007
|
PDF similar to SN/T 1894-2022
Basic data | Standard ID | SN/T 1894-2022 (SN/T1894-2022) | | Description (Translated English) | (Operating procedures for the automatic sampling and preparation system for bulk grains) | | Sector / Industry | Commodity Inspection Standard (Recommended) | | Classification of Chinese Standard | B16 | | Classification of International Standard | 65.020.01 | | Date of Issue | 2022-07-07 | | Date of Implementation | 2023-02-01 | | Older Standard (superseded by this standard) | SN/T 1894-2007 | | Issuing agency(ies) | General Administration of Customs | SN/T 1894-2007: Rules for system of automatic sampling for corn in bulk---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Rules for system of automatic sampling for corn in bulk
Exit inspection and quarantine industry standard book People's Republic of China
Bulk Cereals Automatic Sampling System procedures
Posted 2007-05-23
2007-12-01 implementation
People's Republic of China
The State Administration of Quality Supervision, Inspection and Quarantine released
Foreword
Appendix A of this standard is an informative annex.
This standard is proposed and managed by the National Certification and Accreditation Administration Committee.
This standard was drafted by the People's Republic of China Qinhuangdao Exit Inspection and Quarantine.
Drafters of this standard. Zhang Zhiwei, Ma Xinfeng, Zhaoshu Guo, Chen Baozhu.
This standard is the first release of the entry-exit inspection and quarantine industry standards.
Bulk Cereals Automatic Sampling System procedures
1 Scope
This standard specifies the bulk Cereals mechanization automatic Sampling equipment requirements, and operating norms.
This standard applies to the entry and exit inspection and quarantine Cereals Mechanized automatic Sampling.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
ISO 6644 dynamic mechanical grains and abrasive products --- automatic method for sampling
JISZ9041-2.1999 related to the mean and variance of the estimation and testing technology
3 Sampling
3.1 Overview
Food quality stream sampling unit sampling manner. Sampling, should ensure that the interception of a complete cross-section of the grain stream segment as a sub-sample, subsample
You can not fill the entire sample or overflow from the sampler.
Sub-sample should be taken as far as possible from the flow rate in a relatively uniform flow of grain. We should try to avoid periodicity and quality sampling period running stream of heavy grain
Together, in order to avoid sampling bias (see Appendix A).
3.2 Automatic Sampling
3.2.1 Quality Unit
3.2.1.1 Primary sub-sampling for
Primary sub-sample of the same quality preset interval taken should be variable speed sampler. When the number of sub-samples have been pre-computed
Mining enough, while the grain flow stream sampling unit is not finished, sampling shall continue until the end.
3.2.1.2 sampling interval
The sampling interval may be unloading system weight is given electrical subsystem, with the grain flow variations and change.
3.2.1.3 child-like quality
Quality sub-sample primary sampling unit mass flow less affected by grain, the entire sampling process after each primary sub-sample or sub-sample and dividing primary quality
The basic amount shall be equal to the amount calculated by the primary sub-sample of formula (1) obtained, it should ensure that after the primary sub-sample and dividing by the amount of the final sample is not lower than the standards and inspection
Inspection and quarantine experiments.
G = L × S3.6 × Vp
(1)
Where.
G --- sub-sample weight, in grams (g);
L --- flow rate, tonnes every hour (t/h);
Vp --- cutting speed in meters per second (m/s);
The S --- cutter opening width in millimeters (mm).
3.2.2 Sample Batch
For different types of food, according to the inspection and quarantine standards may be different batches of several tons to do.
|