GB/T 34042-2017 in English
VALIDGeneral specification for on-line analyzer systems
- Issued on:2017-09-07
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 5 business days
$670.00
《GB/T 34042-2017在线分析仪器系统通用规范》由TC124（全国工业过程测量控制和自动化标准化技术委员会）归口，TC124SC6（全国工业过程测量控制和自动化标准化技术委员会分析仪器分会）执行，主管部门为中国机械工业联合会。
Introduction
Analysis of the core content of the standard
| System module | Key requirements | Technical indicators |
|---|---|---|
| Sample processing system | Representative sampling, lag time control | Transmission lag<60s, leakage rate<2%/15min |
| Analytical instrument | Environmental adaptability, explosion-proof protection | Working temperature 5-40℃, protection level IP65 |
| Analysis hut | Positive pressure ventilation, safety interlock | Ventilation 6 times/h, oxygen content ≥18% |
Technological evolution and standard background
This standard integrates more than 20 industry specifications such as HJ/T 76 and GB/T 25923, and establishes for the first time a full system technical framework covering online analysis of gas/liquid. Key points solved:
- Sample distortion problem: clarify the quantitative index of composition error ≤1.5%
- Explosion-proof safety requirements: refine the design differences of Zone 1/Zone 2 explosion environment
- Data traceability mechanism: stipulate that the data management system must comply with HJ/T 212 communication protocol
Typical application cases
CEMS system implementation in petrochemical industry
A refinery adopts the flue gas monitoring system configured in this standard:
- Use external heating probe (Appendix A Figure A.3) to solve the blockage of high-dust flue gas
- Control the lag time to 42s through the volume flow calculation method (Appendix F)
- The analysis room is equipped with a triple interlock (combustible gas/oxygen/pressure monitoring)
The system is certified by HJ/T 76, with a continuous operation MTBF of 8,000 hours.
Implementation Suggestions
System Selection Matrix
| Working Conditions | Recommended Configuration |
|---|---|
| Corrosive Gas | PFA Pipe+316L Stainless Steel Probe |
| High Viscosity Liquid | 1/2"Tube+Steam Tracing |
| Explosion-proof Zone 1 | Positive Pressure Analysis Cabin+Intrinsically Safe Instruments |
Note: The specific implementation needs to refer to SH/T3174 and other industry supplementary specifications
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