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学习笔记 | 不透光烟度计自校准的意义和操作方法

  • 2026-04-26 18:48:04
学习笔记 | 不透光烟度计自校准的意义和操作方法

最近在研读 JJG 976-2024《透射式烟度计检定规程》时,不少朋友提出了一个灵魂拷问:

“现在的烟度计都是第三方每年检定一次,机动车检验机构自己再做‘自校准’,是不是多此一举?”

今天我们就结合 GB 3847-2018 和 HJ 1237-2021 这两个核心标准,聊聊不透光烟度计自校准的法律意义,并奉上一份最新的实操指南


一、 为什么要“多此一举”?——自校准的法规必要性

答案很明确:这不是“多此一举”,而是标准强制要求的“期间核查”。

很多机构认为有了第三方的《检定证书》就万事大吉,但在监管部门的现场检查(如“双随机、一公开”)中,重点关注往往是“检定周期内”的仪器状态。

1. 来自 HJ 1237-2021 的要求

《机动车排放检验与维护技术规范》第7.3条明确要求检验机构建立设备档案,进行定期校准和期间核查

这意味着,如果你只有年检报告,而没有日常的自校准(期间核查)记录,在资质认定(CMA)扩项或复查时,评审专家有权判定你的设备管理不符合规范。

2. 来自 GB 3847-2018 的要求

在做自由加速法或加载减速法前,标准强制要求对烟度计进行“零点检查”和“量距点检查”

这不就是一次微型化的自校准吗?

结论

第三方检定解决的是“准入资格”(一年一度);

自校准解决的是“日常健康”(每日/每周)。

两者缺一不可。


二、 核心变更提醒:告别 JJG 976-2010

2024年8月7日,JJG 976-2024 已正式实施。本次修订对自校准提出了更严苛的要求,请大家务必更新作业指导书:

关键指标

旧版 (2010)

新版 (2024)

影响

环境温度

15~35℃

(23±5)℃

温控要求更严

滤光片点位

0.86, 0.78, 0.50

0.90, 0.80, 0.60, 0.40

校准点更密

温度误差

±5℃

±2.0℃

精度要求翻倍

如果你的自校准还在用老标准,那在新规下就是无效校准


三、 实操干货:不透光烟度计自校准流程

以下是我们整理的《烟度计自校准作业指导书》精简版,建议收藏备用。

1. 准备工作(“三件套”不能少)

  • 环境:温度控制在 (23±5)℃,湿度≤85%RH。

  • 工具:一套经过检定合格的中性滤光片(τ≈0.90、0.80、0.60、0.40)、响应时间测量仪、干体炉。

  • 仪器:探头无积碳、光窗无指纹、通电预热30分钟。

2. 校准五步走

第一步:零点校准(每日必做)

插入100%遮光板,调节零点。

判定:示值应为 0.0% ± 0.3%

第二步:示值误差校准(核心)

依次插入4块滤光片,记录示值 N

判定(依据 JJG 976-2024):

  • 低浓度段(N<50%):误差 ≤ ±2.0%

  • 高浓度段(N≥50%):误差 ≤ ±3.0%

第三步:重复性测试

选中间量程滤光片(如τ=0.60),连续测6次。

判定:相对标准偏差 RSD ≤ 1.0%

第四步:响应时间测试

模拟10%~90%信号跃变。

判定:响应时间 ≤ 1.0 s

第五步:温度比对

用干体炉加热至40℃和80℃。

判定:温度示值误差 ≤ ±2.0℃(这是新规重点!)。


四、 给检验机构的建议

  1. 别把维护当校准:清洁探头、擦拭光窗是日常保养,不等于自校准。一定要有数据记录、有误差计算、有判定结论。

  2. 记录留痕:建议设计专用的《烟度计期间核查记录表》,哪怕只做零点和单点核查,也要记录在案。监管部门检查时,这就是你“数据可信”的铁证。

  3. 及时更新:赶紧检查一下你们现在的作业指导书是不是还写着“依据 JJG 976-2010”,如果是,请立即修订!


欢迎在评论区留言交流!


本文内容参考 JJG 976-2024、GB 3847-2018、HJ 1237-2021 编写,仅供技术交流,具体操作请以官方标准文本为准。

大家注意,转载必须注明原作者和出处,避免引起法务纠纷。

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  1. CONNECT:[ UseTime:0.000377s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000670s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000326s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000264s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000479s ]
  6. SELECT * FROM `set` [ RunTime:0.000190s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000491s ]
  8. SELECT * FROM `article` WHERE `id` = 483909 LIMIT 1 [ RunTime:0.000415s ]
  9. UPDATE `article` SET `lasttime` = 1777209125 WHERE `id` = 483909 [ RunTime:0.016357s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000284s ]
  11. SELECT * FROM `article` WHERE `id` < 483909 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002091s ]
  12. SELECT * FROM `article` WHERE `id` > 483909 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000388s ]
  13. SELECT * FROM `article` WHERE `id` < 483909 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003494s ]
  14. SELECT * FROM `article` WHERE `id` < 483909 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001868s ]
  15. SELECT * FROM `article` WHERE `id` < 483909 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001301s ]
0.103186s