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压力变送器怎么选型

文章出处:华仁仪表 发表时间:2019-02-20 09:53

压力变送器是一种直接与被测介质接触的现场仪表,常常在高温、低温、腐蚀、振动、冲击等环境中工作,因此压力变送器澳门足彩选型时,除了要考虑测量范围与精度等一般仪表需要考虑的内容外,工作环境与被测介质等也是重要的指标之一。总体而言,压力变送器的选型,主要依据有:

测量范围

一般压力(差压)变送器都具有一定的量程可调范围,最好将使用的量程范围设定在它量程的1/3~2/3段,这样精度会有所保证,对于微差压变送器来说更是重要。确定系统中测量压力的最大值,一般而言需要选择一个具有比最大值还要大1.5倍左右的压力量程的变送器。这主要是在许多系统中,尤其是水压测量和加工处理中,有峰值和持续不规则的上下波动,这种瞬间的峰值能破坏压力传感器。于是可以用一个缓冲器来降低压力毛刺,但这样会降低传感器的响应速度。所以在选择变送器时要充分考虑压力范围、精度与其稳定性。

精度等级

JINGDUSHIRENHEGUOCHENGCELIANGSHEBEIDEGUANJIANXINGNENGZHIBIAO,YESHISHEBEIXUANXINGHEWEIHUXUYAOKAOLVDEYIGEZHONGYAOYINSU。GENJUCEYAFANWEI,GENJUGONGYISHANGYUNXUDEZUIDAJUEDUIWUCHA,XIANXUANCHULIANGCHENG,ZAIGENJUGONGYISHANGYUNXUDEZUIDAJUEDUIWUCHA,JISUANCHUYIBIAOYUNXUDEZUIDAYINYONGWUCHA,QUDIAO±HAOHE%,QISHUZHIJIUSHIJINGDU。RUOMEIYOUZHEIGEDENGJI,JIUKAOJINGDUDENGJI(WANGGAOJINGDUKAO)。YALI(CHAYA)BIANSONGQIZAIGEGEGUOJIASUOBIAODEJINGDUDENGJISHIBUYIYANGDE。BIRUZHONGGUOHEMEIGUODENGGUOJIA,BIAODEJINGDUSHICHUANGANQIZAIXIANXINGDUZUIHAODEBUFEN,YEJIUSHIWOMENTONGCHANGSUOSHUODECELIANGFANWEIDE10%~90%ZHIJIANDEJINGDU;EROUZHOUBIAODEJINGDU,ZESHIXIANXINGDUZUIBUHAODEBUFEN,YEJIUSHIWOMENTONGCHANGSUOSHUODECELIANGFANDE0~10%YIJI90%~100%ZHIJIANDEJINGDU。RUOUZHOUBIAODEJINGDUWEI1%,ZEZAIZHONGGUOBIAODEJINGDUJIUWEI0.5%。

 

MUQIAN,JUEDABUFENYALICHAYABIANSONGQIDEJINGDUZHIBIAOWEI0.1%HUO0.075%,GAOJINGDUZHIBIAOWEI0.05%HUO0.025%。DANSHISHANGMIANTIDAODEJINGDUZHISHIYOUYALICHAYABIANSONGQIZHIZAOCHANGTIGONGDEZHIBIAO,ZAIYONGHUSHENGCHANXIANCHANGSHIJIYINGYONGSHI,RUGUOYONGZHENGTIXINGNENGWUCHALAIBIAOSHUDEHUA,ZHIYOUJIXIAOBUFENXIANCHANGSHIJIYINGYONGSHIDEZHENGTIXINGNENGWUCHAKENENGDADAOZHIZAOCHANGTIGONGDEZHIBIAO,DADUOSHUQINGKUANGXIALIANGZHEXIANGQUSHENYUAN。SHIJIYINGYONGZHONGYINGXIANGJINGDUYINSUZHUYAOBAOKUOLIANGCHENGBIYINGXIANG、WENDUDUILINGDIANDEYINGXIANG、WENDUDUILIANGCHENGDEYINGXIANG、JINGYADUILINGDIANDEYINGXIANG、JINGYADUILIANGCHENGDEYINGXIANG,QIZHONGYALIBIANSONGQIZHIXUYAOKAOLVWENDUHELIANGCHENGBIDEYINGXIANG,ERCHAYABIANSONGQIXUYAOKAOLVQUANBUYINGXIANG。

澳门足彩 CHUCIZHIWAI,YINGXIANGJINGDUDEYINSUHAIBAOKUODIANYUANYINGXIANG、ZHENDONGYINGXIANG、ANZHUANGWEIZHIYINGXIANGDENG,DANZHEIXIEYINSUXIANGDUIYINGXIANGXIAO,XUYAOGENJUSHIJIXUQIUJINXINGKAOLV。

测量介质

RUGUOCELIANGDESHIXIANGDUIBIJIAOQINGJIEDELIUTI,JIUZHIJIECAIYONGBIAOZHUNDEYALIBIANSONGQIJIUKEYILE。RUBEICEJIEZHIWEIGAONIANDUYIJIEJINGQIANGFUSHIDECHANGHE,BIXUXUANYONGGELIXINGBIANSONGQI。CUNXUANXINGSHIYAOKAOLVTADEJIEZHIDUIMOHEJINSHUDEFUSHI,YIDINGYAOXUANHAOMOHECAIZHI,FOUZESHIYONGHOUHENDUANSHIWENJIUHUIJIANGWAIMOPIANFUSHIHUAI,FALANYEHUIBEIFUSHIHUAIZAOCHENGSHEBEIHERENSHENSHIGU。BIANSONGQIDEMOHECAIZHIYOUPUTONGBUXIUGANG、304BUXIUGANG、316LBUXIUGANG、TANMOHECAIZHIDENG。

接液材质

澳门足彩 YIBANDEYALIBIANSONGQIDEJIECHUJIEZHIBUFENDECAIZHICAIYONGDESHI316BUXIUGANG,RUGUOCELIANGJIEZHIDUI316BUXIUGANGMEIYOUFUSHIXING,NEIMEJIBENSHANGSUOYOUDEYALIBIANSONGQIDOUSHIHEDUIJIEZHIYALIDECELIANG。

RUGUOCELIANGJIEZHIDUI316BUXIUGANGYOUFUSHIXING,NEIMEJIUYAOCAIYONGHUAXUEMIFENG,ZHEIYANGBUDANQIDAOKEYICELIANGJIEZHIDEYALI,YEKEYIYOUXIAODEZUZHIJIEZHIYUYALIBIANSONGQIDEJIEYEBUFENDEJIECHU,CONGERQIDAOBAOHUYALIBIANSONGQI,YANZHANGLEYALIBIANSONGQIDESHOUMING。

介质温度

YOUSHIYALIBIANSONGQIDEXINHAOSHITONGGUODIANYUXIANLUBUFENZHUANHUANDE,SUOYIYIBANQINGKUANGXIA,YALIBIANSONGQIDECELIANGJIEZHIWENDUWEI-30DAO+100DU,RUGUOWENDUGUOGAO,YIBANCAIYONGDESHILENGNINGWANLAILENGQUEJIEZHI。

输出信号

MUQIANYOUYUGEZHONGCAIJIDEXUYAO,XIANZAISHICHANGSHANGYALIBIANSONGQIDESHUCHUXINHAOYOUHENDUOZHONG。ZHUYAO4~20mA、0~20mA、0~10V、0~5VDENGDENG。DANSHIBIJIAOCHANGYONGDESHI420mAHE0~10VLIANGZHONG。SHANGMIANLIEJUDEZHEIXIESHUCHUXINHAOZHONG,ZHIYOU4~20mAWEILIANGXIANZHIBAOHANJIEDIHUOPINGBIXIAN),QITADEJUNWEISANXIANZHI。

其他

实践中有些应用场合(液位测量)需要对变送器的测量范围迁移,根据现场安装位置计算出测量范围和迁移量进行迁移。目前,智能变送器已相当普及,其特点是精度高、可调范围大,而且调整非常方便,稳定性好,选型时应多考虑。此外,压力(差压)变送器的过程连接接口,以及压力变送器的供电电压,如果在特殊的场合下使用,还要考虑防爆以及防护等级。

此文关键字:压力,变送器,怎么,选型,压力,变送器,是,一种,
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