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儀表的防護措施

更新時(shí)間:2013-01-11      點(diǎn)擊次數:1658

儀表的防護措施:
儀表經(jīng)常在易燃、易爆、腐蝕、高溫、低溫、振動(dòng)、潮濕等條件下工作。為此,必須采取一定的措施,保證儀表進(jìn)行正??煽康墓ぷ?。常見(jiàn)的防護措施有以下幾點(diǎn)。

1.防爆措施。在易燃易爆的地方要選用防爆型儀表及其附屬裝置如選用電動(dòng)III型儀表、油浸式切換開(kāi)關(guān)、隔爆型接線(xiàn)端子等。

2.防腐措施。在制造儀表時(shí),與腐蝕介質(zhì)相接觸的部件應采用耐腐蝕材料,并在介質(zhì)與儀表連接導管上安置隔離雄,內裝中性隔離液。此外,導壓管、.穿線(xiàn)導管在腐蝕的環(huán)境中還要定期刷油。

3.防高溫措施。在制造儀表時(shí)應考慮選用散熱型元件和部件,安裝時(shí)還可以裝設專(zhuān)門(mén)的隔熱裝置,加強通風(fēng)。

4.防凍措施。室外的儀表可單獨設置儀表箱,箱內用蒸汽伴熱或用電熱管伴熱,有些一次元件如熱電偶、熱電阻及取壓裝置和導壓管也要進(jìn)行保溫或蒸汽伴熱。

5.防振措施。裝于易振位置的儀表通常采用橡皮軟墊和彈簧來(lái)吸收振動(dòng)。對于被測介質(zhì)的沖擊可在取壓點(diǎn)和測量?jì)x表之間裝設緩沖器或阻尼閥,以克服脈沖壓力對儀表的影響。

6.防潮措施。為了防潮常在儀表和儀表箱內放入干燥劑。常用的干燥劑是硅膠或氯化鈣。

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