StoneL推出了FF總線的閥位指示器，這種閥位指示器可選購配套的低功耗防爆電磁閥。電磁閥的電流消耗為2mA，7.5V,低電壓低電流啟動,防爆等*為Eexia llC T6。這樣就*大地提高了總線上可帶閥位指示器的數量。
主要產品：Stonel閥、Stonel閥位開關、Stonel限位開關、、STONEL閥座、Stonel閥位信號反饋裝置、Stonel模塊、Stonel連接器、Stonel控制閥、Stonel電源供應器、Stonel外層保護殼、Stonel閥位控制器，stonel閥位回訊器，stonel quartz開關
STONEL閥位回訊器分為6個系列，分別為Eclipsc,Visual Indicator,Quartz,SolaR,Onxy,Hawkeye
型號：ECN系列、ECG系列、QZP系列、QZI系列、QZM系列、QZE系列、HK系列。
常用型號：
QX2HR02SRA-PTWS1, QX2VR06SRA-PTNJ6,(QZE2VP5DSS), QX2VR02SRA, QN2NC02SRA-PTBL1(QZP2NE2R), QZM2VE2R, QZM2VE3RCPLH1, AMI331HA02SRA-PTQL1, QZP44E1R, QZP4NE2R, QZM2VE2R-PTLH2, QG14C02SRA-PTZX1 QZP4HB2DSS-K, ECG3313R, ECG3313DS, QZP2NE2R, ECN4405R, SEH90, HK3077SG, HK3077SR, QUARTZSEH90, ECN3302R EN33C02RA ECN9602R EN96C02RA ECG3323R EG33C23RA ECG9623R EG96C23RA ECN3302F EN33C02FA ECN9602F EN96C02FA ECG3323F EG33C23FA ECG9623F
QX2HR02SRA-PTWS1,QX2VR06SRA-PTNJ6,(QZE2VP5DSS),QX2VR02SRA,QN2NC02SRA-PTBL1(QZP2NE2R),QZM2VE2R,QZM2VE3RCPLH1,AMI331HA02SRA-PTQL1, QZP44E1R, QZP4NE2R, QZM2VE2R-PTLH2, QG14C02SRA-PTZX1 QZP4HB2DSS-K, ECG3313R, ECG3313DS, QZP2NE2R, ECN4405R, SEH90, HK3077SG, HK3077SR, QUARTZSEH90, ECN3302R EN33C02RA ECN9602R EN96C02RA ECG3323R EG33C23RA ECG9623R EG96C23RA ECN3302F EN33C02FA ECN9602F EN96C02FA ECG3323F EG33C23FA ECG9623
