美國Stonel公司閥位回訊器,限位開關,閥位信號反饋裝置
STONEL 閥位回訊器分為6個系列，
分別為Eclipsc,Visual Indicator,Quartz,SolaR,Onxy,Hawkeye;

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                    EG96C23FA

QZE33C5R                    QN33D05SRA
QZE33E5R                    QX33R05SRA
QZE96C5R                    QN96D05SRA
QZE96E5R                    QX96R05SRA
QZI2JC2R                    QN2JC02SRA
QZM2VC2R                   QG2VC02SRA
QZM2VE2R                   QX2VE02SRA
QZM14C2R                   QG14C02SRA
QZM14E2R                   QX14E02SRA
QZP33C2R                   QN33C02SRA
QZP33E2R                   QX33E02SRA
QZP5OC2R                   QN5OC02SRA
QZP5OE2R                   QX5OE02SRA

SR2VS2LRS              QG2VC02SRA
SR33S5S1                QN33C05S1A
ON3311S2SR             AMI331HA02SRA
ON962HS2SR             AMI961DA02SRA or AMI961BA02SRA