... reliability, dual relay output 4. Perfect anti-interference SNB Series: 1. Fit for kinds of Machinery Fields*Comprise of emitter( ... receiver, controller, connection cables and mounting fittings. 2. SNB series's specification * Fast response time <20ms.* LED indicator,easy ... axis pitch 20mm, 30mm, 40mm, 80mmProtection height=(xx-1)×light axis pitchSNBxx20 100,140,180,220......1420mmSNBxx30 150,210 ...