Micronor's ZapFREE(tm) fMR310 Fiber Optic Rotary Encoders offers 100% passive optical design, EMI immunity, operation at extreme temperatures, resolution to 1024ppr and link lengths up to 2000 meters. These position sensors feature quadrature outputs, serial interface and two programmable analog outputs (+/-10V and 4-20mA, independently programmable for Posiion or Speed output). Ideal for use in all forms of harsh and/or hazardous environments - including outdoor lightning. ATEX classification as Simple Apparatus for use in mines and all other hazardous locations or explosive atmospheres.