TEIP11 I/P (Current-to-Pressure) Signal Converter, Explosion Protection: The third digit ("3") suggests it has ATEX Ex ia IIC T6 or T4 Gb certification (Intrinsically Safe)., Design/Housing: The fourth digit ("3") indicates an aluminum field housing with IP 65 protection rating, suitable for wall or pipe mounting., Input Signal: The fifth digit ("2") specifies a standard electrical input signal of 4 to 20 mA (milliamperes)., Output Signal: The sixth digit ("2") specifies a standard pneumatic output signal of 3 to 15 psi (pounds per square inch)., Characteristic: The seventh digit ("1") indicates direct action (an increase in input current results in an increase in output pressure)., Ambient Temperature: The eighth digit ("1") indicates a wide operating temperature range of -40 to 85°C (-40 to 185°F)., Air Supply (Supply Pressure): The ninth digit ("5") indicates the unit is adjusted for a specific supply air pressure, likely around 1.4 bar (20 psi) or similar, depending on the full documentation.