The MTL5521 converts a frequency or rotational speed signal from a proximity detector located in the hazardous area into a 0/4–20mA current signal suitable for driving safe area loads. A display located on the top indicates the frequency.

• Output current either 0–20mA or 4–20mA

• 0/4mA and 20mA frequency values

• Line fault detection: Off, wire-break and/or short circuit

• Upper and lower threshold values of the set point relay (including hysteresis)

• Start uptime delay 0 to 1000s

• Filter time constant

• Scaling factors