Encoder enables analogue variables to be manually adjusted from within a hazardous area. This intrinsically safe rotary encoder is panel mounting with a quadrature switch contact output that may be directly connected to any instrument that accepts a three-wire input.

Originally developed for use with an intrinsically safe BEKA BA427E manual set point station, the BA490 is equally useful for manual adjustment of PLC variables and controller setpoints in both hazardous and safe areas.
The BA490 encoder is a robust panel mounting rotary control knob with a quadrature switch contact output, suitable for installation in hazardous or safe process areas. It is designed for easy adjustment by a gloved hand and may be directly connected to almost any instrument that accepts a three-wire quadrature input to provide a simple way of making adjustments
from within the process area. The encoder contains two single pole switches that open and close 90 degrees out of phase with each other as the control knob is rotated. This
enables both the position and direction of rotation to be determined. If switch ‘A’ leads switch ‘B’, the knob is rotating in a clockwise direction, if ‘B’ leads ‘A’, the knob is rotating in a counterclockwise direction. A common application for the BA490 encoder is to provide rotary manual control of a BEKA BA427E or BA627E 4/20mA output Set Point Station.
Normally the output current of these generators is controlled by the front panel ▼ and ▲ push buttons, but direct connection of the BA490 rotary encoder enables an operator to make
adjustments via the conventional rotary control knob.

Type : absolute
Technology : photoelectric, magnetic
Construction : panel-mounted
Output signal : analog
Supply voltage : 5VDC
Protection level : robust, intrinsically safe, for hazardous areas, IP65, IP20
Other characteristics : with integrated limit switch
Process temperature : Max.:
Incremental encoder résolution (pulses per revolution : 12 unit