Protocontrol instruments [india] manufactures precision converters and transmitters for use in process control industries in a variety of models for specific applications. These signal convertors/isolators/transmitters are field devices which receive signal from field sensors like pt 100, thermocouple temperature sensor or load cell and convert these in applicable form like 4-20 ma, 0 20 ma, 0 10 v as an input for panel instruments. Many signals are generated such as motor current, armature voltage, position feedback in the field in form of change in resistance or signals obtained from various types of traducers in standard voltage or current form which are isolated from input and not suitable for transmission over long distance. The company manufactures precision converters to overcome problems in transmission such as line drop, interference, ground looping, non-compatibility to standard processing unit. The machines are available with salient features like complete galvanic isolation between input output and control supply; independent zero and span adjustments; stable current output eliminates need for special cable, shielding; robust cast aluminium and enclosure suitable for field mounting. These precision converters can be extensively used in cement, fertiliser, chemical and processing plants.
