Performance characteristics and test methods to be used for d.c. powered electrical transmitters with analogue direct current output used in differential pressure measurement.Cross References:BS 21BS 2011:Part 2.1ABS 2011:Part 2.1BBS 2011:Part 2.1CaBS 2011:Part 2.1EcBS 2011:Part 2.1FcBS 4568BS 5490