In order to resolve the unsteady concentration control brought by the pulp flow fluctuation due to valve operation, a new concentrationcontrol method is put forward based on the measurement of the increment relation between the concentration value and valve opening afteranalyzing the operation mechanism of the valve and concentration transmitter.

This paper presents a high stability method realized on high accuracy RTD temperature transmitter that works in environmental temperature range of --25℃ to +85℃.

The intelligent temperature transmitter with multi-type of thermocouple and RTD based on single-chip computer is developed to satisfy the needs of high-grade instruments and all-round function standby unit.

This paper introduces the hardware design of S series intelligent temperature transmitter,the realization of small signal acquisition and V/I transforming,the instrument software design and the design techniques.

The Design of a Capacitive Humidity Transmitter;

The classification of the humidity sensor is introduced,and the difference between the humidity sensor and the humidity transmitter is also discussed.