This standard specifies tests designed to determine the performance of positioners with analog input signals and pneumatic output. The method of evaluation described in this standard specifies the use of an actuator of the user's or manufacturer's choice. The positioner may be single-acting or double-acting.

Purpose

The methods of evaluation given in this standard are intended for use by manufacturers of valve positioners to determine the performance of their products and by users or independent testing establishments to verify performance.

Test conditions in this standard, such as the range of ambient temperatures, power supply, etc., relate to conditions that commonly arise in use. Consequently, the values specified shall be used where no other values are specified by the manufacturer or user. If other values are used, they must be stated. It is recognized that the manufacturer's specifications and instructions for installation and operation must be considered during all tests.

Tests specified in this standard are not necessarily sufficient for instruments specifically designed for unusually arduous conditions. Conversely, a reduced series of tests may serve adequately for instruments designed to perform within a more limited range of conditions.

The evaluating body should maintain the closest communication with the user and the manufacturer. Note shall be taken of the manufacturer's specifications for the instrument when the test program is being decided, and manufacturers should be invited to comment both on the test program and upon the results pertaining to their instrument.