IEC 61514:2000 pdf download-Industrial-process control systems – Methods of evaluating the performance of valve positioners with pneumatic outputs.
The test values shall be corrected back to the standard reference atmosphere conditions listed above. The standard reference atmosphere is equivalent to the normal reference operating conditions commonly identified by the manufacturer. It is recognized that there may not be a factor to correct for humidity. When measurements within the recommended range of ambient conditions are unsatisfactory, and the correction factors to adjust parameters to the standard atmosphere are unknown, repeat measurements (referee measurements) may be conducted under the conditions listed in table 1 , a or b, or other reference operating conditions identified by the manufacturer. NOTE Special equipment may be required to maintain the basic test conditions within the limits specified. 4.1 .1 Recommended limits of ambient conditions for test measurements Electromagnetic field: value to be stated, if relevant. Maximum rate of change of ambient temperature permissible during any test: 1 °C in 1 0 min, but not more than 3 °C/h. 4.2 Supply conditions 4.2.1 Reference values Electrical supply: the values specified by the manufacturer. Pneumatic supply: the values specified by the manufacturer, or a supply pressure of 4,0 bar (400 kPa).
5 General testing procedures 5.1 Test equipment When the accuracy rating of the reference measuring means is one-tenth or less than that of the device under test, the accuracy rating of the reference measuring means may be ignored in calculations, but shall be reported. When the accuracy rating of the reference measuring means is one-third or less, but greater than one-tenth of that of the device under test, the accuracy rating of the reference measuring means shall be stated in the report. 5.2 Test methods Specific test methods and test configurations are described separately in clause 6. 5.3 Testing precautions Unless affecting the influence condition being tested, the following conditions shall apply. An adequate time, as specified by the manufacturer, shall be allowed after switching on the power supply in order to allow stabilization of the positioner and/or associated test equipment. In the absence of a manufacturer specification, a period of at least 1 5 min shall be allowed (at least 30 min for electrical supplies).