THE UPGRADED CONTROL SYSTEM OF PRIMARY LIQUID FLOW MEASUREMENT STANDARD AT NIMT |
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| T. Chinarak, K. Leetang, T. Changpan |
- Abstract:
- The liquid piston provers have been widely used as the primary standard for liquid flow measurement. There are many flowmeters which can be used with the prover such as turbine flowmeters, variable area flowmeters, electromagnetic flowmeters, etc. The flowrates from the prover are measured by volumetric method. Thus, the displaced volume of water and the moving distance of the piston during measurement are the key factors. In order to receive the accurate volume, the efficient system for gaining pulses from the linear encoder is needed. Also, temperature and pressure of liquid inside the piston cylinder and the environmental conditions are involved with the measurement. Recently, the piston prover at NIMT had been upgraded by replacing the out-of-date control system and modifying the key equipments; linear encoder, PT-100 and digital manometer. Moreover, the well-known method called ‘water draw’ has been brought to verify the new system and provides the piston prover constant value. The uncertainty of the system is evaluated and reported as 0.07% (k = 2).
- Keywords:
- liquid piston prover, primary standard, turbine, variable area, flowmeter, electromagnetic, volumetric method, water draw, uncertainty
- Download:
- IMEKO-TC9-2013-047.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC9
- Event name:
- FLOMEKO 2013
- Title:
16th International Flow Measurement Conference
- Place:
- Paris, FRANCE
- Time:
- 24 September 2013 - 26 September 2013