Natural gas: On-site calibration optimised at the metering skid

On-site calibration of measuring instruments is frequently very time-consuming and expensive. This is also true for applications with several measurands. One example of this is the metering skid, something for the custody transfer measurement of the amount of natural gas transferred. A worldwide player in the market from Saudi Arabia has significantly streamlined the testing process at this stage: with the multi-functional CPH8000-P1 calibrator from WIKA, a ?calibration laboratory in a case?.
The center of a metering skid is the flow computer. It processes the information from all of the measuring instruments and calculates the precise amount of gas that flows to the client. Gas is compressible, therefore the tabs on pressure and temperature during gas transfer plays an essential role.
Verification is the law
Because even small measuring errors could cause noticeable losses in turnover, the measuring instruments must be calibrated regularly. This is usually done at the facility. Each on-site calibration must be verified in accordance with regulations. This implies proving consistent repeatability of the test results and traceability to the assigned references. Furthermore, the regulations require the test equipment to be approved for used in hazardous areas.
In view of certain requirements, the calibration personnel of WIKA customers previously had to use many different devices in order to adequately fulfil their tasks. Besides pressure and temperature calibrators, this included a pneumatic pump for the test pressure, a HART� communicator and a resistance decoder. The on-site calibration cost effort and time accordingly.
Festive -P1 multi-functional calibrator significantly reduces the effort necessary for on-site calibration.
Four measuring channels
The gas company in Saudi Arabia has reduced this effort in a single fell swoop with the CPH8000-P1 portable multi-function calibrator from WIKA. The case-mounted instrument calibrates pressure measuring instruments and resistance thermometers and thermocouples. The test pressure is generated having an integrated pump. The CPH8000-P1 has four measuring channels. It can thus perform and display up to four measurements simultaneously. The ATEX-approved version also supplies the test items and reference sensors in the metering skid with voltage (DC 24 V) without danger.
Documentation without problems
Through the test procedure, the CPH8000-P1 ? via its integrated HART� module ? communicates directly with the measuring instruments, which are also HART�-capable. Its powerful data logger and the very large memory capacity support an individual in the next documentation of the on-site calibration. The unit provides all the details relevant for verification.
Note
Detailed information on the model CPH8000 multi-function calibrators can be acquired on the WIKA website. Each instrument has a modular design and can therefore be specified for the respective selection of applications. In case you have any more questions, your contact will gladly assist you to.

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