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 may be the metering skid, a system 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 time: 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 info from all the measuring instruments and calculates the exact amount of gas that flows to the customer. Natural gas is compressible, therefore the monitoring of pressure and temperature during gas transfer plays a crucial role.
Verification is the law
Because even small measuring errors could cause noticeable losses in turnover, the measuring instruments must be calibrated regularly. Normally, this is done at the facility. Each on-site calibration must be verified in accordance with regulations. This means proving consistent repeatability of the test results and traceability to the assigned references. In addition, the regulations require the test equipment to be approved for use in hazardous areas.
In view of certain requirements, the calibration personnel of WIKA customers previously had to use many different pieces of equipment so as to adequately fulfil their tasks. As well as 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 time and effort accordingly.
The CPH8000-P1 multi-functional calibrator significantly reduces the effort necessary for on-site calibration.
Four measuring channels
The natural gas company in Saudi Arabia has reduced this effort in one fell swoop with the CPH8000-P1 portable multi-function calibrator from WIKA. The case-mounted instrument calibrates pressure measuring instruments as well as 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 around 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
During the test procedure, the CPH8000-P1 ? via its integrated HART� module ? communicates directly with the measuring instruments, which may also be HART�-capable. Its powerful data logger and the large memory capacity support the user in the next documentation of the on-site calibration. The unit provides all the details relevant for verification.
Note
Detailed info on the model CPH8000 multi-function calibrators can be acquired on the WIKA website. Bootleg includes a modular design and can therefore be specified for the respective selection of applications. In case you have any further questions, your contact will gladly assist you to.

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