Liquefied Natural Gas (LNG) is a complex mixture of low-molecular-weight hydrocarbons with nitrogen as a principal inert impurity. Nowadays, the instrumentation control tools are needed in LNG Commercialization to ensure the LNG is safely transported, while minimizing the energy losses across the network. This research was a preliminary design that used LNG custody transfer control tools referred the ISO 8943:2007 standard. The temperature was measured by thermocouple (Rosemount transmitter 3144 series), while the pressure was measured using pressure transmitter (Rosemount transmitter 3051 series). The simulated signal temperature was done by temperature control box, while the simulated pressure was represented by WIKA pressure calibrator. Data from transmitter was sent to the LabVolt 9063 series that has data acquisition for Software Development Kit (SDK) enabled. Previously, the LabVolt 9063 did not recognized the signal from the transmitter. The SDK software bridged the LabVolt hardware with the LabView software. In the simulated system, temperature alarm will be triggered when the temperature value exceeds 20oC. For simulated pressure, the alarm will respond if pressure value exceeds 30 psi. From the results of this research, the communication between hardware and software worked properly. The data acquisition system was stable during the data collection stage, processing and displaying. In addition, the alarm indicator for both temperature and pressure was met within the threshold value.
Tulisan ini menganalisis tentang penggunaan kamera thermal imaging untuk pengecekan kebocoran refrigerant pada system refrigerasi. Dalam suatu prosedur perawatan sistem RHVAC, salah satu prosesnya merupakan pengecekan kebocoran pada pipa sistem RHVAC tersebut. Ada berbagai macam metode dalam melakukan pemeriksaan kebocoran pada sistem RHVAC. Pada tugas akhir ini akan dilakukan prosedur pemeriksaan kebocoran menggunakan metode yang jarang dipakai, yaitu menggunakan kamera thermal imaging. Alat ini dapat menangkap gambar suatu objek menggunakan radiasi inframerah sehingga distribusi temperatur objek tersebut dapat terlihat pada foto yang dihasilkan kamera thermal imaging ini. Pada suatu kebocoran fluida seperti refrigeran akan terjadi proses throttling yang menyebabkan adanya perbedaan temperatur fluida di dalam pipa dengan temperatur fluida yang keluar melewati lubang kebocoran. Dengan kamera thermal imaging hasil kebocoran dapat di deteksi, namun ada beberapa batasan dari kamera tersebut yang perlu diperhatikan dalam prosedur pengecekan kebocoran agar hasil yang didapatkan optimal.
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