scholarly journals APLIKASI OTOMATISASI POMPA KIMIA OKSIDATOR MENGGUNAKAN MODUL PLC SRB201FU PADA UNIT PENYARINGAN PENDAHULUAN ARSINUM SWRO

2021 ◽  
Vol 13 (2) ◽  
pp. 182-193
Author(s):  
Imam Setiadi ◽  
Ayudia Mutiara Fani
Keyword(s):  
Pressure Switch

Kebutuhan masyarakat terhadap air minum yang berkualitas serta akses yang mudah untuk mendapatkanya dan kesadaran mengkonsumsi air minum yang sehat, mendorong semakin banyak inovasi teknologi penyediaan air minum mulai dari yang sederhana bersifat konvensional hingga teknologi modern. Didalam teknologi modern, agar dapat beroperasi dengan baik perlu adanya kontrol yang baik agar unit mesin penyedia air itu dapat bekerja maksimal dan berkesinambungan. Tujuan penelitian ini adalah untuk merancang kontrol  otomatisasi pompa oksidator pada unit penyaringan pendahuluan menggunakan modul PLC agar menjaga efisisiensi suplai bahan kimia oksidasi pada air baku Arsinum. Metode yang digunakan pada aplikasi ini adalah kombinasi 1 buah pressure switch, 2 buah level kontrol pada tangki air baku dan tangki air bersih serta 1 buah modul plc smart relay SRB121FU untuk mengontrol pompa injeksi larutan oksidator bekerja bersamaan dengan pompa air baku ketika melakukan penyaringan. Hasil penelitian menunjukkan bahwa pemasangan modul PLC Smart Relay dapat mengontrol tangki air baku dan tangki air bersih pada proses pretreatment sehingga dapat diperoleh efisiensi pemakaian bahan kimia oksidator pada penolahan air minum ini secara keseluruhan.

A SYSTEM FOR PROTECTING AN OIL DIFFUSION PUMP AGAINST FAILURE OF THE MECHANICAL FORE PUMP, COOLING WATER, OR ELECTRICITY

1970 ◽  
Vol 28 ◽  
pp. 344-345
Author(s):  
W. C. Bigelow ◽  
F. B. Drogosz ◽  
S. Nitschke
Keyword(s):  
High Vacuum ◽  
Cooling Water ◽  
Effective Protection ◽  
Pump Line ◽  
Diffusion Pump ◽  
System Pressure ◽  
Control Relay ◽  
Vacuum Systems ◽  
Vacuum Gage ◽  
Pressure Switch

High vacuum systems with oil diffusion pumps usually have a pressure switch to protect against Insufficient cooling water; however, If left unattended for long periods of time, failure of the mechanical fore pump can occur with equally serious results. The device shown schematically in Fig. 1 has been found to give effective protection against both these failures, yet it is inexpensive and relatively simple to build and operate.With this system, pressure in the fore pump line is measured by thermocouple vacuum gage TVG (CVC G.TC-004) whose output is monitored by meter relay MRy (Weston 1092 Sensitrol) which is set to close if the pressure rises above about 0.2 torr. This energizes control relay CRy (Potter & Brumfield KA5Y 120VAC SPDT) cutting off power to solenoid-operated fore line valve Vf (Cenco 94280-4 Norm. Closed) which closes to prevent further leakage of air into the diffusion pump

scholarly journals Experimental Investigation and Mathematical Modelling of Pressure Transfer Function for Air Compressor

2018 ◽  
Vol 7 (4.19) ◽  
pp. 950
Author(s):  
Mishaal A. AbdulKareem
Keyword(s):  
Pressure Response ◽  
Compressed Air ◽  
Operating Pressure ◽  
Perfect Gas ◽  
Cross Sectional ◽  
Air Compressor ◽  
Output Pressure ◽  
Sinusoidal Functions ◽  
Good Agreement ◽  
Pressure Switch

A mathematical model is developed to estimate the pressure response of an insulated electric air compressor. A pressure switch is modeled as a comparator and the electric motor as an amplifier. It is assumed that the compressed air is a perfect gas when applying the isentropic process. In addition, the effect of a step, ramp and sinusoidal functions of disturbance signals on the air pressure has been studied.  A good agreement was obtained when comparing the predicted results with the measured values obtained from the experimental test that was done using a (1.32 kW, 23 litter and 8 bar) electric reciprocating air compressor. In addition, the same behavior of the predicted results was obtained when compared with results of a previously published article. It was found that the time constant of this control system is directly proportional with the value of the spring constant that is inserted inside the pressure switch and with the volume of air storage vessel, and it is inversely proportional with the gain of the amplifier and with the effective cross-sectional area of the pressure switch diaphragm and it is independent of the value of operating pressure set point. In addition, when the value of disturbance signal is positive, it will increase the output pressure response and when it is negative, it will decrease it. 

Time-Pressure Switch Control for Fluid Dispensing Process Based on Self-Adaptive Model

2013 ◽  
Vol 397-400 ◽  
pp. 91-96
Author(s):  
Cong Ping Chen ◽  
Tao Zhang ◽  
Shi Jie Guo
Keyword(s):  
Time Pressure ◽  
Control Method ◽  
Residual Pressure ◽  
Adaptive Model ◽  
Chamber Volume ◽  
Switch Control ◽  
Air Chamber ◽  
High Degree ◽  
Pressure Switch ◽  
Self Adaptive

Because of changes of the epoxy amount in syringe and air compressibility, the time-pressure dispensing has proven to be a challenging task in achieving a high degree of consistency in the dispensed liquid dots volume. Taking residual pressure and non-Newtonian fluid into consideration, a self-adaptive model of the dispensed liquid dots volume was developed for the whole dispensing process. Based on the liquid dots volume model, combined with the syringe air chamber volume prediction model, a time-pressure switch control method was put forward following the principle of time preference control. Numerical simulation has been conducted in the MATLAB using the conventional PI algorithm. Results show that the self-adaptive model can be very well response to the influences of air chamber volume changes to the dispensed liquid dots volume and the proposed control method can significantly improve the dots volume consistency.

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