P-600 SIC Analyzer Manual
Chapter I: Introduction
1
Chapter I: Introduction
Analyzer Overview
The Bartec Orb Model P-600 Salt in Crude Analyzer is an on-line instrument designed for the continuous
measurement of salt content in crude oil. Extremely rugged and simple to operate, the P-600 Salt in Crude
Analyzer combines rapid analysis, exceptional measurement accuracy, and unmatched operational
dependability to deliver highly reliable and repeatable salt content measurements.
•
Rapid analysis
— 5 minutes or less typical cycle time;
•
Superior repeatability
— ±2% of full scale or better;
•
Exceptional reliability
— better than 99% uptime.
For optimum installation and applications versatility, the P-600 Salt in Crude Analyzer incorporates a wide
variety of standard features, including:
•
Isolated, self-powered 4-20 mA analog output (optional second output available);
•
Three SPDT dry contact alarm relays;
•
Optional Modbus output (Ethernet TCP/IP or RS-485 RTU);
•
RS-232 serial output;
•
Separate electronics and measurement enclosures;
•
CSA/CUS Class I, Division1, Group B, C and D or ATEX II 2G Ex db IIB+H2 T6 Gb or
IECEx II 2G Ex db IIB+H2 T6 Gb
Principle of Operation
The P-
600 Salt in Crude Analyzer’s measurement technique is based on the ASTM Method D3230. This is
accomplished by using a digitally controlled syringe injection system, micro-volume solenoid valves, and a
measurement chamber equipped with a high-resolution conductivity probe, and temperature control.
Measurement chamber temperature is monitored and held constant at a programmed level (typically 50°C).
A typical measurement cycle takes about five minutes and is performed as follows:
1.
The sample cell is emptied by opening the cell’s drain solenoid valve and purge valve. The purge
air (at ~ 30 psi) removes any remaining fluid and/or vapors from the cell.
2. The sample valve is activated, and a precisely measured volume of crude oil (0.8mL sample loop)
is introduced into the tubing path to the measurement cell.
3. The digitally controlled syringe draws a precise volume of xylene (3.2mL) from the solvent tank
and injects it into the tubing path, pushing the crude sample into the measurement cell.
4. Next, the digitally controlled syringe draws a precise volume of alcohol (4mL) from the solvent
tank and injects it into the tubing path, pushing the remaining xylene into the measurement cell.
5. The mixer is activated to inject air into the tubing path, pushing the remaining alcohol into the
measurement cell.
6.
During the mix state, the air “stirs” the solution inside the cell.
7. The programmable counter for the read state allows the mixture to settle.
8. At the end, the conductance reading is taken, and Salt in Crude concentration is calculated and
reported.
9. The sample cell is emptied in the same way as in point #1.
10. The measurement cell and tubing are rinsed and cleaned with naphtha.