P-600 SIC Analyzer Manual
Chapter VI: Maintenance & Service
47
3. The other data point should be outside the expected range and can be obtained through linear
extrapolation (most calibration curves seen are linear or near linear).
Example (0-75 PTB calibration):
Take conductance for “0” Salt in Crude concentration from the current table or Factory QIR.
Take conductance reading from Main run screen and Salt in Crude concentration from the lab.
Use the following formula to calculate higher Salt in Crude concentration data point:
Slope = (Conductance
₂
- Conductance
₁
) / (SiC
₂
- SiC
₁
)
Intercept = 15.8 (zero point)
Calculated Conductance = Desired SiC x Slope + Intercept
Slope = (53.8
– 15.8) / (32 – 0) = 1.1875
Calculated Conductance = 75 x 1.1875 + 15.8 = 104.9 (rounded up)
SiC (PTB)
Conductance (µS)
0
15.8
32 (from the Lab)
53.8 (from the Analyzer)
75 (new point)
104.9 (calculated)
Troubleshooting
Problem / Symptom
Cause
Corrective Action
Display blank
No electrical power to the Analyzer
Screen saver activated
Faulty display or display PCB
Apply electrical power
Touch keypad with magnetic
pencil
Replace as required