User's Manual

7ML19985GE01 SITRANS LC 500 – INSTRUCTION MANUAL Page 47
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Start Up
Example 2
For situations where the capacitance values are known in advance.
1. Switch on the 275 and establish connection with the SITRANS LC 500.
a. Select: Online
b. Select: Device setup
c. Select: Diag service
d. Select: Calibration
e. Select: Enter values
f. Select: PV LRV
2. Enter required capacitance value for 0% of the range.
a. Select: PV URV
3. Enter required capacitance value for 100% of the range.
a. Select: Send (the values are now sent)
b. Select: Put loop in manual
c. Select: Return loop to auto
Example 3
For situations where the capacitance values are unknown, and the level of the product
cannot be easily adjusted to 0% and 100%. In this case it is necessary to measure the
capacitance value at various levels. These values can be read in % with the 275
communicator.
1. Switch on the 275 and establish connection with the SITRANS LC 500.
a. Select: Online
b. Select: PV
c. The measured value can be read continuously, even if the current loop value is
min. or max.
2. Write down the measured value in pF, and record the corresponding level.
Example:
• the measured PV value is 181 pF at 79%
• the measured PV value is 52 pF at 17%
(181– 52)pF
= 2.08 pF per %.
(79 – 17)%
Note: The more accurately the values are measured at 0% and100%, the more
accurate the final result will be.