SOR Multi Point RF Level Switch - Manual (Page 9)

Form 677 (05.13) ©SOR Inc. 9/36
Calculated Set up
Off (open) position
GND wire (shield drain)
Probe span pot
Probe loading LED
Probe lead
Range selection DIP switches
(On/closed position)
For Calculated set up, the capacitor substitution box is used to determine the picofarad
value of the process at two levels (A & B in the example
). Subsequent calculations
provide the rest of the values required for complete set up. See to locate adjustments
when setting up a remote mounted probe. See
p
to locate adjustments when setting up
an integrally mounted probe.
Level A must be separated from level B by at least 5% of the length to be sensed. (At least
5% of 30’ in the example.)
Units in Hazardous Locations — Prior to calibration, make sure that the
work area is declassifi ed before removing the explosion proof cover to
calibrate the unit. Failure to do so could result in severe personal injury or
substantial property damage.
Conditions required to begin Calculated set up:
 lnstrument installed with power applied.
 Process steady at Level A (10’ in the example
).
 Span pot fully CCW (25 turns CCW).
 Both range selection DIP switches off (open).
A sample worksheet is shown on page 13. The sample is filled out according to conditions
outlined in
. Level A must be greater than Level B for proper worksheet calculation. Any
unit of measure can be used with the Calculated Worksheet.
 Enter the measurement for maximum level on line 8 of the worksheet.
 Enter the value for level A on line 1 and the value for level B on line 2 of the
Calculated Worksheet.