Can I calibrate a Robertshaw Level Instrument without changing my process level?
For measurement of continuous level or point level with differential adjustment, you must change the process level unless you use the alternative calibration method. This alternative calibration method involves disconnecting the probe and inserting a capacitance signal into the instrument. This will require fixed capacitors or a pico-farad signal generator. The capacitance input must be calculated based on the dielectric of the process, geometry of the vessel, probe being used and mounting configuration. The Terminal Capacitance (see Question 5) must also be used for calculations. See example in the RF Level Controls Selection Guide. For point level measurement without differential, you must raise the level to the desired set point for calibration, unless you use our Model 5100. The Model 5100 has a special feature that allows you to calibrate the high level with the tank empty or below the desired trip point, or calibrate the low level with the tank full or above the desired trip poin
