Nuclear Instrumentation FAQ Series - Calibration
Q. How are the nuclear measurement devices calibrated?
A. In simplest terms, calibration of a nuclear measurement device requires sampling the detector counts when the process is at a known condition of level or density and inputting those data points into the device.
Q. How do I collect data points for calibration?
A. The known condition of density should be determined by measuring a sample in the lab. On the other hand, the known condition of continuous level is determined with a two step process. First, one moves a survey meter up and down the outside of the vessel in front of the detector. Then the user inputs the process variable associated with that count rate via Ohmview, plicscom, Pactware, or HART® handheld device. The recommended number of data points varies with the application, but two data points is standard for density, while more are recommended for continuous level.
Q. What is the recommended best practice for recalibration of the detectors?
A. After an initial calibration, a one-point standardization routine is all that is recommended in the future. This should be performed at least every six months. In the case of process buildup on vessel walls or wear of the vessel, it may be necessary to recalibrate more frequently.
Q. Does VEGA provide calibration assistance?
A. Yes, we do. VEGA has certified factory technicians and many of our representatives also have factory-trained technicians working in different regions.
Q. Will the equipment be calibrated at the factory?
A. No, the equipment leaves the factory setup to make a repeatable measurement on the process. Plus, we perform a live calibration installation needed to ensure an accurate measurement.