Thermo Scientific DensityPRO NAI Series, Руководство пользователя

Страница: 20 / 196

Thermo Scientific
DensityPRO User Manual
A- x
x
– Pipe inside diameter
– Mea #1 reading for 20.00 mA output
– Mea #1 reading for 4.000 mA output
– Position of decimal in readout 1
– Cal density point 1
– Standardization and/or Calibration
Standardization
There are four methods of standardization: on water, on process, deferred, and other.
Standardization on water is the most common standardization method. In this case,
Cal density point 1 would be .9982 (density of water at 20°C).
Standardization can be done on process by taking process samples during the
standardization cycle. The average of these samples is then entered into the Cal density
point 1. In many cases, no other calibration is needed for the gauge to operate
satisfactorily.
Standardization may be deferred if the process is running and cannot be stopped to
standardize on water or empty pipe. When standardization is deferred, the
standardization is skipped and a calibration is done in the same manner
standardization on process is done. At any time later, the standardization can be done
on water or an empty pipe.
Other methods of standardization are on an empty pipe and on fluid other than the
process. When either of these other methods is used, a first point calibration must be
done on process. The standardization in this case is not associated with any process
density. It is only a repeatable radiation condition. The first point calibration is
associated with the standardization through the first point calibration density and a
CAL/STD ratio where the ratio is equal to the signal at the calibration density divided
by the standardization signal.
Quick Setup
Quick Setup
The procedures described in this section assume you will access the
menu items
directly.
Setup
The minimum data needed to make a density measurement is listed below.