Thermo Scientific DensityPRO NAI Series, User Manual

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Operation
Physical Inputs & Outputs
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18 DensityPRO User Manual Thermo Scientific
Physical Inputs
& Outputs
Analog (Current &
Voltage) Inputs
The function of an analog input is to connect external signals, such as temperature,
pressure, flow or density, to the gauge for conversion into a form to be used by the
internal measurement process. Further, the analog input signal in the gauge is mapped
to an input type such as temperature, pressure, flow, or density, and appropriate unit
and measurement ranges are assigned.
The analog inputs offer a way for the user to provide additional process information to
the gauge. This information may be used by the gauge to provided additional types of
measurements.
For a density application, the analog inputs will be used to provide temperature and
flow information. The temperature information may be used for temperature-
compensated density calculation. The flow information may be used for mass and/or
volume flow calculation.
Two types of analog inputs are available on the gauge: current inputs, labeled 4–20 In
1 and 4–20 In 2 on the main board, and voltage inputs, labeled Vdc In 1 and Vdc In 2
on the main board.
Note:
All four of the Current/Vdc Input tabs are essentially the same, except
the current tabs reference milliamps and the voltage tabs reference volts.
Current Tabs
Within the EZ Cal II software, select Current/Vdc Input from the menu tree on the
left to bring up the tabs containing the analog input tabs. The Current Input #1 (mA
#1) tab will display by default.