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Crystal Engineering Corporation
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Measurement.Uncertainties.for.two.Temperature.(RTD100).Modules.without.Tare
The RTD100 module is capable of both temperature and resistance measurements. The resis-
tance measurement uncertainty can be calculated by combining the uncertainties of the two
Resistance measurements. The following table describes the combined uncertainty of two
RTD100 Module resistance measurements. The
uncertainty below is reported are without using
the Tare feature which will greatly improve your
measurement uncertainty as stated above.
To calculate the total uncertainty of the differential temperature measurement (
U
ΔT
) you must
combine the uncertainties of each the upper and the lower RTD100 and RTD sensor element
systems (
U
system
).
Calculate
U
system
for both the upper and lower RTD100 and RTD sensor element systems:
Calculate the total differential pressure uncertainty by the following method:
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Measurement.Uncertainties.for.two.Temperature.(RTD100).Modules.with.Tare
To determine the improved Tare function uncertainties it may be necessary to conduct an analy-
sis of the application. A suggested method of analysis is to Tare the ∆T reading when measuring
the isolated temperature at site A. Without resetting the Tare, measure the isolated site B tem-
perature and determine the error in your ∆T reading. Comparing these results would represent
the full range of ∆t readings that you would see in your application.
Module.Installation.Instructions
The nVision’s upper and lower bays allow for removal of modules in the field.
All module
changes should be completed in a dry, clean environment (out of the outdoor elements).
Proper electrostatic discharge (ESD) grounding techniques should be taken into account prior
to the module change over. If you desire to remove a module without installing a replacement,
a module blank plate (P/N: BNKPLT) must be installed to ensure your IP67 rating and to protect
the product.
WARNING:
Do not install two MA20 modules simultaneously as it
may permanently damage your nVision.
CAUTION:
Do not proceed unless you have a suitable replacement
module or blank plate for the module bay in question.
Upper RTD100 Module Uncertainties
(of R Ω)
0.015% + 0.02Ω
Lower RTD100
Module Uncertainties
(of R Ω)
0.015% + 0.02Ω
0.021% of Rdg + 0.03Ω
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