Crystal nVision Lab Reference - Manual (Page 35)

Modules  33
nVision Operation Manual
To calculate the total uncertainty of the differential temperature measurement (
U
ΔT ) you must combine the uncertainties of the upper and lower RTD100
and RTD sensor element systems (
U
system ).
Calculate
U
system for the upper and lower RTD100 and RTD sensor element systems: Calculate the total differential pressure uncertainty:
Differential Temperature Measurement Uncertainties with Tare
To determine the improved Tare function uncertainties it may be necessary to conduct an analysis of the application. A suggested method of analysis is to
Tare the ΔT reading when measuring the isolated temperature at site A. Without resetting the Tare, measure the isolated site B temperature and determine the
error in your ΔT reading. Comparing these results would represent the full range of Δt readings that you would see in your application.
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TEMPERATURE (RTD100) MODULE SPECIFICATIONS
Accuracy
0% to 100% of Full Scale . . . . . . . . . ±(0.015% of reading + 0.02Ω)
Accuracy specifications include all effects of linearity, hysteresis, repeatability, temperature, and stability within the specified operating temperature range
for one year.
Note: Exposure to environmental extremes of temperature, shock, and/or vibration may warrant a more frequent recertification period.
Ranges, Resolutions, and Units
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 400Ω for use with 100Ω PRT (platinum resistance temperature detectors)
Resolution . . . . . . . . . . . . . . . . . . . . . . . 0.01 on all scales
Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . ºC, K, ºF, R, and Ω
Wiring Types and TCRs
Wiring Types . . . . . . . . . . . . . . . . . . . . . 2-, 3-, or 4-wire
Available TCR Selections: 0.00385, 0.003911, or 0.003926
Connection
 RTD Sensor Connector Interface
P/N 3953: RTD Connection Kit (one IP67 terminal block connector) (equivalent to Phoenix Contact Order Number: 1501265,
or Part Number: SACC-M8MS-4CON-M-SM, or Binder P/N: 99-3383-100-04)
Cable Diameter. . . . . . . . . . . . . . . . . . 3.5 to 5.0mm [0.14 to 0.012 in] with smooth, continuous covering adequate for IP67 sealing
Stranded Conductor Cross Section . . . . . . . . 0.14 to 0.5mm 2 [0.0002 to 0.0008 in 2 ]