
Section 7. Installation
270
Conclusion:LimitisimposedbytheresistanceofthePRT.Ifresistance
of5PRTsisexpectedtosumbelow5000Ω(belowanaverageof≈0°C),
5PRTscanbeaccommodated.
Figure 84: PT100s with current excitation
CRBasicExample62. PT100swithCurrentExcitation
'See FIGURE. PT100s with Current Excitation (p. 270) for wiring diagram.
Public Rs(3), Rs_Ro(3)
Public Deg_C(3)
Const Ro = 100
Public z
BeginProg
Scan(1,Sec,0,0)
'Resistance(Dest,Reps,Range,InputChan,IExChan,MPE,ExuA,RevEx,RevDiff,
' SetTime,Integ,Mult,Offset)
Resistance(Rs(),3,mV200,1,Ix1,3,1000,True,True,0,250,1.0,0)
For z = 1 To 3
Rs_Ro(z) = Rs(z) / Ro
Next z
'PRTCalc(Dest,Reps,Source,PRTType,Mult,Offset)
PRTCalc(Deg_C,3,Rs_Ro(),1,1.0,0)
NextScan
EndProg
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