Figure 84: pt100s with current excitation, Crbasic example 62. pt100s with current excitation – Campbell Scientific CR3000 Micrologger User Manual

Page 270

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Section 7. Installation

270

Conclusion: Limit is imposed by the resistance of the PRT. If resistance
of 5 PRTs is expected to sum below 5000 Ω (below an average of ≈0°C),
5 PRTs can be accommodated.

Figure 84: PT100s with current excitation

CRBasic Example 62. PT100s with Current Excitation

'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

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

Rs_Ro(z) = Rs(z) / Ro

'PRTCalc(Dest,Reps,Source,PRTType,Mult,Offset)

PRTCalc

(Deg_C,3,Rs_Ro(),1,1.0,0)

NextScan

EndProg