Campbell CR800 Series - Example: 100 Ω PRT in Four-Wire Half Bridge with Voltage Excitation (PT100; Brhalf4 W() )

Section 7. Installation
262
Excitation Ranges
CR6 CR800/CR1000 CR3000
±2500 mV ±2500 mV ±5000 mV
±2.000 mA
n/a
±2.500 mA
7.7.16.3 Example: 100 Ω PRT in Four-Wire Half Bridge with Voltage
Excitation (PT100 / BrHalf4W() )
FIGURE 65: PT100 BrHalf4W() Four-Wire Half-Bridge Schematic
Procedure Data
BrHalf4W() Four-Wire Half-Bridge Equations
X = RS / Rf
RS = Rf • X
VX = (VS • (Rf + RS + R1) / RS)
Bridge Resistor Values (mΩ)
R1 Rf
10000000 100000
Procedure
1. Build circuit
1
:
a. Use FIGURE: PT100 BrHalf4W() Four-Wire Half-Bridge Schematic
(p. 262)
as a template.