Campbell CR1000 User Manual

Section 7. Installation
Table 39. PRTCalc() Type-Code-5 Sensor
Honeywell Industrial Sensors, alpha = 0.00375 (Reference: Honeywell)
Constant Coefficient
a 3.8100000E-03
d -2.4080000E-06
e 1.6924100E-05
f -1.2040000E-06
g 2.1790930E+00
h -5.4315860E+00
i 9.9196550E+00
j 2.6238290E+02
Table 40. PRTCalc() Type-Code-6 Sensor
Standard ITS-90 SPRT, alpha = 0.003926 (Reference: Minco / Instrunet)
Constant Coefficient
a 3.9848000E-03
d -2.3480000E-06
e 1.8226630E-05
f -1.1740000E-06
g 1.6319630E+00
h -2.4709290E+00
i 8.8283240E+00
j 2.5091300E+02
7.9.15.2 PT100 in Four-Wire Half-Bridge
Example shows:
• How to measure a PRT in a four-wire half-bridge configuration
• How to compensate for long leads
Advantages:
• High accuracy with long leads
Example PRT specifications:
• Alpha = 0.00385 (PRT Type 1)
A four-wire half-bridge, measured with BrHalf4W(), is the best configuration for
accuracy in cases where the PRT is separated from bridge resistors by a lead
238

Campbell CR1000 Specifications

General

Power Requirements	9.6 to 16 VDC
Data Logger Operating System	CRBasic
Memory	4 MB
Analog Inputs	16 single-ended or 8 differential
Analog Input Resolution	13 bits
Analog Input Range	+/-2.5V
Digital I/O	8
Pulse Counters	2
Communication Ports	RS-232
Operating Temperature	-25°C to +50°C
Pulse Channels	4