Allen-Bradley SLC 500 1746-NR4, User Manual

Page: 18 / 134

Chapter 1
Overview
1–3
RTD Compatibility
Table 1.A lists the RTD types you can use with the RTD module and gives
each type’s associated temperature range, resolution, and repeatability
specifications. Table 1.B shows the accuracy and temperature drift
specifications for the RTDs.
Table 1.A
RTD Temperature Ranges, Resolution, and Repeatability
RTD Type
Temp. Range
(0.5 mA Excitation)
➁
Temp. Range
(2.0 mA Excitation)
➁
Resolution Repeatability
100
Ω
–200
°
C to +850
°
C
(–328
°
F to +1562
°
F)
–200
°
C to +850
°
C
(–328
°
F to +1562
°
F)
0.1
°
C
(0.2
°
F)
0.2
°
C
( 0.4
°
F)
Platinum 385
➀
200
W
–200
°
C to +850
°
C
(–328
°
F to +1562
°
F)
–200
°
C to +850
°
C
(–328
°
F to +1562
°
F)
0.1
°
C
(0.2
°
F)
0.2
°
C
( 0.4
°
F)
Platinum (385)
➀
500
W
–200
°
C to +850
°
C
(–328
°
F to +1562
°
F)
–200
°
C to +850
°
C
(–328
°
F to +1562
°
F)
0.1
°
C
(0.2
°
F)
0.2
°
C
( 0.4
°
F)
1000
W
–200
°
C to +850
°
C
(–328
°
F to +1562
°
F)
–200
°
C to +240
°
C
(–328
°
F to +464
°
F)
0.1
°
C
(0.2
°
F)
0.2
°
C
( 0.4
°
F)
100
W
–200
°
C to +630
°
C
(–328
°
F to +1166
°
F)
–200
°
C to +630
°
C
(–328
°
F to +1166
°
F)
0.1
°
C
(0.2
°
F)
0.2
°
C
( 0.4
°
F)
Platinum 3916
➀
200
W
–200
°
C to +630
°
C
(–328
°
F to +1166
°
F)
–200
°
C to +630
°
C
(–328
°
F to +1166
°
F)
0.1
°
C
(0.2
°
F)
0.2
°
C
( 0.4
°
F)
Platinum (3916)
➀
500
W
–200
°
C to +630
°
C
(–328
°
F to +1166
°
F)
–200
°
C to +630
°
C
(–328
°
F to +1166
°
F)
0.1
°
C
(0.2
°
F)
0.2
°
C
( 0.4
°
F)
1000
W
–200
°
C to +630
°
C
(–328
°
F to +1166
°
F)
–200
°
C to +230
°
C
(–328
°
F to +446
°
F)
0.1
°
C
(0.2
°
F)
0.2
°
C
( 0.4
°
F)
Copper (426)
➀➂
10
W
Not allowed.
➄
–100
°
C to +260
°
C
(–148
°
F to +500
°
F)
0.1
°
C
(0.2
°
F)
0.2
°
C
( 0.4
°
F)
Nickel (618)
➀➃
120
W
–100
°
C to +260
°
C
(–148
°
F to +500
°
F)
–100
°
C to +260
°
C
(–148
°
F to +500
°
F)
0.1
°
C
(0.2
°
F)
0.1
°
C
( 0.2
°
F)
Nickel (672)
➀
120
W
–80
°
C to +260
°
C
(–112
°
F to +500
°
F)
–80
°
C to +260
°
C
(–112
°
F to +500
°
F)
0.1
°
C
(0.2
°
F)
0.1
°
C
( 0.2
°
F)
Nickel Iron (518)
➀
604
W
–100
°
C to +200
°
C
(–148
°
F to +392
°
F)
–100
°
C to +200
°
C
(–148
°
F to +392
°
F)
0.1
°
C
(0.2
°
F)
0.1
°
C
( 0.2
°
F)
➀
The digits following the RTD type represent the temperature coefficient of resistance (
α
), which is defined as the resistance change
per ohm per
°
C. For instance, Platinum 385 refers to a platinum RTD with
α
= 0.00385 ohms/ohm –
°
C or simply 0.00385 /
°
C.
➁
The temperature range for the 1000
W
RTD is dependant on the excitation current.
➂
Actual value at 0
°
C is 9.042
W
per SAMA standard RC21–4–1966.
➃
Actual value at 0
°
C is 100
W
per DIN standard.
➄
To maximize the relatively small RTD signal, only 2 mA excitation current is allowed.
Important: The exact signal range valid for each input type is dependent
upon the excitation current magnitude that you select when
configuring the module. For details on excitation current, refer
to page ii.