Rtd Compatibility - Allen-Bradley SLC 500 1746-NR4 User Manual

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
100Ω
200W
Platinum 385 Platinum (385)
500W
1000W
100W
200W
Platinum (3916) Platinum 3916
500W
1000W
Copper (426) 10W
Nickel (618) 120W
Nickel (672) 120W
Nickel Iron (518) 604W
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.
The temperature range for the 1000W RTD is dependant on the excitation current.
Actual value at 0 C is 9.042W per SAMA standard RC21–4–1966.
Actual value at 0 C is 100W per DIN standard.
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.
Chapter 1
Overview
Temp. Range Temp. Range
(0.5 mA Excitation) (2.0 mA Excitation)
–200 C to +850 C –200 C to +850 C
(–328 F to +1562 F) (–328 F to +1562 F)
–200 C to +850 C –200 C to +850 C
(–328 F to +1562 F) (–328 F to +1562 F)
–200 C to +850 C –200 C to +850 C
(–328 F to +1562 F) (–328 F to +1562 F)
–200 C to +850 C –200 C to +240 C
(–328 F to +1562 F) (–328 F to +464 F)
–200 C to +630 C –200 C to +630 C
(–328 F to +1166 F) (–328 F to +1166 F)
–200 C to +630 C –200 C to +630 C
(–328 F to +1166 F) (–328 F to +1166 F)
–200 C to +630 C –200 C to +630 C
(–328 F to +1166 F) (–328 F to +1166 F)
–200 C to +630 C –200 C to +230 C
(–328 F to +1166 F) (–328 F to +446 F)
–100 C to +260 C
Not allowed.
(–148 F to +500 F)
–100 C to +260 C –100 C to +260 C
(–148 F to +500 F) (–148 F to +500 F)
–80 C to +260 C –80 C to +260 C
(–112 F to +500 F) (–112 F to +500 F)
–100 C to +200 C –100 C to +200 C
(–148 F to +392 F) (–148 F to +392 F)
Resolution Repeatability
 0.2 C
0.1 C
(0.2 F) ( 0.4 F)
 0.2 C
0.1 C
(0.2 F) ( 0.4 F)
 0.2 C
0.1 C
(0.2 F) ( 0.4 F)
 0.2 C
0.1 C
(0.2 F) ( 0.4 F)
 0.2 C
0.1 C
(0.2 F) ( 0.4 F)
 0.2 C
0.1 C
(0.2 F) ( 0.4 F)
 0.2 C
0.1 C
(0.2 F) ( 0.4 F)
 0.2 C
0.1 C
(0.2 F) ( 0.4 F)
 0.2 C
0.1 C
(0.2 F) ( 0.4 F)
 0.1 C
0.1 C
(0.2 F)
( 0.2 F)
 0.1 C
0.1 C
(0.2 F) ( 0.2 F)
 0.1 C
0.1 C
(0.2 F)
( 0.2 F)
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