RTD / Resistance input CHARM specifications

Installation notes

Specifications

Table: RTD Input CHARM specifications
Item Specification
Channel type RTD input
Sensor types Refer to Table: RTD Sensor type specifications
Sensor configuration 2, 3, or 4-wire
Full scale signal range Selectable based on sensor. Refer to Table: RTD Sensor type specifications
Accuracy over full temperature range Depends upon the sensor type. Refer to the temperature drift specification in Table: RTD Sensor type specifications
Repeatability 0.05% of span
Resolution Depends upon the sensor type. Refer to the resolution specification in Table: RTD Sensor type specifications
Calibration None required
Sensor excitation current
  • 0.5 mA in 2 and 4-wire configurations
  • 0.25 mA in 3-wire configurations
DC50/60 Hz common mode rejection 90 dB typical
Channel isolation RTD sensor input is galvanically isolated and factory tested to 1000 VDC.
Open sensor detection Yes
Input power requirements Total power requirement: +24 VDC ±10% at 22 mA maximum :
  • Input power from CIOC: +6.3 VDC ±3% at 32 mA maximum
  • +24 VDC input power: ±10% at 10 mA maximum
CHARM heat dissipation 0.30 W
Table: RTD sensor type specifications
Sensor type Operating range 25° reference accuracy Temperature drift Resolution
Pt100 -200 to 850°C ±0.25°C ±0.02° C/°C ~0.02°C
Pt200 -200 to 850°C ±0.25°C ±0.02° C/°C ~0.02°C
Pt500 -200 to 850°C ±0.25°C ±0.02° C/°C ~0.02°C
Pt1000 -200 to 260°C ±0.25°C ±0.02° C/°C ~0.01°C
Ni120 -80 to 260 °C ±0.15°C ±0.01° C/°C ~0.01°C
Ni100 -80 to 260 °C ±0.20°C ±0.01° C/°C ~0.01°C
Ni200 -80 to 260 °C ±0.20°C ±0.01° C/°C ~0.01°C
Ni500 -80 to 260 °C ±0.20°C ±0.01° C/°C ~0.01°C
Ni1000 -80 to 140 °C ±0.20°C ±0.01° C/°C ~0.01°C
Cu10 -200 to 260 °C ±0.25°C ±0.02° C/°C ~0.01°C
Resistance/user defined(1) 0 to 2,000 Ω ±0.25 Ω ±0.03 Ω/°C ~0.031 Ω
(1) The Callendar-Van Dusen linearization equation can be used with user defined Pt RTDs. Refer to Recommended I/O Practices in DeltaV Books online for usage information.

Wiring diagrams

Figure: RTD / Resistance CHARM wiring diagram


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