Product data

DeltaV Product Data Sheet
October 2014 – Page 15 S-Series Electronic Marshalling
Analog Input 4-20 mA HART CHARM
Specifications for AI 4-20 mA HART CHARM
Sensor Types 4-20 mA with or without HART
0-20 mA
Supports 2-wire and 4-wire device types directly
Supports 3-wire device powered through the 24VDC Power
CHARM
Nominal signal range (span) 4-20 mA, (0-20 mA optional)
Full signal range 0 to 24 mA
Input Impedance 250 Ω ±1%
Field Power (2-wire) 15.0 V at 20 mA @ 24 VDC input
Accuracy over temperature range 0.1% of span (0-60º C)
0.25% of span (over -40 -70º C)
Repeatability 0.05% of span
Resolution 16 bit A/D converter
Calibration None required
DC/50/60 Hz Common mode
rejection
N/A
Field Circuit Protection
- 30 mA Current Limiting circuit
- Field wiring disconnect
CHARM power req. 36 mA max @ 24 VDC for two wire configuration
12 mA max @ 24 VDC for three and four wire configuration
CHARM Heat Dissipation 0.33 W
HART support HART v7 pass-through for AMS
HART v7 variable and device status available to control
HART data update rates 500 ms
Simplified Circuit and Connection Diagrams for AI HART CHARM 0/ 4 to 20 mA Two Wire and Four Wire transmitters