An analog input Characterization Module (CHARM) designed for a 4-20 mA, with or without HART, input.
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DeltaV™ AI 4-20 mA HART CHARM
DeltaV™ AI 4-20 mA HART CHARM
Specs
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, 24 V DC Power CHARM
Nominal Signal Range (span)
4-20 mA, (0-20 mA optional)
Full Signal Range
0 to 24 mA
Field Power (2-wire)
15.0 V at 20 mA @ 24 V DC input
Accuracy Over Temperature Range
0.1% of span (0-60°C), 0.25% of span (over -40 -70°C)
Repeatability
0.05% of span
Resolution
16 bit A/D converter
Input Impedance
250 Ω ±1%
Calibration
None required
Field Circuit Protection
30 mA Current Limiting circuit, Field wiring disconnect
CHARM Power Req.
36 mA max @ 24 V DC for two wire configuration, 12 mA max @ 24 V DC 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 for control
HART Data Update Rates
Update rates are faster than every second dependent on HART communication loading and device type
Resources
Features
- Eliminate marshalling and add I/O anywhere in the plant without affecting control room cabinets
- No marshalling cabinet or cross-wiring, fewer wires, much less work and fewer contact points for potential failures
- No marshalling cabinet or cross-wiring, fewer wires, much less work and fewer contact points for potential failures