HART Tri-Loop HART-to-Analog Signal Converter
5-2
Load Limitations
Loop resistance is determined by the voltage level of the external power
supply, as described by:
Temperature Limits
Ambient
50 to 104 °F (10 to 40 °C).
Storage
–40 to 158 °F (–40 to 70 °C).
Humidity Limits
0–95% non-condensing relative humidity.
Failure Mode Alarm
If Tri-Loop diagnostics detect a transmitter malfunction or a Tri-Loop
failure, the analog signal will be driven either below 3.75 mA or above
21.75 mA to alert the user. The high or low alarm signal is selectable by
the Tri-Loop Model Number.
Performance
Specifications
NOTE
The performance specifications below are for the HART Tri-Loop only.
Reference Accuracy
±0.045% of span.
Ambient Temperature Effect per 50 °F (28 °C)
±0.15% of span.
Stability
±0.1% of span for 12 months.
Analog Output Update
Tri-Loop responds to every HART burst update.
(Typical transmitter burst update rate: 0.3 to 0.5 s.)
Tri-Loop Response Time (after each burst update)
Channel 1–120 ms; Channel 2–220 ms; Channel 3–320 ms.
Total Response Time
Typical response time from sensor change to transmitter to Tri-Loop
analog update: 0.7 to 1.0 s.
Physical Specifications
Electrical Connections
Screw clamps. Accepts 24-12 AWG solid or stranded wire.
Dimensions
1.57
3
3.11
3
3.36 in. (40
3
79
3
85,5 mm)
DIN Rail Mounting Options
Asymmetrical 32mm G rail, symmetrical 35
3
7.5 mm top hat rail, or
symmetrical 35
3
15 mm top hat rail.
Weight
0.27 lb (0,12 kg)
1427
1200
1000
800
600
400
200
0
10
20
42.4
Lo
ad
(Oh
m
s)
30
Max. Loop Resistance = Power Supply Voltage–11.0
0.022
Power Supply Voltage, V dc
40
Operating Region
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