Emerson Rosemount5081, Инструкция по эксплуатации, Страница: 14 / 152

General specifications
(continued)
Table 2-1:
RFI/EMI EN-61326
Diagnostics (may slightly vary based
on measurement type) • Calibration error
• Low temperature error
• High temperature error
• Sensor failure
• Line failure
• CPU failure
• Calibration error
• Zero error
• Temperature slope error
• Sensor failure
• ROM failure
• Input warning
Once one of the above warnings/faults are diagnosed, the LOI will display a
message describing the failure detected.
Digital communications
HART Table 2-2:
Power and load requirements Supply voltage at the transmitter terminals should be at least 12 Vdc. Power supply
voltage should cover the voltage drop on the cable plus the external load resistor re-
quired for HART communications (250 Ohms minimum). Minimum power voltage is
12 Vdc. Maximum power voltage is 42.4 Vdc (30 Vdc for intrinsically safe operation).
The graph shows the supply voltage required to maintain 12 Vdc (upper line) and 30
Vdc (lower line) at the transmitter terminals when the current is 22 mA.
Analog output Two-wire, 4-20 mA output with superimposed HART digital signal, scalable over the op-
erating range of the sensor.
Output accuracy ±0.05 mA
Variables assignable to pH, Temperature, mV, Glass impedance, Reference impedance, RTD resistance, ORP,
Conductivity, Resistivity, Concentration, Raw conductivity, Chlorine, Dissolved oxygen,
and Ozone
Description and specifications
4 Rosemount 5081