185
Specifications and Reference Data
Specifications and Reference Data
March 2016
Reference Manual
00809-0300-4750, Rev CA
A.2.2 Advanced diagnostics capabilities
Basic
Self test
Transmitter faults
Analog output test
Pulse output test
Tunable empty pipe
Reverse flow
Coil circuit fault
Electronics temperature
Process diagnostics (DA1)
Ground/wiring fault
High process noise
SMART Meter Verification (DA2)
SMART Meter Verification (on-demand)
4-20 mA loop verification
A.2.3 Output signals
Analog output adjustment
4–20 mA, switch-selectable as internally or externally
powered.
Analog loop load limitations
Internally powered 24 VDC max, 500 ohms max loop
resistance
Externally powered 10.8 - 30 VDC max.
Loop resistance is determined by the voltage level of the
external power supply at the transmitter terminals.
Figure A-6. Analog Loop Load Limitations
The analog output is automatically scaled to provide 4mA
at lower range value and 20 mA at upper range value. Full
scale continuously adjustable between -39 and 39 ft/s
(-12 to 12 m/sec), 1 ft/s (0.3 m/s) minimum span.
HART communications is a digital flow signal. The digital
signal is superimposed on the 4–20 mA signal and is
available for the control system interface. A minimum of
250
Ohms loop resistance is required for HART
communications.
Scalable pulse frequency adjustment
0-10,000 Hz, switch-selectable as internally or externally
powered. Pulse value can be set to equal desired volume in
selected engineering units. Pulse width adjustable from 0.1
to 650 ms.
Internally powered: Outputs up to 12 VDC
Externally powered: Input 5 - 28 VDC
Output testing
Analog output test
Transmitter may be commanded to supply a specified
current between 3.5 and 23 mA.
Pulse output test
Transmitter may be commanded to supply a specified
frequency between 1 and 10,000 Hz.
Optional discrete output function (AX option)
Externally powered at 5 - 28 VDC, 240 mA max, solid state
switch closure to indicate either:
Reverse flow
Activates switch closure output when reverse flow is
detected.
Zero flow
Activates switch closure output when flow goes to 0 ft/s
or below low flow cutoff.
Empty pipe
Activates switch closure output when an empty pipe
condition is detected.
Transmitter faults
Activates switch closure output when a transmitter fault
is detected.
R
max
=
52.08 (V
ps
– 10.8)
V
ps
=
Power Supply Voltage (Volts)
R
max
=
Maximum Loop Resistance (Ohms)
1000
0
10.8
30
Operating
region
Power supply (Volts)
Load (Ohms)
750
500
250
Содержание Rosemount 8750W
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