6-3
Specifications
Pulse Output Test
Transmitter may be commanded to supply a specified frequency
between 1 and 1000 Hz
Turn-on Time
30 minutes to rated accuracy from power up,
5 seconds from power interruption
Start-up Time
0.2 seconds from zero flow
Low Flow Cutoff
Adjustable between 0.04 and 1 ft/s (0.01 and 0.3 m/s); below selected
value, output is driven to the zero flow rate signal level
Overrange Capability
Signal output will remain linear until 110% of upper range value or 33
ft/s; signal output will remain constant above these values; out of range
message displayed on LOI and the HART Communicator
Damping
Adjustable between 0.2 and 256 seconds
Flowtube Compensation
Rosemount flowtubes are flow-calibrated and assigned a calibration
factor at the factory. The calibration factor is entered into the
transmitter, enabling interchangeability of flowtubes without
calculations or a compromise in accuracy.
Model 8712U transmitters and other manufacturer’s flowtubes can be
calibrated at known process conditions or at the Rosemount
NIST-Traceable Flow Facility. Transmitters calibrated on site require a
two-step procedure to match the known flow rate.
Hazardous Locations Certifications
N0 Factory Mutual (FM) Approval Non-incendive, non-flammable
fluid service for Class I, Division 2 Groups A, B, C, and D;
Dust-ignition proof for Class II/III, Division 1 Groups E, F, and G
hazardous locations. T5 temperature level
AND
Canadian Standards Association (CSA) Approval Suitable for use
in Class I, Division 2 Groups A, B, C, and D; Dust-ignition proof for
Class II/III, Division 1, Groups E, F, and G hazardous locations
N5 Factory Mutual (FM) Approval Non-incendive, flammable fluid
service for Class I, Division 2 Groups A, B, C, and D; Dust-ignition
proof for Class II/III, Division 1 Groups E, F, and G hazardous
locations. T5 temperature level
CE CE Marking
Performance
Specifications
(System specifications are given using the frequency output and with the
unit at referenced conditions.)
Accuracy
Model 8712C/U with Model 8705 Flowtube
System accuracy is ±0.5% of rate from 1 to 30 ft/s (0.3 to 10 m/s);
between 0.04 and 1.0 ft/s (0.01 and 0.3 m/s), the system has an
accuracy of ±0.005 ft/s; analog output has the same accuracy as
frequency output plus an additional 0.01% of span
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