The Rosemount 8712D Transmitter is the easiest to use local operator interface and works with any manufacturer's flowtubes. The intuitive 15 actuator keypad provides instant access to the most commonly used functions, and the 2 line by 20 character display provides clear indication. Together they provide fast, intuitive, and easy configuration.

The 8712D transmitters operate with all Rosemount magnetic flow meters and the D and U versions provide universal functionality allowing them to operate other manufacturer's flow tubes. The 8712H high signal transmitter provides unprecedented performance in high noise applications.

All flanged Rosemount flowtubes are fabricated from stainless and carbon steel and welded to provide a hermetic seal that protects against moisture and other contaminants. Sizes range from ½ inch (15 mm) to 36 inches (900 mm). The sealed housing ensures maximum flowtube reliability by protecting all internal components and wiring from the most hostile environments.

Flotwtube Compatibility
Rosemount 8712C is compatible with all Rosemount flowtubes: 8705, 8707, 8711, 8721, and 570TM. The 8712D/U is also compaitble with AC and DC powered flowtubes of other manufacturers. The 8712H is only compatible with 8707 High-Signal flowtube.

Flowtube Coil Resistance
Rosemount 8712C: 25 Ω maximum
Rosemuont 8712H: 12 Ω maximum
Rosemount 8712D/U: 350 Ω maximum

Flow Rate Range
Capable of processing signals from fluids that are traveling between 0.04 and 30 ft/s (0.01 to 10 m/s) for both forward and reverse flow in all flowtube sizes. Full scale continuously adjustable between -30 and 30 ft/s (-10 to 10 m/s).

Power Supply
8712D: 90-250 V ac ±10%, 50-60 Hz or 12-42 Vdc
8712H: 115 V ac ±10%, 50-60 Hz

Ambient Temperature Limits
Operating:
8712D: -20 to 140^oF (-29 to 60^oC) with local operator interface
           -40 to 165^oF (-40 to 74^oC) without local operator interface
8712H: -20 to 130^oF (-29 to 54^oC) with or without local operator interface

Storage
-22 to 176^oF (-40 to 80^oC)

Humidity Limits
0-100% RH at 120^oF (49^oC), decreases linearly to 10% RH at 130^oF (54^oC)

Enclosure Ratings
Enclosure Type 4X, IP65

Turn-on Time
8712H: 30 minutes to rated accuracy from power up, 5 seconds from power interruption
8712D: 5 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 tot he zero flow rate signal level. (8712D is adjustable between 0.01 and 1 ft/s).

Overrange Capability
Singal output will remain linear until 110% of upper range value. The signal output will remain constant above these values. Out of range message displayed on LOI and the HART Communicator.

Dampening
8712H: Adjustable between 0.2 and 256 seconds
8712D: Adjustable between 0.0 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.
8712D transmitters and other manufacturer's flowtubes can be calibrated at known process conditions or at the Rosemount NIST-Traceable Flow Facility. Trasmitters calibrated on site require a two-step procedure to match known flow rate.

Software Lockout
Security lockout jumper on the electronics board can be set to deactivate all LOI and HART-based communicator functions to protect configuration variables from unwanted or accidental change.

Electrical Connections
Three ¾-14 NPT connections provided on the base of the transmitter. Screw terminals provided for all of the connections. Power wiring connected tot eh transmitter only. Remote mounted transmitters require only a single conduit connection tot he flowtube. Integrally mounted transmitters are factory wired to the flowtube.

Transmitter Weight
Transmitter approximately 9 lb (4 kg). Add 1 lb (0.5 kg) for local operator interface.

NOTE
HART Communication requires a minimum loop resistance of 250 ohms.

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