Emerson Rosemount 8712 flow Meter Transmitter

Emerson Rosemount 8712 flow Meter Transmitter

Overview

The Rosemount 8712 flow meter transmitter, manufactured by Emerson under the Rosemount brand, is a wall‑mount magnetic flowmeter transmitter designed for precision flow measurement of conductive liquids across a wide range of industrial applications. The 8712EM variant delivers robust measurement confidence through advanced diagnostics and user‑friendly operation.

The Rosemount 8712 transmitter integrates seamlessly with all Rosemount magnetic flow sensors (8705, 8711, 8721, and 8707 series). Its universal transmitter capability allows the 8712EM to operate with AC‑ and DC‑powered sensors from other manufacturers as well. As a result, plant engineers can standardise on the 8712 transmitter across multiple flowmeter installations while maintaining consistent configuration and diagnostics access.

Accuracy & Performance Specifications

The Rosemount 8712EM flow meter transmitter achieves volumetric flow accuracy up to ±0.15% over a 13:1 flow turndown ratio, and ±0.25% over a 40:1 turndown ratio. For applications requiring enhanced precision, an optional ±0.15% high‑accuracy configuration is available for the 8712 transmitter when paired with compatible sensors.

Repeatability of the Rosemount 8712 transmitter is specified at ±0.1% of reading, ensuring consistent measurement over time. The 8712EM maintains this performance across a velocity range from 0.04 ft/s to 33 ft/s (0.01 m/s to 10 m/s), making the 8712 transmitter suitable for both low‑flow and high‑velocity process streams.

The 8712 transmitter’s obstructionless design incorporates no moving parts, eliminating wear‑related drift and reducing maintenance intervals. This construction makes the Rosemount 8712 ideal for metering conductive slurries, wastewater, chemicals, and pulp stock.

Technical Specifications

The 8712EM wall mount transmitter is designed for remote installation, protecting sensitive electronics from harsh process environments. Remote mounting also provides convenient access for configuration and service. For installations where vibration or ambient temperatures exceed specified limits, the 8712 transmitter can be installed in a control room up to 1,000 feet from the sensor using suitable cable.

Communication Protocols & Output Options

The Rosemount 8712 flow meter transmitter supports multiple communication protocols to meet diverse plant automation requirements. Standard on all 8712EM units is a 4‑20 mA analog output with HART 7 protocol. HART 7 enables 32‑character tag capability, reducing start‑up time and simplifying device identification across large instrument inventories.

For digital integration, the Rosemount 8712 transmitter offers Modbus RS‑485 as an option. Intrinsically safe HART outputs are also available for the 8712EM when installed in hazardous area applications.

Additional output configurations for the 8712 transmitter include pulse output for totalised flow, auxiliary output, multidrop communications, and Positive Zero Return (PZR). All of these options are user‑selectable and can be configured through the Local Operator Interface (LOI) or configuration software tools such as ProLink III or AMS Device Manager.

The standard application of the 8712 includes a 4–20 mA output and control of the sensor coils. The 8712 electronics board is equipped with three user‑selectable hardware switches that set the Failure Alarm Mode, Internal/External Analog Power, and Transmitter Security. When shipped from the factory, the Rosemount 8712 comes configured with these switches set to HIGH for Failure Alarm Mode, INTERNAL for Analog Power, and OFF for Transmitter Security.

Diagnostic Capabilities

The Rosemount 8712EM incorporates a comprehensive diagnostic suite that enables predictive maintenance and process optimisation. The following diagnostics are standard on the 8712 transmitter:

Smart Meter Verification on the 8712EM allows users to run manual or continuous verification tests, with results accessible through the LOI or configuration software. This capability provides documented proof of meter performance for regulatory compliance and quality assurance purposes without requiring process shutdown.

The 8712 transmitter’s selectable coil drive frequency options allow optimisation for high‑process‑noise applications. By adjusting the coil drive frequency, the Rosemount 8712 can maintain stable output even in electrically noisy environments typical of metals and mining operations or variable frequency drive installations.

Mounting & Installation Specifications

The Rosemount 8712EM is a wall‑mount transmitter designed for remote installation. Mounting options include pipe mounting on up to 2‑inch diameter pipe using the supplied mounting plate, or surface mounting against a flat wall or panel. The mounting plate attaches to the pipe with mounting hardware, then the 8712 attaches to the plate using mounting screws.

To ensure maximum transmitter life, avoid excessive heat and vibration during installation. Typical problem areas for the 8712 transmitter include high‑vibration lines with integrally mounted transmitters, warm‑climate installations in direct sunlight, and outdoor installations in cold climates. When these conditions cannot be avoided, the remote‑mount design of the Rosemount 8712 allows the transmitter to be located in a control room, protecting the electronics while providing easy access for configuration and service.

For sensor installation, the 8712 transmitter requires proper grounding separate from the process reference ground. Do not connect a Rosemount 8712 transmitter to a non‑Rosemount sensor when installed in an explosive atmosphere. Always follow national, local, and plant standards to properly earth ground the 8712 transmitter and sensor.

The signal wire and coil drive wire must be twisted shielded cable. Emerson recommends 20 AWG twisted shielded cable for the electrodes and 14 AWG for coil drive connections. The cable shield must be connected at both ends of the electrode circuit to ensure proper noise rejection and measurement integrity.

Ordering Information & Model Codes

The Rosemount 8712 transmitter is available in multiple model configurations to match specific application requirements. Common complete model codes include:

8712EM – Wall‑mount magnetic flow meter transmitter with standard diagnostics and universal sensor compatibility

8712D – Model includes patented diagnostics that change the way users apply and maintain magnetic flow meters

8712E – Standard E‑Series transmitter with optional high‑accuracy configuration

8712ES – Transmitter with HART communications, 0.25% standard accuracy, and 0.15% high‑accuracy option

M‑8712E – Transmitter version used in hygienic and sanitary applications paired with 8721 sensors

When ordering the Rosemount 8712 transmitter, specify the power supply type (AC or DC), communication protocol (HART or Modbus), enclosure rating, and any additional output options. Refer to Emerson Product Data Sheet 00813-0100-4664 for complete ordering code breakdown and configuration details.

For reference documentation, the Rosemount 8712 reference manual is available under document number 00809-0100-4664 (legacy) and 00809-0400-4445 (Modbus protocol version). Quick Start Guides and installation manuals are also available for the 8712EM wall mount transmitter.

The Rosemount 8712 transmitter is compatible with the following Rosemount sensors: 8705 flanged magnetic flow meter, 8711 wafer magnetic flow meter, 8721 hygienic magnetic flow meter, 8707 universal magnetic flow meter, and MS100 slurry magnetic flow meter. For slurry applications requiring maximum performance in high‑noise environments, pair the MS100 sensor with the 8782 slurry transmitter; for standard magnetic flow meter performance, the 8712EM remains the recommended choice.