Emerson Rosemount 8732 flow Meter Transmitter

Emerson Rosemount 8732 flow Meter Transmitter

1.0 Product Overview

The Emerson Rosemount 8732 flow meter transmitter stands as a cornerstone of the Rosemount 8700M magnetic flowmeter platform, engineered for precision volumetric flow measurement of conductive liquids across a vast spectrum of industrial process applications [21†L16-L19]. As a full-bore, two-wire magnetic flowmeter (magmeter), the Rosemount 8732 offers the performance and diagnostic capabilities traditionally found in four-wire systems within an efficient two-wire platform [21†L20-L22]. This design significantly reduces installation costs and complexity while delivering trusted measurement accuracy for industries ranging from water and wastewater treatment to chemical processing and power generation [21†L24-L26].

Operating on Faraday’s Law of Electromagnetic Induction, the Rosemount 8732 flow meter transmitter generates a magnetic field perpendicular to the direction of flow; as conductive liquid moves through this field, a voltage proportional to flow velocity is induced and detected by electrodes [21†L27-L35]. Critically, measurement remains unaffected by changes in the liquid‘s temperature, density, viscosity, or pressure, provided the process fluid maintains minimum conductivity [21†L37-L39].

2.0 Key Performance Specifications

2.1 Reference Accuracy

The Rosemount 8732 flow meter transmitter delivers exceptional measurement precision. Standard reference accuracy is ±0.25% of volumetric flow rate, with an optional high-accuracy configuration achieving ±0.15% of rate [10†L7-L8] [9†L19-L21]. When paired with a Rosemount 8705 flowtube, system accuracy maintains ±0.5% of rate across 1 to 30 ft/s (0.3 to 10 m/s) flow velocities, with accuracy of ±0.005 ft/s (0.0015 m/s) below 1.0 ft/s [12†L17-L19].

2.2 Flow Rate Range

The Rosemount 8732 transmitter processes signals from fluids traveling between 0.04 and 39 ft/s (0.01 to 12 m/s) for both forward and reverse flow across all sensor sizes [7†L16-L18]. Full-scale range is continuously adjustable between –39 and 39 ft/s (–12 to 12 m/s) [7†L18-L19].

2.3 Repeatability and Stability

Repeatability is rated at ±0.1% of reading, while long-term stability maintains ±0.1% of rate over six months [12†L23-L24]. Maximum response time to a step change in input is 0.2 seconds [12†L24].

2.4 Turndown Performance

When paired with Rosemount 8705 sensors, the 8732 flow meter transmitter achieves ±0.15% volumetric flow accuracy over 13:1 turndown ratios, and ±0.25% over 40:1 turndown [13†L5-L6].

3.0 Electrical and Power Specifications

3.1 Power Supply

The Rosemount 8732 flow meter transmitter accommodates both AC and DC power configurations:

AC Power: 90 – 250 VAC, 50/60 Hz

DC Power: 12 – 42 VDC [7†L21] [11†L28]

3.2 Power Consumption

DC operation: 15W maximum

AC operation: 40VA maximum [7†L25] [11†L32]

3.3 Line Power Fuses

For 90–250 VAC systems, use 1A, 250V fast-acting fuses (I²t rating 1.5 A²s) – Bussman AGC-1 or Littelfuse 31201.5HXP [7†L21-L23]. For 12–42 VDC systems, use 3A, 250V fast-acting fuses (I²t rating 14 A²s) – Bel Fuse 3AG 3-R, Littelfuse 312003P, or Schurter 0034.5135 [7†L23-L24].

3.4 Switch-On Current

AC: Maximum 35.7A (<5ms) at 250VAC

DC: Maximum 42A (<5ms) at 42VDC [7†L25-L26] [11†L32-L33]

3.5 Transmitter Coil Drive Current

The Rosemount 8732 flow meter transmitter delivers a coil drive current of 500mA, ensuring reliable signal excitation across all compatible sensor sizes [7†L15-L16] [11†L23].

4.0 Process and Environmental Requirements

4.1 Conductivity Limits

Process liquids must maintain minimum conductivity of 5 microSiemens/cm (5 micromhos/cm) or greater [7†L19-L20] [11†L26-L27].

4.2 Ambient Temperature Effect

±0.25% change over the operating temperature range [12†L25].

4.3 Enclosure Ratings

The Rosemount 8732 transmitter features Type 4X enclosure rating with IP66 compliance per IEC 60529, providing robust protection against moisture ingress and environmental contaminants [13†L19-L20].

4.4 EMC Compliance

Meets increased requirements of NAMUR Recommendations (May 1993, Part 1) for electromagnetic compatibility of process and laboratory apparatus [12†L26-L28].

4.5 Vibration Effect

Complies with IEC 770 pipeline installation conditions [12†L29].

5.0 Diagnostic Capabilities

The Rosemount 8732 flow meter transmitter integrates multiple advanced diagnostic suites that detect and warn of abnormal situations throughout the meter’s lifecycle – from installation through maintenance and verification [8†L31-L36]:

Smart Meter Verification: Continually monitor meter health and performance without process interruption

Ground and Wiring Fault Detection: Quickly verify installation integrity [7†L33] [13†L37-L38]

High Process Noise Diagnostic: Optimize control in noisy applications [7†L30-L31] [13†L35-L36]

Selectable Coil Drive Frequency: Superior noise rejection capabilities [7†L31] [13†L36]

Tunable Empty Pipe Detection: Minimize issues and false readings when the pipe is empty [7†L31-L32] [13†L36-L37]

Transmitter Fault Detection and Sensor Fault Detection [13†L14-L15]

Electrode Coating Detection [13†L15]

Diagnostics are accessible via Local Operator Interface (LOI), HART Field Communicator, and AMS™ Suite: Intelligent Device Manager [19†L16-L19].

6.0 Communications and Outputs

4-20mA with HART communications [10†L7]

Modbus RS-485 with pulse output options [8†L27]

FOUNDATION Fieldbus protocol support (Device Type ID: 8732) [9†L6-L7]

Intrinsically Safe (I.S.) output options [8†L15]

SMART™ Meter Verification for reliability and performance enhancement [8†L15-L16]

7.0 Sensor Compatibility

The Rosemount 8732 flow meter transmitter offers universal compatibility with all Rosemount-manufactured sensors, including Rosemount 8705 flanged sensors, Rosemount 8711 wafer sensors, Rosemount 8721 hygienic (sanitary) sensors, and Rosemount 8707 high-signal sensors [7†L14] [10†L19-L21] [13†L15-L16]. Additionally, the 8732 transmitter is compatible with AC and DC powered flowtube sensors from other manufacturers [10†L21-L22] [11†L22].

8.0 Installation and Mounting

8.1 Mounting Configurations

Available in both integral and remote mount configurations, providing flexibility for diverse installation requirements [8†L13-L14] [10†L8].

8.2 Piping Requirements

To ensure specification accuracy across varying process conditions, install the sensor with minimum five straight pipe diameters upstream and two straight pipe diameters downstream from the electrode plane [8†L47-L49].

8.3 Wiring Requirements

Signal wire and coil drive wire must utilize twisted shielded cable. Emerson recommends 20 AWG twisted shielded cable for electrodes and 14 AWG twisted shielded cable for coils. The cable shield must be connected at both ends of the electrode circuit [2†L23-L26] [2†L38-L41].

9.0 Local Operator Interface (LOI)

The Rosemount 8732 transmitter features a backlit 2-line by 16-character local operator interface with four optical switches, enabling adjustments in hazardous environments without removing the cover [10†L16-L18]. The LOI allows operators to view flow rates and totals, change transmitter configuration parameters, control totalizers, and execute diagnostic functions [17†L8-L10].

10.0 Hazardous Area Approvals

Factory Mutual (FM): Class I, Division 2, Groups A, B, C, D; Class II, Division 1, Groups E, F, G; Class III [12†L5-L6]

Canadian Standards Association (CSA): Class I Division 2, Groups A, B, C, D; Class II Division 1, Groups E, F, G; Class III [12†L7-L9]

FM Explosion-Proof (E5): Class I, Division 1, Groups C and D [12†L10]

KEMA/CENELEC (ED): EEx d IIB T6 [12†L11]

ATEX and IECEx approvals: Ordinary Locations, Non-Sparking, Dust Class I Div 2/Zone 2, Increased Safety, and Intrinsically Safe electrode options [11†L14-L17]

11.0 Physical Dimensions and Housing

Dual-compartment transmitter housing isolates electronics from moisture and contamination, utilizing continuous temperature compensation for immunity to environmental changes [9†L17-L18] [7†L11].

12.0 Troubleshooting Reference

The Rosemount 8732 performs self-diagnostics on the entire magnetic flowmeter system – transmitter, sensor, and interconnecting wiring [3†L32-L34]. Common diagnostic status codes include:

13.0 Ordering and Availability

The Emerson Rosemount 8732 flow meter transmitter is available through authorized distributors including Instrumart and Kempston Controls. Typical lead times range from 3–4 weeks to 18–19 days depending on configuration and stock availability [10†L6-L7] [6†L24-L25]. Pricing varies by configuration; base pricing for Rosemount 8732E configurations typically ranges from approximately $1,395 to $4,182 depending on options and diagnostic suites

14.0 Conclusion

The Emerson Rosemount 8732 flow meter transmitter delivers industry-leading measurement performance combined with comprehensive diagnostic capabilities, making it the preferred choice for demanding industrial flow measurement applications. Whether for water and wastewater treatment, chemical processing, power generation, or slurry applications, the Rosemount 8732 flow meter transmitter provides the accuracy, reliability, and process insight required for optimal control. Contact an authorized Emerson Rosemount distributor for configuration assistance, pricing, and availability.