Foxboro 84F/84W Intelligent Vortex Flow Meter

Product Overview

84F is a flange body with a diameter of 3/4-12 inches (DN15-DN300); 84W is the wafer body, with a diameter of 3/4-8 inches (DN15-DN200). DN250 and DN300 only have 84F flange type. Support 4-20 mA analog, HART digital multi station, pulse output; Optional local LCD button on-site configuration; Using DirectSense ™ Patent sensing technology (sensor lifetime warranty), no moving parts; Equipped with Active Tuning ™ Active tuning algorithm. Supporting free selection software FlowExpert Pro ™ (No registration required for web version), used for flowmeter selection, flow rate calculation, Reynolds number, pressure loss, physical property library, supports exporting and printing reports.

Core Features

Measurement medium: liquid, gas, saturated vapor; Overheated steam without insulation and liquids containing suspended solids are not recommended.

precision

Liquid: ± 0.5% of reading;

Gas/Steam: ± 1.0% of reading.

Active Tuning ™ Active tuning

Low flow Reynolds number compensation, with a minimum support of Re=5000;

Compensate for non ideal upstream pipeline conditions such as bent pipes and reducers, and achieve full accuracy with a minimum of 5 times the diameter of the straight pipe section;

Adaptive filtering and signal conditioning, anti vibration; Low flow cutoff and damping time can be set according to the working conditions.

DirectSense ™： Directly detecting vortex pressure pulses to eliminate mechanical linkage losses; Sensors can be replaced on-site without the need for recalibration; Anti pipeline vibration; The sensor comes with a lifetime warranty.

Output capability: HART bidirectional communication; Pulse output can be configured with raw pulses, proportional frequency pulses, and cumulative pulses.

Compliance: Meets the EU PED Pressure Equipment Directive CE、EMI/EN61326； Support multiple explosion-proof certifications.

Easy to start: no need for a single component calculation, no need for mechanical calibration; Factory configurable.

Optional remote electronic module: The transmitter head is separated from the measuring tube, with a maximum cable length of 50ft (15.2m), without losing small signals; Support bracket installation on walls or DN50 pipes.

Optional isolation valve: allows online disassembly and assembly of sensors without interrupting pipeline process flow.

84F has a unique dual measurement version: dual sensors+dual electronic module redundancy, where one fails and the other continues to measure, used for safety interlocking and critical circuit backup. 84W does not have this version.

Work and environmental conditions

1. Process temperature

Sensor filling type temperature range

Fluorolubricant filling -20~+90 ℃ (0-200 ℉)

Silicone filling liquid -20~+200 ℃ (0-400 ℉)

No filling (high temperature) 200~430 ℃ (400-800 ℉)

Shell environmental temperature: with display -20~+80 ℃; No display -40~+80 ℃; Partial certification can reach 85 ℃. Power supply DC: 15.5-42 Vdc; The highest intrinsic safety version is 30V.

Operating premise: The medium cannot flash or corrode; Sufficient back pressure is required; Provide the formula for calculating the minimum back pressure to prevent liquid vaporization.

2. Performance indicators

Accuracy varies with Reynolds number

Liquid: Re>30000: ± 0.5% reading; 20000‑30000：±1.0%； 5000‑20000：±2.0%

Gas and steam: Re>20000: ± 1.0% reading; 5000‑20000：±2.0%

To achieve the above accuracy, it is necessary to configure the input medium density and viscosity.

Various influencing factors

Power supply voltage: pulse output has no effect; Analog output<0.005% per volt; Digital output has no impact.

The process temperature will change the inner diameter of the measuring tube, affecting the K coefficient. The instrument can automatically adjust based on the input process temperature.

Anti vibration: can withstand 3g acceleration without damage or drift calibration.

Pressure loss: The maximum pressure loss is about 8psi (0.55bar), and the actual value is calculated using FlowExpert Pro.

K-factor: K-factor is the number of pulses per unit volume, calibrated with factory water, and traceable to NIST; Divided into reference K factor and operating condition K factor, percentage offset correction can be made.

3. Output function

Model suffix: – T: HART+4-20mA+pulse output;  ‑U：HART+4‑20mA， No pulse output.

4-20 mA analog output: 2-wire loop power supply; HART FSK is superimposed on the current signal; HART supports multi station mode, with a maximum of 15 transmitters per twisted pair.

Pulse output (two-wire transistor switch, external power supply 5-30Vdc)

Raw pulse: directly outputs vortex frequency without damping;

Rate pulse: 0-10/100/1000Hz, corresponding range;

Total Accumulated Pulse: Output one pulse for each flow through the set volume. Equipped with reverse polarity and short circuit protection.

Damping: 0-32 second exponential filtering; Only effective for analog and digital outputs, the original pulse is not dampened.

Response time (undamped): analog/digital 0.5s; rate/total pulse 0.25s; original pulse follows vortex frequency.

Communication: baud rate 1200; Maximum communication distance of 1800m; 5 traffic updates per second/cumulative; Supports HART handheld devices, PC configuration software, and local button LCD.

Security features: password protection, write protection jumper (ISA-584.01); Power on+continuous self diagnosis in the background; Offline self-test.

4. Electrical characteristics

The maximum loop current in analog mode is 22 mA; the typical current in digital multi station mode is 10 mA; and the maximum pulse current is 20 mA.

Circuit load: voltage load curve exists for 4-20mA output; Use a HART handheld device with a minimum load of 250 Ω; Low temperature (＜ -29 ℃) requires a minimum loop voltage of 15.75V to ensure communication.

Wiring terminal: 1/2NPT or M20 threaded interface on both sides of the shell; The casing is divided into two chambers, with the on-site wiring chamber isolated from the electronic chamber; The grounding terminal is externally independent.

Protection level: IP66, NEMA4X, die cast low copper aluminum alloy shell, epoxy coating.

5. Explosion proof certification

Supports ATEX, IECEx, FM, CSA, including intrinsic safety, explosion-proof, and non flammable; Support Zone/Class Div hazardous areas; An intrinsically safe 24V power supply requires a safety barrier.

Physical Structure and Materials

1. Liquid receiving components

84F flange type

≤DN100 (4in)：316SS； DN100: 304SS body, flange made of carbon steel or stainless steel.

84W clamp type

All caliber bodies are 316SS; optional Hastelloy C is available for DN15-DN100.

Gasket: Room temperature PTFE; High temperature 316SS/Hastelloy C+graphite composite gasket.

Isolation valve (optional): valve body CF8M, ball 316SS; normal temperature PTFE valve seat, high temperature graphite valve seat; Meet API607 fire protection requirements; Leakage level IV.

84F dual measuring body: CF8M stainless steel.

2. Installation points

The pipeline can be oriented in any direction (horizontal, vertical up/down);

Saturated steam: Priority horizontal pipeline, electronic meter head installed below the pipeline;

Overheated steam: must be insulated to prevent the electronic casing from overheating;

When installing liquid vertically downwards, it is necessary to ensure that the pipeline is full and there are no cavities.

The outer shell of the meter head can rotate in 90 ° steps, with a maximum of 270 °;

84W clamp type relies on centering gaskets to adapt to different flange grades;

Straight pipe section: ideal working condition: upstream ≥ 30 times the pipe diameter, downstream ≥ 5 times the pipe diameter; After opening the pipeline compensation, the shortest upstream diameter is 5 times the pipe diameter.

3. Weight and size

The document provides single measurement and double measurement; Outline drawings for intrinsic safety and remote installation;

84W maximum DN200; DN250/300 only has 84F flange;

The high-temperature version has a longer shell and requires additional compensation in size;

Isolation valves and dual measurement manifolds will increase weight; Provide ANSI/EN flange face to face dimension D table.

Model Code

Divided into two sets of codes: 84F (flange) and 84W (clamp), with coding sequence:

Model body;

Electronic version – T/- U;

Caliber code (3Q=DN15, 01=DN25, etc.);

Body/flange/vortex generator material;

Flange grade (ANSI150/300/600; PN16/40/63/100);

Single/double measurement, with or without isolation valve;

Sensor filling medium and temperature level;

Header installation: body installation/remote installation; Threaded interface 1/2NPT/M20;

Local display: No display N/with LCD J;

Electrical explosion-proof certification code;

Additional options: remote cable length, oxygen cleaning – H, gold-plated sensor – J, material certificate, NACE certificate – Q, calibration certificate – N, gland head, welding inspection certificate, user nameplate MTS, etc.

The remote header must select an additional cable length (- B-D-E-G).

Optional accessories and certificates

Remote cable: 6m/9m/12m/15m;

Oxygen/chlorine cleaning – H (some conditions are limited);

Gold plated sensor – J: Recommended hydrogen working condition;

Certificates: Compliance Certificate, Material 3.1 Certificate, NACE MR-01-07 Certificate, Calibration Certificate, Welding/Radiographic Testing Certificate;

Cable gland Hawke, PG11; Pipe joint;

Stainless steel user nameplate; Matching bolt kit for clamp flowmeter.

Request for Quotation/Order (RFQ)

Complete model code;

Process data: maximum/normal/minimum flow rate; Medium, viscosity, density; Process temperature and pressure; Pipeline wall thickness; Upstream pipe disturbance situation;

Simulate the full-scale flow rate corresponding to 20mA output;

Explosion proof rating;

All additional options;

User tag information.

Technical specifications

The document provides specification paragraphs that can be directly used for bidding: requiring HART protocol, 4-20mA+pulse, and local LCD/HART manual controller configuration; Liquid ± 0.5% reading, gas/vapor ± 1.0% reading; The sensor can be replaced without calibration; IP66/NEMA4X； Intrinsic safety/explosion-proof; Body material 316SS/Hastelloy C; supports body/remote installation; Built in traffic accumulation.