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Multivariable Transmitter

Precision 3-in-1 measurement of Differential Pressure (DP), Static Pressure (SP), and Process Temperature — engineered for differential pressure flow elements in oil & gas, process, and water industries.

Applications: Natural gas, Liquid, Gas and Steam DP range: 25 to 10000 MMWC Accuracy" DP ±0.075% · SP ±0.05% · Temp ±0.5 °C Output signal: 4-20mA & RS-485 serial Power supply : 12 to 32 VDC

Description

The BMVT-1000 Multivariable Transmitter is an advanced 3-in-1 precision instrument designed for differential pressure flow measurement applications. It simultaneously measures Differential Pressure (DP), Static Pressure (SP), and Process Temperature through an external PT100 ohm RTD sensor (4-wire), providing all variables required for accurate, real-time compensated mass flow calculation — from a single device and a single process connection.

The BMVT-1000 integrates seamlessly with popular third-party flow computers via RS-485 serial output, making it exceptionally easy to commission into existing flow measurement and control systems. It is ideally suited for natural gas custody transfer, pipeline metering skids, wellhead measurement, and industrial process plant flow applications.


Single-Device 3-in-1 Architecture: A single transmitter replaces three separate field instruments (DP transmitter, static pressure transmitter, and temperature transmitter), reducing installed hardware cost, wiring effort, and ongoing maintenance requirements.
 

Advanced Sensor Capsule: Accurate filling fluid technology eliminates temperature and static pressure cross-effects on the DP cell. The dual-diaphragm design provides high overload pressure protection for both high and low pressure sides of the capsule.
 

Wetted Materials: Process-wetted diaphragms available in Hastelloy C or 316L Stainless Steel. Process connections in SS 316 with 1/4-18 NPT(F) for broad piping compatibility.
 

Transmitter Housing: Die-cast Type 4X Aluminium enclosure, explosion-proof as standard on all models.IP66 weatherproof rating. Two 1/2 NPT(F) cable entry ports.
 

LCD Display & User Interface: Backlit graphical LCD with 180° rotation for optimum field viewing. Internal status toggle button for field diagnostics. Housing body rotates 180° left or right for piping-orientation flexibility.
 

External Temperature Input: Accepts a PT100 (100 ohm) RTD sensor on a 4-wire connection for process temperature measurement. The RTD probe assembly (HW5000-RTD) is available as an accessory with 10 ft braided stainless steel cable.

Features

Simultaneous 3-in-1 measurement: Differential Pressure, Static Pressure, and Process Temperature
Seamless integration with popular third-party flow computers via RS-485 (3095 Communications Emulation)
High reference accuracy: DP ±0.075% F.S. / SP ±0.05% F.S. / Temp ±0.5°C
5-year long-term stability: ±0.2% URL
Accurate filling fluid technology eliminates temperature and SP cross-effects on DP cell
Dual diaphragm high overload pressure protection
Explosion-proof housing as standard on all models
Backlit LCD with 180° rotation and external push-button configuration
Housing rotation 180° left or right for installation flexibility
Wide pressure unit selection: PSI, kPa, MPa, BAR, mbar, mmH₂O, INH₂O, FTH₂O, and more
Temperature units: Celsius, Fahrenheit, Kelvin, Rankine
Configurable damping: 0 to 5 seconds
Wide power supply range: 12 to 32 Vdc
Diaphragm options: Hastelloy C or 316L Stainless Steel

Benefits

Reduces installed cost by replacing three separate transmitters with a single device
Eliminates additional wiring, junction boxes, and process tapping points
Accurate compensated flow calculation — all variables available at the flow computer from one instrument
5-year stability reduces calibration and maintenance frequency
Explosion-proof as standard — no additional hazardous area hardware required
Wide operating temperature range suits both onshore and offshore environments
Simple field configuration via LCD push-buttons without opening the housing
Seamless SCADA / DCS / flow computer integration via RS-485 Modbus-compatible protocol
Long service life with no moving parts in the flow stream
Low total cost of ownership over the instrument lifecycle

Mechanical Specifications

Measurement Variables Differential Pressure (DP), Static Absolute Pressure (SP), Process Temperature via external PT100 RTD (4-wire)
Meter / Instrument Type Multivariable Transmitter (Flanged / Direct-Mount)
Wetted Diaphragm Material Hastelloy C or 316L Stainless Steel (selectable)
Process Connection 1/4-18 NPT (F), 316 Stainless Steel
Enclosure Casing Material Type 4X Aluminium
Cable Entry Ports 2 × 1/2 NPT (F)
Ingress Protection IP66
Mounting Orientation Horizontal / Vertical — 2-inch pipe mounting kit available
Overload Protection Dual diaphragm high overload pressure protection

Transmitter Specifications

Display
Graphical OLED Display
Analog Output
4-20mA, 3 Wire source
Communication
RS-485 Serial
Power Supply
12 to 32 Vdc
Pressure Units Supported
PSI, psf, OSI, Pa, kPa, MPa, BAR, mbar, mmHg, INHg, mmH₂O, cmH₂O, mH₂O, INH₂O, FTH₂O, TORR, g/cm², kg/cm², ATM, mm, m
Temperature Units Supported
Celsius, Fahrenheit, Kelvin, Rankine
Explosion Protection
Explosion-proof — Standard on ALL models
Hazardous Location
Zone 1 and 2
Class & Division
Group IIC - T4
Ingress Protection Standard
IP66

Process Parameters

Measuring Medium
Gas, Liquid, Steam — for use with differential pressure flow elements (orifice plate, venturi, flow nozzle, cone, etc.)
DP Measurement Range
25 to 1000O mmwc
DP Reference Accuracy
±0.075% of Full Scale
SP Measurement Range (Abs.)
400 to 6,000 psia
SP Reference Accuracy
±0.05% of Full Scale
Temperature Input
External PT100 RTD (4-wire), -50 to +400°C (-58 to +752°F)
Temperature Accuracy
±0.5°C (±0.9°F)
Long-Term Stability
±0.2% URL / 5 years
Damping Time
0–5 seconds (user configurable); Capsule response ≤0.2 s
Operating Temperature
-40 to 60°C (-40 to 140°F) — LCD: -20 to 60°C (-4 to 140°F)
Storage Temperature
-40 to 110°C (-40 to 230°F)
Humidity
5 to 100% RH @ 40°C (104°F)
Media Temperature (Silicone Oil Filling)
-45 to 250°C (-49 to 482°F)
Compensation
Real-time static pressure and temperature cross-effect compensation

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