Multivariable Flow Transmitter IMV30


The IMV30 Multivariable Transmitter is an intelligent two-wire transmitter that provides precise and reliable measurement of pressure, differential pressure, sensor and electronics temperatures, and process temperature (from an external RTD). It transmits a 4 to 20 mA or digital output signal, as applicable, using HART digital communication for remote configuration, calibration, and monitoring. When used with a primary flow element, it also calculates process density and flow rate, and provides transmission of all the measured and calculated values.
Using measured process pressure and temperature, the IMV30continuously calculates process fluid density. When used with any of a variety of differential pressure-producing primary flow devices, the transmitter calculates mass or standard volume flow rate. The transmitter provides full dynamic compensation for all variables affecting the flow rate calculation.


  • One transmitter for many applications:
    • Individual measurements on a 2-wire loop.
    • Multiple measurements digitally.
    • Assigns 4 to 20 mA to any measurement.
  • Complete configuration using a Model PCMV PC based configurator;
  • limited configuration with optional LCD indicator, or HART communicator.
  • Calculates mass, volume, or standard volume flow rate based on multiple measurements, using a primary flow element.
  • Standard 5-year warranty.
  • Convenient module change allows easy migration between communication protocols.
  • Designed for hazardous area installations; versions available to meet agency flameproof and zone requirements.
  • CE marked; complies with EMC, ATEX, and PED European Directives; and NAMUR NE 21 interference immunity requirement, and NAMUR 105 overrange and underrange annunciations.
  • One transmitter replaces three separate transmitters, saving initial purchase costs.

Key Benefits

  • Simple, elegant sensor packaging uses very few parts to achieve exceptionally high reliability
  • Liquid Crystal Display (LCD) digital indicator with on-board pushbutton configuration and calibration.
  • Rugged & Dependable: Field-proven silicon strain gauge technology and corrosion-resistant epoxy finish
  • Calculates mass, volume, or standard volume flow rate based on multiple measurements, using a primary flow element.
  • Long-term stability with drift less than + 0.05% of URL for 10 years.
  • Best in the industry - 5 year warranty
  • Reduced process penetrations save money and reduce chances of fugitive emissions.
  • Fewer transmitters, less wiring, and fewer shutoff valves reduce installation costs.
  • Greater reliability due to fewer devices and less wiring means less chance of losses from downtime or process upsets.
  • Flow rate values from the transmitter eliminate allocation of system resources for flow rate calculations, reducing system costs.
  • High functionality and high performance provide exceptional value.
  • Dual Seal certified by CSA to meet ANSI/ISA 12.27.01-2003 requirements.
  • Numerous options and accessories offered to expand the capabilities of these transmitters.


These transmitters are part of a complete family of gauge, absolute, d/p Cell®, multirange, multivariable, and premium performance transmitters, as well as transmitters with remote or direct mount pressure seals. They all use field-proven silicon strain gauge sensors and common topworks.


4 to 20 mA with HART communications allows direct analog connection to common receivers while still providing full digital communications using a HART Communicator, PC-based configurator, or optional LCD indicator.
For complete configuration capability, Foxboro Model PCMV PC-based configurator is required. A HART Communicator PC-based configurator, or optional LCD indicator can be used for routine transmitter functions such as rezeroing or changing damping settings. See Figure 15 for more information on Option  L1, LCD indicator.


Changes can be made to the IMV30 using a HART Communicator, PC-based configurator, or the optional local display. These configuration methods cannot configure the IMV30 for a specific application, but can only modify some parameter values after the initial configuration. Therefore Invensys recommends that IMV30 transmitters be factory configured at time of shipment if the application information is known. In order to supply the necessary information to the factory, an Option -C2 Configuration Wizard must be run and the results must be available to BuyAutomation. If the Factory Configuration Option (Option -C2) is not selected in the Model Code, the user must then have Model PCMV configuration software to fully configure the IMV30 transmitter for flow rate applications. The Device Descriptions and Device Type Manager files available from Invensys can modify some configuration parameters, but only the Model PCMV will calculate the necessary coefficients related to the process liquid and pass them to the transmitter.


  • Differential Pressure (DP)
  • Pressure (P)
  • Process Temperature (from external RTD)
  • Flow Rate (Mass, Volume, or Standard Volume)
  • Density
  • Sensor Temperature
  • Electronics Temperature


  • Accuracy to ±0.05% of Span
  • Long term stability with drift less than ±0.05% URL per year over a 5-year period
  • Minimized static pressure effect on DP by using pressure to compensate the DP measurement
  • Excellent Ambient Temperature Effect Compensation due to Characterization and Microprocessor-Based Compensation
  • Total Probable Error (TPE) significantly better than typical competitive transmitters


  • Can be used with primary flow devices such as orifice plates (see Figure 1), flow nozzles, Venturi tubes, and averaging pitot elements
  • Flow equations for liquids, gases, and vapors (also natural gas and steam) reside in the IMV30
  • With a separate RTD for Process Temperature Measurement, the IMV30 can calculate Mass Flow Rate, fully compensated for changes in absolute pressure and temperature
  • Selection of Volume and Standard Volume Flow Rate, in addition to Mass Flow Rate
  • Supports connection of a 2-, 3-, or 4-wire RTD, user-entered temperature, or calculation from saturation pressure (steam)
  • Eliminates the need for a separate computer to make the flow rate calculations
  • Flow rate transmission can be either in selectable EGU, such as kg/min (for the digital signal), or in Current (for the 4 to 20 mA analog signal), representing a specified flow rate range
  • Continuous dynamic compensation for all variables, including:
  • Changes in fluid density
  • Dimensional changes in primary device and adjacent piping with temperature
  • Changes in discharge coefficient based on Reynolds Number (corrected for velocity, density, and viscosity)


Windows-based software package to configure IMV30 Transmitter for flow rate applications
Determines a set of application-specific coefficients to be downloaded to transmitter for use in the transmitter’s flow rate equations
Provides configuration for:
Choice of primary flow device (i.e., orifice,nozzle, Venturi, averaging pitot)
Choice of pressure tap location (i.e., flange,corner, or D and D/2)
Process fluid, from a database of density-temperature relationships for over 275 fluids,or from user-entered density and temperature data
Operating pressure and temperature ranges
Industry flow rate standards, such as AGA,API, ISO, and ASME.
Easy-to-use configurator provides selections for for all user applications.


The 4 to 20 mA analog output can be assigned to any one of the following variable:
Differential Pressure
Absolute Pressure
Process Temperature
Sensor Temperature
Electronics Temperature
Flow Rate
Density (at actual pressure and temperature,and based on known fluid parameters)
Also, these variables can be read digitally usng the Model PCMV PC-based configurator or HART Communicator.
The digital output can be used for direct communication with an I/A Series System FBM:
With HART protocol, the above listed variables are digitally communicated to the system FBM with a 4 to 20 mA current.
All of the variables may be read digitally using the Model PCMV PC-based Configurator or HART Communicator.


Digital integration – all communications between applicable I/A Series System fieldbus module (FBM) and transmitter are digital
HART communications suitable for monitoring and control applications
Measurements are in EGU for ease of use
Continual monitoring of transmitter diagnostics
Measurements communicated from transmitter lower range to upper range limit, regardless of calibrated range. This provides more flexibility and information and eliminates the need to rerange transmitters when conditions change
Eliminates need for system analog input circuit, digital-to-analog conversion in the transmitter, and analog-to-digital conversion in the system, resulting in improved accuracy


Rotatable Topworks
Allows installation in tight places
Positions indicator in preferred direction
Eases field retrofit
Two conduit connections
Provide for easy wiring
Allow self-draining of condensation
Wiring guides and terminations
Provide easy entry and plenty of space
Use large, rugged screw terminals for easy wire termination


Removable, gasketed connectors allow a wide range of selections, including 1/4 NPT,1/2 NPT,Rc 1/4, Rc 1/2, and weld neck connectors.


A digital indicator (see Figure 15) with on-board pushbuttons is available to display the measurement with a choice of units.
Pushbuttons allow zero and span adjustments, as well as routine local configuration changes.


Biplanar Construction maintains the traditional horizontal process connections and vertical mounting by providing a cell body contained between two process covers, while still achieving light weight, small size, and high static pressure rating. This provides easy retrofit of any conventional differential pressure transmitter, and also is easily mounted in the horizontal position with vertical process connections, when required.
Process Covers are fully supported by the cell body over their entire height. This prevents bending and results in a highly reliable seal. Also, this provides dimensional stability to the process covers, ensuring that they will always mate properly with 3- valve bypass manifolds.
Process Cover Bolts are enclosed to minimize corrosion and to minimize early elongation with rapid temperature increases. The design makes it less likely for the transmitter to release process liquid during a fire.
Process Cover Gaskets are ptfe as standard; ptfe provides nearly universal corrosion resistance, and eliminates the need to select and stock various elastomers to assure process compatibility.
ATEX Flameproof Design allows transmitter to be installed in hazardous locations requiring ATEX Flameproof rating.
Light Weight provides ease of handling, installation and direct mounting without requiring costly pipe stands


The traditional structure utilizes the right angle design common to most differential pressure transmitters in use throughout the world. Process connections are oriented 90 degrees from the transmitter centerline.
This traditional structure makes it easy to retrofit any transmitters of similar design.
Sensor cavity venting and draining is provided for both vertical and horizontal transmitter installation,using innovative tangential connections to the sensor cavity. Optional side vents are offered for sensor cavity venting in the upright position An extensive variety of process-wetted materials are available for the process covers on this highly versatilea and widely used transmitter.

Output Signal and Configuration

4 to 20 mA with HART Communications. When configured for multidrop applications, the mA signal is fixed at 4 mA to provide power to the device.Configurable with a HART Communicator, ModelPCMV Configurator, or optional LCD indicator. Model PCMV required for flow rate applications.

Measured and Transmitted Outputs

Absolute Pressure (Configurable for Gauge Pressure)
Differential Pressure
Sensor Temperature
Electronics Temperature
Process Temperature (from External RTD)
Calculated (1) and Transmitted Outputs
Process Density - Flowing Conditions
Mass Flow Rate
Volume Flow Rate - Flowing Conditions
Volume Flow Rate at Base Conditions - e.g., Standard ft 3 /h (SCFH), or Normal m 3 /h (NCMH)

Supply Voltage

HART 4 to 20 mA output with a superimosed digital signal. Minimum supply voltage is 11.5 V dc

Adjustable Damping (DP and Pressure)

The transmitter response time is normally 1.0 s, or the electronically adjustable setting of 0.00 (none), 0.25,0.50, 1, 2, 4, 8, 16, or 32 seconds, whichever is greater, for a 90% recovery from 80% input step as defined in ANSI/ISA S51.1.

Zero and Span Adjustments

Zero and span adjustments can be initiated from the Model PCMV or the optional LCD indicator.

Suppressed Zero and Elevated Zero

Suppressed or elevated zero ranges are acceptable provided Span and Range Limits are not exceeded.

Zeroing for Nonzero-Based Ranges

Dual Function Zeroing from the LCD indicator pushbuttons allows differential pressure zeroing with either zero differential or LRV differential applied. This greatly simplifies position effect zeroing on many pressure and level applications. The PC-based configurator or HART Communicator provides zeroing at any user-entered value.

Write Protect Jumper

Can be positioned to lock out all configurators from making transmitter database changes. This makes transmitter suitable for safety shutdown system applications that require this feature.

Field Wiring Reversal

No transmitter damage.

Minimum Allowable Absolute Pressure vs.Transmitter Temperature.

With Silicone Fill Fluid
Full vacuum: up to 121 °C (250 °F)

Process Temperature Measurement and Limits

Measurement: DIN/IEC, 2-, 3-, or 4-wire, 100 ohm, Platinum RTD
Range Limits: -200 and +850°C (-328 and +1562°F)

Flow Cutoff and Low Differential Pressure (DP)

When configured for flow rate calculations, Flow Cutoff Value may be entered in flow units, and Noise Reduction may be set “OFF or “ON”, where:
OFF = Flow Rate calculated from square root of DP
ON = Flow Rate calculated from dual slope linear DP below 4% of maximum configured DP
When configured as a standard DP transmitter in square root mode, it may be set for cutoff-to-zero for DP < 1% of maximum DP, or Dual Slope Linear for DP < 4% of maximum DP.


HART available in analog or multidrop mode. Digital communication is provided in all modes based upon the FSK technique which alternately superimposes one of two different frequencies on the uninterrupted current carried by the two signal/power wires.


Configuration and Calibration Data, and Electronics Upgradeability

All factory characterization data, and user configuration and calibration data, are stored in the sensor. This means that the electronics module can be replaced or changed from one type to another.
A module may be replaced without the need for reconfiguration or recalibration. Although module replacement can affect accuracy up to 0.20% of span, this error can be removed by an mA trim without application of pressure.

Option -C2: Optional Custom Configuration

For the transmitter to be custom configured by the factory, the user must complete the Multivariable Configuration Wizard before entering the order, this being the recommended procedure. If Option -C2 is not selected, a standard default configuration will be provided. The user will then need to completely configure the transmitter using the Model PCMV.

Option -L1: Optional Liquid Crystal Display (LCD) Digital Indicator with On-Board Pushbuttons

Indicator provides: Two Lines; five numeric characters on top line (four when a minus sign is needed) and seven alphanumeric characters on bottom line.
Measurement Readout; value displayed on top line, and units label displayed on bottom line.
Configuration and Calibration Prompts. Pushbuttons provide for:
Configuration Functions (2),br /> Calibration Functions


Zero-Based Calibrations; Stainless Steel Sensor with Silicone Fluid; Under Reference Operating Conditions unless otherwise specified; URL = Upper Range Limit and Span = Calibrated Span

Accuracy - Differential Pressure (a) (b)

Span CodesAccuracy in % of Span
Spans ≥10% URL
Spans < 10% URL
B and C ±0.05 ±(0.005) (URL/Span)
L and A ±0.10 ±(0.010)(URL/Span)

(a) Accuracy stated includes the effects of linearity, hysteresis, and repeatability.
(b) Also add ±0.025% to the accuracy to determine the total analog output accuracy if the DP measurement is assigned to the 4 to 20 mA output signal.

Accuracy - Absolute Pressure (a) (b) (c)

Span CodesAccuracy in % of Span
Spans ≥10% URL
Spans <10% URL
D, E, H and F ±0.05 ±(0.005) (URL/Span)
Span CodesAccuracy in % of Span
Spans ≥5% URL
Spans <5% URL
A ±0.05 ±(0.0025)(URL/Span)

(a) Accuracy stated includes the effects of linearity, hysteresis, and repeatability.
(b) For gauge pressure accuracy, add anticipated variation from user-entered barometric pressure.
(c) Also add ±0.025% to the accuracy to determine the total analog output accuracy if the Absolute Pressure measurement is assigned to the 4 to 20 mA output signal.

Accuracy - Process Temperature

±0.28°C (0.5°F) within ±140°C (250°F) of the normal operating point.

Accuracy - Flow Measurement

±1.0% of flow rate when configured for typical head class meter applications.

Stability (Long Term Drift)

< ±0.05% of URL per year over a 5-year period.

Calibration Frequency

The calibration frequency is five years. The five years is derived using the values of allowable error (% span), TPE (% span), performance margin (% span), and stability (% span/month); where: Calibration Frequency = Performance Margin / Stability = Months

Power-up Time

Less than 5 seconds for output to reach first valid measurement.

Vibration Effect

±0.2% of URL per “g” for vibrations in the range of 5 to 500 Hz; with double amplitudes of 6.3 mm (0.25 in) in the range of 5 to 15 Hz, or accelerations of 3 “g” in the range of 15 to 500 Hz, whichever is smaller, for aluminum housings; and with double amplitudes of 6.3 mm (0.25 in) in the range of 5 to 9 Hz, or accelerations of 1 “g” in the range of 9 to 500 Hz, whichever is smaller, for 316 ss housings.

RFI Effect

The output error is less than 0.1% of span for radio frequencies in the range of 27 to 1000 MHz and field intensity of 30 V/m when the transmitter is properly installed with shielded conduit and grounding, and housing covers are in place. (Per IEC Std. 61000-4-3.)

Supply Voltage Effect

Output changes less than 0.005% of span for each 1 V change within the specified supply voltage requirements

Position Effect

Transmitter may be mounted in any position. Any zero effect caused by mounting position can be eliminated by rezeroing. There is no span effect.

Ambient Temperature Effect

Total effect for both absolute and differential pressure for a 28°C (50°F) change within Normal Operating Condition Limits is ±(0.03% URL + 0.06% Span); except the effect on differential pressure for DP Span Codes A and L is ±(0.18% URL + 0.025% Span). Also for AP Span Code H, the effect is ±(0.02% URL + 0.06% Span); and for AP Span Code F, the effect is ±(0.15% URL + 0.06% Span).

Electromagnetic Compatibility

Complies with NAMUR NE 21 Interference Immunity Requirement, and NAMUR 105 overrange and underrange annunciations Complies with electromagnetic compatibility requirements of European EMC Directive 89/336/EEC by conforming to following CENELEC and IEC Standards: EN 50081-2, EN 50082-2, IEC 61000-4-2 through 61000-4-6

Switching and Indirect Lightning Transients

The transmitter can withstand a transient surge up to 2000 V common mode or 1000 V normal mode without permanent damage. Output shift is < 1.0%. (Per ANSI/IEEE C62.41-1980 and IEC Std. 801 -5.)


Process Cover and Connector Material (Process Wetted)

316 ss or nickel alloy (equivalent to Hastelloy ® C (3) ), as specified

Process Cover Bolts and Nuts

ASTM A193, Grade B7 high strength alloy steel for bolts, and ASTM A194 Grade 2H high strength alloy steel for nuts are standard. Options include NACE Class B7M bolting, 17-4 ss bolting, and 316 ss bolting. For the NACE B7M bolting option.

Process Cover and Process Connection Gaskets

Glass filled ptfe (Chemloy)

Sensor Material (Process Wetted)

316 ss or nickel alloy (equivalent to Hastelloy ® C (3) ), as specified

Fill Fluids

Silicone Oil or Fluorinert

Environmental Protection

Transmitter is dusttight and weather proof per IEC IP66 and provides the environmental and corrosion resistant protection of NEMA Type 4X.

Electronics Module

Printed wiring assemblies are conformally coated for moisture and dust protection.

Electronics Housing and Housing Covers

Housing has two compartments to separate the electronics from the field connections. The housing and covers are made from low copper, die-cast aluminum alloy with an epoxy finish, or from 316 ss. Buna-N O-ring seals are used to seal the threaded housing covers, housing neck, and terminal block.

Electrical Connections.

Field and RTD sensor wires enter through 1/2 NPT, PG 13.5, or M20, threaded entrances, as specified, on either side of the electronics housing. Wires terminate under screw terminals and washers on terminal block in the field terminal compartment.

Mounting Position

The transmitter may be mounted in any orientation.

Approximate Mass

3.5 kg (7.8 lb) – without Process Connectors
4.2 kg (9.2 lb) – with Process Connectors
Add 1.1 kg (2.4 lb) – with 316 ss Housing
Add 0.2 kg (0.4 lb) – with LCD Indicator Option

Absolute pressure range
IAP10, IAP10S, IAP20,
Differential pressure range
IDP10, IDP15, IDP25, IDP31, IDP32, IDP50
Gauge pressure range
IGP10, IGP10S, IGP20, IGP25, IGP50, IGP60
Multi variable transmitter range
IMV25, IMV30, IMV31


If you require further information on this product or would like a quotation, please contact dp-flow on:

sales +44(0)1865 60 0245