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IDP25 Intelligent Differential Pressure Transmitter

Intelligent Differential Pressure Transmitter IDP25

IDP10 3

Manufactured byfoxboro

The I/A Series® Model IDP25 is an intelligent, multirange, 2-wire differential pressure transmitter that provides precise, reliable, measurement of differential pressure providing the measurement range and performance of "two transmitters in one." It transmit a 4 to 20 mA or digital output signal, as applicable, using HART®, or FOUNDATION® Fieldbus communication protocol for remote configuration, calibration and monitoring.
Long-term stability with drift of 0.015% URL per year stability over a ten year period.

FEATURES

  • Silicon strain gauge sensors successfully fieldproven in many thousands of installations.
  • Digital precision, stability, and resolution ensure top measurement performance.
  • Multirange transmitters simplify planning, ordering, and spares procurement and stocking.
  • Wide measurement spans from 0.12 to 250 kPa (0.5 to 1000 inH2O) using only two sensors, each having 400:1 turndown capability.
  • Can be provided as a sealed measurement system with numerous configurations of direct connected or capillary connected seals available.
  • Simple, elegant sensor packaging with very few parts achieves exceptionally high reliability.
  • A selection of FoxCom, HART, or FOUNDATION Fieldbus Protocols for remote communication.
  • Local configuration available with the optional LCD Indicator with on-board pushbuttons.
  • Transmitter available with traditional or low profile transmitter structures (see photos above).
  • Hastelloy C or Industry Standard 316L ss offered for sensor wetted parts materials. Dual Seal Certified by CSA to meet ANSI/ISA 12.27.01-2003 requirements.
  • Multi-marking is available for HART electronic versions for FM, CSA, and ATEX intrinsically safe installations. The user determines and permanently marks on the data plate the certification to be applied.
  • Durable aluminum or 316 ss housing available; both meet NEMA 4X and IP66 ratings.
  • Optional mounting bracket sets allow pipe, surface, or manifold mounting of transmitter.
  • Complies with applicable EMC and PED European Union Directives; see inside pages.
  • FOUNDATION Fieldbus versions are FISCO and FNICO compliant.
  • Designed for hazardous area installations. Versions available to meet Agency flameproof and zone requirements.
  • Standard 5-year warranty; 17-year optional.

I/A Series PRESSURE TRANSMITTER FAMILY

The I/A Series Electronic Pressure Transmitters are a complete family of d/p Cell, gauge, absolute, multirange, multivariable, and premium performance transmitters, as well as transmitters with remote or direct connect seals, all using field-proven silicon strain gauge sensors and common topworks.

TRUE MULTIRANGE CAPABILITY

Excellent performance is maintained over a very wide turndown range. The transmitter provides not only the functionality of two transmitters in one, but also provides performance that could previously be attained only by selecting one of several different sensors.

MULTIRANGE FUNCTIONALITY

The turndown ratio for span adjustment is 400:1. This means that the IDP25 with its 50 kPa (200 inH2O) URL sensor can be set to provide a 4 to 20 mA output for any range between 0 to 0.12 and 0 to 50 kPa (0 to 5 and 0 to 200 inH 2O). Similarly, the IDP25 transmitter with its 250 kPa (1000 inH2O) URL sensor covers any range between 0 to 0.625 and 0 to 250 kPa (0 to 2.5 and 0 to 1000 inH2O). Therefore, this means that each sensor covers the ranges normally requiring two separate transmitters.

MULTIRANGE PERFORMANCE

Accuracy of ±0.050% of span is maintained for a span adjustment turndown range of 80:1, and does not exceed ±0.075% of span until a full 120:1 turndown is reached. Most competitive transmitters have an error greater than ±0.075% of span when turndowns exceed 10:1 to 20:1. The IDP25 is a true multirange transmitter because its performance is maintained over a very wide turndown range, meaning that it performs as well as, or better than, two separate transmitters designed to cover the same turndown range.

DIGITAL AND 4 to 20 mA OUTPUT VERSIONS

FoxCom, HART, and FOUNDATION Fieldbus communication protocols are described below.

Digital FoxCom or 4 to 20 mA dc (Configurable) (Version -D Electronics)
FoxCom Digital Output

Provides Measurement Integration with I/A Series systems, transmission of multiple measurements, and workstation configuration and diagnostics. Also provides digital communications with a PC-based Configurator or optional LCD Indicator with on-board pushbuttons for local configuration and calibration.

FoxCom 4 to 20 mA Output

Allows direct analog connection to common receivers while still providing full intelligent transmitter digital communications with a PC-based Configurator, applicable I/A Series system FBMs, or optional LCD Indicator with on-board pushbuttons for local configuration and calibration.

Digital HART and 4 to 20 mA dc
(Version -T Electronics)

4 to 20 mA with HART communications. Allows direct analog connection to common receivers while still providing full Intelligent Transmitter Digital Communications using a PC-based Configurator, HART Communicator, or optional LCD Indicator for local configuration and calibration.
Users having HART Communicators for other devices can have them upgraded with Foxboro software to accommodate these transmitters. Also, Foxboro will make use of the HART Foundation library of registered DDs (Device Descriptors), and reload the Communicator if the user desires to keep another supplier's DD along with the Foxboro DD.

Digital FOUNDATION Fieldbus (Version -F Electronics)

This all digital, serial, two-way communication system interconnects field devices, such as transmitters, actuators, and controllers. It is a Local Area Network (LAN) with built-in capability to distribute control application across the network. Fieldbus technology consists of a Physical Layer, a Communication Stack, and User Application Blocks. The Communication Stack includes a Link Access Scheduler and the Application Blocks include AI (Analog Input) and PID (proportional, integral, derivative) function blocks. Interoperability of fieldbus devices is achieved using device addresses (IDs) and device descriptors (DDs).

COMPLIANCE WITH EUROPEAN UNION DIRECTIVES

Complies with Electromagnetic Compatibility Requirements of European EMC Directive 2004/108/EC by conforming to the following EN and IEC Standards: EN 61326-1 and IEC 61000-4-2 through 61000-4-6.
Complies with NAMUR NE 21 Interference Immunity Requirement.
Analog output complies with NAMUR NE 43 overrange and underrange annunciations.
CE marked; complies with applicable EMC, ATEX, and PED European Union directives.

HAZARDOUS AREA INSTALLATIONS

See Electrical Safety Specifications section.

FISCO/FNICO COMPLIANT

FOUNDATION Fieldbus Version (Electronic Version -F) certified by ATEX and IECEx for FISCO field device intrinsically safe, and FNICO field device protection n installations. Also certified for intrinsically safe and nonsparking user entity parameters.

PROCESS CONNECTORS

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

SENSOR CORROSION PROTECTION

Choice of 316L ss or highly corrosion resistant Hastelloy C material. See TI 037-75b for process applicability with both 316L ss and Hastelloy C process wetted materials.

EASE OF INSTALLATION

Rotatable Topworks allows transmitter installation in tight places, allows indicator to be positioned in preferred direction, and eases field retrofit. Two Conduit Entrances offer a choice of entry positions for ease of installation and self-draining of condensation regardless of mounting position and topworks rotation. Wiring Guides and Terminations provide ease of wire entry and support, plenty of space to work and store excess wire, and large, rugged screw terminals for easy wire termination.

OPTIONAL LCD DIGITAL INDICATOR

A two-line digital indicator (Figure 17) with on-board pushbuttons is available to display the measurement with a choice of units. The pushbuttons allow zero and span adjustments, as well as local configuration without the need for a PC-based configurator.

OPTIONAL MOUNTING BRACKET SETS

In addition to the standard style mounting bracket sets optionally offered with these transmitters, a unique universal style mounting bracket has been developed to allow wide flexibility in transmitter mounting configurations consistent with installation requirements. All mounting bracket sets allow mounting to a surface, pipe, or manifold. Refer to Dimensions - Nominal section.

UNIQUE PROCESS COVER/CELL BODY DESIGN

Biplanar Construction (Figure 1) 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 standard static pressure rating of 25 MPa (3625 psi). 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 (Figure 1) 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 3valve bypass manifolds.
Process Cover Bolts (Figure 1) 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.
Light Weight provides ease of handling, installation, and direct mounting without costly pipe stands.

TRANSMITTER STRUCTURES

Traditional and low profile structures (LP1 and LP2) are offered to accommodate and to provide flexibility in transmitter installations.
Traditional Structure
The traditional structure (Figure 2) 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 (Figures 3 and 4). Optional side vents are offered for sensor cavity venting in the upright position (Figure 5).
An extensive variety of process-wetted materials are available for the process covers on this highly versatile and widely used transmitter. Refer to the pages that follow for descriptions of low profile structure LP1 and low profile structure LP2.
Low Profile Structures
The low profile structures utilize an in-line design, placing the process connections in line with the transmitter centerline (Figures 6 and 7). This allows mounting of the transmitter in the upright position with the process connections facing downward, for connection to vertical process piping or for mounting directly to a three- or five-valve manifold. The low profile structures provide a mounting style similar to that used by competitive Coplanar™ transmitters. This makes it easy to select Foxboro transmitters for both retrofit and new applications where this type of installation is desired. Transmitters with the low profile structure can be attached directly to existing, installed Coplanar manifolds, such as the Rosemount Model 305RC, or Anderson Greenwood Models MB3, MB5G, and MB5P, by use of an optional adapter plate (see Figure 8). Also, when assembled to the same process piping or manifold as a Coplanar transmitter, one of the electrical conduit connections is located within one inch (plus or minus) of the similar conduit connection on the competitive transmitter, assuring ease of retrofit or conformance with installation design drawings.
All parts making up the low profile versions are identical to the parts in the traditional version except for the process covers and the external shape of the sensor cell body.
For user convenience, two types of low profile structures are offered, type LP1 and LP2. The process covers are the only transmitter parts that differ between structure types LP1 and LP2.
Refer to the sections that follow for further descriptions of low profile structures LP1 and LP2.
Low Profile Structure LP1 – Direct Mount
Low Profile Structure LP1 is a compact, inexpensive, lightweight design for direct mounting to a separately mounted manifold or process piping. These transmitters are not typically bracket-mounted. They are supplied as standard with a single vent/drain screw in the side of each process cover. In conjunction with the standard tangential venting and draining design, they are suitable for mounting either vertically (Figure 9) or horizontally, and are suitable for nearly all applications, including liquids, gases, and steam. For horizontal installation, they can simply be “turned over” (rotated 180 degrees - Figures 10 and 11) to orient the high and low pressure sides in the preferred locations. There is no need to unbolt process covers. The topworks housing can also be rotated, as shown, to orient the conduit connections in the desired position.
In the vertical, upright position, they are also selfdraining and are ideal for gas flow rate service, when directly mounted to a manifold located above the horizontal pipeline.
The vent screw can be omitted for this or other applications, if desired.
Low Profile Structure LP2 - Bracket or Direct Mount
Structure LP2 is a universal design for either bracket or direct mounting. Drilled and tapped mounting holes facilitate mounting to either new or existing Foxboro brackets (Options -M1, -M2, and -M3), as well as standard brackets supplied with existing Coplanar transmitters. See Figures 12 and 13.
These transmitters can also be directly mounted to manifolds or process piping and are available with the same optional adapter used with low profile structure LP1 to fit existing Coplanar manifolds (Figure 14).
For extra convenience, they use a full-featured vent and drain design, with separate vent and drain screws positioned in each cover for complete venting or draining directly from the sensor cavity. They are normally recommended for upright, vertical installation.

Suppressed Zero and Elevated Zero

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

Zero and Span Adjustments

Zero and span adjustments can be initiated from any of the following: I/A Series Workstation (with applicable FBMs), HART Communicator, a PC-based configurator, or the optional LCD Indicator with on- board pushbuttons.

Zeroing for Nonzero-Based Ranges

Dual Function Zeroing is provided to allow zeroing with the transmitter open to atmosphere, even when there is a nonzero-based range. This greatly simplifies position effect zeroing on many pressure and level applications. It applies to optional LCD Indicator Pushbuttons and optional External Zero Adjustment.

Adjustable Damping

The transmitter response time is normally 0.75 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 an 80% input step as defined in ANSI/ISA S51.1 (for 63.2% recovery, 0.60 s). With FOUNDATION Fieldbus, additional damping is available because damping can be set on both the Transducer and AI blocks.

Electronics and Sensor Temperatures

Readable from I/A Series System, HART Communicator, Fieldbus Host System, or PC-based Configurator. Measurement is transmitter temperature at the sensor and the electronics module, not necessarily process temperature.

Field Wiring Reversal

No transmitter damage.

Supply Voltage

DIGITAL OUTPUT
– Version -D Electronics (FoxCom)
Power supplied through I/A Series System
– Version -T Electronics (HART)
Bidirectional digital signal superimposed on the 4 to 20 mA current signal.
– Version -F Electronics (FOUNDATION Fieldbus)
Power supplied through a specific Fieldbus power supply connected to the bus.
4 to 20 mA (FoxCom/-D AND HART/-T)
Minimum voltage shown in Figure 16 is 11.5 Vdc. This can be reduced to 11 V dc by using a plug-in jumper on the terminal block.

Square Root Low Flow Cutoff

User configurable to provide:
Cutoff to Zero at Flows < 10% of Maximum Flow (1% of Maximum Differential Pressure).
Or Active Point-to-Point Line between Zero and 20% of Maximum Flow (4% of Maximum Differential Pressure).
Flow Cutoff in Engineering Units (Fieldbus Only)
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.

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.
Changing module types may require reconfiguration and recalibration, as well as a different terminal block, if applicable, but all factory characterization data is retained.

Configuration Capability (See Note below)

CALIBRATED RANGE
– Input range within Span and Range Limits.
– Pressure EGU. See Table 2.
OUTPUT MEASUREMENT #1 —
DIGITAL PRIMARY VARIABLE;
AND 4 to 20 mA (FOXCOM AND HART ONLY)
–Mode
Linear or Square Root
– Units for Linear Mode, Same as calibrated range; or a Custom EGU (FoxCom only)
– Units for Square Root Mode % of flow; or a Custom EGU (FoxCom only)
OUTPUT MEASUREMENT #2 —
DIGITAL SECONDARY VARIABLE
–Mode
Linear or Square Root (Independent of Measurement #1)
– Units for Linear Mode A common pressure EGU, or a custom EGU (FoxCom only)
– Units for Square Root Mode % of flow; or a Custom EGU (FoxCom only)
– Measurements #1 and #2 These measurements may be swapped.
NOTE
Numerous parameters can be configured and/or displayed, such as electronic damping, failsafe direction, transmitter location, calibration, tag data, etc. See configuration documents for details.

FoxCom (Version -D) Communications

DIGITAL MODE (FIXED CURRENT)
Digital output signal is updated 10 times per second and carries the pressure measurement, and sensor and electronics temperature measurements. See Table 4 for communication parameters.
4 to 20 mA ANALOG MODE
Analog output is updated a minimum of 30 times per second. A minimum loop load of 250 ohms is required. See Table 4 for communication parameters.
HART (Version -T) Communications
4 to 20 mA ANALOG MODE
Analog output signal is updated 30 times per second. A minimum loop load of 250 ohms is required. See Table 4 for communication parameters.
MULTIDROP MODE (FIXED CURRENT)
This Mode supports communications with up to 15 transmitters on a single pair of signal/power wires. The output signal is updated 4 times/second. A minimum loop load of 250 ohms is required. See Table 4 for communication parameters and Figure 22 for a typical multidrop block diagram.

FOUNDATION Fieldbus (Version -F) Digital Communications

This serial, two-way communication system runs at 31.25 kbits/s. The digital output signal is superimposed on the dc power signal on the bus, and controlled by a strict cycle schedule and protocol. Supply voltage, 9 to 32 V dc, is by a specific Fieldbus power source. Current consumption is 19.5 mA. The maximum number of devices on a non-intrinsically safe bus is 32. For intrinsically safe bus systems, the maximum number is 5. Optional Custom Configuration (Option -C2) For the transmitter to be custom configured by the factory, the user must fill out a data form. If this option is not selected, a standard default configuration will be provided. See Table 3.

Optional LCD Digital Indicator (Figure 17)

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 on top line and units label on bottom line.
Configuration and Calibration Prompts.
Two Pushbuttons Provide for:
Configuration Functions
Calibration Functions
Optional External Zero Adjustment
An external pushbutton mechanism is isolated from the electronics compartment and magnetically activates an internal reed switch through the housing. This eliminates a potential leak path for moisture or contaminants to get into the electronics compartment. This external zero adjustment can be disabled by a configuration selection.

 

 

 

 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

 

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Supplied by DP-Flow