Emerson Rosemount 1195 Integral Orifice

Emerson Rosemount 1195 Integral Orifice

Introduction

In small-bore industrial pipelines—where space is limited, installation costs must be controlled, and measurement accuracy cannot be compromised—traditional orifice plate installations often introduce significant challenges. Conventional orifice runs require extensive straight pipe lengths, multiple process penetrations, and careful field alignment to avoid installation errors. The Emerson Rosemount 1195 Integral Orifice Primary Element eliminates these challenges through a compact, factory-integrated design that combines the orifice plate, meter run, and transmitter mounting into a single engineered assembly.

The 1195 is a differential pressure flow primary element designed specifically for volumetric flow measurement of clean gases, liquids, and steam in small line sizes from 0.5 to 1.5 inches (15 to 40 mm). Unlike field-assembled orifice installations that rely on site-based fabrication, the 1195 Integral Orifice arrives as a pre-engineered meter run with a self-centering orifice plate, precision-honed pipe section, and integral thermowell option—all housed in a compact assembly that mounts directly to any Rosemount differential pressure transmitter-6.

This technical datasheet provides comprehensive specifications, performance data, and application guidance for engineering professionals requiring high-accuracy flow measurement in small-bore process lines across chemical processing, oil and gas, power generation, pharmaceutical, and general industrial applications.

What Is the Rosemount 1195 Integral Orifice Primary Element?

The Rosemount 1195 is a complete primary flow element assembly that integrates the orifice plate directly into a meter run, eliminating the need for field fabrication or custom piping modifications. The design incorporates a self-centering orifice plate that is precision-aligned within a honed pipe section, ensuring that the orifice bore remains perfectly concentric with the pipeline regardless of field installation conditions-2. The 1195 Integral Orifice is available in 0.5-inch (15 mm), 1-inch (25 mm), and 1.5-inch (40 mm) line sizes, with a range of orifice beta ratios to match specific flow rate requirements.

The 1195 assembly can be ordered in two primary configurations:

As a standalone primary element for field integration with existing Rosemount DP transmitters

As a completely assembled flowmeter pre-assembled with a Rosemount pressure transmitter, such as the 3051SFC, 3051SFP, 3095MFP, or 4088 MultiVariable transmitter, factory-calibrated and pressure-tested prior to shipment-2

The Rosemount 1195 produces the most accurate and repeatable measurement when used in single-phase flow or steam flow above the saturation temperature-6. When paired with the Rosemount 4088 MultiVariable Transmitter, the system provides differential pressure, static pressure, and temperature measurement through a single integrated assembly, enabling fully compensated mass flow measurement-8.

Key Technical Specifications

General Specifications

The 1195 Integral Orifice is available in multiple material configurations with all wetted parts manufactured from 316 stainless steel as standard, with optional materials available for specialized applications. The meter utilizes precision-honed pipe sections and tight machining tolerances to ensure higher installed performance while eliminating installation errors that are magnified in small lines-6.

Available Line Size Configurations

The Rosemount 1195 Integral Orifice Primary Element is available in the following standard line size configurations:

The 1195S010 (1-inch) and 1195S015 (1.5-inch) configurations are the most commonly specified for general industrial flow measurement applications.

Temperature Limits by Mounting Configuration

The maximum operating temperature of the 1195 Integral Orifice depends on the transmitter mounting configuration selected:

For applications exceeding 450°F, the remote mount configuration using capillary tubing or impulse piping is required to isolate the transmitter from process heat. The high-temperature remote mount option enables service up to 850°F, suitable for superheated steam and high-temperature gas applications-6.

Pressure Rating Details

The 1195 primary element is rated to ANSI B16.5 Class 900#. This pressure class corresponds to the following maximum allowable working pressures at ambient temperature:

Class 900# flange rating at 100°F: 2,220 psig (153 bar)

Derated pressures apply at elevated temperatures per ASME B16.5 flange rating tables

For applications requiring higher pressure ratings beyond Class 900#, consult Emerson for special-order configurations.

Zero Error Performance

Zero error can be calibrated out at line pressure during initial setup-.

Key Features and Design Advantages

Self-Centering Orifice Plate Eliminates Installation Error

The defining characteristic of the Rosemount 1195 Integral Orifice is its self-centering orifice plate design. Unlike conventional orifice plates that rely on field alignment between flange gaskets, the 1195 features a captive orifice plate that is precisely centered within the meter run during factory assembly. This self-centering mechanism prevents the installation errors that commonly plague small-bore orifice installations—where even a slight misalignment can produce significant flow measurement inaccuracies-2.

Factory-Integrated Meter Run

The 1195 Integral Orifice is supplied as a complete meter run with the orifice plate factory-installed within a precision-honed pipe section. This integrated design eliminates the need for field fabrication of orifice fitting assemblies, reducing installation time and ensuring consistent performance across all installations. The meter run is available with a range of process connections, including threaded, socket weld, and flanged end connections, to match existing piping configurations.

Integral Thermowell for Fully Compensated Mass Flow

The 1195 primary element is available with an integral thermowell option, enabling process temperature measurement without requiring an additional pipe penetration. When combined with the Rosemount 4088 MultiVariable Transmitter, the system provides differential pressure, static pressure, and temperature measurement through a single integrated assembly. This configuration delivers fully compensated mass flow measurement with enhanced accuracy of ±0.05% of reading for the flow calculation-8.

Precision Machining for Small Line Accuracy

In small line sizes, even minor dimensional variations can produce significant flow measurement errors. The 1195 addresses this through precision-honed pipe sections and tight machining tolerances that ensure higher installed performance compared to field-fabricated orifice installations. The meter is available with a wide range of orifice bore diameters to suit nearly any flow rate requirement-6.

Compact Installation Footprint

The 1195 Integral Orifice assembly requires significantly less space than conventional orifice meter runs, which typically require 18 pipe diameters upstream and 8 diameters downstream when supplied with process pipe-end connections. The compact, integrated design allows installation in tight piping configurations where traditional orifice runs cannot be accommodated.

Direct Transmitter Mounting

The 1195 mounts directly to any Rosemount differential pressure transmitter using standard mounting hardware, eliminating the need for impulse piping in direct mount applications. The assembly is available to order pre-assembled with a transmitter for a complete flow assembly, simplifying procurement and ensuring factory alignment of the complete flow measurement system-2.

Model Code Breakdown: 1195S010T1S0500CS4

Rosemount model codes follow a structured engineering language where each character or group of characters defines a specific product configuration option. The complete model code 1195S010T1S0500CS4 can be broken down into the following logical segments:

Breakdown Explanation:

The 1195S010T1S0500CS4 configuration begins with the 1195 base model, followed by S designating 316 stainless steel as the process wetted material for all components in contact with the process fluid-2. The 010 indicates a 1.0-inch (25 mm) nominal line size, representing the smallest commonly used size for process flow measurement-2.

The T1 segment specifies the orifice plate type and beta ratio. The T denotes a standard orifice plate design (as opposed to a conditioning orifice or special geometry), while the 1 refers to a specific beta ratio (β) value as defined in the Emerson Instrument Toolkit sizing program. Beta ratio (β) is defined as the ratio of orifice bore diameter to pipe internal diameter—a smaller beta ratio produces a higher differential pressure signal for a given flow rate but also generates greater permanent pressure loss.

The S in the fifth position indicates the process connection type, typically threaded or socket weld connections suitable for small-bore piping.

The 0500 segment specifies the actual orifice bore diameter in thousandths of an inch—0.500 inches (12.7 mm). This bore size is custom-sized to the application flow rate requirements using Emerson’s Instrument Toolkit calculation software.

The CS4 segment represents special options, most commonly a factory calibration option. When this code is present, the 1195S010T1S0500CS4 assembly has been laboratory flow-calibrated for improved accuracy, with the calibration data recorded on a data sheet attached to the unit-.

For complete interpretation of any Rosemount model code, always reference the official Emerson Configuration Data Sheet for that specific order, as the exact code positions and meanings may vary by product revision and special configuration.

Transmitter Integration Options

The 1195 Integral Orifice can be factory-integrated with several Rosemount transmitter platforms to create complete flowmeter assemblies:

The 4088 MultiVariable configuration is particularly suited for oil and gas production applications where large fluctuations in flow rate commonly occur. The optimized sensor technology captures these variations while maintaining measurement integrity. The transmitter features an LCD display for local data viewing, Callendar-Van Dusen sensor matching for improved temperature accuracy, and reverse wiring protection to guard against installation errors-8.

Installation Guidelines

Orientation and Location

Install the Rosemount 1195 Integral Orifice in the correct location within the piping branch to prevent inaccurate measurement caused by flow disturbances. The 1195 is supplied with associated pipe lengths (18 diameters upstream and 8 diameters downstream) when ordered with process pipe-end connections-.

Stud and Nut Torque

Studs and nuts should be tightened to specification in two to three steps following a cross pattern. Never reuse gaskets—always replace gaskets after disassembly to ensure proper seal-.

Transmitter Mounting

For direct mount configurations, the transmitter mounts directly to the 1195 assembly using standard mounting hardware. For remote mount configurations requiring high-temperature operation above 450°F, sufficient impulse piping should be used to dissipate process heat and protect the transmitter.

Pre-Commissioning Verification

Prior to commissioning, verify that:

The flow arrow on the 1195 assembly aligns with process flow direction

All gaskets are properly seated and bolts torqued to specification

The transmitter configuration matches the 1195 orifice bore and beta ratio as specified on the calibration data sheet

Impulse lines (if used) are properly sloped for condensate drainage

Applications

The Emerson Rosemount 1195 Integral Orifice Primary Element is suitable for flow measurement across a wide range of industries and applications where clean fluids in small line sizes must be measured with high accuracy:

The 1195 is ideal for applications where:

Line sizes are 0.5 to 1.5 inches in diameter

The fluid is clean and single-phase (liquid, gas, or steam above saturation temperature)

High accuracy (±0.75%) is required in a compact footprint

Factory-engineered assembly reduces field installation errors

Frequently Asked Questions

Q: What line sizes are available for the Rosemount 1195 Integral Orifice?

A: The Rosemount 1195 is available in 0.5-inch (15 mm), 1.0-inch (25 mm), and 1.5-inch (40 mm) line sizes, designated as 1195S005, 1195S010, and 1195S015 in ordering configurations.

Q: What is the accuracy of the Rosemount 1195?

A: The 1195 Integral Orifice delivers accuracy up to ±0.75% of flow rate when properly installed and operated within specified conditions-6.

Q: What is the maximum temperature for the 1195 sensor?

A: The maximum temperature depends on mounting configuration: 450°F (232°C) for direct mount applications, and up to 850°F (454°C) for remote mount configurations with the high-temperature option selected-6.

Q: Can the Rosemount 1195 be used with dirty or sticky fluids?

A: No. The 1195 is designed for clean, single-phase fluids only—clean gases, clean liquids, and steam above saturation temperature. For dirty or erosive fluids, consider Annubar averaging pitot tube technology.

Q: What transmitters are compatible with the 1195 primary element?

A: The 1195 directly mounts to any Rosemount differential pressure transmitter. Factory-assembled configurations include the Rosemount 3051SFC, 3051SFP, 3095MFP, and 4088 MultiVariable transmitter platforms-8.

Q: Does the Rosemount 1195 require conductive fluids?

A: No. Unlike magnetic flow meters such as the Rosemount 8711 and 8721 series, the 1195 Integral Orifice can measure any clean fluid—conductive or non-conductive.

Q: How does the Rosemount 1195 differ from standard orifice plates?

A: The 1195 is a complete factory-assembled meter run with a self-centering orifice plate, precision-honed pipe section, and integral thermowell option. Standard orifice plates require field fabrication, alignment, and separate meter run construction, introducing potential installation errors.

Q: What is the recommended calibration interval?

A: Under normal operating conditions with clean fluids, calibration intervals of up to 5 years are achievable. For critical applications, annual verification is recommended.

Q: Is the Rosemount 1195 available with NACE compliance?

A: Yes. The 1195 is available with NACE MR-0175 / ISO 15156 compliance for sour service applications in the oil and gas industry-6.

Q: What is the pressure rating of the Rosemount 1195?

A: The 1195 Integral Orifice is rated to ANSI B16.5 Class 900#, with a maximum working pressure of 2,220 psig at 100°F-2.