Deltatop DP61D

Summary

Deltatop DP61D, DP62D, DP63D: Differential Pressure Flow Measurement System

This document describes the Deltatop DP61D, DP62D, and DP63D, a universal measuring system for steam, gases, and liquids utilizing Pitot tubes and Deltabar differential pressure transmitters.

Application

The Deltatop system is designed for flow measurement of gases, steam, and liquids with:

• Nominal diameters from DN 40 to DN 12000
• Medium temperatures from -200 °C (-328 °F) to 1000 °C (1830 °F)
• Pressures up to 420 bar (6300 psi)
• Compliant to DGRL 97/23/EC
• NACE compliant materials
• Approvals for hazardous areas: ATEX, FM, CSA
• SIL considerations
• Connection to common process control systems: Profibus, HART, Foundation Fieldbus

Key Features and Benefits

• Configurable Versions: Available in compact (minimizes installation costs) and modular remote (for demanding process conditions) versions.
• Optimized Design: Engineered for minimum pressure loss and high accuracy.
• Pre-adjusted Transmitter: Deltabar differential pressure transmitter comes pre-adjusted.
• Flexible Display: Configurable for flow rate, differential pressure, or 0...100%.
• Bidirectional Measurement: Suitable for bidirectional flow measurement.
• Robust Construction: Features no moving parts.

Measuring Principle

The system measures the differential pressure (Δp) created by a Pitot tube. The Pitot tube's front measures static pressure plus dynamic pressure, while the back measures only static pressure. This Δp is proportional to the square of the flow rate (Q). The permanent pressure loss introduced by the Pitot tube is minimal compared to other primary flow elements.

Flow Calculation

The system supports calculations for:

• Volumetric flow for gases under standard conditions
• Volumetric flow for gases under operating conditions
• Mass flow for gases and steam
• Mass flow for liquids
• Volumetric flow for liquids

The relationship between flow rate (Q) and differential pressure (Δp) is described by the equation: $Q = k \cdot A \cdot \sqrt{\frac{\Delta p}{\rho}}$

Where:

• $Q$ is the flow rate
• $k$ is the k-factor of the Pitot tube
• $A$ is the cross-sectional area of the pipe
• $\Delta p$ is the differential pressure
• $\rho$ is the medium density

The isentropic exponent ($\kappa$) is provided for gases: 1.66 for monatomic, 1.4 for diatomic, and 1.3 for triatomic gases.

Sizing and Optimization

• k-factor: Determined and verified through calibration for each Pitot tube, provided with the device.
• Sizing Tool: Endress+Hauser's "Applicator" software is available for selection and sizing, calculating differential pressure, pressure loss, measuring uncertainty, k-factor, required upstream/downstream lengths, and other parameters.
• Sizing Sheet: A "Sizing Sheet - Data Sheet" must be completed and attached to the order to ensure optimal configuration.

Temperature and Pressure Compensation

For accurate flow calculations, especially with gases and steam, temperature and pressure compensation may be required. This can be performed by:

• Endress+Hauser Energy Manager RMS621 or Flow and Energy Manager RMC621.
• A PLC, requiring user programming.

Additional probes for absolute pressure (mounted upstream of the Pitot tube) and temperature (mounted downstream, minimum 3D distance) may be necessary. Deltatop DP62D and DP63D models offer an integrated Pt100 temperature probe.

The compensation calculation utilizes the following formulas:

For mass flow (or volume flow at standard conditions): $Q_{m} = Q_{m1} \cdot \sqrt{\frac{\rho_1}{\rho_2}} = Q_{m1} \cdot \sqrt{\frac{P_1 T_1 Z_1}{P_2 T_2 Z_2}}$

For volume flow: $Q_{v} = Q_{v1} \cdot \sqrt{\frac{\rho_1}{\rho_2}} = Q_{v1} \cdot \sqrt{\frac{P_1 T_1 Z_1}{P_2 T_2 Z_2}}$

Where subscript 1 refers to conditions from the calculation sheet and subscript 2 refers to actual measured conditions. $P$ is absolute pressure, $T$ is absolute temperature (K), and $Z$ is the compressibility factor.

Split Range

To increase measuring dynamics (typically 6:1 to 12:1), multiple differential pressure transmitters with different measuring ranges can be connected simultaneously to evaluation units like the RMS621 or RMC621.

Mounting Positions

The system can be mounted in various configurations depending on the medium and pipe orientation:

• Liquids: Transmitter mounted below the pipe; impulse pipes sloped at least 1:15 towards the process connection.
• Gases: Transmitter mounted above the pipe; impulse pipes sloped at least 15:1 towards the process connection.
• Steam: Requires condensate chambers mounted at the same level, below the transmitter. Impulse pipes sloped at least 1:15. A 5-valve manifold can simplify piping.

Versions

• Compact Version: Pitot tube, manifold, and transmitter are pre-assembled.
• Remote Version: Components are delivered separately for on-site mounting, recommended for high temperatures or space constraints.

Installation and Process Conditions

• Up- and Downstream Lengths: Minimum straight pipe lengths are required upstream and downstream of the Pitot tube to ensure flow homogeneity. These vary based on pipe diameter (D) and the type of obstacle (e.g., bends, valves). See the table on page 14 for specific requirements.
• Homogeneity: The fluid must be homogeneous, and the pipe must remain completely filled.
• Temperature and Pressure Fluctuations: Significant fluctuations should be avoided. Compensation may be necessary.
• Reynolds Number: A turbulent flow is required, with a minimum Reynolds number of Re ≥ 3150 for reliable measurement.

Material Temperature Limits

Temperature limits for various materials used in construction are provided, including steels, heat-resistant steels, stainless steels, Duplex, Monel, Hastelloy, and plastics (PVC, PP, PE, PVDF, PTFE). Values are guide values and must be checked based on pressure and medium.

Pressure-Temperature Curves

Pressure-temperature curves are provided for flanges according to:

• EN1092-1:2001 (PN100, PN63, PN40, PN25, PN16, PN10)
• ANSI B16.5-2003 (Cl. 2500, 1500, 900, 600, 300, 150)

These curves illustrate the permissible operating pressures at different temperatures for various materials.

Mechanical Construction

• Probe Profile/Length: Available probe lengths vary by model:
  • DP61D: 40 ... 140 mm (1.6 ... 5.5")
  • DP62D: 95 ... 2100 mm (3.8 ... 82")
  • DP63D: 300 ... 4000 mm (12 ... 157")
• End Support: Required for probe lengths above 750 mm and optional for shorter probes.
• Dimensions: Detailed dimensions for compact and remote versions are provided.
• Weight: Weights for different configurations (remote/compact, cutting ring/flange) are listed. Additional weight per millimeter of probe length and for end supports is also specified.
• Process Connection: Options include cutting ring, flange (EN/ANSI), and Flowtap versions for in-process Pitot tube exchange. Pressure ratings range from PN6 to PN250 / Cl.150 to Cl.1500.
• Mounting Nozzle Extension: Available in lengths from 50 mm to 130 mm and longer, primarily for insulated pipes.
• Differential Pressure Connection: Various options are available for the impulse lines, including welding connections, G½ DIN 19207, NPT, Ermeto 12S cutting rings, and flanges, with suitability for steam noted for specific types.

Integrated Temperature Sensor

• The DP62D and DP63D models can be equipped with an integrated Pt100 temperature sensor.
• Measuring Range: -200 °C to +600 °C (-328 °F to +1112 °F).
• Output Signals: 4...20mA, 4...20mA HART, PROFIBUS PA, or Pt100 (4-wire).
• Applicable for pressure ratings up to PN40/Class 300.

Product Structure Overview

A detailed breakdown of product features and their validity for DP61D, DP62D, and DP63D is provided, covering:

• Primary element (Application, Version)
• Pipe and Orientation
• Process Connection
• Probe Length
• Mounting Nozzle
• Extension Mounting Nozzle
• End Support
• Differential Pressure Connection & Seal
• Integrated Temperature Sensor (Pt100)
• Accessories (Condensate Chambers, Shut-Off Valve, Manifold, Purge Unit)
• Differential Pressure Transmitter (Deltabar)
• Additional Options

Ordering Information

Specific product structures with example codes for the DP61D are shown, detailing options for application, version, pipe orientation, process connection, probe length, and mounting nozzle.

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Disclaimer: This summary is based on extracted text and may not capture all figures, footnotes, or revisions. Contractual data must be verified against the specific OEM PDF revision used for the project.

Official datasheet (PDF)

Lenntech datasheet mirror