RCD - Venturi Differential Pressure Orifice Flow Meter for Liquids

Ultra-Rugged Differential Pressure Flow Measurement for Demanding Industrial Applications

The KOBOLD RCD differential pressure flow meter delivers reliable flow measurement from 0.13 to 622 GPM (0.5 to 2350 l/min) for water and 0.5 to 2750 Nm³/h for air applications. Engineered without moving parts, this Venturi-based flow meter eliminates wear-related failures common in turbine and variable area designs, significantly reducing maintenance costs and unplanned downtime in critical process applications.

Superior Reliability Through No-Moving-Parts Design

Unlike traditional mechanical flow meters that suffer from bearing wear, shaft deterioration, and calibration drift, the RCD utilizes a precision-machined Venturi orifice that generates consistent differential pressure proportional to flow rate. This solid-state primary element maintains accuracy throughout its service life, typically exceeding 10 years in continuous operation. The differential pressure measuring cell features mechanical stops that protect against overflow conditions, providing a safeguard against system upsets or pressure surges.

Flexible Configuration Options Meet Diverse Application Requirements

Choose from aluminum bronze construction for cost-effective general service applications or stainless steel for aggressive chemicals and high-purity processes. Three display options address different automation needs:

• Mechanical pointer display (270°): Provides local indication without power requirements, ideal for remote locations.
• Compact electronics: Integrates 3-digit LED display with 4-20 mA output and dual PNP/NPN switching outputs for direct PLC integration
• ADI-1 electronic controller: Features bar graph visualization, 5-digit precision display, dual relay outputs rated 250 VAC/5A, and universal power supply accepting 100-240 VAC

Sample Industrial Applications and Performance Advantages

The RCD excels in applications where traditional flow meters fail prematurely. Chemical processing facilities utilize the stainless-steel version to monitor corrosive liquids without degradation. HVAC systems leverage the wide turndown ratio to accurately measure both minimum and maximum flow conditions. Water treatment plants benefit from the meter's ability to handle suspended solids that would damage turbine meters. The universal mounting orientation eliminates installation constraints, while the compact design fits into tight piping configurations where straight-run requirements cannot be met.

Technical Specifications

An operating temperature range from -4°F to 212°F (-20°C to 100°C) accommodates both chilled water and hot water applications. The ±3% full-scale accuracy and 580 PSIG pressure max meets requirements for most industrial monitoring and control applications. Available in connection sizes from ½" to 3" NPT (G½ to G3), the RCD integrates into existing piping systems without extensive modifications. The IP65-rated enclosure withstands washdown environments, while the cast aluminum display housing resists impact damage in industrial settings.

Minimize Total Cost of Ownership

The RCD's no-moving-parts design delivers long-term value by eliminating bearing replacements, rotor refurbishments, and recalibration services required by traditional technologies. Facilities typically recover the price differential within 18 months through reduced maintenance labor and eliminated spare parts inventory. The meter's resistance to flow-induced wear ensures consistent accuracy without drift, preventing costly process variations and quality issues. Optional magnetic filters (model MFR) protect pressure sensing ports from ferrous contamination, further extending service intervals in challenging applications.

Application Guide Required for Product Specification

**This product requires completion of our Application Guide before specification and ordering.**

This product line offers multiple configuration options and technical specifications that must be precisely matched to/calibrated for your specific application requirements. Unlike standard configurable items, these products are engineered solutions that require detailed application information to ensure optimal performance.

The Process

• Complete the Application Guide - Provide detailed information about your specific application
• Technical Review - Our engineering team reviews your requirements
• Product Specification - We specify the exact configuration for your needs
• Quotation & Ordering - Receive your custom quote with precise part numbers

Important Notice

Unless this is a repeat order of a previously specified product with Kobold, we cannot accept orders or provide quotations without a completed Application Guide. Product numbers selected without proper application review may not meet your system requirements and could result in performance issues or compatibility problems.

Even if you believe you've identified the correct part number, the Application Guide process is required to verify compatibility and ensure a streamlined quote/order process.

Ready to get started?

The PDF Application Guide can be downloaded directly from this product page in the “Resource Tab” below and is also attached to the end of the product datasheet. Completed forms can be submitted to customerservice@koboldusa.com.

Need help filling it out? Contact our engineering team: call 412-788-2830 or schedule a free online engineering consultation at your convenience.

Important Notice: Transitioning to U.S. Manufacturing

Due to the ongoing implementation of EU Directive 2020/2184 that restricts brass materials, product availability is subject to change at any time. We are actively reshoring production of our brass flowmeter models to U.S. facilities to ensure continued supply. Not all products can/will be reshored. During this transition, stock availability may fluctuate between the time of quotation and purchase order placement. We appreciate your patience as we work to establish our domestic supply chain and remain committed to providing you with the same high-quality products made closer to home.