Overview

This document provides detailed technical information about Riels Instruments' pressure switches, specifically the RIBWD series. It covers product specifications, construction materials, performance parameters, selection guidelines, and available options.

Product Specifications

• Protection and Standards: Weatherproof IP66 (EN 60529), explosion-proof Eex-d IICT6, NEMA 4X.
• Construction: Cast aluminum enclosure with oven-baked powder coating in hammertone grey; also available in stainless steel 316.
• Repeatability: Typically 0.2% of full scale.
• Measurement Units: Standard unit is Barg; optional units include PSI, Kg, and Pa.
• Process Connection: Standard 1/4" NPT (female) or BSP (female); other wetted parts and connections available per full catalogue.

Performance Parameters and Ranges

The document provides a comprehensive table of adjustable differential pressure ranges, maximum static pressures, maximum overrange pressures, proof pressures, and typical deadbands for various model codes (D359H, D302L, D304L, etc.). Key points include:

• Ranges vary from millibar to several bars, with differential ranges from 0.3 mBar up to 3450 Bar depending on model.
• Deadbands typically range from 0.15 mBar to 200 mBar.
• Static pressure influences setpoints and deadbands; differential pressure sensors are sensitive to static pressure changes.
• Specific diaphragm and O-ring materials are assigned per model type (Buna N, Viton, TCP, SS316).

Material Selection and Wetted Parts

• Wetted parts include diaphragms and O-rings made from Buna N, Viton, SS316, Teflon, and EPDM depending on application.
• Process connection materials include aluminum and stainless steel 316.
• Selection codes are provided for different combinations of diaphragm, O-ring, and connection types.
• Process temperatures supported range from -5°C to +90°C, with options for higher temperatures upon request.

Process Connection Options

• Standard sizes: 1/4" NPT female, 1/4" BSP female, 1/2" NPT male.
• Material options: Aluminum and stainless steel 316.
• Codes for each connection type and material are specified for ordering.

Enclosure and Accessories

• Enclosure options include aluminum and stainless steel 316 with conduit entries of 3/4" NPT female or M20x1.5.
• Accessories include cable glands, stainless steel tag key rings (with customizable text), vacuum protection plates for H2S environments and EEx(i) applications.

Microswitch Selection and Ratings

• Multiple microswitch options are available with various voltage and current ratings for AC and DC applications.
• Switch codes and their electrical ratings are provided, including standard and environmental proof (IP67) versions.
• Some DC ratings are not UL listed but have been validated by experience and third-party testing.
• Contact Riels Instruments for specific requirements or for D.P.D.T. switch configurations.

Installation and Mounting

• Pipe mount bracket sets are available for 2" pipes, including bolts and brackets.
• Note that vibration from foundations or processes may affect switch performance; mounting brackets do not eliminate this risk.

Important Notes and Disclaimers

• Ranges and deadbands are specified at 50% of maximum static pressure; static pressure affects sensor setpoints and deadbands.
• Wetted parts are not guaranteed due to varying process conditions and potential corrosion or permeation.
• Users should verify suitability of materials for their specific process fluids and conditions.
• Riels Instruments reserves the right to modify product specifications without prior notice.
• For differential pressure applications outside the specified ranges, contact Riels Instruments directly.

Summary

This technical sheet provides comprehensive guidance for selecting and specifying Riels Instruments pressure switches, including detailed performance data, material options, connection types, and accessory choices. It emphasizes the importance of considering static pressure effects, process compatibility, and environmental conditions to ensure optimal switch performance and longevity.