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ABB 266DSH Differential Pressure Transmitter  

1. Key Parameters

• Product Model: 266DSH
• Order Code Reference: Configurable with process connection kits (e.g., 3BSE038461R1 for G-thread, 3BSE038462R1 for NPT) and wetted material options (316L stainless steel, Hastelloy C-276)
• Product Series: ABB 266 Series Industrial Differential Pressure Transmitters (Universal Application, Smart HART-Enabled)
• Core Function: Measures differential pressure (ΔP) between two process ports; calculates derived variables (flow, level) via built-in algorithms; converts signals to 4~20mA+HART; supports remote calibration/diagnostics; ensures precise process control and anomaly detection
• Measurement & Electrical Specifications:

  Parameter	Details	Performance Metrics
  Differential Pressure Range	Configurable: 0~1 kPa to 0~1 MPa (gauge/absolute pressure reference); Overrange capacity: 2× rated ΔP (sustained), 5× rated ΔP (peak, 10s)	Covers low-ΔP (filter monitoring) to high-ΔP (hydraulic systems) applications
  Accuracy Class	±0.075% of full scale (FS) at 25℃; ±0.15% FS over operating temperature range (-40℃~+85℃); Non-linearity: ≤±0.05% FS	Ensures precise flow/level control (e.g., ±0.1% accuracy for water distribution flow meters)
  Output Signal	4~20mA DC (2-wire loop-powered) + HART 7 protocol (superimposed for configuration, diagnostics, and derived variable calculation)	Compatible with standard 4~20mA process loops; HART enables remote flow/level parameter tuning
  Power Supply	12~30V DC (loop power); Typical current consumption: ≤3.8mA (at 4mA output)	Low power draw for energy efficiency; works with existing loop infrastructure
  Response Time	≤100ms (90% step response, standard mode); ≤20ms (fast mode, configurable)	Captures rapid ΔP changes (e.g., pump startup, filter clogging) for timely process adjustment
  Derived Variables	- Flow: Supports square-root extraction (for orifice plates, Venturi tubes) - Level: Calculates liquid level in tanks (via ΔP vs. height correlation) - Pressure: Measures static pressure (optional, up to 10 MPa)	Flow calculation accuracy: ±0.1% of measured value

• Mechanical & Process Compatibility:
  • Process Connection: Standard: G 1/2" male (both high/low ports); Optional: NPT 1/2", M20×1.5, flange-mounted (ANSI 150#, DIN PN16)
  • Wetted Material: Standard: 316L stainless steel (diaphragm, process body); Optional: Hastelloy C-276 (for strong acids/alkalis), Monel 400 (for seawater)
  • Enclosure Material: Aluminum alloy (epoxy coating, UL94 V-0) or 316L stainless steel (optional for corrosive atmospheres)
  • Protection Rating: IP67 (standard, dust-tight/waterproof against temporary immersion); IP68 (optional, submersible up to 2m depth)
  • Dimensions (W×H×D): 80mm × 140mm × 65mm (excluding process connections); Compact design for tight installations (e.g., skid-mounted systems)
  • Weight: Approximately 350g (aluminum enclosure); 520g (316L stainless steel enclosure)
  • Display (Optional): 2-line backlit LCD (shows ΔP, flow, level, or static pressure); 4 pushbuttons for local configuration
• Environmental Ratings:
  • Operating Temperature Range: -40℃~+85℃ (-40℉~185℉); Optional extended range: -50℃~+100℃
  • Storage Temperature Range: -50℃~+100℃ (-58℉~212℉)
  • Humidity Tolerance: 0~100% RH (including condensing, 40℃; suitable for damp process areas)
  • Vibration Resistance: 10~2000Hz, 2g acceleration (IEC 60068-2-6; ≤0.01% FS measurement drift)
  • Shock Resistance: 50g acceleration (11ms duration, IEC 60068-2-27; maintains structural/measurement integrity)
  • Corrosion Resistance: ISO 9227: 500 hours salt spray test (316L); 1000 hours (Hastelloy C-276) | Resists industrial chemicals and seawater |
• Compliance Standards: IEC 61298-2 (process transmitters), EN 61000-6-2 (EMC immunity), ATEX Ex d IIC T6 (hazardous area, optional), IEC 61508 (SIL 2 capable), CE, RoHS, FDA 21 CFR Part 177 (for food/pharmaceutical contact)

2. Key Features

• High Measurement Precision: ±0.075% FS accuracy and low temperature drift (≤±0.15% FS) ensure reliable measurement of critical process variables—e.g., ±0.1% accuracy for flow control in chemical dosing systems, preventing over/under-dosing and product waste.
• Multi-Variable Calculation: Built-in algorithms for flow (square-root extraction) and level (ΔP-to-height conversion) eliminate the need for external signal converters—simplifies system integration and reduces cost by 25% compared to discrete ΔP transmitters + flow calculators.
• HART 7 Smart Communication: Integrated HART 7 protocol enables remote calibration, parameter adjustment, and diagnostics (e.g., diaphragm fouling alerts) via ABB FieldCare software or HART communicators—cuts on-site maintenance time by 60% and minimizes process downtime.
• Rugged Process Compatibility: 316L stainless steel wetted parts (Hastelloy optional) and IP67/IP68 protection withstand corrosive media (e.g., sulfuric acid, seawater) and harsh environmental conditions—ensures 99.9% uptime in chemical, offshore, and water treatment applications.
• Flexible Installation: Multiple process connection options (G-thread, NPT, flange) and compact design adapt to diverse installation scenarios—e.g., skid-mounted systems (tight spaces), tank level measurement (flange-mounted), or pipeline flow (threaded connections).
• SIL 2 Safety Compliance: Meets IEC 61508 SIL 2 requirements, making it suitable for safety-instrumented systems (SIS)—e.g., high-ΔP shutdown for reactor overpressure, ensuring low dangerous failure rates (<100 FIT) and compliance with global safety standards.
• Low Power Consumption: 2-wire loop-powered design (12~30V DC, ≤3.8mA) simplifies wiring and reduces energy costs—compatible with legacy 4~20mA systems, avoiding costly infrastructure upgrades.

3. Application Fields

• Process Industry Flow Measurement: Primary application—ΔP-based flow control for liquids/gases:
  • Chemical Plants: Measures flow of corrosive chemicals (e.g., hydrochloric acid, caustic soda) via orifice plates; Hastelloy C-276 wetted parts resist corrosion, while HART flow algorithms ensure ±0.1% accuracy for batch dosing—prevents product defects from flow deviations.
  • Oil Refineries: Monitors flow of crude oil and refined products (e.g., gasoline) in pipelines; high ΔP range (0~1MPa) handles pipeline pressure conditions, and vibration resistance (2g) ensures stability near pumps/compressors.
• Tank Level Monitoring: Calculates liquid level via ΔP between tank bottom and top:
  • Water Treatment Facilities: Measures level of raw water, sludge, or treated water in tanks; IP67 protection withstands outdoor weather (rain, dust), and condensing humidity tolerance (100% RH) avoids measurement drift in damp tank environments.
  • Petrochemical Storage: Monitors level of diesel, gasoline, or crude oil in storage tanks; 316L stainless steel wetted parts resist hydrocarbon corrosion, and HART remote monitoring eliminates the need for manual level checks (reducing safety risks).
• Filter & Equipment Condition Monitoring: Detects clogging via ΔP across filters/heat exchangers:
  • Food Processing Plants: Monitors ΔP across milk/beer filtration systems; FDA-compliant materials (316L, EPDM gaskets) avoid product contamination, and LCD display shows real-time ΔP—alerts operators to replace filters before flow loss impacts production.
  • Power Plants: Tracks ΔP across turbine oil filters and heat exchanger tubes; fast response time (≤20ms) detects sudden clogging, preventing equipment damage from oil contamination or reduced cooling efficiency.
• Hydraulic & Pneumatic System Control: Ensures stable pressure differences in industrial machinery:
  • Automotive Manufacturing: Measures ΔP in hydraulic press circuits; high ΔP range (0~1MPa) handles press pressure demands, and shock resistance (50g) withstands mechanical impacts during stamping operations.
  • Aerospace Component Testing: Monitors ΔP in aircraft hydraulic test rigs; high accuracy (±0.075% FS) ensures precise test conditions, and extended temperature range (-50℃~+100℃) adapts to extreme test environments.

The structure and details of the product：

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