STD720-E1HS4AS-1-0-CHC-11C-B-20A0-F1-0000 Honeywell Pressure Transmitter

Overview

The STD720-E1HS4AS-1-0-CHC-11C-B-20A0-F1-0000 Honeywell Differential Pressure Transmitter is a high-performance smart field instrument belonging to the SmartLine STD700 series. Designed for accurate flow, level, and differential pressure measurements in severe processing environments, this unit features a Tantalum diaphragm with 316 Stainless Steel process heads to handle aggressive fluids. It generates a stable 4-20mA analog output with digital HART communication, making it ideal for integration into advanced control architectures.

Configuration Architecture Breakdown

• Honeywell SmartLine STD700 Series
  • Measurement Range [STD720]: Span up to 400 inH2O (1000 mbar) / Min Span 4.0 inH2O (10 mbar)
  • Head & Diaphragm Material [H]: 316 Stainless Steel Process Heads with Tantalum Diaphragms
  • Fill Fluid [1]: Silicone Oil 200
  • Process Connection [H]: 1/2" NPT Female Matched to Head Material
  • Bolt & Nut Hardware [C]: Carbon Steel Flange Bolts
  • Vent/Drain Configuration [4]: Dual-Ended Dual Vent, End Location, Matched Material
  • Gasket Material [A]: Glass-Filled PTFE (Teflon)
  • Static Pressure Rating [S]: Standard High Static Pressure up to 4500 psig (315 bar)
  • Head Orientation [1]: Standard Configuration (High Side Left, Low Side Right)
  • Agency Approvals [A]: FM Explosion-Proof, Intrinsically Safe, Non-Incendive, & Dustproof
  • Electronics Housing [A]: Polyester Powder Coated Aluminum (1/2" NPT Conduit Entries)
  • Output & Protocol [H]: 4-20mA DC Output with HART Digital Communications Protocol
  • Software & Fail-Safe [1]: Advanced Diagnostics Enabled, High Fail Mode (>21.0 mA)
  • Mounting Hardware [1]: Carbon Steel Angle Mounting Bracket Included

Technical Specifications & Operational Matrix

Compatible Hardware & Process Application Scenarios

• Compatible Field System Hardware:
  • Honeywell Experion PKS, TDC3000, and Safety Manager DCS platforms.
  • Third-party PLCs and flow computers supporting 4-20mA HART point-to-point connections.
  • Orifice plates, Venturi tubes, and averaging Pitot primary flow elements.
• Target Process Applications:
  • Corrosive liquid and gas differential pressure measurement requiring Tantalum diaphragm protection.
  • Boiler drum water level monitoring and pressurized vessel hydrostatic level calculation.
  • High line-pressure natural gas metering stations up to 4500 psig static pressure limits.

Diagnostic & Predictive Monitoring Capabilities

The internal micro-controller onboard the STD720-E1HS4AS-1-0-CHC-11C-B-20A0-F1-0000 Honeywell transmitter continuously executes embedded self-diagnostics. The firmware constantly monitors piezoresistive sensor bridge health, internal temperature variations, loop supply voltage integrity, and EEPROM checksum stability. If a sensor diaphragm over-pressure shift or electrical open-circuit condition is detected, the transmitter immediately forces the output current to a dedicated high alarm state (>21.0mA), broadcasting precise diagnostic fault codes via HART to alert maintenance teams before process shutdown occurs.

Global PLC Spare HUB's Insight

In chemical processing installations handling aggressive media, standard 316L diaphragms often suffer from pitting or hydrogen embrittlement over prolonged exposure. When commissioning the STD720-E1HS4AS-1-0-CHC-11C-B-20A0-F1-0000, selecting the Tantalum diaphragm option provides superior chemical resistance against harsh acids and chlorine compounds. On a recent retrofitting project for an industrial acid recovery skid, replacing degraded standard transmitters with this Tantalum-wetted Honeywell SmartLine unit completely stopped baseline calibration drift, extending instrument maintenance intervals from 3 months to over 18 months.

Warranty, Logistics & Shipping Terms

• Item Condition: 100% Factory New and Original Equipment
• Quality Warranty: Comprehensive 12-Month Guarantee from shipment date
• Dispatch Window: Fast order handling, shipping within 24 to 48 hours post-payment
• Global Express Delivery: World-class shipping services via FedEx, UPS, and DHL Express

Engineering Selection & Application FAQ

What is the main benefit of specifying Tantalum diaphragms instead of standard 316L SS?

Tantalum exhibits exceptionally high corrosion resistance against strong acids, chlorine solutions, and aggressive chemicals where standard 316L stainless steel would experience rapid chemical attack or pinhole leakage.

How does static line pressure affect differential pressure measurement on this unit?

The STD720 features high static pressure compensation rated up to 4500 psig (315 bar). Internal processing algorithms correct for static pressure effects to ensure stable differential readings across high-pressure gas pipelines.

Can I reconfigure the zero and span points without built-in local display pushbuttons?

Yes. Because this model features option '0' (No external display or buttons), zero and span calibrations are easily performed using any standard handheld HART field communicator or asset management software via the loop terminals.

What happens when the transmitter encounters an internal sensor failure?

With option '1' software configuration, the transmitter drives the output signal to a High Fail mode exceeding 21.0 mA, giving control room alarms clear, immediate indication of an instrument fault state.

Does this transmitter come pre-assembled with a mounting bracket?

Yes. The unit includes a carbon steel angle mounting bracket (Option 1) suitable for 2-inch pipe stand or flat wall mounting installations in industrial environments.

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