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This is Honeywell SmartLine STD720 smart differential pressure transmitter with 100kPa measuring range. It adopts 316SS process head + 316L diaphragm, silicone oil filling, 1/4″ NPTF process connection, HART protocol, and with local display. Suitable for general industrial differential pressure measurement applications.
- Model Segment Definition (Full Breakdown)
| Segment | Code | Description |
| Series ID | ST700-STD720 | STD720: SmartLine differential pressure transmitter, range 100kPa, turndown ratio 100:1 |
| Process Wetted Material | E1 | E = Process head: 316 stainless steel; 1 = Diaphragm: 316L stainless steel |
| Connection & Bolt | AC4 | A = Process connection: Standard 1/4″ NPTF internal thread; C = Bolt/Nut material: Carbon steel (galvanized); 4 = Vent/Drain: Dual-ended, standard vent at end position |
| Fill Fluid | 1 | 1 = DC庐200 Silicone Oil (standard fill fluid, temperature range -40~121掳C) |
| Mounting Option | A | A = No mounting option (standard mounting) |
| Static Pressure Grade & Option | AHB | AH = Static pressure rating: 10MPa (1450psi); B = Option: With local display |
| Output & Protocol | 11S | 11 = Output: 4-20mA + HART protocol; S = Safety certification: General safety approval |
| Display & Material | A | A = Display type: Standard digital display; Material: Standard configuration |
| Additional Option | 00A0 | 00 = No additional options; A0 = Standard configuration without special functions |
- Core Specification Table
| Parameter Category | Detailed Specification | Remarks |
| Basic Parameters | ||
| Measurement Type | Differential Pressure (DP) | STD720 specially designed for DP measurement |
| Range | 0–100kPa (configurable down to 0–1kPa) | Turndown 100:1, Accuracy 0.05% Span |
| Static Pressure Rating | 10MPa (1450psi) | AH static pressure grade |
| Overpressure Capability | 1.5 × Max static pressure | Safety overpressure protection |
| Accuracy & Stability | ||
| Accuracy Class | 0.05% Span | Includes linearity, hysteresis and repeatability |
| Temperature Effect | ±0.01% URL/°C | Full range temperature compensation |
| Long-term Stability | ±0.1% URL / 5 years | High stability design |
| Process & Ambient | ||
| Process Temperature | -40~121°C | Depends on fill fluid type |
| Ambient Temperature | -40~85°C | Standard operating range |
| Ingress Protection | IP67 / NEMA 4X | Dustproof and waterproof, suitable for harsh environments |
| Explosion-proof Certification | Optional ATEX / IECEx | Confirm by exact model |
| Electrical Characteristics | ||
| Supply Voltage | 12.2~35VDC | HART protocol requirement |
| Output Signal | 4-20mA + HART 5.0/7.0 | Digital communication superimposed on analog signal |
| Load Resistance | 0~1000Ω | Standard configuration |
| Response Time | 0.1~60 seconds | Configurable via HART |
| Mechanical Structure | ||
| Process Connection | 1/4″ NPTF internal thread (dual side) | Standard configuration |
| Diaphragm Material | 316L Stainless Steel | Corrosion resistant for most industrial media |
| Process Head Material | 316 Stainless Steel | Matched with diaphragm material |
| Bolt Material | Carbon Steel (Galvanized) | Standard; 316SS optional |
| Housing Material | Low-copper aluminum alloy with polyester powder coating | Lightweight and corrosion resistant |
- Accessory List (Standard + Optional)
Standard Configuration
- Transmitter Main Unit: Including sensor module, electronic module and housing
- Process Connection Gasket: Glass-filled PTFE (standard)
- Mounting Bracket: Standard bracket for pipe or wall mounting
- Terminal Block: Built-in terminal, supports 2-wire connection
- Operation Manual: Installation, commissioning and maintenance guidelines
- Calibration Certificate: Factory calibration record with traceable accuracy
Common Optional Accessories
| Accessory Type | Model / Description | Application |
| Communication Module | HART / DE Protocol Module | Digital communication expansion |
| Display Module | Remote Display Unit | High temperature / hazardous area installation |
| Mounting Fittings | Flange adapter, pipe bracket | Special mounting requirements |
| Process Fittings | Reducer adapter, sealing parts | Different interface conversion |
| Protection Device | Rain cover, Explosion-proof junction box | Harsh environment protection |
| Calibration Tool | HART Handheld Communicator, Calibration Software | On-site calibration and configuration |
- Competitor Replacement / Cross-brand Comparison
| Brand | Model | Core Parameter Comparison | Replaceability |
| Honeywell | STD720-E1AC4AS-1-A-AHB-11S-A-00A0 | 100kPa, 0.05% accuracy, 10MPa static pressure, HART, 316L diaphragm | Original same-series replacement |
| Rosemount(Emerson) | 3051CD0A02A1AB1H2L4M5 | 100kPa, 0.075% accuracy, 10.3MPa static pressure, HART, 316L diaphragm | High (confirm mounting dimension) |
| Yokogawa | EJA110A-DLS4A-92DA | 100kPa, 0.075% accuracy, 10MPa static pressure, HART, 316L diaphragm | High (protocol compatible) |
| Siemens | SITRANS P DS III | 100kPa, 0.075% accuracy, 10MPa static pressure, HART, 316L diaphragm | Medium (confirm turndown ratio) |
| ABB | 266DSH | 100kPa, 0.065% accuracy, 10MPa static pressure, HART, 316L diaphragm | Medium (mounting structure difference) |
Replacement Key Points:
- Match measuring range, accuracy grade and static pressure resistance
- Keep identical process connection type (NPTF / Flange)
- Ensure compatibility of communication protocol (HART version)
- Mounting dimension and weight shall meet site requirements
- Selection Guidelines & Alternative Solutions
Core Selection Factors
- Measuring Range: Confirm actual differential pressure; STD720 turndown 100:1 covers 0–1kPa ~ 0–100kPa
- Static Pressure Condition: System static pressure ≤10MPa (AH grade); higher pressure requires BH grade (20MPa)
- Media Property: Corrosive media requires Hastelloy C-276 or Monel diaphragm
- Temperature Range: Above 121°C select high-temperature silicone oil (DC®704) or fluorinated fill fluid
- Safety Certification: Explosion hazardous area select matched ATEX/IECEx certified model
- Communication Requirement: Choose HART/DE for remote configuration and diagnosis
Recommended Alternative Models
| Application Scenario | Recommended Model | Advantage |
| Standard Industrial DP Measurement | STD720-E1AC4AS-1-A-AHB-11S-A-00A0 | Cost-effective, fits most working conditions |
| Corrosive Media | STD720-E2HC4AS-1-A-AHB-11S-A-00A0 | Hastelloy C-276 diaphragm, resistant to strong acid & alkali |
| High Temperature (>121掳C) | STD720-E1AC4AS-3-A-AHB-11S-A-00A0 | DC庐704 high-temp silicone oil, range -40~204C |
| High Static Pressure (>10MPa) | STD720-E1AC4AS-1-B-BHB-11S-A-00A0 | BH grade, withstand 20MPa system pressure |
| Wireless Communication | STD720-E1AC4AS-1-A-AHB-16S-A-00A0 | WirelessHART protocol, reduce wiring cost |
Installation & Maintenance Recommendations
- Mounting Position: Avoid severe vibration and sharp temperature change; horizontal installation recommended
- Process Connection: Ensure good sealing to avoid leakage affecting measurement accuracy
- Wiring Requirement: Use shielded cable with single-end grounding to reduce EMI interference
- Calibration Cycle: Annual calibration recommended; shorten to 6 months under harsh conditions
- Fault Diagnosis: Read diagnostic data via HART communicator for fast troubleshooting
Honeywell STD720-E1AC4AS-1-A-AHB-11S-A-00A0 is a high-performance smart differential pressure transmitter. Featuring 0.05% high accuracy and 100:1 wide turndown ratio, it is widely applied in flow, liquid level and pressure measurement for chemical, petroleum, power and other industries. Modular design and rich optional configurations meet customized demands of various working conditions. During selection, focus on measuring range, static pressure, media characteristics and safety certification to match site operating conditions.
Applicable Industries & Applications for Honeywell ST700-STD720-E1AC4AS-1-A-AHB-11S-A-00A0
This model is a general industrial differential pressure transmitter with standard 316L diaphragm, regular silicone oil filling, HART protocol and general explosion-proof design. It is suitable for neutral, weakly corrosive, normal temperature and pressure working conditions.
Main Applicable Industries
- Petrochemical / Coal Chemical
Tank liquid level, distillation column differential pressure, orifice/Venturi DP flow, process pipeline differential pressure, filter blockage monitoring.
- Thermal Power / Cogeneration / Self-owned Power Plant
Boiler drum liquid level, duct/flue wind differential pressure, circulating water/desalted water flow, flue gas filter DP interlock.
- Water Treatment & Environmental Engineering
Municipal water supply & drainage, industrial wastewater, pure water/ultra-pure water system; tank level, membrane system inlet-outlet DP, sewage pipeline flow, grid filter differential pressure.
- Metallurgy & Steel / Non-ferrous Metal
Blast furnace duct negative pressure, dust removal pipeline DP, circulating cooling water flow, silo/tank level DP measurement.
- Pharmaceutical / Bioengineering
Purified water flow, fermenter liquid level, precision filter inlet-outlet DP; 316L material fits sanitary process conditions.
- HVAC & Building Automation
Industrial plant & commercial complex; air conditioning supply/return water differential pressure, duct wind pressure, unit filter blockage DP alarm.
- Cement Building Materials / Glass & Ceramics
Kiln wind pressure DP, dust bag differential pressure, silo DP level measurement, cooling water system monitoring.
- Food & Beverage / Pulp & Paper
Brewing, beverage, paper industry; slurry level, process water circulation DP, pipeline DP flow measurement.
- City Gas / Energy Regulating Station
Gas pipeline DP flow, regulator inlet-outlet differential pressure, pipe network pressure monitoring.
- Mining & Coal Preparation / Industrial Mines
Coal washing tank level, slurry pipeline DP, dust removal negative pressure monitoring, process water flow measurement.
General Measurement Scenarios (All Industries)
Liquid level measurement for closed / open tanks
Differential pressure flow measurement via orifice, nozzle and Venturi tube
Micro differential pressure / pressure monitoring for pipelines, air ducts and flues
Blockage DP alarm and interlock for filters, dust bags and filter cartridges
Inapplicable Working Conditions
Not suitable for strongly corrosive media (concentrated acid, strong alkali, chlorine), medium temperature＞121°C, system static pressure＞10MPa. Special diaphragm, high-temperature fill fluid or high static pressure version is required instead.
