Description
Honeywell STD725 is a high-accuracy SmartLine differential pressure transmitter designed for precise hydrostatic level measurement in pressurized and atmospheric tanks. With advanced stability, SIL2/3 safety certifications, digital diagnostics, and multiple communication options, it ensures reliable level monitoring in chemical, pharma, oil & gas, utilities, and process tanks.
🔧 STD725 — Key Technical Data & Selection Parameters
| Parameter | Specification / Details |
| Measurement Principle | DP measurement → hydrostatic level (H = ΔP / ρ·g) |
| Sensor Technology | Piezo-resistive + SmartLine electronics |
| Measuring Range | Up to 0–210 mbar … 0–210 bar depending on range code |
| Accuracy | Up to ±0.065% of span |
| Long-term Stability | ±0.02% of URL per year (10 years) |
| Output | 4–20 mA + HART (Optional: Fieldbus/DE) |
| Display | Backlit LCD with diagnostics |
| Wetted Materials | SS316L, Hastelloy, Monel (as per order) |
| Process Connections | 1/2″ NPT, flanged, manifold-mounted |
| Turndown | 100:1 |
| Temperature Limits | –40 °C to +120 °C (process) |
| Overpressure Protection | Up to 41 MPa (per range) |
| Safety Certifications | SIL2/3 compliant |
| Enclosure | IP66 / IP67 / NEMA 4X |
| Suitable Media | Liquids, chemicals, solvents, utilities |
| Typical Level Application | Pressurized tanks, atmospheric tanks, reactors, balance tanks, chemical dosing tanks |





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