SmartLine® ST700 Differential Pressure Transmitters bring smart technology to a wide spectrum of measurement applications ranging from furnace combustion airflow rate to hydrostatic tank gauging.
ST700 Differential Pressure Transmitters are ideal for critical process loops and high-value applications such as custody transfer, and energy and material balances. Six models are available with the following ranges:
| STD720/ STD725 | -400 to 400 in H2O | -1000 to 1000 mbar |
| STD730/ STD735 | -100 to 100 psi | -7.0 to 7.0 bar |
| STD770/ STD775 | -3000 to 3000 psi | -210 to 210 bar |
| Overview | |
|---|---|
| Models | STR735D, STR745G |
| Environmental Conditions | |
| Maximum Allowable Working Pressure (MAWP) | STR735D: 750 psig (51.7 bar) STR745G: 500 psig (35 bar); limited by body or seal rating |
| Ambient Temperature Limits | -55 to +90 deg C (Storage); LCD display: -20 to +70 deg C (Operation) |
| Relative Humidity | 0 to 100% RH |
| Measurement Type | Differential Pressure (DP) and Gauge Pressure (GP) with Remote Diaphragm Seals |
| Rangeability | Up to 100:1 (STR735D: 111:1) |
| Stability | Not explicitly stated, but optimized for minimal temperature effects |
| Processing & Performance Metrics | |
| Maximum Turndown Ratio | STR735D: 111:1 STR745G: 100:1 |
| Accuracy | Up to 0.075% of span (standard), 0.040% (optional for STR745G) |
| Communication & Protocols | |
| Output/Communications | 4 to 20 mA, HART (v7.0) |
| Functional & Control Features | |
| Sensor Technology | Piezoresistive sensor with static pressure & temperature compensation |
| Diagnostics | Comprehensive on-board diagnostics, critical/non-critical, SIL 2/3 certified |
| Standards & Certifications | |
| Safety Approvals | SIL 2/3 Certified, Dual Seal Design, NAMUR NE-43 Compliance, World Class Overpressure Protection |
| Approvals | FM, CSA, ATEX, IECEx, NEPSI, KOSHA, EAC, CCoE, UATR, SAEx, INMETRO, IEC 61508 SIL 2/3 |
| Technical Specifications | |
| Display Options | Modular LCD (Alphanumeric), Multiple screens, Configurable units, Multiple languages (EN, RU) |
| Supply Voltage | 10.8 to 42.4 VDC (IS versions limited to 30 VDC), 0 to 1,440 ohms load resistance |
| Pressure Range | STR735D: 100 psid (-100 to +100 psid, min span 0.9 psid) STR745G: 500 psig (-14.7 to +500 psig, min span 5 psig) |
| I/O Capabilities | |
| Response Time | Not explicitly stated, but similar SmartLine transmitters are as fast as 100 ms millisecond |
| Configuration | External Zero, Span & Configuration Capability; Three-Button Local Configuration |
| Models | STD720/ STD725, /STD730/ STD735, STD770/ STD775 |
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