Honeywell Process Solutions · Pressure Transmitters
SmartLine STD800 Differential Pressure Transmitter
Part number STD820-E1AC4AS-1-A-AHB-11S-A-50A0-0000
Piezoresistive DP transmitter, 0–1,000 mbar (STD820), ±0.0375 % accuracy, 400:1 turndown, modular SmartLine design, 4–20 mA HART 7, SIL2/3.
- CE
- ATEX
- IECEx
- SIL2
- HART 7
Overview
The SmartLine STD800 is Honeywell's differential-pressure transmitter with the best accuracy in its class: ±0.0375 % of span with a 400:1 turndown and ±0.01 % per year stability. The STD820 covers spans to 1,000 mbar for DP flow and level; STD810, STD830 and STD870 extend the family from 25 mbar to 210 bar. Its modular design lets the display, communications and sensor module be exchanged in the field, and the basic or advanced graphic display shows process values, trends and maintenance messages in plain language. Fully compatible with Experion but equally at home on any HART or FOUNDATION Fieldbus host; the example key number is a 316L/Hastelloy unit with advanced display and ATEX approval.
Key features
- Accuracy ±0.0375 % of span, 400:1 turndown, ±0.01 %/year stability
- Modular: field-replaceable display, electronics and sensor module without recalibration
- Advanced graphic display with trends, multilingual messages and external-zero button
- 4–20 mA HART 7, FOUNDATION Fieldbus, DE protocol for legacy Honeywell systems
- SIL2/3 per IEC 61508; ATEX, IECEx, FM, CSA, NEPSI; 5-year warranty
Typical applications
- DP flow in utility and process headers
- Vessel and column level
- Filter, strainer and heat-exchanger differential
- Experion-based DCS upgrades replacing ST3000 transmitters
Technical specifications — STD820-E1AC4AS-1-A-AHB-11S-A-50A0-0000
| Measurement | |
|---|---|
| Measuring principle | Piezoresistive silicon |
| STD820 span | 2.5 mbar to 1,000 mbar |
| Reference accuracy | ±0.0375 % of span |
| Turndown | 400:1 |
| Static pressure limit | 310 bar |
| Output | |
| Signal | 4–20 mA HART 7 (FF, DE options) |
| Display | Basic or advanced graphic display |
| Power | 10.8–42.4 V DC |
| Process | |
| Process temperature | -40…+125 °C |
| Process connection | 1/4 NPT; 1/2 NPT adapters; 3- and 5-valve manifolds |
| Wetted materials | 316L SST, Hastelloy C-276, Monel, tantalum |
| Environment | |
| Ambient temperature | -40…+85 °C |
| Enclosure | IP66/67, NEMA 4X, aluminium or 316 SST |
Specifications are summarised from the manufacturer's documentation for selection purposes. Always confirm against the current datasheet before design-in; we send the datasheet and the exact ordering code with every quotation.
Related part numbers and alternatives
| Part number | Relationship | |
|---|---|---|
STG800 | SmartLine gauge pressure version | Quote |
STD700 | SmartLine STD700 — ±0.065 % accuracy, lower cost | Quote |
ST3000 STD924 | Previous generation — discontinued, STD820 is the recommended replacement | Quote |
Not sure which variant you need? Send us the nameplate photo or the old part number and we will identify the current equivalent.
Supply, documentation and lead time
What you receive
- Genuine Honeywell Process Solutions product in original packaging
- Commercial invoice and packing list; Certificate of Conformance on request
- Datasheet, declaration of conformity and country of origin as issued by the manufacturer
- Manufacturer warranty, period stated on the quotation
How we quote
- Reply within one business day with price, lead time and stock position
- Alternatives proposed when they improve price or delivery
- Incoterms of your choice: EXW Hai Phong, FOB/FCA, CIF/DAP to your site
- Consolidated shipments for multi-line orders; export documentation for buyers outside Vietnam
Indicative HS code 9026.20 — final classification is confirmed on the commercial invoice.
Frequently asked questions
How does the STD800 differ from the older ST3000 transmitters?
The STD800 keeps DE and HART compatibility with ST3000 loops but adds a modular housing, graphic display, 400:1 turndown and better accuracy. Mounting and process connections are the same, so one-for-one replacement is straightforward.
Can the display and electronics be replaced in the field?
Yes. SmartLine modules are plug-in and keep calibration data in the sensor module, so a display or electronics swap needs no recalibration.
Is the STD800 available from stock, and what is the lead time?
Typical lead time is 4–8 weeks from the factory depending on approvals; some HART configurations are stocked regionally. We confirm with the quotation.