- Automation & ControlView all 1,742 products
- AC Drives
- Industrial Communications
- PLC & I/O Cards
- Vibration Monitoring
- Automation Accessories
- Controllers & Data Acquisition
- CCTV & Security
- Safety Switches & Guard Locking
- Isolator & Barrier
- Encoders
- Industrial Computers
- Servo Drives
- Motor Soft Starters
- HMI Displays
- Pneumatic Cylinders
- Automation Software
- Machine Vision
- Robotics
Brand: Honeywell
Honeywell SmartLine STD800 Differential Pressure Transmitter
Description
STD800 SmartLine differential pressure transmitter
The Honeywell SmartLine STD800 is a differential pressure (DP) transmitter that measures the difference between two process pressures, and it is the family member used for flow across an orifice plate or venturi, filter and strainer pressure drop, and hydrostatic level in closed vessels. A piezoresistive silicon sensor combines differential, static pressure and temperature measurement in one element, so the transmitter corrects itself for line pressure and temperature. Seven Star LLC supplies the STD800 in Oman and the GCC as an independent supplier in Muscat.
This page covers the full STD800 range of five models, from a 10 inH2O low-DP unit up to a 3,000 psi version, and explains the choices that matter when a DP transmitter is specified.
STD800 models and ranges
| Model | Upper / lower range limit | Max turndown | Stability (% URL per year, 15 years) | Reference accuracy, % of span (std / opt) | MAWP |
|---|---|---|---|---|---|
| STD810 | 10 inH2O / −10 inH2O (24.9 mbar) | 100:1 | 0.15 | 0.035 | 50 psi (3.45 bar) |
| STD815 | 100 inH2O / −100 inH2O (249 mbar) | 200:1 | 0.02 | 0.0325 / 0.025 | 2,500 psi (172 bar) |
| STD820 | 400 inH2O / −400 inH2O (996 mbar) | 400:1 | 0.01 | 0.0325 / 0.025 | 4,500 psi (310 bar) |
| STD830 | 100 psi / −100 psi (6.89 bar) | 200:1 | 0.02 | 0.0325 / 0.025 | 4,500 psi (310 bar) |
| STD870 | 3,000 psi / −100 psi (206.84 bar) | 200:1 | 0.01 | 0.0325 / 0.025 | 4,500 psi (310 bar) |
STD820, STD830 and STD870 can optionally be rated to a 6,000 psi (420 bar) MAWP. Static pressure limit, MAWP and overpressure limit are the same figure for these transmitters, and the datasheet de-rates this to 3,000 psi from −26 to −40 °C for models other than the STD810 and STD815.
STD800 technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Honeywell / STD800 (SmartLine differential pressure; order code built from model selection tables) |
| Rangeability | Up to 400:1 (STD820) |
| Output / protocol | 4 to 20 mA with HART 7 or Honeywell DE; FOUNDATION Fieldbus |
| Supply voltage at terminals | HART 10.8 to 42.4 VDC; DE 15 to 49.3 VDC; FOUNDATION Fieldbus 9.0 to 32.0 VDC |
| Response time | 90 ms for DE and HART analog output; 150 ms for FOUNDATION Fieldbus (host dependent) |
| Damping | HART 0 to 32 s in 0.1 s steps (default 0.5 s); DE discrete values from 0 to 32 s |
| Ambient temperature, rated | −40 to 85 °C (−40 to 185 °F) |
| Meter body temperature, rated | −40 to 110 °C (operative limit 125 °C) |
| Barrier diaphragm | 316L SS, Hastelloy C-276, Monel 400, tantalum, gold-plated 316L, C-276 or Monel 400 |
| Head gaskets | Glass-filled PTFE standard; Viton or graphite optional |
| Fill fluid | Silicone 200, Silicone 704, CTFE or NEOBEE M-20 (STD810: Silicone 200 or NEOBEE only) |
| Process connection | 1/4 in NPT, or 1/2 in NPT with adapter (meets DIN requirements) |
| Mounting | Standard bracket for 2 in (50 mm) vertical or horizontal pipe |
| Housing | Polyester powder-coated low-copper aluminium; Type 4X / IP66 / IP67; stainless steel optional |
| Weight | 8.3 lb (3.8 kg) with aluminium housing |
| Safety | IEC 61508 SIL 2 non-redundant, SIL 3 redundant (Exida and TÜV Nord) |
How the STD800 measures differential pressure
High and low side process pressures act on isolating diaphragms at each end of the meter body, and silicone or fluorinated fill fluid carries both pressures to the sensor. The sensor reports the difference and, at the same time, the static pressure and temperature, so the electronics compensate for line-pressure and temperature shifts. The datasheet shows static pressure effects for each model, which is why a high-pressure DP service should be checked against the combined accuracy tables and not just the headline accuracy.
For flow work, the transmitter can display a calculated square-root flow value in addition to the analog output. The advanced display can show a bar graph or a trend graph and a Health Watch indicator, and the diagnostics are divided into critical and non-critical items. A plugged impulse line detection option is available, and a dual or triple calibration option stores up to three customer ranges.
STD800 selection and ordering checklist
- Select the range code from the maximum differential pressure and the minimum span you need; avoid selecting so large a model that the working span exceeds the turndown the accuracy tables allow.
- Check static (line) pressure against the MAWP of the chosen model, including the 6,000 psi option when needed.
- Wetted materials and fill fluid: use 316 stainless steel heads for water service; Silicone 704 has a minimum rating of 0 °C and CTFE of −40 °C.
- Process adapters and bolting: 1/4 in NPT is standard; 1/2 in NPT adapter, NACE bolting, Monel K500, super duplex and B7M are listed options.
- Protocol and display: HART, DE or Fieldbus, with a standard or advanced display and optional zero and span buttons.
- Approvals: FM, CSA, ATEX, IECEx and others for hazardous areas.
- Manifold or impulse line mounting arrangement and bracket material.
STD800 installation, commissioning and maintenance
Install the STD800 on the bracket supplied, using a three-valve or five-valve manifold so that the transmitter can be isolated and equalized. Zero the transmitter with both sides equalized after any mounting change, then check the high side and low side connections against the flow direction. Wet legs and dry legs in level work must be filled or drained to match the programmed zero.
Honeywell lists calibration verification every four years as typical. The electronics, display and lightning protection modules can be swapped without recalibrating the meter body, so one spare module set can cover several transmitters on the same site.
Typical applications of the STD800 in Oman and the GCC
In the region the STD800 is used for orifice and venturi flow measurement in oil and gas gathering and export lines, filter differential pressure on seawater intake screens and cooling water strainers, drum level in power and desalination plants, and furnace draft and duct differential pressure measurement. A transmitter that sits in summer sun needs a shade or a sun shield, and its housing should have sealed cable glands to keep dust and humidity out.
Related SmartLine models
The same ST 800 platform includes the STA800 for absolute pressure and the STF800 flange-mounted version used for level on open or closed tanks. The STD800 is the right choice when you can use impulse lines or a manifold, and it shares its electronics, display and configuration tools with its siblings.
STD800 information to send with an RFQ
- Model code (STD810, STD815, STD820, STD830 or STD870) and calibrated differential range
- Static pressure, process fluid and temperature
- Wetted material, fill fluid and gasket
- Output protocol, display and hazardous-area approval
- Manifold, bracket, adapters and bolting
- Quantity and delivery location
Documents and quotation
A Honeywell STD800 technical specification (34-ST-03-82) is attached on this page. It includes the model selection tables, so you can check each code against your requirement.
Send the STD800 model or your process data and we will prepare a quotation for Oman and the GCC.
Other Models in the Smartline St800 Range
Seven Star LLC supplies models from the Smartline St800 range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.
| Model | Category | |
|---|---|---|
| Honeywell SmartLine STA800 Absolute Pressure Transmitter | Pressure Instrumentation | View details |
| Honeywell SmartLine STD800 Differential Pressure Transmitter | Pressure Instrumentation | You are viewing this model |
Datasheets & Documents
- Datasheet Honeywell STD800 Specification Download
Reviews (0)
About brand
Honeywell is the American industrial technology group whose products on this site cover gas and flame detection, pressure transmitters, flow measurement, gas metering, fire alarm systems and helicopter rotor balancing equipment. Its roots go back to a thermostat business in Minneapolis in 1885 and to Mark Honeywell's heating company, which merged with it in 1927. Several brands we list have joined Honeywell over the years: Gent fire systems of Leicester (part of Honeywell since 2005), Chadwick-Helmuth (a Honeywell business unit from 2002) and Elster gas metering (acquired around the end of 2015).
Seven Star LLC is an independent supplier in Muscat. We list Honeywell gas detectors and sensors, transmitters, Elster gas meters and flow computers, Gent fire alarm equipment and Chadwick-Helmuth balancers, and supply them and their spares in Oman and the GCC by part number.
Honeywell company profile
| Origins | 1885, Minneapolis (Butz thermostat business); merged with Mark Honeywell's company in 1927 |
|---|---|
| Brands in our range | Honeywell Analytics gas detection, SmartLine transmitters, Elster gas metering, Gent fire detection, Chadwick-Helmuth rotor track and balance |
| Gent | Founded in Leicester, UK, around 1872 by John Thomas Gent; part of Honeywell since 2005 |
| Elster | Gas, water and electricity metering; bought by Honeywell from Melrose, deal completed around the end of 2015 |
Milestones
- 1885: The Butz thermostat business starts in Minneapolis.
- 1927: It merges with Mark Honeywell's company.
- 2005: Gent fire detection (Leicester, UK) becomes part of Honeywell.
- 2015: Honeywell completes the purchase of Elster from Melrose around the end of the year.
Honeywell products we list
| Family | Models | Typical use |
|---|---|---|
| Fixed gas detectors | Searchline Excel, Searchline Excel Plus, 02104-N-XSSA, Sensepoint XCD RTD, Sensepoint XCD IR, XCD H2, Sensepoint XCL, Sensepoint XRL, OmniPoint, RAEGuard 2 PID | Flammable, toxic and VOC gas detection in process areas |
| Sensors, flame detection and control | SR-W-MP75C LEL sensor, SR-X2V O2 sensor, FS24X Plus flame detector, R4343E flame switch, System 57 card, 5704FS panel | Replacement sensors, fire detection and gas detection control panels |
| Transmitters and flow | SmartLine STG700, STG800, STR82D remote seal, VersaFlow Coriolis | Process pressure and mass flow measurement |
| Elster gas metering | Q.Sonic plus, TRZ2, Quantometer, RABO, IRM-3 DUO, EK280, EC 350, enCore FC1, enCore ZM1, gas-net F1, gas-net D2, GasLab Q2, USM display | Gas meters, volume correction and fiscal flow computing |
| Gent fire alarm systems | Vigilon Plus, Vigilon Compact Plus, Nano, Xenex, S-Quad detector, S-Cubed, ALD302 base, S4-34420 interfaces, loop card, repeat panel, mimic panel, XENS-850 call point, 74430 bell | Addressable and conventional fire alarm systems in buildings and plants |
| Chadwick-Helmuth rotor track and balance | 8500C, 8500C Plus, Vibrex 2000, Model 11, photocell system, printer, bracket, protractor | Helicopter rotor track and balance and propeller balancing |
Gas detection uses two basic approaches. Point detectors such as the Sensepoint XCD measure the gas at one location, with a catalytic or infrared sensor for flammable gas and an electrochemical cell for toxic gas such as H2S. Open path detectors such as the Searchline Excel send an infrared beam across an area up to a few hundred metres long and detect a gas cloud anywhere along it. Infrared sensors cannot be poisoned the way catalytic beads can, which matters on sites with silicones or H2S.
Where Honeywell products are used
In Oman and the GCC, Honeywell gas detectors protect wellheads, gas plants, refineries and tank farms. Elster meters and flow computers measure gas at city gate stations and in industry. Gent systems are installed in commercial buildings, hospitals and hotels, and Chadwick-Helmuth balancers are used by helicopter operators.
Ordering Honeywell products: what we need
Send the part number from the label (for example 02104-N-XSSA or SPXCDASMTXF). For gas detectors, add the gas, range, output and certification. For gas meters, add size (DN), flow range and pressure rating. For Gent equipment, add the panel type and loop protocol.
Facts checked against Honeywell press releases and SEC filings, and published histories of Gent and Chadwick-Helmuth, October 2026.
Browse Honeywell products by category: Fire & Gas Detector, Vibration, Flowmeters, Pressure Instrumentation, Temperature Instrumentation.
FAQ
Questions about the Honeywell SmartLine STD800 Differential Pressure
Answers from our engineering team on installation, compatibility and integration.
01What ranges does the STD800 offer?
Five models cover 10 inH2O (STD810), 100 inH2O (STD815), 400 inH2O (STD820), 100 psi (STD830) and 3,000 psi (STD870) upper range limits, with matching negative lower limits.
02How accurate is the STD800?
Reference accuracy is 0.0325 % of span standard and 0.025 % optional for most models, and 0.035 % for the STD810. Stability is as good as 0.01 % of URL per year for 15 years.
03What is the maximum rangeability of the STD800?
Up to 400:1 on the STD820, with 200:1 on the STD815, STD830 and STD870 and 100:1 on the STD810. Response time is as fast as 90 ms.
04What static pressure can the STD800 withstand?
MAWP is 4,500 psi (310 bar) for STD820, STD830 and STD870, with 6,000 psi optional, 2,500 psi for STD815 and 50 psi for STD810. Overpressure limit equals MAWP.
05Which communication options does the STD800 support?
4 to 20 mA with HART 7 or Honeywell DE, and FOUNDATION Fieldbus. HART and Fieldbus units support NAMUR NE-107 diagnostics and plugged impulse line detection.
Reviews
There are no reviews yet.