Honeywell SMV800 SmartLine Multivariable Transmitter

SMV800 SmartLine multivariable transmitter: DP, static pressure and temperature in one body

The Honeywell SMV800 is a multivariable process transmitter from the SmartLine family. A single meter body measures differential pressure, static (line) pressure and process temperature, and the electronics then calculate compensated mass or volume flow from those three inputs. In practice that replaces what is normally a DP transmitter, a separate pressure transmitter and a temperature transmitter feeding a flow computer. Seven Star LLC supplies SMV800 transmitters in Oman and the GCC as an independent supplier in Muscat.

SMV800 is a family name, not a single code. The range key in the Honeywell specification picks one of four measuring ranges (SMA810, SMA845, SMG870 or SMG890), which fixes the differential and static pressure limits. The temperature input is chosen separately, as a single RTD input or a single universal input, and the digital protocol is HART 7, Honeywell DE or Modbus RS-485.

SMV800 technical specifications

How the SMV800 produces compensated flow

Inside the SMV800 a piezoresistive differential sensor and a static pressure sensor share the meter body, and an RTD or thermocouple input on the terminal board adds the temperature. The transmitter runs the flow equation itself, as often as twice per second, using either ASME 1989-style algorithms or the Advanced algorithm option. Because density, gas expansion factor and discharge coefficient are recomputed as pressure and temperature move, the flow value stays correct when operating conditions drift, which a fixed-density calculation cannot do.

The Advanced algorithm covers orifice plates (ASME MFC-3M, AGA 3 and ISO 5167), integral and small-bore orifices, nozzles, Venturi tubes, averaging Pitot tubes, V-Cone, wafer cone and wedge elements. A basic flow density compensation mode, where flow factors are typed in by hand, is also available. Mass flow can be configured for gas, liquid and steam, including superheated and saturated steam. The HART and Modbus versions can also totalize flow.

Where the SMV800 fits in a plant system

The SMV800 suits gas, steam and liquid flow points where a flow computer would otherwise be needed: fuel gas headers, steam to turbines and heat exchangers, boiler feed water, and internal allocation lines. Honeywell tests the whole SmartLine family with Experion PKS, and the HART version works with any DCS or asset-management host that uses device descriptions or DTMs. The Modbus version talks directly to flow computers, RTUs, PLCs and SCADA, supports up to 32 devices in multidrop, and draws only about 70 mW at 9.5 V, which makes it well suited to solar-powered installations.

Related SmartLine parts that we also quote include the STT850 and STT700 temperature transmitters for stand-alone temperature points, the SmartLine GWR and NCR level transmitters, and the modular spares (display, communication module, terminal board and meter body) that fit the SMV800 platform.

SMV800 model selection and ordering checklist

• Choose the range key: SMA810 for very low differential (25 inH2O) and up to 100 psia, SMA845 for 400 inH2O and 1500 psia, SMG870 for 400 inH2O and 4500 psig, SMG890 for 2000 inH2O and 4500 psig.
• State the line pressure and the maximum working pressure; the rated working pressures are 100 psia (SMA810), 3000 psia (SMA845) and 4500 psig (SMG870, SMG890).
• Select the temperature input type: single RTD (2, 3 or 4 wire) or single universal input. Types B, N, R and S thermocouples are available only on HART and Modbus versions, and the DE version uses Pt100 only.
• Pick protocol and output: HART 7, DE or Modbus RS-485, with or without integral display and three-button configuration.
• Specify wetted materials: diaphragm (316L, Hastelloy C-276, Monel 400, tantalum, gold-plated variants), process head, bolting and gaskets, and fill fluid (silicone 200, silicone 704, NEOBEE or CTFE).
• Give the hazardous-area approval and SIL requirement, mounting bracket type, and whether lightning protection is wanted.

Installing and commissioning the SMV800

The meter body mounts with the supplied bracket on a 2 inch pipe in nearly any orientation. Run the impulse lines or manifold for the differential connection as for any DP transmitter, keep them short and equal in temperature, and connect the RTD or thermocouple leads to the terminal board; lead resistance is limited to 50 ohms per leg for most sensor types (10 ohms per leg for Pt25). Loop wiring is polarity insensitive, and the display can be rotated in 90 degree steps.

Flow-related parameters are set through the HART DD or DTM tools, the SCT3000 toolkit for DE, or the SmartLine Modbus Manager, while basic zero and span can be done from the three external buttons. Honeywell advises verifying PV1 and PV2 calibration about every four years. The unit reports critical and non-critical diagnostics and offers fixed-current and simulation modes for loop checks. Electronics, display and terminal modules can be replaced in the field without redoing the meter-body characterisation, which keeps spares simple.

Typical SMV800 applications in Oman and the GCC

In Oman and across the Gulf, multivariable transmitters are used where flow accuracy and tag count both matter. Typical examples are fuel gas and flare gas measurement in oil and gas facilities, steam balance on power and desalination plants, feed gas and utility lines in petrochemical sites, and remote wellhead or pipeline stations reporting over Modbus. The -40 to 85 °C ambient rating and IP66/IP67 housing handle desert heat and dust, while stainless or Hastelloy wetted parts are used on sour or corrosive streams.

SMV800 range variants at a glance

Information to send with an SMV800 RFQ

• Full model or range key (SMA810, SMA845, SMG870 or SMG890) and the existing tag or datasheet number.
• Fluid, line size, primary element type, and operating, minimum and maximum flow, pressure and temperature.
• Temperature sensor type and wiring, protocol (HART, DE or Modbus) and host system.
• Wetted materials, fill fluid, hazardous-area approval, SIL need, and any marine or NACE requirement.
• Quantity, delivery site and whether the order is for replacement or new installation.

Documents and quotation

Send the SMV800 range key, protocol and wetted-material needs and we will confirm which documents are available for that exact configuration. Datasheets for the SMV800 are issued by Honeywell as a specification with a model selection guide, so the exact code string matters.

Seven Star LLC is an independent supplier in Muscat and quotes against the part number you supply; please include the full order code when replacing an installed unit.