Inline Thermal Mass Flow Meters with Flow Conditioning

FlatTrak^™ 780S

Reduce straight-run requirements with built-in flow conditioning
Eliminate drift with DrySense sensor
Needs only 3-diameters up, zero downstream
Validate in the field for easy in-situ calibration
Backed by lifetime sensor warranty

Overview

North America's #1 selling inline thermal mass flow meter (2009 Flow Research, Boston MA) delivers precise measurements with heavy-duty industrial gas mass and inline CFM air flow meters. Choose from a wide variety of inline and insertion thermal mass air flow meters for precision CFM (cubic feet per minute) measurement of gas mass flow rate in industrial environments.

Accurate monitoring of peak, low flow and total gas mass flow rates is a critical part of many industrial process control systems. The FlatTrak™ 780S offers improved measurement capabilities in installations where long straight pipe runs are not available. The thermal meter:

Incorporates Sierra’s unique dual-plate flow conditioning element to eliminate velocity profile distortions, as well as swirl and temperature stratification in the gas stream
Reduces piping straight run requirements to as little as three upstream diameters
Saves you money on installation costs when compared to an orifice-plate where at least 20 upstream piping diameters are required for optimal performance

The 780S is GHG certified and routinely used to measure gas to boilers and burners and other process equipment, air volume flow metering, compressed air flow, combustion air flow, natural gas fuel flow, custody transfer and stack gas emissions flow monitoring.Operating Principal: Thermal dispersion technology for direct mass flow measurement featuring no pressure or temperature compensation needed, no moving parts, low pressure drop, high turndown.

Watch the video to learn about Thermal Principle of Operation for thermal mass meters.

Product Benefits

Built-in flow conditioning elements drastically reduce upstream straight-run requirements
Features our no-drift DrySense velocity sensor
Lifetime warranty on sensor
Greenhouse Gas (GHG) certified to meet EPA (40 CFR Part 98)
Optimized (CH4) as well as N20, SF6, HFCs, PFCs and CO2, per the EPA mandate
Popular choice for landfill gas (LFG) measurement at low pressure (20 - 40 mBarg) and about 40-60°C (100°F) variable flows require a large turndown
Custom options available:
- Wide range of process connections
- Wide range of materials like Kynar and Hastalloy
- Self-cleaning purge for dirty flow environments
- Ultra-High Purity 7-10 Ra to 20-25Ra interior finishes

Flow-range adjustment and validation and diagnostics
Dual-range capability
Field validation/configuration to assure operating performance
Field rangeability
Flow totalizer and alarms
Large LCD display and pushbutton interface, remote enclosure mounting available
An insertion version for pipes/ducts up to 72" (2M) available - Model 640S
Very low pressure drop
No moving parts
Free computer interface software
Digital communications: Modbus RTU

Specifications

Accuracy: +/- 1% of reading plus +/-0.5% of full scale
Repeatability of +/- 0.2% of full scale
Pipe sizes from 1.0" to 8.0" (2.5cm to 20.3cm)
Flow range to 20,000 sfpm (100 smps)
Measure all inert gases and all non-condensing clean gases
Flammable gases: methane, propane, hydrogen, digester gas, natural gas
Corrosive gases compatible with 316L stainless steel
100:1 turndown
Temperature:
- Gas: -40°F (-40°C) to 350°F (200°C)
- Ambient: -40° F to 120° F (-40° C to 50° C)
Response time is one second to achieve 63% of final value
Power supply 18 to 30 VDC (regulated), 625 mA maximum; 100 to 240 VAC, 50/60 Hz, 15 watts maximum

View All Specs

316 stainless-steel construction (Other materials available)
Output signals: RS-232, 0–5 VDC, 0-10 VDC, 4–20 mA
User definable pulse output for totalized flow
Digital communications solutions include: Modbus RTU
Hazardous-Area Location Enclosure (IP66) and NEMA 4X (IP65)
Approvals:
- FM (USA) Class I, Div I, Groups B,C,D
- CSA and CRN (Canada)
- ATEX
- CE
- PED (EU)
- GOST R (Russian Federation)
- Chinese Pattern Approval (China)

Documents & Downloads

	File Title	Version	Release Date
Datasheets(2)
	FlatTrak 780S Technical Datasheet	N	06/13/2024
	600/700 Series Application Datasheet	V6	12/11/2016
Manuals(4)
	File Title	Version	Release Date
	FlatTrak 780S Instruction Manual	S	06/13/2024
	640S/780S ATEX Instruction Manual	D	04/21/2022
	S-Series Smart Interface Software User Manual	D	12/21/2022
	S-Series Pulse Output Information Sheet	B	05/08/2013
Software(1)
	File Title	Version	Release Date
	600/700 Series Product Software	SIP134	04/16/2013
Digital Communications - Flow Meter Digicom - Modbus RTU(3)
	File Title	Version	Release Date
	600/700 Series Modbus Instruction Manual	V1.1	05/06/2013
	600/700 Series Modbus Quick Install Guide	47-0493-D	01/06/2023
	KepserverEx 4.0 Software for Use With MODBUS	4.0	05/29/2014
Certificates(21)
	File Title	Version	Release Date
	CSA Certificate of Compliance (640S/780S/780S_UHP)	9.2013	11/10/2023
	FM Certificate - 640S, 780S, & 780S UHP	8.13.24	10/25/2024
	Supplement to CSA Certificate of Compliance (640S/780S/780S_UHP)	9.2013	11/10/2023
	640S/780S Series ATEX Certificate	V3	01/10/2014
	Korean OSHA Certificate	2.0	01/10/2024
	600/700 Series CE Declaration of Conformity	1.0	12/23/2013
	Gost Approval EX Explosive Certificate	1.0	06/23/2014
	Gost Approvals Thermal Mass Flow Meters	1.0	06/23/2014
	640S/780S CE Declaration of Conformity	3.0	12/23/2013
	600/700 S-Series CE Certificate	1.0	03/12/2021
	China Pattern Approval Certificate	01/28/2014
	CRN Approvals Alberta	2019-2029	02/20/2024
	RoHS 3, REACH, and WEEE Compliance	2.0	09/20/2021
	ARRA Certificate of Conformity	11/3/17	11/03/2017
	CRN Approval	2.0	09/20/2019
	CRN Approval Ontario	2.0	09/20/2019
	CRN Approval Quebec	2.0	09/20/2019
	CRN Approval British Columbia	2.0	09/20/2019
	CRN Approval Saskatchewan	2.0	09/19/2019
	CRN Approval Manitoba	2.0	09/20/2019
	ISO 9001:2015	2024	05/14/2024
Additional Documentation(6)
	File Title	Version	Release Date
	Sierra Clean Energy Guide	V1	01/28/2011
	Full Line Catalog - German Version	V1	08/07/2017
	Full Line Product Offering	V4	08/03/2023
	Service Brochure	2.0	04/06/2015
	Warranty Statement	2.0	04/01/2015
	Terms and Conditions	1.0	11/01/2010