As the name implies, thermal flow meters and controllers use heat to measure the flow rate of a fluid. Thermal technology traditionally work in one of two ways.

Thermal mass flow meters are used to measure mass flow of low gas flow. A thermal mass flow controller is a flow meter combined with a 

Parker Model 201 Thermal Mass Flow Controllers provide reliable analog flow measurements configured for your process conditions. Each controller.

03/11/  · In the case of a 0-5 VDC flow controller, a 5-volt setpoint command is instructing the flow controller to set the flow to 100% of full scale. The relationship between flow rate and command signal is linear, so if you want to control at 25% of full scale, then you would send a 1.25 VDC command signal (0.25 * 5 VDC = 1.25 VDC).

Call 1-888-554-3569 SLA5800 Series Elastomer Sealed Thermal Mass Flow Controllers & Meters Advance and simplify your mass flow control. Models SLA5850 / SLA5851 / SLA5853 / SLA5860 / SLA5861 / SLA5863 Imagine choosing just one mass flow controller platform to handle fourteen different pressure or flow rates going into a single process.

G-Series Fast and Repeatable Mass Flow Controllers G-Series Fast and Repeatable Mass Flow Controllers G-Series Mass Flow Controllers are cost effective thermal flow controllers with fast and repeatable performance that are well suited for most industries and applications. Showing 33 products in 5 families

The Vögtlin product line-up covers thermal mass flow meters and mass flow controllers for gases and the first long-life integrated battery mass flow meter with built-in touch display. Our high-precision devices come equipped with digital and analog interface, IP67/NEMA6 protection and ATEX certification.

Thermal mass flow meters are often used in monitoring or controlling mass-related processes such as chemical reactions that depend on the relative masses of unreacted ingredients. In detecting the mass flow of compressible vapors and gases, the measurement is unaffected by changes in pressure and/or temperature.

The following table lists theoretical gas correction factors for various gases with respect to Nitrogen for thermal-based mass flow controllers. Please note that a non-linearity may exist between a Nitrogen calibration and the actual flow of process gases. Gas. Symbol. Specific Heat, CP cal/g°C.

Since thermal mass flow controllers can measure the mass flow rate of a gas directly, they are not affected by pressure or temperature 

Thermal mass flow sensors are most often used for the regulation of low gas flows. They operate either by introducing a known amount of heat into the flowing 

Thermal mass flow meters, also known as thermal dispersion or immersible mass flow meters, comprise a family of instruments for the measurement of the total 

The basic construction of mass flow controllers consists of four main components. A body, a thermal sensor, a printed circuit board and a magnetic control valve 

As the industry leading supplier, Parker offers liquid and gas, electronic, manual and thermal mass flow controllers (MFCs) for flow rate applications. Parker's line of MFCs includes models for vapor delivery systems, liquid MFC, gas MFCs and variable constant differential flow controllers. 687PDC 687PDC OK Product Comparison

Thermal flow measuring principle This measuring principle is based on the fact that heat is drawn from a heated body when a fluid flows past. A thermal 

Meter: max. 100 mA; Controller: max. 250 mA. Operation pressure. 0.2 – 11 bar (3 – 160 psia) / GSC with valve type 4.5 and 8: max. 8 bara (120 psia) Temperature (environment/gas) 0 – 50°C (32 – 122°F) Body Materials. Anodized aluminum, optional stainless steel electropolished. Seals. FKM, NBR, optional EPDM.