The Full Scale (FS) Range and Gas on a Mass Flow Controller (MFC) directly correlates to the transmitted output (analog or digital) of the device. In an analog device, the maximum output value (such as 5 vdc or 20 mA) will be equivalent to the FS value. The accuracy of most MFCs is a function of this FS Range.
This is a re-post of an article authored by Dr. Doug Baker of Teledyne Hastings Instruments, posted November 2, 2020.
Thermal mass flow instruments provide an easy way to quickly and accurately measure gas flow. And in some cases, a mass flow instrument may be calibrated for one gas, but then you may want to use the instrument in another gas. This article will discuss how to use GCFs (Gas Conversion Factors) when using flow instruments with different gases.
Before we get into GCFs, let’s quickly review the operation of an electronic thermal mass flow sensor. Below is a diagram of the Teledyne Hastings 200 Series flow sensor. Gas flows through a capillary tube which is heated in the middle to a temperature of approximately 130°C. Two thermocouples, one upstream (TC-1) and one downstream (TC-2), measure the temperature. The temperature difference between the two thermocouples
The THCD-401 provides both ±15 VDC or 24 VDC to power Teledyne Hastings' mass flow controllers, flow meters, vacuum gauges and pressure transducers. Feedback from connected devices is displayed on the bright, front panel LED display in 6-digit resolution, making open and closed channels easily identified at a glance. The THCD-401 can set a relay point for control of other processes and has a high accuracy of ± (0.02% of Reading + 0.01% of Full Scale). Custom configuring products to customer needs is Teledyne's specialty. Your THCD-401 can be factory configured to match the gas, range, units and the output of your instruments for out-of-box functionality.
The THCD-401 was designed to be a highly flexible and multi-featured process display controller that can be panel mounted and capable of interfacing to an assortment of meters, controllers and gauges. A powerful
Teledyne Hastings designs and build mass flow controllers for a broad array of markets from clean laboratory environments to heavy industrial installations. Recently, they have been asked to provide their newest line of Digital 300 Flow Meters and Controllers into more demanding environments. And, they are now proud to offer an optional IP-67 enclosure, which provides protection against dust and water.
First, let’s explore the IP, or Ingress Protection, rating system. NEMA (National Electrical Manufacturers Association) publishes a standard (ANSI/IEC
[ Posted 2020-10]
Introducing the newest generation of mass flow meters and controllers.
[Posted 2020-12]
Certified LabView driver for the 300VUE can now be downloaded at no charge from the National Instruments (NI) website here. LabView is a visual program language that allows users to develop control/monitoring software. Our new drivers allow programmers to quickly integrate our products into their systems. And, since
