Specifying Flow Conditions for Your Thermal Mass Flowmeter

When providing the details of your flow conditions, you must be sure include certain parameters for the flowmeter to be properly matched to your application. You can use our Request a Quote to specifying the requirements for your process: gas, line size, temperature and pressure, power input, etc. Fill in as much information as available, and print/fax to 831/648-7780 or submit via email for a prompt response.

The category descriptions below will help you specify the proper flowmeter:

• Gas Composition — This is simple if you are flowing air or a pure gas such as hydrogen, nitrogen, etc. Gas mixtures should be provided with each gas listed as a percent of the total, with the sum equalling 100%. Whenever possible, we calibrate your thermal mass flow meter with the actual gas. When this is not possible, we use a gas or gas mixture with equilavent heat transfer characteristics.
  
  
• Full Scale Flow Rate — Although you may not know your exact maximum flow rate (Full Scale), you must provide an estimate for the calibration. If the Full Scale is not known, it is best to over estimate a flow. This information can be in units of mass flow (SCFM, Lbs/Hr, NCMH, etc.) or velocity (SFPM, MPS, etc.).
  
  
• Line Size — Whether you are interested in an in-line or an insertion style thermal mass flowmeter, we need to know your process line size.
  
  
• Process Gas Pressure and Temperature — We calibrate your thermal mass flowmeter under conditions as close to your process environment as possible.
  
  
• Electronics Temperature — This refers to the ambient temperature of the environment surrounding the flowmeter’s electronics. We can provide options for a wide range of conditions.
  
  
• Input Power Requirements — You must specify whether the thermal mass flowmeter will be powered by 24 VDC or 115 VAC (230 VAC optional).
  
  
• Configuration — EPI manufactures both inline and insertion style flowmeters (see Inline and Insertion Style Mass Flowmeters for a description). We can supply inline style flowmeters for line sizes from 1/4" to 4" with a number of installation options such as MNPT ends, ANSI of DIN flanges, etc. Insertion style flowmeters can be used in line sizes of 2" or greater and can be mounted with ball valve retractor assemblies, compression fittings, pipe nipples, etc.
  EPI also manufactures flowmeters with either Integral or Remote Style electronics (see Integral and Remote Style Mass Flowmeters for a description). The integral configuration is generally less expensive, but the remote style allows easy access to the electronics even when the actual process line installation is in an otherwise inconvenient location.