Gas Flow Constant Calibration Worksheet

Follow the instructions for calibrating the analyzer’s Mass Flow Controllers for a given gas. Use worksheet to record measured values and perform calculations included in this process.

Single Gases

MFC being used (optional)

__________ Preparation

__________ Carrier

__________ Analysis (Loop)

Gas: __________________________________________________________________________

  1. MFC flow rate (as set on instrument schematic): __________________________________
  2. Measured flow rate (using an external flow meter): _________________________________
  3. Convert the flow rate to Standard Temperature and Pressure (STP) using the following formula:
Measured rate at STP: _________________________

  1. Enter the value from line 3 in the Actual flow field of the Gas Flow Constant Calibration window (Unit [n] > Gas Flow Calibration).
  2. The new Mass flow constant displays. Enter the Mass flow constant value: __________
  3. Click Accept.
  4. Enter the new Conversion Constant for this gas (from line 5) into the Adsorptive Properties (.ADP) file.

Gas Mixtures

A conversion constant for a mixture of gases can be determined using the conversion constants for each gas in the mixture. Use the following formula to calculate the conversion constant for the gas mixture:

where

M = mixture conversion constant
P = percentage of gas n in the mixture, expressed as a whole number (example: for 15%, use 15, not .15)
F = conversion constant (factor) for gas n
Gas Name (n) Conversion Constant (F)
1.  
2.  
3.  
4.  
5.  
6.  
7.  
8.  
9.  
10.  
11.  
12.  
13.  
14.  
15.  

Mixture name: _______________________        Constant (M): _______________________

 
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