Brooks Instrument 0254 - Manual (Page 77)

B-1
Model 0254
Appendix B Blending Examples Installation and Operation Manual
X-SE-0254-eng
Part Number: 541B129AAG
September, 2010
B-1 Blending Examples
Example 4:
Master channel flow is 100%
Slave channel flow has to be 50% (of slave channel full
scale)
Mass flow controller selections are :
Master channel unit: 6 l/min = 100% Full Scale
Slave channel unit: 4 l/min = 100% Full Scale
Blending ratio is = 50%
NOTE: When the blend ratio is % of slave channel, use
100% as the full scale setting for master and slave.
Example 5:
Master channel flow is 80%
Slave channel flow has to be 20 kg/hr
Mass flow controller selections are :
Master channel unit: 100 kg/hr =100% Full Scale
Slave channel unit: 50kg/hr = Full Scale Value
Determination of entered setpoint:
20 kg/h
Blending ratio is = = 0.25 = 25%
80%
kg/h
Setpoint
slave
= 0.25 x 100% = 25 kg/h
%
Example 6:
Master channel pressure is 10 bar
Slave channel flow has to be 50% (of master channel full
scale)
Mass flow controller selections are :
Master channel unit: 15 bar = Full Scale Value
Slave channel unit: 20 l/min = Full Scale Value
Blending ratio is = 50%
Example 1:
Master channel flow is 80 l/min
Slave channel flow has to be 0.8 l/min
Mass flow controller selecions are :
Master channel unit: 100 l/min = Full Scale Value
Slave channel unit: 10 l/min = Full Scale Value
0.8 l/min
Blending ratio is = = 0.01 = 1%
80 l/min
Example 2:
Master channel flow is 240 l/min
Slave channel flow has to be 40 l/min
Mass flow controller selections are :
Master channel unit: 300 l/min = Full Scale Value
Slave channel unit: 50 l/min = Full Scale Value
40 l/min
Blending ratio is = = 0.167 = 16.7%
240 l/min
Example 3:
Master channel pressure is 1000 mbar
Slave channel flow has to be 50 l/min
Mass flow and pressure controller selections are :
Master channel unit: 2000 mbar = Full Scale Value
Slave channel unit: 100 l/min = Full Scale Value
50 l/min
Blending ratio is = = 0.05 = 5%
1000 mbar