B-1
Brooks
®
Models 0152/0154
Appendix B Blending Examples
Installation and Operation Manual
X-SE-0152-0154-eng
Part Number: 541C052AAG
March, 2008
B-1 Blending Examples
Example 4:
Master channel flow is 100%
Slave channel flow has to be 50%
Mass flow controller selections are :
Master channel unit: 6 l/min = 100% Full Scale
Slave channel unit: 4 l/min = 100% Full Scale
Determination of entered setpoint:
50 %
Blending ratio is = = 0.5
100 %
Setpoint
slave
= 0.5 x 100% = 50%
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 kg/h
Blending ratio is = = 0.25
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%
Mass flow controller selections are :
Master channel unit: 15 bar = Full Scale Value
Slave channel unit: 20 l/min = 100% Full Scale
Determination of entered setpoint:
50% %
Blending ratio is = = 5
10 bar bar
%
Setpoint
slave
= 5 x 15 bar = 75%
bar
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
Determination of entered setpoint:
0.8 l/min
Blending ratio is = = 0.01
80 l/min
Setpoint
slave
= 0.01 x 100 l/min = 1 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
Determination of entered setpoint:
40 l/min
Blending ratio is = = 0.167
240 l/min
Setpoint
slave
= 0.167 x 300 l/min = 50 l/min
Example 3:
Master channel pressure is 1 bar
Slave channel flow has to be 50 l/min
Mass flow and pressure controller selections are :
Master channel unit: 2 bar = Full Scale Value
Slave channel unit: 100 l/min = Full Scale Value
Determination of entered setpoint:
50 l/min l/min
Blending ratio is = = 50
1 bar bar
l/min
Setpoint
slave
= 50 x 2 bar = 100 l/min
bar
