3-5
Brooks
®
Models 0152/0154
Section 3 Operation
Installation and Operation Manual
X-SE-0152-0154-eng
Part Number: 541C052AAG
March, 2008
be active. All setpoints of the slave channel(s) remain as before power
down, except the setpoint of the master channel(s). The
setpoint of the master channel is determined in the “Start-up preferrence”
menu which is explained in 3.9.6.
After confirmation of the required blending configuration, the following is
displayed on the screen:
The slave channels are controlled by the flow of the master channel
determined by the blending ratio. The blending ratio is determined as:
Flow (or pressure)
slave
Blending ratio =
Flow (or pressure)
master
The blending ratio cannot be entered directly , but must be entered via the
setpoint at the slave channel. The setpoint to be entered is as follows:
Setpoint
slave
= Blending ratio x Full Scale Value
master
NOTE:
The flow of the slave channel is determined by the flow of the master
channel and therefore the setpoint value of the slave may not correspond
with the current flow or pressure at the slave channel. In Blending mode, the
slave setpoint is only used for entering the blending ratio
Please note that the choice of the instruments is important to give proper
blending. Always choose instruments with Full Scale Values that meet the
blending ratio as close as possible. For eg. blending ratio 1:10 choose eg.
10 l/min and 1 l/min instruments in order to use the maximum possible
accuracy of the connected instruments.
Also take care that the Full Scale Value of the slave is suitable for the Full
Scale Value of the master. For a 10 l /min master and a blending ratio of 5,
the slave channel must have a full scale value of at least 2 l/min.
If planning to use blending mode with engineering units rather than % full
scale, 1-5 Vdc or 4-20 mA I/O cannot be used.
After confirmation of B0, the blending function will be disabled.
For blending examples see Appendix B.
