Alicat MC Series Mass Flow Controller - Manual (Page 44)

44
BATCH PROCESSING MODE – CONTROLLERS ONLY
Batch mode is a function within the optional Totalizing mode. Batch mode is
designed to provide repeatable, finite flow quantities.
To activate Batch Mode: Press BATCH. Then use
SELECT DIGIT to move the arrow to the desired digit,
and the UP and DOWN buttons to change the value.
Press CLEAR to return to zero. Press SET to record
your value. If the controller has a non-zero Set-Point,
flow will start immediately. If not, press SETPT to
select a Set-Point.
Batch values can also be established via RS-232/RS-485
communication using Register 92. (See RS-232/RS-485
Section of this manual for serial communication methods.)
Note: While the Totalizer counter will still reset across
power cycles, the Batch process value is stored in EEPROM and will remain valid
until updated by the user.
While the Batch is processing, the desired Batch value is displayed above the
totalizing counter on the Totalizer screen. Time elapsed during the Batch
processing is displayed below the totalizing counter. Press TOTAL/TIMER to
toggle these values.
When the active Totalizer reaches the preset Batch value, flow ceases, and the
display updates to “Batch Done”. The Totalizer timer also pauses.
- To start a new batch of the same size, simply press
RESET. The Totalizer can reproduce any number of
fixed Batches in this manner.
- To start a smaller batch, decrease the Batch value.
The new batch begins when you press RESET.
- To continue the existing batch to a larger total
volume, increase the Batch value. Flow resumes as
soon as you press OK in the Batch Value screen.
- To start a larger batch from scratch, first clear the
flow Set-Point to zero to prevent unwanted flow.
Then increase the Batch value, and select a flow Set-Point. Flow will begin when
you press SET in the Set-Point screen.
- To cancel a batch in progress, clear the Set-Point and press SET.
Note: Batch mode operates independently of the desired flow rate, but requires
a non-zero flow rate to run. The rate of flow is determined by the controller
Set-Point value, which is established by the user via analog, front panel or serial
communication methods. Batches can be produced more slowly or more rapidly
as determined by the user-selected Set-Point flow rate.
To turn off Batch Mode: Set the Batch value to zero (0.0) via the front panel or
RS-232/RS-485 communication using Register 92. If there is a non-zero flow Set-
Point, flow will immediately resume, and the Totalizer counter will continue per
the user established Set-Point flow rate.
DOWN
SET
SELECT
DIGIT
UP
BACK
/
CANCEL CLEAR
˄
00123.45
SETPT
123.4
MENU
SCCM
+123.4
TOTAL/
TIMER
BATCH RESET
0000:09:59 SCC
00123.45 Batch Done
00123.45