Process Control
January 2023
•
Rev. 0
• Standard Devices User Manual
19
Ramping Options
Ramping options control when ramping occurs. This can be
when the setpoint changes, when the device powers on, or
when setting a zero setpoint.
•
Ramp
Up
can toggle between on and off. When off,
the ramp rate will not be honored when increasing
flow or pressure to reach a given setpoint.
•
Ramp
Down
can toggle between on and off. When off,
the ramp rate will not be honored when decreasing
flow or pressure to reach a given setpoint.
•
Power
Up
toggles between
Allow Ramp
and
No
Ramp
. If set to
No Ramp
, the device ignores the ramp
rate just after powering on, otherwise it honors the
ramp rate starting at a zero setpoint. This functions
the same as
power-up setpoint with ramping
(
). Changing one overwrites the other.
•
0 Setpt
determines if the controller ramps when
a zero setpoint is set. If this setting is set to
No
Ramp
when given a zero setpoint, the controller
immediately moves to the zero setpoint. Otherwise,
the controller ramps at the selected rate.
✓
Note:
Setpoint ramping can be used with flow
or pressure setpoints, depending on the control
loop selected. Ramping for pressure control
limits how quickly pressure changes before
reaching the setpoint. To limit flow rates directly
while controlling pressure, see
.
Batch Dispensing
Flow Controllers
BATCH
or
MENU
→
CONTROL
→
Batch 1
or
Batch 2
Batch dispensing flows a set volume of gas. Once that volume
of gas flows through the controller, the valve closes and flow
stops. You can repeat batches with a single button press.
To utilize batching, at least one totalizer must be enabled.
The
BATCH
button can be found on the totalizer screen
). When selecting from the
CONTROL
menu,
Batch
1
is for totalizer 1 and
Batch 2
is for totalizer 2. Only set one
batch at a time to avoid premature stoppage in flow.
Start a Batch
1.
Choose the total quantity to be dispensed in each batch.
Press
SET
to accept the new batch size.
2.
Once a batch size has been set, give the controller a
setpoint (
). Flow begins as soon as you press
SET
.
✓
Note:
Batch dispensing requires an active batch size
and a non-zero setpoint. If your controller already
has a non-zero setpoint, batching begins as soon
as you press SET from the batch size screen.
While a batch is being dispensed, the remaining quantity of
to be dispensed is displayed about the
RESET
and
BATCH
buttons. When the batch is complete,
–DONE–
displays just
above the
BATCH
button and flow stops automatically. The
setpoint is not cleared and remains the same.
The batch size can be changed while a batch is in progress.
If the new batch size is larger than the current totalized flow,
then flow continues until the new value is reached. If the new
batch size is smaller than the current totalized flow, then the
flow stops immediately. Press
RESET
to start the new batch.
Setpoint Ramping
Setting a maximum ramp rate.
Configuring delta / time ramping.
S
etpoint ramping menu
.
Selecting a batch size of 1000 SL.
Totalizer displaying a mass
flow average without a batch,
with a batch in progress,
and with a finished batch.
