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The ERROR state must be explicitly cleared by sending the "C" command and subsequently
confirming the state with "s".
Below is a diagram showing where the pressure target errors come into force for systems with
positive and negative supply pressures.
These error codes meanings stay the same regardless of supply pressure. Applications can read
the current minimum and maximum target pressures using the "m" command.
The X axis is the gauge pressure in bar increasing to the right.
7 Flow Control
With the later model P-Pump's equipped with the connected Sensor Display (or sensor interface),
the P-Pump can also be run using flow control rather than pressure control. The commands to
control this are shown in section 6.2 above. Note that all flows sent to or received from the P-
Pump are in units of picolitres/second. To convert to µl/minute, multiply by 0.00006.
To move to flow control, you can either simply set a flow target ("Fxxxx" command) or establish
the flow you need by setting an appropriate pressure, then move to flow control using the "X1"
command, which will give a "bumpless" transfer to flow control. To stop flow control, you must
issue "P0" to vent the chamber as "F0", that is zero flow, may well be a perfectly reasonable
setting in some multi-pump systems and may not equate to zero pressure.
To return to pressure control from flow control, use "Pxxx" or, for bumpless transfer, "X0".
7.1 Types of Flow Sensor
This is an enumeration used to identify flow Sensors. 0 implies no flow sensor is connected.
Type
0
number
Part
-
3200100
number
Range
none
0.07-1.5
(water)
Flow
µl/min / x.xxx
sensor
µl/min / -x.xx
units/ dp
calibration
pre-divisor
Note when using a vacuum pump to provide a negative pressure supply, it is possible to control
flow "backwards", that is the negative version the flow rates above are possible. However
different flow sensors have different accuracies for positive and negative flow rates as can be
3600051 - P-Pump API - programming instructions - v 1.3
1
2
3200099
0.4-7µl/min
µl/min
µl/min / x.xx
or
or
µl/min / -x.xx
1
1
3
4
3200098
3200097
1-50µl/min
30-1000
µl/min
µl/min / xx.x
µl/min / xxxx
or
or
µl/min / -xx.x
µl/min / -xxx
100
2
5
3200096
200-5000
µl/min
ml/min / x.xx
or
ml/min / -x.xx
1
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