Next Advance SP2200 User Manual
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SP2200Programmable Syringe
Pump
Publication #1200-02
22
04/29/10
7.4.5 Example 5: Control from a High-Low Pressure Sensor
10
25
m
l/h
r
Pumping
Rate
Program
Output Pin
Event Input
Pin
Pressure high sensor
Pressure low sensor
Pressure trigger points
This example demonstrates a Pumping Program whose control depends on an external sensor. Assuming a
pressure sensor that is configured to detect a high pressure point and a low pressure point, the Pumping
Program individually selects whether it will react to the high or low pressure point.
The “Program Output” pin on the TTL I/O connector (pin 5) is used to select the high or low pressure point.
When low, the low pressure point is selected (PHASE 01), and when high, the high pressure point is selected
(PHASE 05). The Program begins by infusing continuously at 10.0 ml/hr (PHASE 02), while a background
trap is set for the low pressure point (PHASE 03). To create a delay when the pressure sensor is switched from
high pressure to low pressure when the “Program Output” pin is set, a small volume is pumped (PHASE 02,
06) before the background traps are set.
When the low pressure trap is triggered, the pump sets the high pressure trap (PHASE 07) and begins to
increment the flow rate. The flow rate is incremented in 1.0 ml/hr steps with every 0.25 ml dispensed (PHASE
08-10). If the high pressure trap hasn’t as yet been triggered, the flow rate will max out at 25.0 ml/hr while
waiting for the high pressure trap (PHASE 11). When the high pressure point is reached, the pump
immediately will drop down to 10.0 ml/hr (PHASE 02), and once again wait for the low pressure point.
Phase
Function
1
OUT 0
Phase
Function
Rate
Volume
Direction
2
RAT
10.0 ml/hr
0.005
Infuse
Phase
Function
3
EVN 05
Phase
Function
Rate
Volume
Direction
4
RAT
10.0 ml/hr
0.0 ml (off)
Infuse
Phase
Function
5
OUT 1
Phase
Function
Rate
Volume
Direction
6
RAT
10.0 ml/hr
0.005
Infuse
Phase
Function
7
EVN 01
Phase
Function
8
LPS
Phase
Function
Rate
Volume
Direction
9
INC
1.0
0.25 ml
Infuse