Next Advance SP1800 User Manual
Page 33
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SP1600/1800 Programmable Syringe Pump
Publication #1200-02
28
9/15/04
Phase
Function
Rate
Volume
Direction
13
RATE
900.0 ml/hr
17.25 ml
Withdraw
Phase
Function
14
BEEP
Phase
Function
15
PS:00
Phase
Function
16
LP:EN
8.4.5 Example 5: Control from a High-Low Pressure Sensor
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 (PH:01), and when high, the high pressure point is
selected (PH:05). The Program begins by infusing continuously at 10.0 ml/hr (PH:02), while a
background trap is set for the low pressure point (PH: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 (PH:02, 06) before the background traps are set.
When the low pressure trap is triggered, the pump sets the high pressure trap (PH: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
(PH: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 (PH:11). When the high pressure point is reached, the pump
immediately will drop down to 10.0 ml/hr (PH:02), and once again wait for the low pressure point.
Phase
Function
1
OUT.0
Phase
Function
Rate
Volume
Direction
2
RATE
10.0 ml/hr
0.005
Infuse
Phase
Function
3
EV:05
Phase
Function
Rate
Volume
Direction
4
RATE
10.0 ml/hr
0.0 ml (off)
Infuse
Phase
Function
5
OUT.1
Phase
Function
Rate
Volume
Direction
6
RATE
10.0 ml/hr
0.005
Infuse