Next Advance SP1800 - 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