Agilent 8453 Dissolution Testing System Installing and Operating Manual 107
Using the Valve Unit and Valve-pump Controller 4
Servicing Your Valve System
✔ Check remote operation of the stand alone pump:
1 Connect the valve-pump controller-pump cable because the pump has a
remote/manual switch integrated in the remote plug.
2 Take a piece of wire to short the pins 2 and 3 with pin 1 (GND) or 3 with
pin 1 (GND) (see Table 28).
✔ Check electronics of the valve unit:
1 Open the connector of the valve-pump controller-pump cable which
connects to the valve-pump controller to have access to the pins.
2 Connect the valve-pump controller-pump cable to the valve-pump
controller and the pump.
3 Measure the logic levels given in Table 29, after entering the appropriate
setpoints in your computer.
✔ Check the electronics of the GP-IO port of the spectrophotometer, refer to
“Checking GP-IO Output Signals of the Spectrophotometer” on page 109.
Tab le 28 Controller-Pump Cable (Controller Connector)
Pin 2 Pin 3
CCW Operation Open GND
CW Operation GND GND
Tab le 29 Pump Connector of Controller
Pin 2 Pin 3
Pump off 0 1
CCW operation 1 0
CW operation 0 0
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