Troubleshooting

Dispensing does not start and device does not move#

First check that the device is powered. You should see a blue LED flashing like a heartbeat on the arm. If the LED is not flashing please check the power supply.

Next check the communications to the device. Check that the connectors are fully inserted. If you are using a USB to Serial adaptor please check that the COM port mapping is correct and that you have selected the correct COM port from your browser.

If you need assistance please contact us.

Fluid leak at the valve head#

Fluid leaks at the valve head can be caused by a missing o-ring in the inlet adapter or a tube loose nut. Both situations are easily resolved as follows :-

Fluid leak due to missing o-ring#

When removing a valve it is sometimes possible that a seal o-ring can be pulled out of the inlet adapter. This means that when the valve is replaced there is no seal in place in the fluid line. We recommend that whenever you remove a valve you should always remove the inlet adapter also and confirm that the o-ring is well seated.

Fluid leak due to loose tube nut#

Although you should not over tighten the tube nut as it could restrict fluid flow, it must be tight enough to allow the ferrule to seal correctly against the tube and inlet adapter. The tube nut will never become loose during normal usage of the dispenser, however it can become loose during shipping or if the tube is twisted excessively during the process of filling the fluid supply bottles.

Dispense accuracy and/or precision are not as good as expected#

If you are seeing CV% values that are not has good as they should be then you might have an air leak. Sometimes old glass bottles can have chips around the part that should seal against the bottle cap. The air leak will cause interference and fast pressure fluctuations that can impair dispense accuracy and precision. Also check all the air lines and any blind plug in the bottle cap to ensure they are tightended correctly so that there are no leaks. Check the pressure regulator gauge, if it is oscillating and unstable then the compressed air supply could be very unstable/noisy. In this case it could be beneficial to fit an air ballast tank downstream of the D2’s pressure regulator. This will ensure the D2 sees a very stable pressure.

Note that the precision regulator supplied with the D2 has an exhaust port on the underside that will vent excess air pressure, this is by design and is not a leak.

My browser cannot see the COM port for communications to the dispenser#

Try to restart your browser and/or restart your PC.

A droplet forms on the valve nozzle/outlet and so the fluid is not dispensed correctly#

This can occur if the selected dispense pressure is too low for the fluid type (it’s surface tension, cohesion, viscosity etc) or could be a blocked valve. If you find that you need to increase the pressure then make sure you select the correct calibration for the chosen dispense pressure value from the calibration library, or if required you can run generate a new calibration for your fluid type and new dispense pressure.