Cleaning Guide

Dispensing Environment

Particulate contamination can block the orifice of the MicroJet dispensing device and interfere with operation. Thus, having a clean operating environment is essential.

Dispenser Handling

The orifice of a MicroJet device is subject to clogging and blockage by particulate material present in the jetting solution. The filtration of the jetting solution prior to use is essential. Before dispensing you should:

MicroJet devices must be cleaned immediately after use to ensure reliable dispensing and extended operational life. Note: The inline filter must be removed from the MJ-AL style devices prior to cleaning.

Clogged Orifice Procedure

An orifice blockage that cannot be removed using the cleaning and back-flushing procedures described above may be removed using the following protocols. Please note that leaving solutions in the device for extended periods of time, such as overnight, can result in orifice clogging.
  1. Immerse the tip of the device and backflush with a 2% solution (80°C) of Micro-90 Cleaning Solution (Cole-Parmer cat. # U-18100-00) in a beaker held in an Ultrasonic cleaner. Avoid the use of high power output Ultrasonic cleaners, as they can damage the fragile orifice. Also, minimize the amount of time the MicroJet device tip is exposed to Ultrasonic cleaning. Check the condition of the orifice after one minute. Repeat if necessary. A cotton swab can be used to wipe the tip of the device during this procedure to help free the clog.
  2. If the orifice remains clogged, immerse the tip of the device in a 5% water solution (80°C) of Micro-90 Cleaning Solution (Cole-Parmer cat. # U-18100-00) for overnight. Then, perform the backflush procedure described in “1” above.
  3. The MJ device can be returned to MicroFab if the cleaning procedures described above fail to unclog the orifice. The device will be cleaned, retested, and returned with a service fee applied. For each returned device fill out and attach the Dispensing Device Return Form (found under Support/Return Forms). Note: A completed form is required for each device returned. Do not combine multiple devices onto one Dispensing Device Return Form.

Precautions

Do not immerse the body of the MicroJet device into the Micro-90 Cleaning Solution or other solvent, as these fluids can damage the epoxy and nickel coating of the PZT. Water and/or IPA can be used to clean the MicroJet casing.
Avoid the use of high power output ultrasonic cleaners, as they can damage the edge of orifice. Also, minimize the amount of time the MicroJet device tip is exposed to ultrasonic cleaning.


Additional Information

Cleaning Guide (PDF)