User guide

Height Sensor 10-1
10 Height Sensor
Asymtek offers a Retractable Adjustable Height Sensor for Century Series dispensing systems.
Overview
The HS-Series Height Sensor is located on the Dispensing Head next to the needle or nozzle. It checks
and gauges substrate height to help maintain consistent dispensing height on a non-level or warped
substrate. Consistent dispensing height is essential to ensure consistent dispensing quality.
If your system includes this option, it was installed at the Asymtek factory prior to shipping. However, if
you have upgraded to include a Height Sensor, or need to reinstall it, see the installation section below.
Theory of Operation
The HS-Series RT Height Sensor uses a stainless steel probe to contact the dispensing surface. The probe
tip is machined to minimize surface contact. Approximately 5 grams (0.18 oz) of contact force is exerted
during a substrate height measurement. The low force eliminates substrate flex and vibration caused by
probing, and reduces placement inaccuracy and damage to delicate substrates.
When the Dispensing Head lowers and the probe tip contacts the substrate, it triggers an I/O in the Height
Sensor. The Height Sensor sends the substrate height information to the FmNT software.
Operation
Setup selections in Fluidmove for Windows NT (FmNT) control Height Sensor operation. You can also
insert additional height sense commands directly into dispensing programs.
When not taking a height sense measurement, the HS-Series RT Height Sensor probe remains in the
retracted position to prevent it from interfering with the dispensing process.
Height Sensor Setup
If your dispensing system is equipped with a DP-3000 Series Pump, see the DP-3000 Linear Dispensing
Pump Installation and Operation Manual for Height Sensor installation instructions.
HS-Series Height Sensor
See Figure 10-2 for part locations.
Tools and Materials Needed
• HS-Series Height Sensor
• Philips head screwdriver
CAUTION! Only an Asymtek service technician should perform this procedure.