What is the Viscosity Monitoring System (VMS) on the CM750?

This article explains how the CM750 tracks ink viscosity, what causes viscosity faults, and how to reset and maintain the system.

Why viscosity matters

Viscosity is the thickness of your ink. If it’s too thick, the stream breaks up. Too thin, and print smears or oversprays. The VMS automatically adjusts this by adding solvent.

How the VMS works

• Monitors ink pressure and flow rate

• Triggers makeup addition when viscosity drifts

• Uses timed cycles (Viscosity Timer) to maintain stability

How to interpret VMS status

• Viscosity OK = printer running normally

• Viscosity Error = stream is unstable; adjustment failed

• VMS Timeout = solvent not added in time or sensor error

Fixing viscosity issues

1. Check solvent levels

2. Confirm solvent compatibility (Needham fluids only)

3. Restart the printer to trigger a recalibration

4. If issue persists, run Clean Ink System

Pro tips

• Don't ignore solvent low warnings—they directly impact viscosity

• Use printers regularly; idle ink thickens

• Replace filters if viscosity faults become frequent