Reconciling Multi Tube Dye Liquor Ratios across Mixed Capacity Jets
Reconciling liquor ratios across mixed-capacity jets demands adjusting total liquid for static piping dead volume to maintain absolute chemical concentrations.
Differential Pressure Level Sensor
Measurement Instrument
Industrial pressure transmitters designed to measure the hydrostatic head of a liquid column represent the primary technology for tracking dye bath heights in enclosed textile processing vessels. By comparing the pressure at the bottom of the vessel to the pressure in the headspace above the liquid, a differential pressure level sensor determines the height of the liquid accurately. This configuration operates effectively in both pressurized and atmospheric dyeing machines.
Hydrostatic Principle
Force exerted by the liquid column is transmitted to a sensing diaphragm that converts physical deflection into an electrical signal. This signal varies directly with the density of the dye bath and the height of the liquid. Since dye baths are often heated to high temperatures under pressure, using a differential pressure level sensor isolates the measurement from the vapor pressure generated in the sealed headspace.
The resulting density calculation provides the base measurement for liquid volume tracking.
Process Monitoring
Tracking the liquid level dynamically during fabric processing prevents machine dry runs and nozzle starvation. The sensor output is integrated with the inlet valve controls to allow automatic top-ups when the liquid level falls below the safety threshold. Fabric absorption, steam condensation and chemical dosing continuously change the total volume, and a differential pressure level sensor provides the continuous feedback required to adjust these values.
This continuous monitoring prevents shade variations caused by unintended liquor ratio shifts during the cycle.
Calibration Check
Periodic verification of the transmitter output ensures that temperature shifts do not cause signal drift. Because hot dye baths can affect the differential pressure level sensor, scheduled recalibration keeps the sensor readings aligned with actual physical volumes.