Humidity Measurement in Dyeing and Discharge Processes

Introduction

There are various methods for continuous fabric dyeing as well as dye fixing. When dye is directly applied, steaming (heat treatment) is required. At present the pad-steam method is widely used for continuous dyeing. To ensure stable product quality, the humidity in the steamer is kept at a constant level.
The ZR802G Zirconia High Temperature Humidity Analyzer provides excellent maintainability as it does not require the use of a sampling system, and ensures stable measurement in high temperature environments. It has been well received in the marketplace and is widely used in humidity control applications.

Expected Benefits

• Maintains the quality of the discharge process
• Ensures stable, continuous humidity measurement
• Reduces operating costs

Process Overview

The pad-steam dyeing process uses vat, reactive, acid, disperse, and other types of dyes, and includes padding, drying, fixing, washing, and re-drying steps. After padding, the fabrics are forwarded to a steamer where the dye is fixed under conditions of constant temperature and humidity.

Humidity Measurement in a Steamer

Solution Details

Field Data

Process conditions

Measurement point	Steamer side
Sample gas component	Steam: 90 to 100%; air: remaining
Temperature	70 to 110°C
Pressure	10 to 30 kPa
Dust	None

Measurement system

Detector	ZR22G-☐☐☐-S-H-C-R-☐-E-A /SV
Converter	ZR802G-☐-☐-N-N /□
Auto Calibration Unit	ZR40H-☐-☐-A
Zero gas Cylinder	G7001ZC
Pressure Regulator for Gas Cylinder	G7013XF
Air Set	G7003XF

Utilities

Rated voltage	100 to 240 V AC
Rated frequency	50/60 Hz
Power consumption	330 VA (Max. 800 VA)

Notes•
It is best to install the detector vertically with the probe head pointing downward, but it can also be installed at any angle between 0° and 90° (horizontal installation shown right) with respect to the vertical.