DriSteem XT-10 - Principle of Operation

Page 44 • DRI-STEEM XT Series Electrode Steam Humidifier Installation, Operation, and Maintenance Manual
Operation
Principle of operation
When the relative humidity level in the space being humidified
drops below set point, the microprocessor controller in the XT
Series humidifier receives a call for humidity and calculates a
corresponding amperage value. The controller closes the contactor,
which energizes the electrodes. If there is no water or not enough
water in the steam cylinder, the fill valve opens and water enters the
steam cylinder.
As soon as water rises to touch the electrodes, current flows
through the conductive water from one electrode to another. The
conductive water provides resistance to current flow, producing
heat, and causing water in the steam cylinder to boil and produce
OM-7376
Figure 44-1:
XT Series principle of operation
Fill cup
Overflow prevents
humidifier from over filling
Fill
Overflow
drain
Cylinder drain
Operating water level varies with
changes in demand for humidity and
changes in water conductivity.
Electrode.
Electric current flows between
electrodes, heating water into steam.
High water sensor.
The humidifier stops filling if
water reaches this sensor.
Steam outlet
Steam travels through vapor
hose, tubing, or pipe to the
dispersion assembly.
Fill
Fill
Fill
Fill
Fill
Overflow
Replaceable steam cylinder
See the field piping
overview illustration on
Pages 8-9 for fill and drain
connection details.
Cutaway of steam cylinder
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XT_IOM_Jan_2008.pdf 46 11/19/2009 10:13:40 AM