11
2. Green LED does not come on even though the humidity level
inside the chamber is known to be at least several percent
above the fixed set point of the Model 5311. Return unit to
factory.
3. Obviously incorrect humidity control – If sensor was removed
from its connector, check to see that it has been replaced
properly. The arrow (
5
) should line up with the left hand side of
the sensor with the sensing grill facing up. If it was reversed,
reinstall properly. The sensor will not be damaged if plugged in
backwards.
Next, if the ambient humidity is near the fixed set point, check
sensor operation by blowing gently onto sensor for several
seconds and observe the Green LED. If the LED turns on, the
humidity sensor and control electronics are working.
4. No dry gas flow, Green LED remains on constantly – Check to
see if there is dry gas at the source. If so, the valve may be
contaminated preventing it from opening or closing. Return the
unit to the factory for replacement.
5. Difficulty maintaining low humidity within the chamber – The
chamber may either be leaking, ambient humidity may be very
high or the flow rate is too low. Generally, with a dry gas system
the humidity within the chamber should recover and stabilize
within a few minutes. If this is not happening, try increasing the
flow rate. Also, check to ensure that dry gas is being injected. If
dry air is being used, there may be condensation in the line.
3.1.7 Specifications
Sensor type:
Temp compensated, capacitive film
Range:
Fixed point, 5%RH, standard
Accuracy:
±
3% RH
Lo/Hi band:
4% RH off / 7% RH on
Set pt adjust:
None
Manual control:
None
Control Out:
12VDC,
Solenoid Valve
Power req.:
90-260 VAC, 50/60Hz, 30W max
Gas In/Out:
¼” Quick Disconnect
3.2 Package
E
Package E is for those applications that require the accurate
measurement and control of relative humidity at various set points below
ambient for long-term applications in a seal environment. The Model 5112
Dehumidifier Controller is used to control dehumidification in the Model
5506 Chamber to any user selectable set point up to 55% RH. The
