18 Pub. No. OM-A-10H REV. 7 — June 2006
OPTIONS LISTING WITH EXPLANATION (PH & EH MODELS ONLY)
AUDIBLE ALARM
The Audible Alarm consists of a buzzer with reset push
button and ON/OFF selector switch.
The audible alarm provides an audible warning to alert
an operator that the dryer is not functioning properly. This
option is used with options such as “Failure to Shift Alarm”
or “High Humidity Alarm.”
FAILURE TO SHIFT ALARM
The Failure to Shift Alarm consists of an alarm light that
illuminates if the desiccant towers fail to shift at a
prescribed time. Dry contacts are provided for remote
annunciation.
HIGH HUMIDITY ALARM
The High Humidity Alarm consists of an alarm light
controlled by a hygrometer that senses the dewpoint at the
outlet of the air dryer. This alarm illuminates when the
dewpoint reaches -20°F and above. A small amount of
sample air is required for operation. Dry contacts are
provided for remote annunciation.
Calibration: To maintain accuracy, replace the probe
every two years.
Probe Replacement: Turn the normal/demand selector
switch to the normal position. This will disable the contacts
for Dewpoint Demand. Isolate and depressurize the probe
chamber. Replace the probe. Pressurize the probe
chamber and turn the power back on.
MOISTURE INDICATOR
(All types of regenerative dryers)
The moisture indicator consists of a small, clear,
polycarbonate filter filled with a color change silica gel. It
is located at the outlet of the dryer. When the dewpoint is
below -10°F, the desiccant is blue. When the dewpoint is
above -10°F, the desiccant is pink. A small amount of
sample air is required for operation.
FIGURE 7 — MOISTURE INDICATOR
PANEL LIGHTS
The Panel Light option consists of four lights: Left Tower
Drying, Right Tower Drying, Left Tower Regenerating, and
Right Tower Regenerating. These lights are for dryer
sequence indication.
PLC CONTROLLER
PLC Controller can be added to control the operation of
standard regenerative dryers. Typically Square D or Allen
Bradley PLCs are used.
DEWPOINT DEMAND CONTROL “DPD”
The Dewpoint Demand control is an energy saver that can
extend the drying cycle without purging, during periods of
lower moisture loads. The Dewpoint Demand system
offers, in one compact package, the utmost in flexibility
and accuracy sensing the actual dewpoint of the outlet air.
The hygrometer senses the dewpoint at the outlet of the
dryer at the end of the drying cycle, and extends the
drying cycle until the preset adjustable dewpoint setpoint
is reached. During this extended drying cycle, the purge
valves are closed and the opposite tower is pressurized
and prepared for the drying cycle. The dewpoint demand
option reduces purge loss and extends valve life. This
option consists of the following:
• Digital Dewpoint Display
• Adjustable Setpoints
• Demand Cycle Light
• High Humidity Alarm Light with Dry Contact
• 4-20mA Output
Calibration: To maintain accuracy, the probe should be
recalibrated annually. Recalibrated probes are
available through your local distributor.
Probe Replacement: Isolate and depressurize the
probe chamber. Disconnect the sensor cable from the
sensor. Remove, and replace the probe. Pressurize the
probe chamber and connect the sensor cable. A small
amount of sample air (approximately 2-10 SCFH) should
expel out the chamber needle valve.
FILTER
HOUSING
SILICA GEL
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