Alemite Carbon Shield, Installation, Operation And Maintenance Manual

Page: 15 / 58

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ALEMITE CARbON SHIELD SERvICE SHEET | 13
Air Heater Package
(optional)
Once air passes through the 5 micron filter, it is
desirable that the air be temperature controlled
before reaching the mist head assembly. An
optional air heater package can be installed to
maintain air temperature at 100 degrees F (37.8
degrees C). Cycling of the air heater–for control
of temperature–is achieved by the PLC with input
from a thermocouple mounted in the air piping
at the air heater outlet. (Fig. 15)
two sizes of air heaters are available.
• Consoles equipped with 1.0 SCFM, 2.3 SCFM
and 4.3 SCFM mist heads require a 500 watt
air heater.
• Mist head capacities of 9.7 SCFM, 13 SCFM
and 21 SCFM require a 1000 watt air heater.
Heater housings meet NEMA 4/7 specifications.
Air heater packages are set to maintain air
temperature at 100 degrees F (37.8 degrees C).
(Fig. 13) and are available for either 120 vAC or 240
vAC to match the incoming line voltage.
Air system
Air
Heater
Temperature
gauge
Thermocouple
Fig. 15
Transducer-booster Assembly
The Carbon Shield
™
console uses electronic closed
loop feedback between a pressure transducer
and pneumatic booster (Fig. 14) to sense and
adjust mist pressure. No incoming air regulator
adjustments are necessary after the initial manual
setting of 70-95 psi (4.92-6.68 kg/cm
2
). The
transducer/booster unit maintains optimum mist
pressure (nominally 20 inches of water column) by
regulating air pressure at the mist head inlet based
on signals it receives from the PLC.
The HMI provides operators with a visual indication
of the mist pressure. Also, air & mist pressure
gauges are available in the cabinet. (Fig. 8 & Fig.14)
oil systems
Oil Inlet
(Manual or Optional Automatic Refill)
Manual oil refill is done through a loader fitting
on the front of the mist head. (Fig. 10)
For automatic refill the oil inlet line from the bulk
storage system connects directly to a ¾ inch NPT
inlet to the 10 micron filter assembly. Filtered oil
enters the reservoir of the main generator when
the 120/240 vAC solenoid valve is energized by the
PLC in response to a low oil level signal from the
level sensor (Fig. 11). The current “usefull” amount
of oil in the main reservoir is displayed through the
Parameter valves screen in the HMI. In addition,
sight glass provides operators a visual indication
of the resulting oil level. (Fig. 16)
Damage to equipment can occur if ordinary
plant/shop air is used.
Use filtered and instrument-quality air only.
Fig. 16