Specifications

Dekker Vacuum Technologies, Inc. – DuraVane/12 17
Protective Devices
The following protective devices are available to protect the unit from being damaged and to help with
maintenance.
High Temperature Switch (optional): will signal when the temperature of the oil is exceeding
the recommended level. The switch will shut the unit down. The unit will not restart until the
alarm condition is acknowledged and is reset. The switch is a “snap disc” type of switch that is
normally closed. When the temperature reaches the maximum setpoint, the switch will open.
Once the switch has opened, there is a 10-20
o
F differential that the temperature will need to drop
to, in order for the switch to close.
High Back-pressure Switch (optional): may be installed on the discharge of the rotary vane
vacuum pump. When the back-pressure reaches a pre-determined level, the switch will signal the
control panel. A high back-pressure light may be installed on the control panel, which, when
illuminated, signals that the exhaust element in the vacuum pump needs to be replaced. Note
that the high back-pressure switch will not shut the unit down, but the exhaust element must be
replaced as soon as possible.
Lag Pump On Alarm (optional): An NFPA 99 requirement on medical systems. This is an
audio/visual alarm that signals lag pump operation. Once the alarm triggers, the alarm must be
acknowledged and reset. The alarm will not reset if the lag pump is still in operation. This alarm
indicates vacuum is greater than the supply of the lead pump only.
Transformer Failure Light (optional): All standard medical NFPA 99 rotary vane vacuum pump
systems are supplied with two (2) control voltage transformers (one primary and one for backup).
If indication is desired in the event that the primary transformer fails and the backup transformer
picks up, a TRANSFORMER FAILURE light will be necessary. The defective transformer should
be replaced as soon as possible. When the primary transformer fails, the operation of the system
will not be interrupted. If the backup transformer also fails, the system will shut down.
Low Oil Level Switch (optional): This switch may be installed in the separator/reservoir of the
rotary vane vacuum pump. It is a float type of switch. If the level switch is triggered, the affected
pump will shut down. The LOW OIL LEVEL light on the control panel will be illuminated. The low
level switch will be wired into the main alarm of the panel. The alarm will have to be reset to
restart the pump. When filling the pump with oil, make sure that the power to the pump is
off because if the alarm reset button has been reset and the level switches contacts close
while filling the pump, the pump will start-up automatically.
Frequent Stop/Start Protection (standard on multiplex systems): Allows each pump to run a
minimum amount of time. Frequent stopping/starting can reduce coupling life and is also less
efficient from a power consumption standpoint.
Automatic Alternation (standard on multiplex systems unless otherwise specified): Allows
the pumps to alternate. The primary feature of automatic alternation is to equalize the running
time on all the pumps.