Model 2000 Flow Computer Instruction Manual
2.0 GENERAL DESCRIPTION
Model 2000 issue 21 Page No
21
All three alarms are logical inputs (with the exception of the piston displacement alarming with can possibly be a counter
input), and are optional.
Piston displacement alarming
The lubrication system provides a feedback signal when lubrication oil is displaced. The lubrication oil displacement will lift a
floating support at each stroke of the lubrication piston. Lifting this floating support is detected by a reed-switch sensor
assembly inside the lubrication system (one pulse at each piston stroke). If there is no lubrication oil in the system or the
piston operation fails the reed-switch will not be activated. The Model 2000 can compare the number of output pulses with
the number of pulses received from the displacement reed-switch sensor. A Piston displacement alarm can be activated
(and optionally be latched) at a programmable limit if this comparison fails.
Lubrication oil level alarming
The oil reservoir of the lubrication system is equipped with a level switch. At a defined minimum level the switch will be
activated. The Model 2000 can signal (and optionally latch) a Lubrication Oil Level Alarm when this minimum level switch is
activated.
Lubrication vent alarming
The lubrication system requires a pressure regulator to control (and limit) the pressure used for the lubrication piston. If the
pressure regulator fails a maximum pressure safety release valve will be operated and the control pressure will be vented to
atmospheric. In the output of the safety release valve a floating piston reed-switch sensor will be operated at sufficient (vent)
flow rates. The Model 2000 can signal (and optionally latch) a Lubrication Vent Alarm if the pressure safety release valve is
activated. This alarm can be delayed to activate only if the reed-switch sensor is operated for X consecutive seconds.
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