Page 27 of 35
Metering Pumps
Operating and Maintenance Instructions
www.empirepumps.com
injections to be yet delivered is shown in dynamic mode. The choice of factor 4 is an easy way to prevent
any transient phenomena generating false alarms.
If the activation of this alarm is frequent it is recommended that the operator checks the operating conditions
of the plant.
The innovative HRS technology has enabled the development of a range of metering pumps that have the
ability to detect any changes in pressure inside the plant or malfunctions related to these variations. The
pump is able to provide useful information about the state of operation. Specifically, this is expressed in the
availability of two different types of signals.
a) UNDERLOAD: If during normal operation the pump has no fluid to be metered which may be caused by
problems on the suction line: clogged filter or damaged valves, the pump goes into UNDERLOAD status.
This condition is indicated by the signal on the display, the ALARM LED lights up and activates the
corresponding relay (if enabled). The pump stops after approximately 20 injections.
b) OVERLOAD: The pump during normal operation performs a check (in real time) on the pressure
conditions in the plant. If this pressure exceeds the maximum allowed (plate setting), the instrumentation of
the pump reacts reporting this state with a message on the display, the ALARM LED lights up and the relay
activates. Even in this case, the stopping of the pump occurs after 20 injections from the occurrence of the
event. Under particular conditions of pressure could occur the OVER-LOAD alarm even with air presence in
the pump body. We recommend that you take action to check the pump.
The UNDER-LOAD and OVER -LOAD functions can be enabled and disabled using the respective setup
menu. The factory settings for the UNDER LOAD and OVER LOAD functions are disabled.
Relay services output
In each submenu, you may enable or disable the intervention of a release associated to one or more of the
following alarms:
•
Level alarm
•
Flow switch alarm
•
Meter impulse alarm that intervenes in the 1xN (M) function
•
Meter impulse alarm in PPM
•
Meter impulse alarm in ml x m3
•
UNDERLOAD alarm
•
OVERLOAD alarm
By default, the alarms mentioned above are all disabled, except for the LEVEL ALARM (default ENABLED).
