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Metering Pumps
Operating and Maintenance Instructions
www.empirepumps.com
All alarm conditions are indicated by the lighting of the LED on the control panel and on the display. The
switching of the alarm relay also occurs (contacts 19, 20 and 21 fig.9) if enabled, where applicable, by the
different configuration menus. Relay switching occurs in all situations where enabling doesn't occur.
Level alarm
The floating level sensor signals when the liquid to be dosed into the tank is finished. The pump will stop,
indicating the alarm status. Connect the level sensor to the pump terminal box (see fig. 9), in
correspondence to terminals 5 and 6, and introduce it into the tank containing the additive to be dosed. In
order to prevent false alarms due to fluctuations in the liquid level itself the alarm occurs with a delay of at
least 3 sec.
Flow switch alarm
The electronic circuit of the pump, registers every blow given by the electromagnet, which is matched by an
injection of product from the pump body. In some cases the injection may not occur as a result of wear of
pump body parts, the valves, the O-rings, the presence of air, etc.
In the pumps equipped with a flow switch (hydraulic device which shows the actual passage of fluid) if the
missed injections occur within the sampling interval exceed the set parameters, the flow switch alarm
triggers and the injections stop. The parameters to set are the following:
REFERENCE IMPULSES
Number of impulses that the circuit samples
MAX DIFFERENCE
Maximum number of pulses permissible within the sampling
interval, that cannot be effectively provided
To better explain this function, consider for example, a sampling interval set to 100 impulses and a
maximum allowable difference of 10 pulses. The circuit memorises the impulses of the electromagnet and in
correspondence to each of these it expects a corresponding closing of the contact of the flow switch
connected to the hydraulic delivery of the pump. If the closures recorded are greater than or equal to 90
(100-10 = 90), the pump is operating normally and repeats the next sampling cycle. If, however, the closures
recorded are less than 90 the pump goes into alarm mode signalling the situation in the manner indicated
above.
Within the programming menu you can choose whether or NOT to STOP the metering in the case of an
alarm.
Meter impulses alarm
The impulse meter alarm activates in the multiplicative operation modes, namely: 1 x N (m), PPM e ml x m3.
This alarm is activated when the number of pulses generated by the meter is such as to require the pump to
run at a higher frequency than the maximum. This event may be generated by an incorrect programming or
an incorrect choice of the meter or by the metering pump in relation to the plant to be treated. The user in the
programming menu can choose whether to enable this type of alarm. It is recommended however to enable
it to provide a greater guarantee of correct metering and sizing check. It is also possible to choose, always
within the programming menu, whether or NOT to STOP the metering in the case of an alarm.
The alarm activates when the number of injections memorised and not dispensed exceeds the value 4 * N
where N is the number of injections to be given for each meter impulse. On the pump display the number of
