Maintenance; General Notes; Cleaning And Maintenance Intervals - Grundfos DMX 227 Installation And Operating Instructions Manual

9.1.7 Start-up
Caution
Carry out a functional check before start-up!
Functional check
• Dip the sensor into water.
– Green and red LEDs are on:
Sensor and electronics are ready for operation!
– One or more LEDs are off:
Sensor or electronics is defective!
Call Grundfos service.
• Carefully dry the sensor.
– Only the green LED is still on:
Sensor and electronics are ready for operation!
– The red LED is still on:
Sensor or electronics is defective!
Call Grundfos service.
Warning
Do not open the electronics or sensor!
Repairs must only be carried out by authorised and
qualified personnel!
9.1.8 Using the contacts
• Terminals 6 and 7 (potential-loaded)
– for instance for switching off the pump in case of a
diaphragm leakage.
• Terminals 8, 9 and 10 (potential-free)
– for instance for triggering an alarm device.
9.1.9 Description of the device
There are a green and a red light-emitting diode (LED) at the
electronics.
• Green LED
– shows that the system is ready for operation.
– The LED is only on when the sensor is connected to the
electronics.
If the LED is off in this case, either the sensor or the cable is
defective or wrongly connected.
• Red LED
– shows that a diaphragm leakage has been detected.
– The green LED is still on.

9.1.10 Maintenance

Warning
Do not open the electronics or sensor!
Repairs must only be carried out by authorised and
qualified personnel!
Sensor
Optoelectronic sensor with 3 metres cable.
• Clean the sensor in case of malfunction.
• If the sensor still does not operate correctly, replace it.
Electronics
• No maintenance is possible by the user.
• If the electronics does not operate correctly, call Grundfos
service.
16
10. Maintenance

10.1 General notes

Warning
When dosing dangerous media, observe the
corresponding safety precautions!
Risk of chemical burns!
Wear protective clothing (gloves and goggles) when
working on the dosing head, connections or lines!
Do not allow any chemicals to leak from the pump.
Collect and dispose of all chemicals correctly!
Warning
The pump housing must only be opened by
personnel authorised by Grundfos!
Repairs must only be carried out by authorised and
qualified personnel!
Switch off the pump and disconnect it from the power
supply before carrying out maintenance work and
repairs!

10.2 Cleaning and maintenance intervals

In the event of a diaphragm leakage, the dosing
liquid may leak out of the hole in the intermediate
flange between the pump and the dosing head. The
parts inside the housing are protected from the
dosing liquid for a short time (depending on the type
Caution
of liquid) by the housing sealing. It is necessary to
check regularly (daily) if liquid is leaking out of the
intermediate flange. For maximum safety, we
recommend the pump version with diaphragm
leakage detection.
10.2.1 Changing the gear oil
Warning
The gear oil must only be changed by authorised and
qualified personnel.
For this purpose, send the pump to Grundfos or an
authorised service workshop.
To ensure trouble-free operation, it is recommended to regularly
change the gear oil.
Use exclusively original gear oil.
When changing the gear oil, check the dosing
Caution
diaphragm and, for safety reasons, replace, if
necessary.
10.2.2 Cleaning the diaphragm and valves
Clean the diaphragm and valves, and replace, if necessary (with
stainless-steel valves: inner valve parts):
• At least every 12 months or after 3,000 operating hours.
• In the event of a fault.