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2008K
2
Preventive Maintenance Procedures
P/N 508138 Rev. J
4.3 TESTING CONCENTRATE AND BICARBONATE PUMPS
The concentrate (acid) and bicarbonate pumps are tested by measuring the volume of
water they pump and comparing that measurement with the expected value
determined by the machine. The measured pump volume must be within 2% of the
expected value.
Test each pump as follows:
1. Place the machine in Dialysis Mode and open the shunt door.
2. Switch to the debug screens by pressing and holding the [] and [
▬
] data
entry keys at the same time for approximately 1 sec. The main display will
change indicating that the machine is in debug mode.
3. Use the [] or [
▬
] data entry keys to go to debug screen #1.
• Locate the debug value for FILACT. In order to turn off dialysate flow
later, FILACT must be 0.
• Locate the debug value for DOUBLE. Certain types of Bicarbonate or
higher Bicarbonate levels selected will require the pump to double
stroke. If the debug value for DOUBLE is 1, the pump is double
stroking. Before continuing the test, adjust the Bicarbonate level until
the debug value for DOUBLE is 0.
• If the debug values for the Bicarbonate Pump Volume (BMIN and
BMAX) are showing 0 on debug screen #1, the machine is set up for a
concentrate family that does not use bicarbonate. Change the
concentrate selection to one requiring bicarbonate.
Note: The AMIN, AMAX, BMIN, BMAX are the expected limits for twenty
pulses of the acid (concentrate) pump volume and the bicarbonate pump
volume, respectively. These volumes are based on the measured volume of the
balancing chamber to produce the correct mixing ratio.
4. Press the [Dialysate Flow on/off] key to stop dialysate flow.
5. Connect a 25ml buret filled with water to the concentrate connector for the
pump to be tested. Use a short length of tubing forced over the end of the
connector, and make sure there are no leaks in the fitting to the connector or
to the buret.
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