Fresenius Medical Care GranuFlo Dissolution Unit II - 7.1 Specific Gravity Test Procedure

D I S S O L U T I O N C Y C L E Continued
P/N 450368 Rev I 15
11. In the FINAL FILL Operation, the Fill Valve will OPEN and the GranuFlo
Dissolution Unit II will fill to the FINAL WATER LEVEL.
12. When the FINAL WATER LEVEL is reached, the unit will automatically step
to HOMOGENIZE Operation. Remove the Large Access Lid and ensure the
solution level has reached the Final Fill Sensor. Place Large Access Lid onto
the GranuFlo Dissolution Unit II. Then, CLOSE the water supply valve to
the GranuFlo Dissolution Unit II.
13. During HOMOGENIZE Operation, the Mixer will mix the solution for ten
(10) minutes. When the HOMOGENIZE Operation is complete, the
Transfer Indicator LED will flash. Remove Large Access Lid and look into
the tank to make sure the granules have dissolved and the solution is
colorless.
14. Once you have verified the granules are dissolved and the solution is colorless, the solution is ready for
Specific Gravity Testing. If the granules have not dissolved and/or the solution is not colorless, call
Technical Service (1-800-227-2572) for further instructions.
7.1 SPECIFIC GRAVITY TEST
Once the Transfer Indicator Light flashes, the concentrate is ready to be tested. This test is done using a
hydrometer which measures the density of the acid in the concentrate. The resultant value is called the
"specific gravity". The specific gravity is measured to verify that the concentrate has been properly
mixed.
To determine a Specific Gravity Reading:
1. Prepare the Hydrometer and the Hydrometer Cylinder:
 Check Hydrometer for cracks. Do not use a cracked Hydrometer.
 Always handle the Hydrometer with care. Always hold it vertically by the top, as finger marks
lower down can affect the accuracy of the instrument.
 The Hydrometer should never be held by the stem horizontally.
 Rinse the hydrometer and the hydrometer cylinder separately with purified water before checking
solution for specific gravity. The purified water source must meet ANSI/AAMI or ISO standards for
dialysis currently ANSI/AAMI RD62, or ISO 13959.
 Once Hydrometer is clean, place the hydrometer onto a clean area.
 The Hydrometer is fragile and can break easily. Store in a safe area.
NOTE: DO NOT PLACE THE HYDROMETER INTO THE GRANUFLO DISSOLUTION UNIT II AT ANY TIME.
WARNING: SPECIFIC GRAVITY TEST MUST BE PERFORMED AFTER EVERY BATCH OF CONCENTRATE THAT IS MADE. IN
ADDITION, CONCENTRATE SAMPLES SHOULD BE TAKEN FROM THE TRANSFER HOSE ONLY.