Pht- 5.0.0 All Pressure Tests Passed - Fresenius Medical Care 2008K2 Troubleshooting Manual

PHT- 5.0.0 ALL PRESSURE TESTS PASSED

BOTH Pressure Tests and the UF INTEGRITY TEST passed. See steps 1 through 6 below:
1) Check UF PUMP (1 ml/stroke volume) per the Preventative Maintenance Procedures booklet.
2) Verify accurate TMP by performing the Venous and Transmembrane Pressure checks in the
Preventative Maintenance Procedures booklet!
3) Read step 3 completely BEFORE performing it! Check Flow Pressure Calibration per the Calibration
Procedures booklet.
4) If (and ONLY if) you originally started out troubleshooting an "On Line PHT Failed" and not already
consider replacing the DiaSafe
5) The Troubleshooting Guide is unable to locate an immediate problem HOWEVER, if (and ONLY if) you
originally started out troubleshooting an "On Line PHT Failed" see step #6
6) At the time of Troubleshooting Guide's release an alternate Flow Pump calibration was being
considered that may solve some problems. Please call Technical Services (800-227-2572) for further
information.
Automated Pressure Holding Test (PHT) Theory:
A) Negative Pressure: With the balancing chamber (BC) valves cycling and the Flow Pump #21 running
these tests begin with "Get Neg TMP". The UF Pump (#22) strokes until approximately -260 mmHg
(TMP = 260 mmHg) is achieved as monitored by Dialysate Pressure Transducer (#9). This normally
takes less than one (1) minute. When -160 mmHg is reached the UF Pump stops and "Neg Flow On"
appears. A thirty (30) second stabilization period begins followed by a thirty (30) second hold period. If
pressure remains stable (+/- 20 mmHg) for one minute the test passes.
B) Positive Pressure: All four 'fresh side' BC valves open briefly to drive positive (loading) pressure into
the secondary circuit then all eight BC valves close and Flow Pump stops. Because target pressure
(approximately +300 mmHg) is overshot the UF Pump strokes until the target (+300 mmHg) is achieved.
"Pos Flow Off" appears and a thirty (30) second stabilization period begins followed by a thirty (30)
second hold period. If pressure remains stable (+/- 30 mmHg) for one (1) minute the test passes.
C) On Line Pressure Holding Tests (On Line PHT), if activated are performed automatically every 720
seconds (12 minutes). They monitor current Dialysate Pressure (i.e. pressure is not created as it is
during Negative Flow On/Positive Flow Off Tests). Dialysate Flow is momentarily set to 500 ml/min,
Valve #26 opens and Valves #24 and #25 close (to isolate the dialyzer circuit). Dialysate pressure is
monitored for two (2) consecutive balancing chamber cycles, approximately seven (7) seconds. If
pressure remains stable the On Line PHT passes.
D) Related to On Line PHT, from debug screen 1 (see next page):
It MUST be set to between 35 and 36 psi!
®
filter.
2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
Page 488