Fresenius 4008S
Fresenius · Model 4008S
The effective in-vivo urea clearance (K) The accumulated cleared plasma (Kt) or the current dialysis dose administered (Kt/V) The plasma sodium concentration: possible deviations to the prescribed therapy goal can be detected and corrected immediately during treatment* without incurring additional expenses for disposables or staff efforts. Advanced dialysis fluid circuit with highly-precise volumetrically controlled ultrafiltration Consistently reliable hydraulics. High-quality HD treatment to protect your patient. Easy, fast and intuitive handling TDMS (Therapy Data Management System) BPM (Blood Pressure Monitor) CDS (Central Concentrate Delivery System) AdaptedFlow1.
Typical Failure Modes
Compiled for this model from its own documentation and established engineering knowledge for this equipment class - not from a verified service record. Confirm against the manufacturer's service manual.
Conductivity / proportioning alarm
HighSymptoms: Conductivity out of window, bypass, treatment cannot start.
Root cause: Wrong or empty concentrate, air in the concentrate line, or a mixing-chamber / conductivity-cell fault.
Blood leak / air detector alarm
HighSymptoms: "Blood leak" or "air" alarm, blood pump stops, venous clamp closes.
Root cause: Genuine dialysate discolouration, a dirty blood-leak-detector optic, air in the venous line, or a detector fault.
TMP / pressure alarm
MediumSymptoms: Arterial, venous or TMP pressure out of limits, frequent alarms.
Root cause: Kinked lines, a clotting dialyser, or a pressure-transducer / protector fault.
Balancing chamber / UF fault
HighSymptoms: UF volume error, fluid-balance alarm, treatment halts.
Root cause: Balancing-chamber diaphragm or valve fault.
Dialysate temperature alarm
MediumSymptoms: Temperature out of range, bypass.
Root cause: Heater or temperature-sensor fault.
Serviceable Parts & Consumables
Serviceable items for this model, compiled from its documentation and engineering knowledge for this equipment class. Service class and relative cost are estimates, not manufacturer figures; no part numbers are given. Confirm intervals and pricing against the manufacturer.
Balancing chamber diaphragm / valve kit
Class Periodic replacementRel. cost $$$R&R Difficult
Conductivity cell
Class Periodic replacementRel. cost $$R&R Moderate
Blood-leak detector assembly
Class Major service partRel. cost $$R&R Moderate
Pressure-transducer protectors
Class ConsumableRel. cost $R&R Easy
Dialysate heater / temperature sensor
Class Major service partRel. cost $$R&R Difficult
Blood pump rotor
Class Periodic replacementRel. cost $$R&R Moderate
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Balancing chamber diaphragm / valve kit | Periodic replacement | $$$ | Difficult |
| Conductivity cell | Periodic replacement | $$ | Moderate |
| Blood-leak detector assembly | Major service part | $$ | Moderate |
| Pressure-transducer protectors | Consumable | $ | Easy |
| Dialysate heater / temperature sensor | Major service part | $$ | Difficult |
| Blood pump rotor | Periodic replacement | $$ | Moderate |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
Troubleshooting Approach
A starting sequence for this model, compiled from its documentation and engineering knowledge for this equipment class. Follow the manufacturer's service documentation for the actual procedure.
Symptom: Conductivity alarm
- Confirm the correct concentrate is connected and not empty.
- Check the concentrate connectors and lines for air.
- Run the machine's rinse / self-test.
- Verify conductivity against an independent meter and calibrate the cell if needed.
- Replace the conductivity cell or service the mixing chamber if it will not hold spec.
Symptom: Blood leak alarm
- Visually check the dialysate outflow for pink discolouration - if present, terminate and return the patient's blood per protocol.
- If the dialysate is clear, clean the blood-leak-detector optics.
- Run the detector self-test.
- Recalibrate the detector.
- Replace the detector assembly if it still false-alarms.