Mesa Labs 90XL Technician Meter
Mesa Labs · Model 90XL Technician Meter
Conductivity , pH, temperature and pressure meter. The 90XL Meter is a modular system. The system consists of the display module and the sensor modules. The display module is the controller for the system with a large display, microprocessor, circuitry, keypad and a rechargeable lithium ion battery power supply. Individual sensor modules are available for measuring either conductivity/temperature, pH, or pressure. The sensor modules contain the appropriate sensors and the circuitry for measuring the desired parameter of the sample solution. Up to four sensors, in any combination, can be used simultaneously, with all parameters displayed on the display module screen.
Key tips
- ·Conductivity and water-quality checks are non-negotiable before every shift - dialysate chemistry errors are a direct patient-harm mechanism.
- ·Confirm disinfection cycle completion, never assume it, after every use.
- ·Treat a blood-leak detector fault as real until proven otherwise - never silence and continue.
Typical Failure Modes
Failure patterns typical of this equipment class - general BMET reference, not verified against this exact unit's own service history unless flagged. Severity is a category-level estimate.
Blood leak detector false/real
HighSymptoms: Blood leak alarm, treatment stop.
Root cause: Optical cell dirty or true leak.
Conductivity / dialysate fault
HighSymptoms: Conductivity out of range, dialysate alarm.
Root cause: Mixing valve or sensor fault.
Blood pump occlusion / wear
MediumSymptoms: Flow error, roller wear alarm.
Root cause: Pump segment fatigue.
Ultrafiltration error
MediumSymptoms: UF inaccuracy, weight alarm.
Root cause: Balance system / scale fault.
Serviceable Parts & Consumables
The parts a BMET typically services on this class of equipment. Service class and relative cost are general engineering estimates for the category, not figures from this unit's documentation. Part numbers appear only when pulled from this unit's own service manual. Always confirm intervals and pricing against the manufacturer.
Blood pump roller
Class Periodic replacementRel. cost $$R&R Fairly easy
Heparin pump syringe drive
Class Periodic replacementRel. cost $$R&R Moderate
Blood tubing set / roller segment
Per-treatment consumable.
Class ConsumableRel. cost $$R&R Easy
Dialyzer (filter)
Single-use.
Class ConsumableRel. cost $$R&R Easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Blood pump roller | Periodic replacement | $$ | Fairly easy |
| Heparin pump syringe drive | Periodic replacement | $$ | Moderate |
| Blood tubing set / roller segment Per-treatment consumable. | Consumable | $$ | Easy |
| Dialyzer (filter) Single-use. | Consumable | $$ | Easy |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
PM Checklist
Preventive-maintenance tasks typical of this equipment class. Perform to the manufacturer's procedure and your facility's policy - this is general reference, not a schedule for this specific unit.
- ·Disinfection cycle verification
- ·Conductivity and water-quality check
- ·Blood-leak detector test
- ·Scheduled tubing / filter replacement
- ·Annual full PM
Troubleshooting Approach
A structured starting point derived from the failure modes above. Follow the manufacturer's service documentation for the actual procedure.
Symptom: Blood leak detector false/real
- Confirm the presentation - typically blood leak alarm, treatment stop - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: optical cell dirty or true leak.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the blood tubing set / roller segment per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Symptom: Conductivity / dialysate fault
- Confirm the presentation - typically conductivity out of range, dialysate alarm - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: mixing valve or sensor fault.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the dialyzer (filter) per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Dialysis unit / clinic
- ICU (acute dialysis)
- Home hemodialysis
Documents & Manuals
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