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What This Guide Helps With
Troubleshooting missing, unstable, inaccurate, or non-zeroing invasive pressure channels caused by transducers, cables, connections, setup, positioning, or module communication.
Step-by-Step Troubleshooting
1. Ensure Patient Safety First
Do not troubleshoot an invasive pressure problem while the BeneView monitor is the only device supporting an actively monitored patient.
- Notify the clinical team that the invasive pressure value or waveform is unavailable or unreliable.
- Assess the patient using another approved clinical method.
- Transfer monitoring to another verified monitor when continuous invasive pressure monitoring is required.
- Do not assume an abnormal, drifting, or absent pressure reading is solely an equipment problem.
Expected outcome: Patient care continues without relying on the affected pressure channel.
Continue Clinical Engineering troubleshooting only after the equipment can be safely evaluated.
2. Confirm the Exact Failure
Observe and document whether:
- The invasive pressure parameter is absent from the display.
- The monitor shows a disconnected transducer or cable message.
- The waveform is flat, noisy, intermittent, or drifting.
- The pressure value remains dashed.
- The channel will not complete a zero.
- The zero value changes significantly after being established.
- One pressure channel is affected or all invasive pressure channels are unavailable.
Verify that the correct pressure label, such as ART, CVP, PAP, ICP, or LAP, is assigned.
Expected outcome: The specific channel, symptom, and displayed message are identified.
3. Inspect the Transducer and Pressure Setup
Have clinical staff confirm that the pressure system is properly prepared before evaluating the monitor.
Check that:
- The approved pressure transducer is connected.
- The pressure tubing is intact and securely connected.
- Stopcocks are positioned correctly.
- The system is free of obvious air bubbles, clots, kinks, or closed clamps.
- The transducer is appropriately leveled for the intended clinical measurement.
- The transducer has been opened to atmospheric pressure when attempting to zero.
Do not manipulate or flush a patient-connected pressure line unless authorized and performed by qualified clinical staff.
Expected outcome: The external pressure setup is correctly configured for measurement and zeroing.
If correcting the setup restores a stable waveform and appropriate value, verify operation and stop.
4. Inspect the Transducer Cable
Disconnect the transducer cable from the monitoring module and inspect:
- Connector pins for bending, contamination, moisture, or corrosion.
- The cable body for cuts, crushing, stretching, or exposed conductors.
- Strain-relief areas for separation or intermittent damage.
- The transducer connection for looseness or incomplete engagement.
Reconnect both ends firmly without forcing the connectors.
Expected outcome: The transducer and cable are securely connected with no visible damage.
If the channel returns and remains stable, perform a functional verification and stop.
5. Substitute Known-Good External Components
Using compatible, hospital-approved equipment, substitute one component at a time:
- Known-good transducer cable.
- Known-good pressure transducer or simulator.
- Known-good disposable pressure setup, when supplied and handled by clinical staff.
Do not substitute multiple items simultaneously unless necessary, because this prevents identifying the actual cause.
Expected outcome: A defective transducer, cable, or disposable setup is isolated.
If replacing an external component resolves the issue, remove the defective component from use and stop.
6. Confirm the Pressure Channel Is Enabled
Review the monitor’s parameter and screen configuration.
Verify that:
- The invasive pressure parameter is enabled.
- The appropriate waveform and numeric field are assigned to the current screen.
- The channel has not been hidden by the selected screen layout.
- The pressure label has not been changed unexpectedly.
- The monitor is not using a profile that excludes invasive pressure display.
Mindray BeneView configurations can control displayed parameters, labels, waveforms, and screen layouts.
Expected outcome: The correct pressure channel appears on the monitoring screen.
If restoring the parameter or selecting the correct screen resolves the issue, verify normal operation and stop.
7. Attempt a Proper Zero
Only zero the channel when it is safe and the transducer is correctly prepared.
- Confirm the transducer is leveled appropriately.
- Open the transducer to atmospheric pressure.
- Confirm the patient side is closed according to the approved clinical procedure.
- Select the affected pressure channel.
- Initiate the zero command.
- Observe whether the monitor confirms a successful zero or displays an error.
The transducer must be exposed to atmospheric pressure during zeroing; pressure, movement, an incorrect stopcock position, or a defective transducer can prevent completion.
Expected outcome: The monitor completes the zero and displays a stable baseline.
If zeroing succeeds and the waveform remains stable after returning the system to measurement, stop.
8. Check for Motion, Vibration, and Electrical Interference
If the waveform drifts or contains excessive artifact:
- Place the transducer and cable where they will not be pulled or repeatedly moved.
- Separate the cable from power cords, electrosurgical equipment, warming equipment, pumps, or other potential interference sources.
- Check whether artifact appears only when another device operates.
- Confirm the cable is not routed through a bedrail, caster, or articulated joint.
- Inspect for fluid contacting the transducer or connector.
Expected outcome: The waveform remains stable when external movement and interference are removed.
If repositioning the cable or eliminating interference resolves the issue, document the cause and stop.
9. Test the Alternate Invasive Pressure Channel
When the module provides more than one invasive pressure input:
- Connect the known-good simulator, transducer, and cable to another compatible pressure channel.
- Assign the appropriate pressure label.
- Zero and test the alternate channel.
- Compare its operation with the original channel.
Expected outcome:
- If the alternate channel works, the original input may be defective.
- If neither channel works, suspect the shared module, interface, configuration, or accessory.
- If the problem follows the cable or transducer, the external component is defective.
Do not connect a patient line solely for troubleshooting.
10. Reseat the Parameter Module or Acquisition Assembly
If the BeneView configuration uses a removable measurement module or module rack:
- Remove the monitor from patient use.
- Shut down or disconnect the module according to facility procedures.
- Inspect the module and rack connectors for contamination, moisture, bent contacts, or physical damage.
- Reseat the module fully.
- Restart the monitor and allow it to complete initialization.
- Reconnect only the known-good pressure simulator or test setup.
The BeneView platform supports modular parameter acquisition, and a poor module connection can interrupt parameter recognition or communication.
Expected outcome: The module is recognized and the invasive pressure channel becomes available.
If reseating restores reliable operation, complete a functional verification before returning the device to service.
11. Perform a Pressure Simulator Test
Connect an approved invasive blood pressure simulator using a known-good cable.
Verify:
- The channel can be zeroed.
- The expected waveform appears.
- Displayed systolic, diastolic, mean, or static pressure values agree with the simulator within the facility’s accepted tolerance.
- The reading remains stable over several minutes.
- Light cable movement does not cause signal loss or sudden pressure changes.
Test each affected input individually.
Expected outcome: The monitor consistently recognizes and accurately displays the simulated pressure.
If the monitor fails with a known-good simulator and cable, the fault is likely within the pressure input, module, connector, or acquisition circuitry.
12. Restart and Recheck the Configuration
With the monitor removed from patient use:
- Shut the monitor down normally.
- Disconnect nonessential accessories.
- Restart the system.
- Confirm the measurement module is recognized.
- Recheck the pressure channel, label, screen configuration, and zero function.
- Observe for technical alarms or module communication messages.
Do not perform a factory reset or load an unrelated configuration without authorization, because patient-monitor settings and network configurations may be affected.
Expected outcome: A temporary communication or software condition clears and the channel operates normally.
If the problem returns, continue to escalation.
If the Problem Persists
If a known-good simulator, cable, correct configuration, alternate input, module reseating, and proper zero procedure do not resolve the issue, common external causes have been ruled out.
The problem is likely associated with the:
- Invasive pressure input connector.
- Parameter module.
- Module rack or interface.
- Internal acquisition circuitry.
- Internal communication pathway.
- Software or configuration system.
The device should be:
- Removed from service.
- Labeled Out of Service.
- Sent for authorized repair or bench evaluation.
- Evaluated using the applicable Mindray service documentation and approved test equipment.
Do not attempt board-level repair or internal adjustment without appropriate training, documentation, and authorization. Knowing when to stop is proper troubleshooting.
Clinical Use Tip
Never troubleshoot a missing or questionable invasive pressure waveform while the patient depends on that channel for clinical decisions. Transfer monitoring first and have qualified clinical staff verify the transducer, leveling, stopcock position, and patient line.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Clinical staff reported that the BeneView T Series ART channel displayed a drifting waveform and would not complete a zero."
Cause
What was observed during troubleshooting.
Example:
"Testing found an intermittent invasive-pressure cable that produced unstable readings when the connector was moved."
Resolution
What action was taken.
Example:
"Replaced the defective cable, successfully zeroed the ART channel, verified stable simulator readings, and returned the monitor to service."
Helpful Details to Include (If Known)
- Affected pressure channel and assigned label
- Exact technical message displayed
- Whether the parameter was missing or only hidden
- Transducer leveled and opened to atmosphere
- Stopcock configuration verified by clinical staff
- Known-good cable tested
- Known-good transducer or simulator tested
- Alternate pressure input tested
- Measurement module reseated
- Module or connector damage observed
- Pressure simulator values and tolerances
- Drift, noise, or intermittent behavior observed
- Final device status
Final Thought
Safe invasive-pressure troubleshooting begins by protecting the patient and confirming the clinical setup. Evaluate transducers, cables, configuration, zeroing conditions, and module connections logically before suspecting an internal fault. Escalate when simulator testing confirms the failure, and document the complaint, cause, and resolution clearly.
That is successful troubleshooting.