Mindray BeneView T Series

Asset Type

Patient Monitor

Manufacturer

Mindray

Model

BeneView T Series

Manual Reference

Mindray BeneView T5 Patient Monitor Service Manual, Revision 8.0, October 2011

Applicability note: The provided manual specifically covers the BeneView T5. This procedure may be useful for related BeneView T-series configurations, but applicability to models other than the T5 should be confirmed against the model-specific service documentation.

Manufacturer Recommendation / AEM Status

Manufacturer-Listed PM Items

The manual identifies the following as preventive-maintenance tests:

• Visual inspection
• NIBP pressure accuracy, leakage, and calibration
• Sidestream and Microstream CO₂ leakage, accuracy, and calibration, when installed
• Anesthetic gas module leakage, accuracy, and calibration, when installed

The manual also separately lists:

• Parameter performance testing
• Electrical safety testing
• Power-on testing
• Battery testing
• Optional recorder, network-printer, nurse-call, analog-output, and device-integration testing based on configuration or service activity

Manufacturer-Listed Frequencies

NIBP, Sidestream or Microstream CO₂, and Anesthetic-Gas Testing

Perform:

• When measurement accuracy is suspected
• Following repair or replacement of the relevant module
• At least annually

Configured Parameter Performance Tests

Perform:

• When measurement accuracy is suspected
• Following repair or replacement of the relevant module
• At least once every two years

The manual specifically notes that NIBP, CO₂, and anesthetic-gas testing should still be completed at least annually.

Electrical Safety Testing

Perform:

• Following repair or replacement
• After the monitor has been dropped
• At least once every two years

Visual Inspection and Power-On Test

The manual lists these tests when the monitor is first installed or reinstalled. A visual and functional inspection should also be included during scheduled facility PM as a practical safety check.

Battery Check

The manual lists a battery functional check:

• When first installed
• Whenever a battery is replaced

The provided service manual does not specify a time-based battery replacement interval.

Electrical Safety Scope Clarification

Chapter 3 lists electrical safety testing at least every two years and directs the technician to Appendix A. However, the Appendix A American inspection form identifies only the power cord, enclosure and accessories, labeling, and functional testing for a scheduled inspection. Protective-earth and leakage measurements are added for certain opened repairs or modifications.

Document which Appendix A test category was applied. Do not automatically represent every leakage-current test as a routine scheduled-PM requirement when the manual’s inspection form limits those tests based on the type of service performed.

Post-Repair Requirements

• Electrical safety testing is manufacturer-listed following repair or replacement.
• Electrical safety testing is also listed after the monitor has been dropped.
• When a parameter module has been disassembled and reassembled, complete a patient leakage-current test before returning the module to monitoring use.
• Complete relevant parameter performance tests following repair or replacement of the affected module.

AEM Status

If the facility performs this PM at a different interval or changes the listed activities, document the change through the facility’s approved AEM program, risk assessment, maintenance history, and applicable regulatory requirements.

What This PM Procedure Covers

• Physical and labeling inspection
• Power-up, display, controls, alarms, and indicators
• AC-to-battery transfer and T5 single-battery operation
• Configured parameter performance checks
• Annual NIBP verification
• Optional configured CO₂ and anesthetic-gas testing
• Electrical safety inspection based on the applicable service category
• Final operational and return-to-service determination

Required Tools and Equipment

Use only the equipment applicable to the monitor’s installed configuration.

Basic PM

• Calibrated electrical safety analyzer when electrical measurements are applicable
• Patient simulator capable of ECG, respiration, temperature, IBP, and other installed parameters
• NIBP simulator or calibrated pneumatic test equipment
• Calibrated reference manometer with accuracy of at least 1 mmHg
• T-connector
• Appropriate pneumatic tubing
• Balloon pump
• Rigid vessel, 500 ±25 mL
• Adult NIBP cuff and cylinder for the automatic leakage test

Configuration-Dependent Equipment

• Resistance box accurate to at least 0.1 Ω for temperature verification
• Appropriate IBP simulator and adapter cable
• Certified CO₂ test gas, regulator, tubing, and T-connector
• Certified anesthetic-gas mixtures and an appropriate gas-disposal arrangement
• Oscilloscope for analog-output testing
• Multimeter for nurse-call relay testing
• Recorder paper when the integral recorder is installed

All simulators, analyzers, pressure references, and test gases must be within their current calibration or expiration period.

Step-by-Step PM Procedure

1. Identify the Monitor and Configuration

Record:

• Model
• Serial number
• Hardware version
• Software version
• Installed parameter modules
• Battery configuration
• Recorder, SMR, network printer, BeneLink, nurse-call, and analog-output options

Determine whether the work is:

• Routine scheduled inspection
• Unopened repair inspection
• Opened repair without power-part or patient-circuit modification
• Opened repair involving the power section or patient circuit

Expected outcome: The correct tests are selected for the monitor’s configuration and service history.

2. Inspect the Monitor

Inspect:

• Case and handle
• Display and touchscreen
• Buttons and rotary knob
• Alarm lamps
• Integral module rack and SMR when present
• Installed parameter modules
• AC power cord and plug
• Wall mount, roll stand, or mounting hardware
• Patient cables and accessories included with the PM
• External connectors, pins, and cables
• Safety labels, rating label, and data plate

Confirm:

• No cracks, contamination, fluid intrusion, deformation, or evidence of impact
• No frayed cables, exposed conductors, loose connectors, or bent pins
• Labels are present and legible
• Mounting equipment is secure

Expected outcome: No physical condition exists that could affect safe operation.

3. Power-On and Alarm Self-Test

1. Install the batteries and connect the monitor to AC power.
2. Confirm the AC and battery indicators illuminate.
3. Turn the monitor on.
4. Observe the operating-status indicator.
5. Confirm the physiological and technical alarm lamps illuminate during startup.
6. Listen for the startup alarm-tone self-test.
7. Confirm the monitor completes startup and reaches the normal monitoring screen.
8. Check for technical alarms or startup errors.

Expected outcome: The monitor starts normally, the indicators operate, the alarm lamps complete their startup sequence, and the audible self-test tone is produced.

Remove from service if: The monitor freezes, repeatedly restarts, fails its alarm-output self-test, or displays unresolved technical errors affecting safe monitoring.

4. Check Display, Touchscreen, Keys, Knob, and Alarm Outputs

Verify:

• The display is clear, stable, and readable.
• Backlight and brightness adjustment operate.
• The touchscreen responds at multiple locations.
• Front-panel keys operate.
• The rotary knob rotates, highlights selections, and confirms selections.
• The physiological alarm lamp operates.
• The technical alarm lamp operates.
• The audible alarm is clear and sufficiently loud.

Calibrate the touchscreen only if touch position is abnormal or the touchscreen was replaced.

Expected outcome: All local controls, visual alarm outputs, and audible alarm outputs operate correctly.

5. Verify AC and Battery Operation

1. Operate the monitor on AC power.
2. Confirm the batteries are detected and show charging status.
3. Disconnect AC power.
4. Confirm the monitor transfers to battery operation without shutting down or restarting.
5. Reconnect AC power and confirm normal operation and charging indication.
6. For the T5, remove one battery and verify operation from the remaining battery.
7. Reinstall the battery and repeat the test with the other battery removed.

A full runtime or capacity test may be performed according to facility policy and the applicable operator-manual battery specification.

Expected outcome: The monitor transfers between AC and battery power correctly, and a T5 can operate from either battery independently.

Remove from service if: The monitor shuts down during transfer, a battery is damaged or swollen, charging is abnormal, or available capacity is insufficient for its intended clinical use.

6. ECG and Heart-Rate Test

1. Connect a patient simulator using an appropriate ECG cable.
2. Set the simulator to sinus rhythm, 80 bpm, and 1 mV amplitude.
3. Confirm the ECG waveform is displayed without excessive noise.
4. Confirm the displayed heart rate is 80 ±1 bpm.
5. Disconnect each lead and confirm the corresponding lead-off indication.
6. Apply a paced signal.
7. Set the monitor’s paced-patient setting to Yes.
8. Confirm pace-pulse markers appear.

ECG Calibration Check

Initiate ECG calibration and compare the displayed calibration square wave with the scale.

Acceptance: Difference no greater than 5%.

Expected outcome: ECG acquisition, heart-rate calculation, lead-off detection, paced-signal indication, and calibration response are correct.

7. Respiration Test

1. Connect the simulator using the appropriate non-ESU-proof cable.
2. Select lead II for respiration.
3. Set the base impedance to 1500 Ω.
4. Set the delta impedance to 0.5 Ω.
5. Set the respiration rate to 40 rpm.
6. Confirm the respiration waveform is not distorted.

Acceptance: Displayed respiration rate of 40 ±2 rpm.

8. SpO₂ Functional Check

The manual describes a healthy-person functional check rather than an accuracy verification with an SpO₂ simulator.

1. Connect the appropriate SpO₂ sensor.
2. Confirm a plethysmographic waveform and pulse rate are displayed.
3. Remove the sensor.
4. Confirm the monitor produces the appropriate sensor-off indication.

Manufacturer-listed functional expectation: A healthy-person reading is 95%–100%.

Important: Do not represent this procedure as traceable SpO₂ accuracy calibration. A functional tester can verify response to a simulated calibration curve but does not independently establish pulse-oximeter accuracy.

9. NIBP Accuracy Test — Annual

1. Inspect the cuff, hose, and connectors for damage.
2. Connect the monitor to a calibrated pressure reference and 500 ±25 mL rigid vessel.
3. Vent the system and verify both the monitor and reference read 0 mmHg.
4. Enter NIBP Accuracy Test.
5. Compare the monitor and reference at 0 mmHg.
6. Pressurize to 50 mmHg, allow stabilization, and compare readings.
7. Pressurize to 200 mmHg, allow stabilization, and compare readings.

Acceptance: Difference within ±3 mmHg at each test pressure.

Calibrate the NIBP system only when the accuracy test fails and after confirming the external test setup is leak-free.

10. NIBP Leakage Test — Annual

Perform the accuracy test first and confirm that it passes.

Automatic Method

1. Set the patient category to Adult.
2. Connect an adult cuff.
3. Wrap the cuff securely around an appropriate cylinder.
4. Start NIBP Leakage Test.
5. Allow the approximately 20-second test to complete.

Acceptance: No NIBP pneumatic-leak message.

Manual Method

1. Connect the calibrated pneumatic test system.
2. Pressurize the system to 250 mmHg.
3. Allow five seconds for stabilization.
4. Record the initial pressure.
5. Record the pressure after 60 seconds.

Acceptance: Pressure loss no greater than 6 mmHg per minute.

11. Temperature Test

1. Test each installed temperature channel.
2. Connect a calibrated resistance box.
3. Set the resistance to 1354.9 Ω, corresponding to 37°C.
4. Observe each temperature channel.

Acceptance: 37.0 ±0.1°C.

12. IBP Test

1. Test each installed IBP channel.
2. Apply 0 mmHg and zero the channel.
3. Apply a static pressure of 200 mmHg.

Acceptance: 200 ±2 mmHg.

Apply the following simulated waveforms and confirm each is displayed correctly:

• ART waveform: 120/80 mmHg
• LV waveform: 120/0 mmHg

Perform calibration only when a channel fails the performance test and the test equipment and connections have been verified.

13. Other Configured Parameter Tests

Complete only those tests applicable to the installed modules.

Manufacturer-listed examples include:

• Cardiac output: blood temperature 37 ±0.1°C and cardiac output 5.0 ±0.25 L/min
• ICG
• BIS
• Respiration mechanics
• CCO/SvO₂
• PiCCO
• ScvO₂
• Mainstream CO₂
• Sidestream or Microstream CO₂
• Anesthetic gas

Use the exact setups and limits in Chapter 3 of the model-specific service manual. Do not substitute generic simulator tolerances for the manufacturer-listed values.

14. Sidestream or Microstream CO₂ Tests — Annual When Installed

Leakage Test

1. Allow the module to warm up fully.
2. Block the module or water-trap inlet.
3. Verify the expected occlusion or FilterLine alarm behavior described for the installed module type.

Expected outcome: The indicated alarm remains present during the specified blocked-inlet period, demonstrating that the sample path is not leaking.

Accuracy Test

Use certified 6 ±0.05% CO₂, balance nitrogen.

Acceptance: Displayed concentration within the manufacturer-listed test-gas value of 6 ±0.05%.

Perform calibration only after warmup, successful leakage verification, and confirmation that the test-gas setup is correct.

15. Anesthetic-Gas Module Tests — Annual When Installed

1. Allow the module to warm up for at least ten minutes.
2. Verify the module fan operates.
3. Block the gas inlet and confirm the airway-occlusion alarm remains present as described in the manual.
4. Apply certified gas mixtures meeting the manual’s concentration and accuracy requirements.
5. Compare measured CO₂, N₂O, O₂, and anesthetic-agent values against the applicable operator-manual specifications.
6. Provide proper scavenging or disposal of exhaust test gas.

Expected outcome: No sample-system leakage, proper fan operation, and all installed gas measurements within the applicable manufacturer specifications.

16. Recorder and Optional Output Checks

Recorder, When Installed

1. Print an ECG waveform.
2. Confirm the print is clear and feeds correctly.
3. Verify out-of-paper or other recorder messages.
4. Confirm recording resumes after correcting the condition.
5. Verify automatic alarm recording when that feature is enabled.

Nurse Call, When Used

Test according to facility configuration and alarm-routing policy. Confirm relay operation for the configured pulse or continuous output.

Analog Output, When Used

Compare the output waveform on an oscilloscope with the waveform displayed on the monitor.

Network Printer or BeneLink

Test when required by:

• Initial installation
• Repair or replacement
• Facility policy
• Reported communication problems

Electrical Safety Testing

Applicable Inspection Category

Document the category used:

• Scheduled inspection
• Unopened repair
• Opened repair without power-part or patient-circuit modification
• Opened repair involving the power section or patient circuitry
• Post-drop inspection

The Appendix A American inspection form identifies scheduled-inspection items as:

• Power cord and plug
• Enclosure and accessories
• Device labeling
• Functional test

Additional measured tests are assigned according to the repair category.

Protective-Earth Resistance

The manual-listed maximum is 0.2 Ω when this measurement is applicable.

Ground resistance measured in ohms, expected ≤ 0.2 Ω or facility/NFPA 99 criteria if different.

Result =

Earth/Chassis Leakage

When required by the applicable service category, the manual-listed limits are:

• Normal condition: ≤300 µA
• Single-fault condition: ≤1000 µA

Touch/chassis leakage measured in microamps:

Test condition = Normal / Single fault

Facility limit used =

Result =

Pass / Fail =

Patient Leakage and Applied-Part Tests

Complete the applicable tests after repairs or modifications that may affect patient leakage. The manual’s American inspection form lists:

• Patient leakage, normal condition: ≤10 µA
• Patient leakage, single-fault condition: ≤50 µA
• Mains on applied part: ≤50 µA
• Patient auxiliary current, normal condition: ≤10 µA
• Patient auxiliary current, single-fault condition: ≤50 µA

When a parameter module is disassembled and reassembled, complete patient leakage-current testing before returning the module to monitoring use.

Do not use a single chassis-leakage result as a substitute for required patient-applied-part testing.

Pass / Fail Criteria

Pass

The PM passes when:

• No unsafe physical damage is present.
• Labels and connectors are intact.
• The monitor starts normally.
• Audible and visual alarm outputs operate.
• The display, touchscreen, keys, and knob function correctly.
• AC and battery transfer occurs without interruption.
• T5 operation from each battery independently is verified.
• NIBP accuracy is within ±3 mmHg.
• NIBP pressure loss is no greater than 6 mmHg per minute.
• All tested parameters meet their manufacturer-listed tolerances.
• Required electrical safety tests pass.
• No unresolved safety-related technical alarms remain.

Remove From Service

Remove the monitor from service when:

• There is enclosure, power-cord, connector, mounting, or liquid-intrusion damage affecting safety.
• Startup, alarm lamps, or audible alarm self-test fails.
• The monitor freezes, restarts, or shuts down unexpectedly.
• AC-to-battery transfer fails.
• NIBP or another required monitoring parameter fails verification and cannot be corrected.
• Protective-earth or leakage-current testing exceeds the applicable limit.
• A parameter module that was opened fails patient-leakage testing.
• A safety failure cannot be corrected or isolated.
• The monitor cannot reliably perform its intended monitoring and alarm functions.

The manual directs removal from operation when a safety-test failure cannot be corrected.

Use the manufacturer service manual, facility policy, and approved AEM program to determine the final PM interval and return-to-service requirements.