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Manual Reference
SunTech Medical Tango+ User Guide, part 80-0001-06; Tango+ Service Manual, part 80-0002-01 Rev A.
Manufacturer Recommendation / AEM Status
SunTech recommends checking Tango+ calibration annually. The service manual also recommends annual checks of calibration and the basic patient-safety systems. Manufacturer-listed routine maintenance covers pressure-calibration verification, pneumatic leak rate, safety timeout, and overpressure release. Inspect the monitor, cables, and pneumatic hoses routinely and replace damaged items immediately.
The user guide states that the monitor has no user-serviceable internal parts and should be opened only by an authorized service representative. If pressure verification fails, remove the monitor from service for qualified calibration or repair, then repeat verification. After authorized reassembly, perform the leak-rate and timeout tests.
If a facility changes the manufacturer-listed interval or activities, that should be handled under its approved AEM program, risk assessment, maintenance history, and applicable regulatory requirements.
What This PM Procedure Covers
- Identity, configuration, history, labels, housing, mount, external power supply, and accessories
- Patient cable, pneumatic hoses, Orbit-K cuff/microphone, ECG connections, and optional SpO2
- Startup self-check, zero-pressure display, controls, indicators, and stress-system interface
- Annual pressure accuracy, leak rate, timeout, and overpressure safety tests
- Cleaning, configuration-appropriate electrical safety, restoration, and documentation
Required Tools and Equipment
- Current Tango+ user and service manuals
- Calibrated electronic manometer or equivalent
- 500 mL volume, or an Orbit-K Adult Plus cuff wrapped around a nonbreakable/noncrushable object; never use glass
- Hand inflation bulb with bleed valve
- Tubing, tee fittings, and connectors, or SunTech T-tube kit 98-0030-00
- Calibrated stopwatch
- Known-good configuration-appropriate cuff, K-sound microphone/patient cable, ECG/interface cable, and optional SpO2 sensor as needed
- Soft cloth and manufacturer-compatible cleaning/disinfection materials
- Electrical safety analyzer suitable for the verified equipment classification when required
Step-by-Step PM Procedure
1. Verify Identity and Configuration
Action: Record asset tag, serial number, exact Tango+ configuration, power-supply rating, host stress system, internal or external ECG source, patient cable, cuff sizes, and optional SpO2 hardware. Confirm that the manuals and tests apply to Tango+, not Tango M2.
Expected outcome: The asset matches CMMS and the correct configuration, accessories, power supply, and source documents are identified.
2. Review History and Prepare Safely
Action: Review inaccurate-reading, cuff-inflation, pneumatic leakage, timeout, overpressure, communication, self-test, impact, liquid, and repair history. Remove the monitor from patient use, disconnect accessories as needed, and set up on a stable dry surface.
Expected outcome: Known concerns are identified and the monitor is safely available for testing.
3. Inspect Housing, Mounting, and Labels
Action: Inspect the enclosure, display lens, keypad, feet, pole/rail mount, fasteners, labels, connectors, and openings for cracks, looseness, deformation, contamination, missing parts, impact evidence, or liquid ingress. Do not open the enclosure during routine PM.
Expected outcome: The monitor and mount are clean, secure, legible, and free of safety-affecting damage or ingress.
4. Inspect Power Components
Action: Inspect the approved external medical-grade power supply, mains cord, low-voltage cable, plugs, pins, strain reliefs, and monitor connection. Verify label compatibility and check for cuts, exposed conductors, looseness, heat damage, or unauthorized substitution.
Expected outcome: All power components are correct, intact, secure, and free of electrical or mechanical damage.
5. Inspect Patient and Interface Accessories
Action: Inspect the pneumatic/K-sound patient cable, hoses, connectors, Orbit-K cuff, bladder, sleeve, K-sound microphone, ECG cables, stress-system interface cables, and optional SpO2 components. Check for cracks, fraying, kinks, leaks, contamination, bent contacts, poor retention, or damaged cuffs/sensors.
Expected outcome: All required accessories are compatible and serviceable, with damaged items replaced before use.
6. Clean the Monitor and Accessories
Action: Disconnect the power supply. Wipe the monitor with a soft damp cloth to remove surface dust and dirt. Do not sterilize or immerse the monitor and do not clean it with liquid detergents, cleaning agents, or solvents. Clean cuffs, ECG cables, and optional SpO2 components only by their user-guide instructions and dry completely.
Expected outcome: The monitor and reusable accessories are clean, dry, and undamaged without prohibited chemical or liquid exposure.
7. Verify Startup Self-Checks and Controls
Action: Connect the approved supply and power on. Observe startup, display, status messages, measurement-mode indication, keypad response, and audible indication. Confirm no diagnostic self-test failure or persistent error is present.
Expected outcome: Startup completes normally, the correct mode is displayed, controls and indicators respond, and no unresolved fault remains.
8. Verify Zero-Pressure Indication
Action: With no cuff attached and no pressure applied, observe the displayed cuff pressure. The user guide warns not to use the monitor if it shows greater than zero pressure with no cuff attached.
Expected outcome: The monitor displays 0 mmHg with no cuff attached.
9. Verify Configured Communication and Accessories
Action: Using known-good components and the facility's approved non-patient setup, verify the configured ECG trigger/heart-rate input, communication with the host stress system, patient-cable connection, and optional SpO2 response when fitted. Do not perform a PM test on a patient.
Expected outcome: All clinically required configured inputs, outputs, and accessories communicate and respond normally.
10. Perform Annual Pressure-Calibration Verification
Action: Connect a calibrated electronic manometer, approved 500 mL volume or supported Orbit-K Adult Plus cuff, inflation bulb, and tee fittings. Never use a glass volume. Enter Verify Calibration through Monitor Setup and compare the reference with the Tango+ display throughout 0-300 mmHg.
Expected outcome: The displayed pressure remains within ±2 mmHg of the calibrated reference throughout the range. A failure requires qualified calibration/service and repeat verification.
11. Perform the Pneumatic Leak-Rate Test
Action: Using the service-manual pneumatic setup, stabilize the system near 250 mmHg, note the exact pressure, and start the stopwatch. After 60 seconds, record the pressure loss, then release pressure through the approved control.
Expected outcome: Pressure decreases by no more than 2 mmHg in 60 seconds.
12. Perform the Safety-Timeout Check
Action: With the 500 mL volume and bulb connected, use Verify Calibration as directed. Rapidly pressurize to approximately 200 mmHg. Start timing as pressure rises through 10 mmHg and stop as the automatic release falls through 10 mmHg. Reset the Tango+ as directed after the test.
Expected outcome: Automatic release occurs in 160-180 seconds.
13. Perform the Overpressure Check
Action: With the approved pneumatic setup, apply 280 mmHg, then increase pressure slowly until the Tango+ opens its valves and releases pressure. Reset the unit as directed after the test.
Expected outcome: Overpressure release occurs between 290 and 320 mmHg.
14. Perform Configuration-Appropriate Electrical Safety
Action: Verify the equipment and external-supply labels before selecting tests. Inspect polarity/insulation and perform facility-required touch/enclosure leakage and applicable patient-connection tests. For a verified Class II configuration, protective-earth resistance is normally not applicable. Record the analyzer, standard, mode, limits, readings, and result.
Expected outcome: All tests appropriate to the verified configuration meet the facility's adopted criteria without applying a Class I ground test to Class II equipment.
15. Restore, Recheck, and Document
Action: Exit test screens, release all pressure, remove test fittings, reconnect approved accessories, and repeat startup, 0 mmHg, control, communication, and configured-accessory checks. Clean/dry the setup and document readings, failures, corrective work, and disposition.
Expected outcome: The Tango+ is complete, clean, depressurized, fully functional, and either returned to service with complete records or clearly removed from service.
Electrical Safety Testing
Verify the exact label and approved external power supply before selecting tests. Document analyzer/standard, equipment class, power-component inspection, protective-earth result or N/A, touch/chassis leakage measured in microamps, applicable patient-connection testing, facility limits, and pass/fail. The reviewed manuals do not provide one routine leakage-current acceptance limit, so this procedure does not invent one. Use the facility's current adopted standard for the exact configuration.
Pass / Fail Criteria
Pass
- Identity, configuration, history, labels, enclosure, mount, power supply, cables, hoses, cuff/microphone, controls, display, and accessories pass
- Startup/self-check completes, correct mode appears, and the monitor reads 0 mmHg with no cuff attached
- Configured stress-system communication, ECG trigger/heart-rate input, patient cable, and optional SpO2 pass
- Pressure indication remains within ±2 mmHg of the calibrated reference from 0-300 mmHg
- Leak loss is no more than 2 mmHg in 60 seconds near 250 mmHg
- Safety timeout releases in 160-180 seconds and overpressure releases from 290-320 mmHg
- Cleaning, configuration-appropriate electrical safety, final restoration, and documentation are complete
Remove From Service
- An unresolved self-test/error condition exists or pressure is greater than zero with no cuff attached
- Enclosure, mount, label, power supply, cable, hose, cuff, microphone, connector, control, display, interface, or optional sensor has a safety-affecting defect
- Liquid ingress, severe impact, unauthorized modification, or evidence requiring internal evaluation exists
- Pressure accuracy, pneumatic leak, safety timeout, overpressure release, configured communication, or electrical safety fails
- Qualified calibration, repair, or internal service is required and cannot be completed under current authorization
Copy/Paste CMMS Work Order Procedure
Use the current SunTech Medical Tango+ user/service documentation, facility policy, and approved AEM program to determine the final PM interval and return-to-service requirements.