Huntleigh Dopplex D900
Huntleigh · Model Dopplex D900
Non-directional waveform output. Clear audio sounds of blood flow or fetal heart. Enhanced battery management. Compatible with the complete range of vascular probes. Obstetric capability (audio only). When used with EZ8 probe, it is excellent for the infrequent user in locating brachial and pedal arteries. Range of eight probe options with probe coding. Built in loudspeaker and output for headphones. Auto shut off and active noise reduction. 3 level waveform calibration function.
Key tips
- ·A no-signal/flatline alarm gets checked on the patient first, not the monitor - rule out a real clinical event before troubleshooting.
- ·Recalibrate NIBP against a reference manometer, not just a self-test pass.
- ·Reused patient cables (SpO2, ECG leads) are a common source of intermittent-fault complaints - swap the cable before the module.
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.
No or weak Doppler audio
HighSymptoms: No or faint flow / heart tones, poor signal even with good gel and placement.
Root cause: Degraded or cracked probe crystal, insufficient gel, or a probe-cable fault.
Intermittent signal with cable movement
MediumSymptoms: Audio cuts out when the probe cable is flexed.
Root cause: Broken conductors in the probe cable.
Battery / power fault
MediumSymptoms: Will not power on, short battery life.
Root cause: Depleted or aged battery.
Speaker / output fault
MediumSymptoms: No sound from the speaker but a headphone works, or distorted audio.
Root cause: Speaker or audio-amplifier fault.
Probe connector fault
LowSymptoms: Probe not detected, static.
Root cause: Worn probe connector.
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.
Doppler probe (per frequency)
Class Periodic replacementRel. cost $$R&R Easy
Probe cable / connector
Class Periodic replacementRel. cost $$R&R Fairly easy
Battery
Class Frequent wear itemRel. cost $R&R Easy
Speaker / audio amplifier
Class Major service partRel. cost $R&R Moderate
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Doppler probe (per frequency) | Periodic replacement | $$ | Easy |
| Probe cable / connector | Periodic replacement | $$ | Fairly easy |
| Battery | Frequent wear item | $ | Easy |
| Speaker / audio amplifier | Major service part | $ | Moderate |
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.
- ·Routine cable and lead-wire inspection for fraying/wear
- ·Battery conditioning cycle
- ·NIBP calibration check against a reference manometer
- ·ECG / SpO2 accuracy verification against a patient simulator
- ·Annual electrical safety test
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: No or weak audio
- Apply fresh coupling gel and confirm probe placement / angle.
- Test the probe on a known-working unit.
- Flex the cable while listening for dropouts.
- Inspect the probe face for cracks.
- Replace the probe if a known-good unit still gives no signal.
Symptom: Signal cuts with cable movement
- Flex the cable along its length and at both ends.
- Inspect the connector for damage.
- Clean and reseat the connector.
- Replace the probe if the fault tracks the cable.
- Confirm a stable signal.
Technical Specs
- Height
- 5.5 in
- Length
- 1.1 in
- Weight
- 10 oz
- Width
- 2.9 in
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- ICU / CCU
- Emergency Department
- OR / PACU
- General med-surg floors
- Step-down units
- Telemetry units
Documents & Manuals
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