Background and Identification

The Nellcor N-400 is a perinatal monitoring system with a fetal pulse oximeter. Pulse oximeters are non-invasive devices used to monitor a patient’s oxygen saturation. The Nellcor division focuses mainly on producing pulse oximeters and oxygen monitors.

The Nellcor N-400 is designed to measure the pulse rate and functional oxygen saturation of arterial hemoglobin in fetuses. The monitor can noninvasively monitor the fetus during labor and delivery. It can display pulse rates between 0 and 250 beats per minute and oxygen saturation between 0 and 100 percent.

The N-400 model’s front panel includes an ON/STANDYBY switch, a control knob, a Response Time button, an ECG Display button, an Audio Alarm Off button, and a Low Saturation Limit button. The rear panel includes DIP switches, a Mains (AC) ON/OFF switch, a Decrease (zero) button, and an Increase (full-scale) button. By default, the monitor’s audible alarms are turned off. Users can set audible and visible alarms for low pulse rates and low oxygen saturation.

For troubleshooting and repair information, see the Nellcor N-400 Service Manual. Common problems include the failure of the monitor to turn on and the inability to connect the patient module. Erratic measured values and inaccurate measured values are also common issues that are typically easily repaired.

Technical Specifications

PHYSICAL

  • Monitor
    • Dimensions: 12.6” wide x 12” deep x 3” high (32 cm x 30 cm x 8 cm)
    • Weight: 9 lb (4.1 kg)
  • Patient Module
    • Cable length: 13 ft (4 m) cable
    • Connectors: Lemo B-series, mates with 12-pin connector on N-400 front panel; Fetal Sensor connector, mates with 9-pin connector on Fetal Oxygen Senso

CONNECTORS

  • Front Panel: N-400 Fetal Patient Module Connector
  • Rear Panel:
    • FSpO2 analog output jack (3/32”)
    • Plethysmographic Waveform analog output jack (3/32”)
    • Fetal High-level ECG input jack (3/32”)
    • Serial Communications connector (9-pin, D-type connector)
    • Mains (AC) power input

ELECTRICAL

  • Voltage Requirement:
    • 100 – 120 V~ ±10% at 50/60 Hz
    • 200 – 240 V~ ±10% at 50 Hz
  • Current Requirement: 300 mA, maximum
  • Power Consumption: Maximum rating: 30 VA
  • Fuses:
    • 115 V~: 2 x T 500 mA, 250 V
    • 230 V~: 2 x T 250 mA, 250 V
  • Classification:
    • Protective Class: IEC Class I
    • Degree of Protection: Type BF
    • Enclosure Degree of Protection: Ordinary (IPXO)
    • Mode of Operation: Continuous

Additional Information

Nellcor N-400 Product Information

Nellcor Pulse Oximetry Products

Nellcor N-400 Product Page