Certainty when it matters most.

A monitor that takes the journey with patients during their hospital stay, the Capnostream™ 35 portable respiratory monitor delivers continuous monitoring in virtually any clinical setting. 

From a patient under sedation during a procedure to monitoring a patient in the medical-surgical unit, the Capnostream™ 35 portable respiratory monitor offers quick, easy, and reliable access to respiratory status. 

The Capnostream™ 35 portable respiratory monitor provides insights on respiratory status that clinicians can use to intervene early and fast if a patient begins showing signs of respiratory compromise.


Combined with proprietary integrated algorithms and alarm and data management, the Capnostream™ 35 portable respiratory monitor provides key insights for safe and effective care.

  • Portable, rugged, lightweight, ergonomic design — helps facilitate moving a patient between hospital areas of care
  • Proprietary Molecular Correlation Spectroscopy™ technology, uses a CO2 specific infrared (IR) wavelength that is highly accurate and unaffected by the presence of other gases (e.g., O2, N2O, He or inhaled anesthetics)([FOOTNOTE=Internal test data on file.],[ANCHOR=],[LINK=])
  • Smart Capnography™ algorithms are engineered to alert clinicians to early indication of changes in respiratory status that may need intervention, while also reducing nonactionable alarms to help mitigate alarm fatigue1
  • The Integrated Pulmonary Index™ algorithm combines four real-time measures — etCO2, SpO2respiratory rate and pulse rate — to provide an inclusive assessment of a patient’s respiratory status in a single number
  • For patients who do not require capnography monitoring, a single Nellcor™ sensor offers clinicians continuous access to oxygenation, pulse rate, and respiration rate, providing a more accurate measurement than manual spot check methods††
  • Connectivity to web-enabled devices on a secured hospital Wi-Fi network is offered for advanced data management and remote patient monitoring
Order Information
Order Code Description Unit of Measure Quantity
PM35MN Capnostream™ 35 Portable Respiratory Monitor Each 1
PM35MN-RR Capnostream™ 35 Portable Respiratory Monitor with Nellcor™ Respiratory Rate Configuration Each 1
General Characteristics
Unit Dimensions 213 mm. (h) x 137 mm. (w) x 55 mm. (d) (8.385 in. (h) x 5.393 in. (w) x 2.165 in. (d)) (8.385 in. (h) x 5.393 in. (w) x 2.165 in. (d))
Unit Weight 1 kg (2.2 lb)
Power Supply
Input Voltage 100-240 V, 50/60 Hz, ± 10%
Battery Type Lithium Ion
Battery Pack Nominal Voltage and Energy 7.2V; 18.72Wh
Battery Operation 3 hours for removable battery pack; 20 minutes for internal battery pack
Battery Charging Time Up to 5 hours when the monitor is off and up to 8 hours when the monitor is on, for both batteries
Screen 109mm (4.3inch) Color TFT Display

Pixel Pitch: 0.198 (horizontal) x 0.198 (vertical) mm

Active Display Area: 95.04 (horizontal) x 53.856 (vertical) mm

Resolution 480 x 272 pixels

Viewing angle (vertical) 125°

Viewing angle (horizontal) 140°
Trace Speed 3.0, 6.3, 12.5 and 25 mm/sec
Waveform Sampling Rate 77.82 samples/sec for SpO2 (fixed)

20 samples/sec for Capnography (fixed)
Trend Storage 48 hours with 1 second resolution
Trend Display Graphical Display: 1h, 2h, 4h, 8h, 12h views

Tabular Display intervals: 1 sec, 5 sec, 15 sec, 30 sec, 1 min, 5 min, 15 min, 30 min, 1 hour
Microstream™ technology: Saturation Pattern Detection™ algorithm, Integrated Pulmonary Index™ algorithm, Apnea-Sat Alert™ algorithm, Smart Alarm for Respiratory Analysis™ algorithm

Nellcor™ pulse oximetry technology: Nellcor™ SatSeconds alarm management, Nellcor™ respiratory rate software
Communication Interface
Wi-Fi (Vital Sync ™ virtual patient monitoring platform connectivity option) and file transfer via USB flash drive

Connectivity on a secure hospital Wi-Fi network
Microstream™ Capnography
CO2 Units  mmHg, kPa or Vol%.
CO2, etCO2 Range 0-150 mmHg
CO2 Waveform Resolution 0.1 mmHg
etCO2 Resolution 1 mmHg
CO2 Accuracy 0-38 mmHg: ± 2 mmHg

39-150 mmHg: ± (5% of reading + 0.08 for every 1 mmHg above 38 mmHg)
Capnography-Derived Respiration Rate Range 0-150 bpm
Capnography-Derived Respiration Rate Accuracy 0-70 bpm: ±1 bpm

71-120 bpm: ±2 bpm

121-150 bpm: ±3 bpm
etCO2 Alarms No breath, etCO2 high, etCO2 low, RR high, RR low, IPI low

(IPI also requires pulse oximetry information)
Flow Rate 50 (42.5 ≤ flow ≤ 65) ml/min, flow measured by volume
Waveform Sampling 50 millisecond intervals
Response Time 2.95 s (typical); with use with sampling lines with long tubing, ~5.0 s
Initialization Time 60 s (typical)
Calibration Interval Initially calibrate after 1,200 operating hours, then once a year or after 4,000 operating hours, whichever comes first
Nellcor™ Pulse Oximetry PERFORMANCE
Respiration Rate Range 4-40 bpm ±1 bpm
SpO2 Measurement Range  1-100%
Pulse Rate Range 20 to 250 beats per minute

Pulse Rate values of < 20 beats per minute shall be displayed as 0 beats per minute

Pulse Rate values of > 250 beats per minute shall be displayed as 250 beats per minute.
Pulse Amplitude 0.03% to 20%
Standard and LoSat SpO2 Accuracy Range, using Nellcor™ pulse oximetry sensors:  MAXA, MAXAL, MAXP, MAXI, MAXN ±2% in the standard range of 70% to 100% saturation and LoSat SpO2 accuracy of ±3% in the range of 60% to 80% saturation, enabling clinicians to accurately assess patients’ oxygen saturation.
Pulse Rate Accuracy ±3 digits over the range of 20 to 250 beats per minute inclusive, including under low perfusion; with motion, 48 to 127 bpm ±5 digits
Alarms SpO2 High, SpO2 Low, PR High, PR Low
Nellcor™ SatSeconds Alarm Management Range Settings 10, 25, 50 and 100, or OFF
Nellcor™ Saturation Pattern Detection Alarm Sensitivity setting: 1, 2, 3 or OFF
Pulse Rate Display Settings: 5, 10 or OFF
Monitor Alarms
High Priority Alarm Beep pattern repeated every 5 seconds Flashing Red LED
Medium Priority Alarm Triple beep repeated every 10 seconds Flashing Yellow LED
Advisories Alarm No audible alarm No LED

This product is designed to conform to the following standards: 

  • IEC 60601-1 
  • IEC 60601-1-2 
  • IEC 60601-2-49 
  • IEC 60601-1-12 
  • IEC 60601-1-6 
  • IEC 60601-1-8 
  • ISO 80601-2-61 
  • ISO 80601-2-55 
  • ISO 15223-1 
  • Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC 
  • Directive on the restriction of the use of certain hazardous substances (ROHS) in electrical and electronic equipment - 2011/65/EU 
  • IEC 62133 
  • UN 38.3 
  • EN 301 489-1 V1.9.2

Order Information

Flexible Options

Flexible monitoring options so clinicians can choose what and how to monitor respiratory status.

Access continuous, noninvasive, real-time respiratory status monitoring of etCO2 and capnography-derived respiration rate using a Microstream™ Advance filter line. Or use a Nellcor™ respiratory rate sensor alone to measure SpO2, pulse rate and pulse oximetry-derived respiration rate (RRPleth).

Continuous monitoring of respiration rate, including pleth-based respiratory rate, offers an early indication of respiratory compromise compared to continuous SpO2 monitoring alone.([FOOTNOTE=Bergese SD. Multicenter Study Validating Accuracy of a Continuous Respiratory Rate Measurement Derived from Pulse Oximetry: A Comparison with Capnography. Anesth Anal. 2017; 124 (2): 1153-1159.],[ANCHOR=],[LINK=])

In addition to having the option to measure pleth-based respiration rate, the Nellcor™ Saturation Pattern Detection (SPD) algorithm identifies evolving SpO2 patterns in real-time, which can indicate repetitive reduction in airflow (RRia).  One of the more well-known examples of RRiA is obstructive sleep apnea.