RespSense® II

RespSense® II Specifications

Print Specs

Capnography Specifications

Respiration Range: 0 to 99 respirations/minute
Respiration Accuracy1, 2:
3 to 50 respirations/min ± 2
51 to 60 respirations/min ± 3

Test method summary: To determine the rated respiration rate, calibrated CO2 gas tanks are used as the respiration rate is changed from 3 to 60 BrPM.

EtCO2/CO2 Range: 0 to 99 mmHg (0 to 13.2 kPa)
EtCO2/CO2 Accuracy:
±0.2 kPa / ±2 mmHg, +8% of reading3
525 – 795 mmHg (700 – 1060 hPA)
(EtCO2/CO2 reading reaches its steady state accuracy within 10 minutes after power up. From maximum storage temperature, monitor reaches steady state accuracy 19 minutes after power up.)

Calculated Update Frequency: Once every breath (“NO BREATH” alarm after 30 seconds)
Sampling Rate: 4 Hz (4 times per second)
Total System Response Time: <7 seconds (includes delay time and rise time)
Drift of Measurement: Within CO2 accuracy specifications for 6 hours of continuous monitoring
Measurement: Automatic barometric pressure compensation and CO2 temperature compensation

1 There is no known adverse effect on performance due to cyclical pressure up to 10 kPa.
2 There is no degradation in EtCO2 measurement accuracy as a function of BrPM and inspiratory/expiratory (I/E) time ratio.
3 Presented concentration of CO2 and EtCO2 can be false, indicating a high presence of nitrous oxide and other interfering gases.

The table below shows the CO2 and EtCO2 concentration corrections. Only use agents listed in the table below.

Agent Concentration Correction of Presented CO2 to Real Concentration
50 – 70% N2O Presented CO2 x 0.75 = Actual CO2
30 – 50% N2O Presented CO2 x 0.85 = Actual CO2
0 – 30% N2O No correction

System Specifications

Power Data:
Power Supply: 100 – 240 VAC 50 – 60 Hz
Power Consumption:
3.6 W with battery operation
9 W with power supply
Input: 12 VDC, 1.5 A

Internal Battery:
Type: Lithium Ion (Li-Ion) internal battery, non-field replaceable, rechargeable
Battery Capacity: Approximately 5 hours
Charging Time: Approximately 9 hours

Dimensions: 200 x 135 x 50 mm (7.9 x 5.3 x 2 in.)
Weight: 865 grams (1.9 pounds)
Memory: 36 hours (assuming continuous operation)
Operating: 0 to 40 °C (32 to 104 °F)
Storage/Transportation: -40 to 70 °C (-40 to 158 °F)
Time (from storage) for monitor to be ready for its intended use:
10 minutes to warm from -40 to 0 °C
19 minutes to cool from 70 to 40 °C

Applied part temperature will not exceed 41°C as measured during a controlled environment test.

Operating: 15% to 93% noncondensing
Storage/Transportation: Up to 93% noncondensing

Operating: Up to 2,740 meters (9,000 feet)
Atmospheric Pressure: 525 to 795 mmHg (700 to 1060 hPa)

Pump Flow: 75 ml/min (minimum sample flow rate: 60 ml/min)
Flow Accuracy: ±15 ml/min

High and Medium Priority Alarms (at 1 m):
Sound Pressure Level: 74.6 to 75.5 dB

Classification per ANSI/AAMI ES60601-1 and CAN/CSA-C22.2 No. 60601-1:
Type of Protection: Internally powered class II (with power supply)
Degree of Protection: Type BF-Applied Part
Mode of Operation: Continuous
Enclosure Degree of Ingress Protection: IP22

RespSense® II Troubleshooting


A. Prior to turning on the monitor:

  1. Insert the filter into the trap.
  2. Insert the trap and filter into the monitor – insert the top of the trap first, then snap in bottom. (Look for the numbers 1 and 2 embossed on the monitor in the area where the trap inserts.)

B. Turn on the monitor.

  1. Disable audible alarms by pressing the ‘NO ALARM’ icon on the start-up screen.
  2. After starting the monitor and pump is running (about 15 seconds), you will see ‘WARM UP’ then ‘NO BREATH’ displayed.

C. Verify that trap and filter are seated properly

  1. Hold your finger over the trap inlet where the cannula connects. After a few seconds, the pump will slow and you will get an ‘OCCLUSION’ display.
  2. Release your finger and the monitor is ready. This indicates that the trap and filter are positioned correctly. (Skip to Section II.)
  3. If, after 5-10 seconds, ‘NO BREATH’ is still displayed, the filter is not seated properly. After re-seating the trap and filter, repeat Step 1 above. If again this does NOT show an ‘OCCLUSION’ alarm, then there may be trouble with the unit. (Proceed to Section D below.)


D. Checking the monitor

  1. With the unit running remove the trap and filter and place your finger over the small hole in the recessed area of the monitor. The monitor’s pump will stop running.
  2. Restart the pump by pressing the red ALARM/RESET button with your finger still over the hole.
  3. If the pump restarts and displays OCCLUSION followed by ‘TRAP FULL/PUSH ALARM’ the monitor is working properly. Change filters and try to insert the trap and filter again. If the pump restarts and runs without ‘TRAP FULL/PUSH ALARM’ displayed, then the monitor is not functioning properly. Contact Nonin Technical Service.



A. Occlusion indication during operation

  1. If the monitor occludes, ‘TRAP FULL/PUSH ALARM’ will be displayed.
  2. Reset the monitor up to two (2) times by pressing the ALARM/RESET button.
  3. If the monitor occludes again, the pump will run for several seconds then shut off and display ‘OCCLUSION’ followed by ‘TRAP FULL/PUSH ALARM’.
  4. To determine if the occlusion is in the cannula or the filter/trap combination, disconnect the cannula from the trap (Luer connector) and press the ALARM/RESET button. .

If the monitor restarts and runs properly for 10-15 seconds, then the occlusion is in the cannula and the cannula should be replaced. If the unit occludes and shows the ‘TRAP FULL/PUSH ALARM’ the occlusion is in the filter. Replace the filter and restart the monitor by pressing the ALARM/RESET button.


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