The CapStar End-tidal CO2 Analyzer comes complete with accessory pack, 110/220V operation.The built-in large digital display shows CO2 concentration in % or mmHg, and allows breath-by-breath peak end-tidal reading or continuous rapid response to changing CO2. This unit is the natural companion for the SAR-830 series of small animal ventilators.


Standard Features:
  • End-tidal peak or continuous readings
  • Low sample flow requirements
  • Accurate and stable monitoring
  • Linear output signal for recording
The CAPSTAR-100 Carbon Dioxide Analyzer provides continuous measurement of expired CO2 over the range 0-10 percent. Its rapid response time, small sample flow requirements, and long-term stability make it ideal for respiratory gas measurement of rodents and larger animals.
The heart of the instrument is a miniature infrared analyzer with exceptional stability, low maintenance, and a linear output. The heated measurement cell prevents water condensation. The SENSORPOD, which contains the infrared measurement cell, attaches to the front panel by a 1.5m cable. This cell can be removed for cleaning, inspection, or replacement in minutes. The digital display shows CO2 concentration in percent or mmHg, and allows breath-by-breath peak end-tidal reading or continuous rapid response. Calibration is performed with a single calibrated gas and room air.
The reliability and ease of operation of the CAPSTAR-100 make it the perfect instrument for routine respiratory CO2 monitoring. It is the natural companion to our SAR-830 series Small Animal Ventilators for monitoring respiratory status. With the AVS-1 Advanced Ventilator System, it can control end-tidal CO2. It can also be used to monitor unassisted animals. Gas sampling rates of less than 30ml/min can be used, making it possible to monitor animals as small as rats. The fast response time of the CAPSTAR-100 allows end-tidal response plateaus with respiratory rates of 120 breaths/min or greater.
A range of accessories is available to ensure easy setup and convenient operation. An accessory pack containing sample tubing, moisture traps, and Nafion moisture- absorbing sample tubes is included with the instrument.


  • Respiratory monitoring
  • Use with ventilated or unassisted animals
  • Suitable for rats and larger animals
  • CO2 control with AVS-1 Ventilator



Analyzer Type

Single Beam Infrared
Sample Cell Materials
Sapphire And Stainless Steel
Sample Inlet Connector
0.062” OD Brass Tube
Recommended Sample Tubing Size
0.040" - 0.062" ID Tygon™
Measurement Range
0-10% CO2
Analog Output Scaling
100mv/% CO2 (0-1V)
0.1% CO2
0.1% CO2
Response Time (T10 - T90)
100ms At 100 Ml/Min Sampling
Response Time (T10 - T90)
130ms At 50 Ml/Min Sampling
Response Time (T10 - T90)
250ms At 30 Ml/Min Sampling
Zero Stability
0.1% (8 Hours), 0.2% (24 Hours)
Operating Temperature Range
5 - 40 °C
Optical Bench Temperature
48 °C, Temperature Controlled
Warm-Up Time
5 Min To 0.2%, 10 Min To 0.1%
Sample Rate Flowmeter
10 - 50 Ml/Min
Maximum Sample Cell Pressure
+5 Psig
Interference Effects: Vaporized Anesthetic Agents
Interference Effects: 50% N2O
0.1% At 0% CO2, 0.6% At 5% CO2 (Uncompensated)
Nitrous Oxide Compensation (Internal Jumper For 25, 50, 75%)
0.1% At 5% CO2
Zero, Span (10-Turn Dials)
Electrical Requirements
120VAC/220VAC Switchable, 35VA
Dimensions (Main Unit)
9W X 5H X 9D In., 23W X 13H X 23D Cm
Dimensions (SENSORPOD)
3W X 2.5H X 3D In., 7.6W X 6.4H X 7.6D Cm
10 Lbs (4.5kg)

CapStar CO2 Analyzer

SKU: 11-10000