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T: 514-354-2511
T: 1 800 463-4363
F: 514-354-6948
Respiration monitor

Respiration monitor

Product Code:Gemini

Need more Info? (514) 354-2511 - 1-800-463-4363

Respiratory gas measurement has long been known to be an excellent indicator of respiratory status, for both spontaneously breathing and artificially ventilated animals. The GEMINI Respiratory Monitor measures breath-by-breath oxygen and carbon dioxide concentration for accurate respiratory status assessment. The instrument uses the latest technology fast infrared (CO2) and paramagnetic (O2) measurement cells for unsurpassed accuracy and long-term stability. Respiratory rate is computed using the normal inspiration/expiration excursion of the CO2 signal. Adjustable CO2 and respiratory rate alarms are standard. Linear voltage outputs are provided for both gasses and respiratory rate, and a standard RS232 serial port provides data for external monitoring or collection on a computer.

The measurements and computed results are reported directly on the front-panel backlit LCD display. High/Low alarm settings are individually adjustable, and are stored in non-volatile memory. These settings are restored when the unit is next used. Indicator lights and and an audible signal provide status indicators for proper system operation. Measurements can be displayed as continuous (fast) or peak end-tidal readings.

Easy setup and operation

Typical operation requires only simple setup. The small diameter sample tubing is connected to the animal's endotracheal tube using the supplied fittings. All alarm settings are adjusted with a single knob. Alarm lights are always active, but an audible alarm can be switched on or off as desired. The gas and rate outputs are standardized for easy external recording. The RS232 port provides simple ASCII formatted data that can be received using any communications software, and easily imported into a spreadsheet for calculation.

The only maintenance required is periodic inspection or replacement of the supplied moisture filters. Special input tubing includes a Nafion® membrane that automatically dries the sample gas for long, trouble-free monitoring. A miniature in-line hydrophobic filter prevents water from entering the analyzer.


The GEMINI monitor includes an open slot for use with any SYSTEM 1000 instrumentation module. Available modules include a cardiotachometer (Model CT-1000), blood pressure amplifiers (Model PM-1000) and many other signal acquisition and processing functions. A plethysmographic respiration module (Model RR-1000) uses closed-chamber pressure changes to monitor respiratory rate for very small animals.


  • Oxygen
  • Carbon Dioxide
  • Respiratory rate


Oxygen analyzer type paramagnetic
Linearity (0 - 100%) ±0.1% O2
Repeatability < 0.01% O2 /hour
Zero stability ±0.1% O2 /day
Zero stability ±0.2% O2 /month
Response time <200 mS
Operating temperature 0 - 65°C
Maximum pressure 15 psi
Maximum sample flow 250 ml/min
Instrument measurement range 0 - 100% O2
Carbon Dioxide analyzer type single-beam infrared
Operating range 0 - 10% CO2
Linearity (full scale) 1% FS
Zero drift 0.1% (8 hours), 0.2% (24 hours)
Sensor cell temperature controlled at 48°C
Warm-up time <5 min
Maximum sample flow 250 ml/min
Instrument measurement range 0 - 10.0% CO2
Respiratory Rate measurement range 10 - 600 breaths/min
Respiratory Rate alarm range 9 - 599 breaths/min
CO2 alarm range 1.0 - 9.9%
Analog outputs O2, CO2, Respiratory Rate
Analog signal outputs (rear panel) BNC jacks
Respiratory Rate output 10mV/br/min
O2 output 100mV/% O2
CO2 output 100mV/% CO2
Serial data output format 9600 baud, 8 data bits, no parity, 1 stop bit
Serial data interval complete set of readings sent 1 per breath, or 1 per minute
Serial output connector (rear panel) DB9 male
Dimensions, main unit 19W x 5.25H x 12D in.
Dimensions, expansion module 2.75 x 5.0 inches (SYSTEM 1000 standard)
Power requirements 120/240V (switchable), 100VA


Cat. No. Description
14-10000 GEMINI Respiratory monitor: Measure O2, CO2, and resp rate
10-06000 CT-1000 Cardiotachometer plug-in module: Direct connect ECG measurement
10-03000 PM-1000 Transducer amplifier plug-in modul:e Arterial BP measurement
10-04100 TXRR Medical-type blood pressure transducer: Economical arterial BP transducer
10-04210 TC-GRA Required adapter cable for TXRR
10-16000 RR-1000 Plethysmographic resp. rate monitor: Respiration monitor for mice and rats
11-20110 Rat cage Measurement chamber, approx. 2.5 liter: For rats and similar size animals
11-01108 Filter Miniature in-line hydrophobic sample filter: Prevents water from entering analyzer
11-01103 BCI-1128 Nafion sample line, 2' : Membrane tubing dries input sample


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