Incubator CO₂ Probe GMP231 Incubator CO₂ Probe GMP231
Incubator CO₂ Probe GMP231

Vaisala GMP231 CO₂ Probe for Incubators

Vaisala GMP231 CO₂ Probe for Incubators

The Vaisala GMP231 is an OEM carbon-dioxide probe designed for accurate measurement and permanent wall installation in life-science incubators.

  • CO₂ measurement range from 0 to 20%
  • Measurement performance optimized around 5% CO₂
  • Sensor head withstands heat sterilisation at +180 °C
  • At least 120 specified +180 °C sterilisation cycles
  • Internal temperature and pressure measurement for compensation
  • Heated sensor head helps prevent condensation
  • I²C, Vaisala RS-485 protocol and scalable 0–20 mA options
  • Four-point traceable CO₂ calibration certificate included

Purpose-Built CO₂ Measurement for Life-Science Incubators

The Vaisala GMP231 is designed specifically for incubator manufacturers and equipment integrators. It installs through the incubator wall so the CARBOCAP® sensor head is exposed to the chamber while the electronics remain outside and thermally isolated.

This construction allows the probe to remain installed during high-temperature sterilisation, reducing the need to remove and separately decontaminate the sensor. The measurement is optimized around the common 5% CO₂ incubator setpoint while covering concentrations from 0 to 20% CO₂.

Incubator-specific design: Select GMP231 when the probe must be integrated through an incubator wall and remain in place during +180 °C heat sterilisation. For a general-purpose percentage-level probe with analogue, Modbus RTU and Indigo-transmitter options, review the Vaisala GMP251.

GMP231 Measurement Performance

SpecificationGMP231
Measurement range 0 to 20% CO₂
Optimized measurement point 5% CO₂
Calibration uncertainty at 5% CO₂ ±0.1% CO₂
Repeatability from 0 to 8% CO₂ ±0.1% CO₂
Repeatability from 8 to 12% CO₂ ±0.2% CO₂
Repeatability from 12 to 20% CO₂ ±0.4% CO₂
Non-linearity from 0 to 20% CO₂ ±0.1% CO₂
Start-up time Less than 20 seconds
Warm-up time for full specification Less than three minutes
Response time Less than 30 seconds, T63; less than 50 seconds, T90
Sensor technology Vaisala CARBOCAP® non-dispersive infrared sensor

The repeatability and compensation specifications are defined at controlled reference conditions. Evaluate the complete uncertainty requirement for the incubator, including calibration uncertainty, long-term stability, compensation and gas-distribution effects.

Heat Sterilisation and Operating Limits

ConditionGMP231 specificationPractical requirement
Normal CO₂ measurement 0 to +70 °C Measurement electronics operate outside the incubator wall
Heat sterilisation Sensor head withstands +180 °C Probe must be in standby mode and installed according to Vaisala instructions
Maximum standby durability Sensor head up to +195 °C This is a durability limit, not a normal measurement temperature
Specified sterilisation endurance At least 120 cycles at +180 °C Record sterilisation exposure as part of the equipment maintenance history
Operating humidity 0 to 100%, non-condensing Heated optics reduce condensation risk during normal powered operation
Operating pressure Below 1500 hPa Configure pressure compensation to match the actual chamber condition

Temperature, Pressure and Background-Gas Compensation

InfluenceGMP231 capabilityWhy it matters
Temperature Internal temperature measurement and compensation Incubator measurement normally occurs close to +37 °C but varies during recovery and operation
Pressure Internal pressure measurement with compensation from 500 to 1100 hPa CO₂ gas density and indicated concentration change with atmospheric pressure
Humidity Water-vapour compensation from 0 to 100 %RH Incubators operate at high humidity, which changes the dry-gas fraction
Oxygen Configurable compensation from 0 to 90% O₂ Background-gas composition affects infrared CO₂ measurement

Pressure and temperature are measured internally for compensation. Humidity and oxygen settings must match the intended chamber conditions. Incorrect compensation values can create a systematic error even when the probe is correctly calibrated.

Electrical and Mechanical Specifications

SpecificationGMP231
Digital outputs I²C at 5 V and two-wire RS-485 with Vaisala Industrial Protocol
Analogue output Scalable 0–20 mA; maximum load 600 Ω
Supply voltage 11 to 30 V DC; 20 to 30 V DC when analogue output is used
Power consumption Less than 1 W, pulsed
Connector M12, 8-pin
Sensor-head protection IP54
Electronics-housing protection IP20
Probe-tube length Approximately 118.5 mm
Weight Approximately 150 g without cable; 200 g with cable
Probe-tube material PPSU
Filter material PTFE

GMP231, GMP251 or GMP80P?

Selection pointGMP231GMP251GMP80P with Indigo80
Main purpose Permanent OEM integration in CO₂ incubators General percentage-level CO₂ measurement Portable pump-aspirated incubator sampling
Measurement range 0 to 20% CO₂ 0 to 20% CO₂ 0 to 20% CO₂ using GMP251 measurement technology
Design point Optimized around 5% CO₂ and +37 °C Flexible measurement across the full percentage-level range Portable checks through sampling ports and tubing
Heat sterilisation Sensor head remains installed during +180 °C cycles Not designed as a permanent through-wall sterilisation probe Portable equipment is removed before chamber sterilisation
Pressure measurement Internal pressure sensor Pressure value is configured for compensation Pressure compensation is configured through the portable system
Outputs I²C, Vaisala RS-485 protocol or 0–20 mA Voltage, current, Modbus RTU or Vaisala protocol Local Indigo80 display, logging and data transfer
Best choice when The probe is built into an incubator and must survive sterilisation in place A fixed general-purpose percentage-level probe is required Technicians need portable sampling, checking or troubleshooting
Product information GMP231 is detailed on this page Explore Vaisala GMP251 Explore Vaisala Indigo80 and GMP80P

Incubator Measurement and Control Considerations

IssuePossible effectRecommended response
Poor gas mixing Probe reading does not represent the culture area Review injection point, fan operation, recovery time and sensing location
Door opening Temporary CO₂, temperature and humidity disturbance Apply an appropriate control delay and evaluate recovery performance
Incorrect pressure compensation Systematic CO₂ deviation Use the internal pressure measurement and confirm the compensation configuration
Condensation Slow recovery or unstable measurement Keep the sensor powered where appropriate and review the chamber cycle
Repeated sterilisation Long-term exposure and material ageing Track cycle count and verify the probe according to the quality plan
Controller scaling mismatch Incorrect displayed CO₂ value or control action Verify the configured 0–20 mA scale at both the probe and controller

Calibration and Verification

GMP231 is supplied with a four-point traceable CO₂ calibration certificate. Field verification or adjustment can be performed using certified reference gas and supported Vaisala service equipment. The calibration plan should reflect incubator criticality, sterilisation exposure, quality requirements and the required uncertainty.

  • Use certified gas points that represent the incubator's working range, especially around 5% CO₂.
  • Allow the chamber or calibration setup to stabilise before recording results.
  • Confirm pressure, temperature, humidity and oxygen compensation during verification.
  • Record as-found results before adjustment and as-left results after adjustment.
  • Retain reference-gas certificates, equipment identification and calibration records.
  • Investigate chamber distribution and controller behaviour when the probe passes but the process remains inconsistent.

Vaisala GMP231 Supplier and Technical Support in Malaysia

Seacom Process Instruments supplies and supports the Vaisala GMP231 Incubator CO₂ Probe in Malaysia for life-science incubators, laboratory equipment and OEM chamber integration.

Our team can help review the measurement range, incubator wall arrangement, sterilisation cycle, electrical interface, analogue scaling, environmental compensation and calibration requirement. We can also help compare permanent GMP231 integration with the general-purpose GMP251 or portable Indigo80/GMP80P sampling arrangement.

Planning a GMP231 installation? Send us the incubator design, normal CO₂ setpoint, sterilisation temperature and duration, wall thickness, supply voltage, controller interface, output requirement and calibration expectations.

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  GMP231 Catalogue   (177.43k)

  GMP231 Order Form   (92.76k)


Specific References

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  • CO₂ measurement range from 0 to 10,000 ppm
  • Measurement up to 30,000 ppm with reduced accuracy
  • Accuracy of ±40 ppm from 0 to 3000 ppm
  • Compensation for temperature, pressure, humidity and oxygen
  • Heated sensor head helps prevent condensation
  • 0–20 mA, 4–20 mA, 0–5 V, 0–10 V and RS-485 output options
  • Standalone Modbus RTU operation or connection to an Indigo transmitter
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The Vaisala GMW90 Series provides stable wall-mounted carbon-dioxide and temperature measurement, with optional humidity, for demanding HVAC and building-automation applications.

  • Carbon-dioxide measurement from 0 to 5000 ppm
  • CO₂ accuracy up to ±(30 ppm + 2% of reading)
  • Temperature measurement from −5 to +55 °C
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  • Voltage, current or Modbus RTU output models
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The Vaisala GMP343 is a rugged, high-accuracy carbon-dioxide probe for outdoor monitoring, ecological research, soil respiration, plant-growth chambers and demanding OEM applications.

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  • Accuracy up to ±(3 ppm + 1% of reading)
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  • RS-232, RS-485, 4–20 mA, 0–2.5 V or 0–5 V outputs
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  • IP67 probe housing with the cable connected
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Duct Mounted CO2 Transmitter GM20

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  • Discontinued legacy product; not recommended for new projects
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  • Discontinued product; not recommended for new purchases
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  • GMP222 probes for ppm-level CO₂ up to 10,000 ppm
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  • Used for field checking compatible fixed Vaisala CO₂ instruments
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Vaisala Transmitter Indigo300

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The Vaisala Indigo300 is a rugged industrial transmitter for one Vaisala Indigo-compatible smart probe, providing local measurement display and up to three configurable analog outputs.

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Long Range Wireless Data Logger (CMS, FDA Approved) RFL100

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The Vaisala GMD110 measures carbon dioxide directly inside ventilation ducts for precise HVAC control and demand-controlled ventilation.

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  • Accuracy of ±40 ppm from 0 to 3000 ppm
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  • Analogue scaling of 0–2000, 0–5000 or 0–10,000 ppm
  • Fast response with less than two minutes to full specification
  • Heated CARBOCAP® sensor head helps prevent condensation
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Biogas Methane, Carbon Dioxide and Humidity Multigas Probe MGP261

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Ask Seacom about the MGP262

Indigo200 Series Transmitters for Vaisala smart probes for Vaisala Smart Probes

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The Vaisala Indigo200 Series is the standard transmitter platform for one interchangeable Indigo-compatible smart probe, providing local display and practical automation-system connectivity.

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CO₂ Probe GMP251

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The Vaisala GMP251 is an intelligent probe for stable percentage-level carbon-dioxide measurement in incubators, controlled-atmosphere storage and demanding industrial applications.

  • CO₂ measurement range from 0 to 20% CO₂
  • Accuracy of ±0.1% CO₂ at 5% CO₂
  • Compensation for temperature, pressure, humidity and oxygen
  • Heated sensor head helps prevent condensation
  • 0–20 mA, 4–20 mA, 0–5 V, 0–10 V and RS-485 output options
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