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GMP231 catalogue
Incubator CO₂ Probe GMP231
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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
| Specification | GMP231 |
|---|---|
| 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
| Condition | GMP231 specification | Practical 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
| Influence | GMP231 capability | Why 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
| Specification | GMP231 |
|---|---|
| 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 point | GMP231 | GMP251 | GMP80P 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
| Issue | Possible effect | Recommended 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.
15 other products in the same category:
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
- Optional HUMICAP® relative-humidity measurement from 0 to 95 %RH
- Voltage, current or Modbus RTU output models
- Display and CO₂ status-indicator options
- Field-exchangeable calibrated measurement modules
- Traceable three-point CO₂ calibration certificate included
The Vaisala Indigo500 Series provides flagship industrial measurement integration: choose Indigo510 for a simplified single-probe system or Indigo520 for full dual-probe capability.
- Indigo510: one probe and two isolated analog outputs
- Indigo520: two probes, four isolated outputs and two relays
- Ethernet web interface and Modbus TCP communication
- Rugged IP66 and NEMA 4 metal enclosure
The Vaisala GMD110 measures carbon dioxide directly inside ventilation ducts for precise HVAC control and demand-controlled ventilation.
- CO₂ measurement range from 0 to 10,000 ppm
- Accuracy of ±40 ppm from 0 to 3000 ppm
- 4–20 mA, 0–5 V, 0–10 V or Modbus RTU output options
- 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
- IP65 enclosure for demanding duct installations
- Traceable calibration certificate included
The Vaisala GMW80 Series provides dependable, cost-efficient room measurement for demand-controlled ventilation and indoor air-quality applications.
- CO₂ measurement ranges up to 2000 or 5000 ppm, depending on model
- Temperature measurement from 0 to +50 °C on selected models
- Optional relative-humidity measurement from 0 to 95 %RH
- Voltage, current, relay, Pt1000 and Modbus RTU options
- Display or colour CO₂ indicator available on selected models
- Stable Vaisala CARBOCAP® technology for continuously occupied buildings
- Quick installation with correct CO₂ readings immediately after start-up
The Vaisala GM70 was a portable carbon-dioxide meter for diffusion measurements, pump sampling, data logging and field checking fixed CO₂ instruments.
- Discontinued product; not recommended for new purchases
- GMP221 probes for percentage-level CO₂ up to 20%
- GMP222 probes for ppm-level CO₂ up to 10,000 ppm
- GMH70 diffusion handle or GM70PUMP sampling system
- MI70 indicator with numerical, graphical and logging functions
- Used for field checking compatible fixed Vaisala CO₂ instruments
- Use Vaisala Indigo80 for new portable measurement systems
The Vaisala VDL200 is a secure Power-over-Ethernet data logger for monitoring temperature, relative humidity, carbon dioxide and analog or Boolean inputs in controlled and GxP-regulated environments.
Designed for the Vaisala viewLinc Continuous Monitoring System, the VDL200 combines interchangeable smart probes, onboard memory and battery backup to provide reliable, gap-free environmental monitoring.
The Vaisala MGP262 continuously measures methane slip and carbon dioxide in offgas from biomethane-upgrading processes. Its in-situ design provides direct, always-on measurement without a separate sampling system.
- Optimised for low-level methane measurement in CO2-rich offgas
- CH4 measurement range from 0–5 vol-%
- CO2 measurement range from 0–100 vol-%
- Heated optical measurement for demanding and humid process conditions
- Three isolated 4–20 mA outputs and RS-485 Modbus RTU
- Ex-certified construction for direct installation in hazardous process areas
The Vaisala Indigo200 Series is the standard transmitter platform for one interchangeable Indigo-compatible smart probe, providing local display and practical automation-system connectivity.
- Indigo201 with three analog outputs and two relays
- Indigo202 with Modbus RTU and two relays
- Colour display with numerical and graphical views
- IP65 enclosure for industrial measurement applications
The Vaisala MGP261 measures methane, carbon dioxide and humidity directly in raw biogas. Its in-situ design avoids a separate sampling system and helps operators monitor gas quality while protecting downstream equipment.
- Measures CH4, CO2 and water vapour in one probe
- 0–100 vol-% measurement range for methane and carbon dioxide
- Humidity output as 0–25 vol-% H2O or −10 to +60 °C dew point
- Heated optics help prevent condensation in wet biogas
- Three isolated 4–20 mA outputs and RS-485 Modbus RTU
- Ex-certified construction for direct installation in hazardous process areas
The Vaisala GMD20 Series was designed for carbon-dioxide measurement inside ventilation ducts and demand-controlled ventilation systems.
- Discontinued legacy product; not recommended for new projects
- Nominal CO₂ measurement range from 0 to 2000 ppm
- GMD20 without display and GMD20D with local display
- 0–20 mA, 4–20 mA and 0–10 V analogue outputs
- Optional relay or LonWorks® interface on applicable configurations
- IP65 electronics enclosure for duct installations
- Use Vaisala GMD110 for new installations
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.
- Selectable CO₂ ranges from 0–1000 ppm to 0–2%
- Diffusion-aspirated or flow-through sampling models
- Accuracy up to ±(3 ppm + 1% of reading)
- Temperature, pressure, humidity and oxygen compensation
- RS-232, RS-485, 4–20 mA, 0–2.5 V or 0–5 V outputs
- Raw and numerically filtered measurement data
- IP67 probe housing with the cable connected
- Compatible with MI70 for portable display and logging
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.
Its corrosion-resistant IP66 metal enclosure, flexible probe mounting and interchangeable probe design make Indigo300 suitable for humidity, temperature, dew point, CO2, moisture in oil and other demanding industrial measurements.
The Vaisala RFL100 uses secure, long-range VaiNet wireless technology to monitor temperature, relative humidity and carbon dioxide with the AP10 Access Point and viewLinc Continuous Monitoring System.
- At least 50 m typical indoor wireless range
- Up to 32 RFL100 data loggers per AP10
- 30 days of local measurement memory
- Approximately 18 months of battery operation for temperature and humidity monitoring
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
- Standalone Modbus RTU operation or connection to an Indigo transmitter
- Compatible with Vaisala Indigo80 and Insight PC software
- IP65 probe body with traceable calibration certificate
The Vaisala GMP252 is an intelligent standalone probe for stable ppm-level carbon-dioxide measurement in demanding HVAC, refrigeration, agriculture and industrial applications.
- 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
- Compatible with Vaisala Indigo80 and Insight PC software