CO₂ Probe GMP252 CO₂ Probe GMP252
CO₂ Probe GMP252

Vaisala GMP252 PPM-Level CO₂ Probe

Vaisala GMP252 PPM-Level CO₂ Probe

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

Reliable PPM-Level CO₂ Measurement

The Vaisala GMP252 is designed for applications that require accurate carbon-dioxide measurement above normal ambient conditions while remaining within a ppm-level range. Typical applications include demanding HVAC, refrigeration equipment, greenhouses, plant-growth chambers, cold storage, controlled environments and OEM equipment.

Its second-generation Vaisala CARBOCAP® sensor uses an internal reference and Microglow infrared light source for stable long-term operation. The compact probe can work independently with analogue or Modbus RTU output or connect to a Vaisala Indigo transmitter for a display, relays and additional system interfaces.

Range selection: GMP252 is the ppm-level model. Choose the Vaisala GMP251 when the process normally operates at percentage-level CO₂ concentrations up to 20%.

GMP252 Measurement Performance

SpecificationGMP252
Measurement range 0 to 10,000 ppm CO₂
Extended measurement Up to 30,000 ppm with reduced accuracy
Accuracy from 0 to 3000 ppm ±40 ppm CO₂
Accuracy from 3000 to 10,000 ppm ±2% of reading
Accuracy up to 30,000 ppm ±3.5% of reading
Typical calibration uncertainty at 2000 ppm ±31 ppm CO₂
Typical calibration uncertainty at 10,000 ppm ±105 ppm CO₂
Start-up time at +25 °C Less than 12 seconds
Warm-up time for full specification Less than two minutes
Response with standard filter Less than one minute, T90
Response in flow-through use above 0.1 l/min Approximately 30 seconds, T90

The stated accuracy applies at +25 °C and 1013 hPa and includes repeatability and non-linearity. Configure the environmental compensations correctly when temperature, pressure, humidity or oxygen differs from the reference conditions.

Environmental Compensation

InfluenceGMP252 capabilityApplication guidance
Temperature Integrated temperature measurement or configured fixed value Use active compensation where equipment temperature changes during operation
Pressure Configurable compensation from 500 to 1100 hPa Enter actual pressure when measurement accuracy matters or atmospheric pressure varies
Humidity Water-vapour compensation from 0 to 100 %RH Configure humidity for wet processes, refrigeration and greenhouse use
Oxygen Configurable background-gas compensation from 0 to 90% O₂ Use the actual oxygen concentration for unusual gas mixtures

Incorrect environmental settings can create measurement error even when the probe itself is correctly calibrated. Record the compensation values during commissioning and review them whenever process conditions change.

Inputs, Outputs and Mechanical Specifications

SpecificationGMP252
Voltage output Scalable 0–5 V or 0–10 V; minimum load 10 kΩ
Current output Scalable 0–20 mA or 4–20 mA; maximum load 500 Ω
Digital output RS-485 with Modbus RTU or Vaisala Industrial Protocol
Supply with digital or voltage output 12 to 30 V DC
Supply with current output 20 to 30 V DC
Power consumption 0.4 W typical; 0.5 W maximum
Operating temperature −40 to +60 °C
Operating humidity 0 to 100 %RH, non-condensing
Operating pressure Below 1.5 bar
Recommended flow-through rate 0.1 to 0.8 l/min
Probe-body protection IP65
Probe dimensions 25 mm diameter and 130 mm length
Weight Approximately 55 g
Electrical connector M12 5-pin male

Typical GMP252 Applications

ApplicationWhy GMP252 fitsInstallation consideration
Demanding HVAC Accurate ppm-level measurement with wide temperature capability For a complete duct enclosure, also consider the dedicated GMD110 transmitter
Refrigeration equipment Heated sensor head and compensation support changing conditions Avoid liquid condensation and protect the cable connection
Greenhouses and agriculture Measures CO₂ enrichment above ambient concentrations Use a representative location away from direct dosing jets
Plant-growth chambers Compact probe with analogue and digital outputs for equipment integration Configure temperature, pressure and humidity compensation
Cold storage Wide −40 to +60 °C operating range Check whether the maximum CO₂ remains within the ppm-level range
Outdoor CO₂ measurement Can be installed with a suitable Vaisala DTR250 radiation shield Use proper weather protection and a representative ventilated location
OEM equipment M12 connection and configurable standalone outputs Provide service access and document the output and compensation settings

Vaisala GMP252 or GMP251?

Selection pointGMP252GMP251
Primary range 0 to 10,000 ppm CO₂ 0 to 20% CO₂
Extended measurement Up to 30,000 ppm with reduced accuracy Percentage-level measurement up to 20%
Best suited to Demanding HVAC, refrigeration, agriculture and ppm-level equipment Incubators, controlled atmospheres, cold storage and percentage-level processes
Typical accuracy point ±40 ppm from 0 to 3000 ppm ±0.1% CO₂ at 5% CO₂
Environmental compensation Temperature, pressure, humidity and oxygen Temperature, pressure, humidity and oxygen
Standalone outputs Voltage, current or RS-485 Voltage, current or RS-485
Indigo compatibility Indigo200, Indigo300, Indigo500 and Indigo80 Indigo200, Indigo300, Indigo500 and Indigo80
Choose this model when The process value is expressed in ppm and normally remains within the useful GMP252 range The normal concentration is percentage-level or exceeds the practical GMP252 range
Product information GMP252 is detailed on this page Explore Vaisala GMP251

Use GMP252 Standalone or with an Indigo Transmitter

ConfigurationConnection and outputsRecommended when
GMP252 standalone Direct analogue or Modbus RTU connection No local display, relay or additional transmitter enclosure is required
Indigo200 Series One probe with display, analogue or Modbus RTU model and two relays A standard industrial transmitter and local interface are required
Indigo300 One probe, IP66 metal enclosure and three analogue outputs A rugged analogue-focused installation is preferred
Indigo510 One probe, two isolated analogue outputs, Ethernet and Modbus TCP A premium single-probe system with web access is required
Indigo520 Two probes, four isolated analogue outputs, two relays, Ethernet and Modbus TCP GMP252 must be combined with another compatible probe or additional control functions
Product information Explore Vaisala Indigo200   Explore Vaisala Indigo300   Explore Vaisala Indigo510 and Indigo520

Portable Use with Vaisala Indigo80

GMP252 can connect to the Vaisala Indigo80 for portable display, configuration, data logging, diagnostics and calibration. This is useful when checking an installed process, comparing two compatible probes or carrying out adjustment work in the field.

Explore Vaisala Indigo80 Portable Meter

Compare GMP252 with Dedicated HVAC Transmitters

ProductInstallationChoose it when
GMP252 Machine, chamber, process, outdoor shield or custom mounting A compact standalone ppm-level probe and flexible integration are required
GMD110 Ventilation duct A complete IP65 duct transmitter with terminal wiring is preferred
GMW80 Series Occupied-room wall A cost-effective room transmitter with HVAC output options is required
GMW90 Series Occupied-room wall Higher-performance room CO₂, temperature and optional humidity measurement is required
Product information Explore Vaisala GMD110   Explore Vaisala GMW80   Explore Vaisala GMW90

Calibration and Maintenance

GMP252 can be configured, diagnosed and adjusted using Vaisala Insight PC software, a compatible Indigo transmitter, Indigo80 or supported MI70 equipment. Calibration frequency should reflect process criticality, environmental exposure, quality requirements and the required measurement uncertainty.

  • Use certified reference gas appropriate to the application range.
  • Enter the correct temperature, pressure, humidity and oxygen compensation values.
  • Allow the probe and gas delivery arrangement to stabilise before adjustment.
  • Inspect the filter and replace it when contamination or damage affects response.
  • Use the correct calibration adapter and controlled gas flow where applicable.
  • Record the as-found result, adjustment, as-left result and reference-gas certificate.

Commissioning Checklist

  1. Confirm that GMP252, rather than GMP251, matches the expected CO₂ range.
  2. Select standalone, Indigo transmitter or Indigo80 operation.
  3. Verify the output mode, power supply, cable and receiving-system input.
  4. Install the probe and accessories with representative exposure and adequate service access.
  5. Configure temperature, pressure, humidity and oxygen compensation.
  6. Check analogue scaling or Modbus address and communication settings.
  7. Allow the probe to warm up and stabilise.
  8. Compare the reading with a suitable reference where required.
  9. Verify the output, displayed value, relay, alarm and control response.
  10. Record the model, serial number, configuration and calibration certificate.

Vaisala GMP252 Supplier and Technical Support in Malaysia

Seacom Process Instruments supplies and supports the Vaisala GMP252 PPM-Level CO₂ Probe in Malaysia for demanding HVAC, refrigeration, greenhouses, plant-growth chambers, cold storage, outdoor measurement and industrial equipment.

Our team can help confirm whether GMP252 or GMP251 is appropriate, select the standalone output or Indigo transmitter, specify cables and installation accessories, and review temperature, pressure, humidity and oxygen compensation. We can also assist with Indigo80 use, commissioning and calibration planning.

Selecting a GMP252 configuration? Send us the normal and maximum CO₂ concentration, temperature, pressure, humidity, oxygen level, installation method, output signal, controller interface and calibration requirement.

Download

  GMP252 Catalogue   (172.51k)

  GMP251 Catalogue   (218.45k)

  GMP252 Order Form   (165.17k)


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