Gases Detection

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CO2, Temperature and Humidity Transmitter Series GMW90

CO2, Temperature and Humidity Transmitter GMW90 Series

The wall-mounted Vaisala GMW90 Series CARBOCAP® Carbon Dioxide, Temperature and Humidity Transmitters are especially suited for green building projects and demand controlled ventilation. The devices measure carbon dioxide and temperature and have an option for an additional humidity measurement. The instruments come with a calibration certificate that meets traceability and compliance requirements. Traceability is easily maintained with field-exchangeable intelligent measurement modules. The transmitter can be blended into the interior design of the space where it is installed using the optional decorative cover.

Combustible Gas Transmitter

MSR ADT transmitter with digital processing of the measured values and temperature compensation for the continuous monitoring of the ambient air and detection of combustible gases and vapours. The calibration routine with selective access release enables the comfortable calibration of the transmitter. In addition to the standard analog output (0) 4-20 mA or (0) 2- 10 V DC the ADT-23 is equipped with a RS-485 interface for different protocols. Two relays with adjustable switch threshold are available as an option.

CO₂ Probe GMP251

CO₂ Probe GMP251

for %-level measurements in life science incubators, cold storage facilities and all demanding applications

The Vaisala CARBOCAP® Carbon Dioxide Probe GMP251 is an intelligent, stand-alone, %-level probe for measuring CO2 in life science incubators, cold storage facilities, fruit and vegetable transportation, and in all demanding applications where stable and accurate percentage-level CO2 measurements are needed. The operating temperature range is -40 … +60 °C and the measurement range is 0 … 20%CO2.

The GMP251 is based on Vaisala’s unique,second-generation CARBOCAP® technology that enables exceptional stability. A new type of infrared (IR) light source is used instead of the traditional incandescent light bulb, which extends the lifetime of the GMP251. It has full temperature and pressure compensations of CO2 measurement – integrated temperature measurement for compensation purposes. The sensor head is heated to prevent condensation. Digital output over RS-485: Modbus & Vaisala Industrial Protocol. A calibration certificate is always included with the product

The GMP251 probe is part of the Indigo product family and can also be connected to the Indigo500 and Indigo200 series transmitters to extend its features, for example, for a display or relays.

The GMP251 can also be used with with the free Insight PC Software.

For spot-checking, the ideal choice is the Handheld CO2 Meter GM70.

The GMP251 replaces the following discontinued products: GMM221 and GMT221

CO₂ Probe GMP252

CO₂ Probe GMP252

for ppm-level measurements in agriculture, refrigeration, demanding HVAC, and for plant growth manufacturers

The Vaisala CARBOCAP® Carbon Dioxide Probe GMP252 is an intelligent, stand-alone, ppm-level probe. It's intended for measuring CO2 in agriculture, refrigeration, greenhouses, demanding HVAC applications, and for plant growth chamber manufacturers. It is suitable for harsh and humid CO2 measurement environments where stable and accurate ppm-level CO2 measurements are needed. The operating temperature range is -40 … +60 °C and the measurement range is 0 … 10 000 ppm CO2, and  even up to 30 000 ppm CO2  with a slightly reduced accuracy. 

The GMP252 can also be placed inside the Vaisala Radiation Shield DTR250 for measuring dynamically outdoor CO2 levels.

The GMP252 probe is part of the Indigo product family and can also be connected to the Indigo500 and Indigo200 series transmitters to extend its features, for example, for a display or relays.

The GMP252 can also be used with with the free Insight PC Software.

For spot-checking, the ideal choice is the Handheld CO2 Meter GM70.

The GMP252 replaces the following discontinued products: GMM222 and GMT222

Freon Gas Transmitter

MSR MA-4 Freon Analog transmitter for the continuous monitoring of gases and vapours in the ambient air. Used in garages, chiller rooms and heating systems, the µ-Gard MA series analog transmitter is a reliable gas detector.


For the detection of gases within a wide range of commercial applications. Due to the 4 – 20 mA or 0 - 10 V analog signal the transmitter is compatible to the µ-Gard gas controller series ADC of MSR-E.

Gas Alarm System

MSR measures gas efficiently at mininum wiring expenditure (Radio-Sensor/Transmitter RT). With most diverse measurement, MSR is experienced in detecting combustible and toxic gases. Using the MSR components, you will have higher investment return and lower maintenance costs.

Applications examples:
1) Parking Garages - continuous monitoring of harmful CO content in air
2) Diesel-Truck Garages and Cargo Areas - continuous monitoring of harmful NOx content in air
3) Refrigeration Plants - early detection and warning of refrigerant leaks
4) Laboratories - continuous monitoring of oxygen in air
5) Heating systems - early detection and warning of combustible gases

Incubator CO₂ Probe GMP231

Incubator CO₂ Probe GMP231

The Vaisala CARBOCAP® Carbon Dioxide Probe GMP231 is designed to provide incubator manufacturers with accurate and reliable carbon dioxide measurements and sterilization durability at high temperatures, up to 180 °C. The GMP231 probe is based on Vaisala’s patented CARBOCAP® technology and a new type of infrared (IR) light source. 

The GMP231 probe’s sensor performance is optimized at 5 % CO2  but the sensor measures CO2 up to 20 % with high accuracy. The GMP231 is t's installed through the incubator wall; only the IR sensor and optical components are exposed to the incubation environment. 

In addition, the GMP231 can measure pressure and temperature for CO2 measurement compensation purposes, ensuring the product remains stable and accurate in all CO2 incubation conditions.

The sensor is made of highly durable materials to achieve outstanding stability over both time and temperature. Since water vapor, dust, and most chemicals do not affect measurements, the GMP231 module is ideal for CO2 incubator environments.

Leak Detector LD400

If gases escape through leaks in piping systems (e.g. untight screwed connections, corrosions and so on) ultrasonic noises are generated. By means of LD 400 even the smallest leakages which cannot be heard by the human ear can be detected even from distances of several meters. LD 400 transforms the inaudible signals into a frequency which can be identified. By means of the comfortable sound-proof headset these noises can be realized even in extremely noisy environments.

Due to a particularly designed acoustic trumpet a better focusing of the acoustic waves is achieved. This acoustic trumpet acts like a directional microphone while interfering ambient noises are cushioned and the accurate localization of the leakages is eased even in areas which are difficult to access.

Indigo200 Series Transmitters for Vaisala smart probes for Vaisala Smart Probes

Transmitters for Vaisala Smart Probes Indigo200 Series

for Vaisala's Smart Humidity, Temperature, Dew Point, Moisture in Oil, CO2 and H2O2 Probes

Vaisala Indigo200 Series host devices are part of Vaisala Indigo product family and intended for Vaisala's intelligent, stand-alone humidity probes (HMP1, HMP3, HMP4, HMP5, HMP7, HMP8 and HMP9), dew point probes (DMP5, DMP6, DMP7 and DMP8), temperature probe (TMP1), CO2 probes (GMP251 and GMP252), moisture in oil probe MMP8, as well as our vaporized hydrogen peroxide probe series HPP270: including HPP271 to measure hydrogen peroxide vapor (ppm), or the HPP272 to measure hydrogen peroxide vapor (ppm), temperature, and humidity (relative humidity and relative saturation). The HPP272 probe includes other calculated parameters such as dew point and vapor pressure measurements.

Looking for a transmitter with a metal enclosure? See Indigo500 series with dual-probe support and many more additional features.

Typical applications for the Indigo200 include industrial and compressed air drying, life science incubators, hatchers and setters, greenhouses, cold storage & refrigeration, food transportation, CO2 safety, hydraulic and lubrication oil monitoring, demanding HVAC such as animal shelters, swimming pools, parking garages, and facilities using vaporized hydrogen peroxide decontamination.

Indigo200 allows for easy evaluation and visualization of data, also wirelessly. The installation is uncomplicated, which saves time. Watch video on how to install Indigo201 and configure analog outputs. Also the probe types are interchangeable reducing downtime. The enclosure with an IP65 classification is safe for harsh environments and resistant to dust and most chemicals. The smooth surface of the enclosure makes cleaning easy.

Transmitters for Vaisala smart probes Indigo500 Series

The Vaisala Indigo520 transmitter with dual-probe and multi-parameter support is a host device for Vaisala Indigo-compatible, stand-alone smart probes. The transmitter offers many additional features to the Indigo probes. 

The touchscreen display provides local data visualization and easy access to probe configuration. The transmitter also extends the options for connectivity, supply voltage and wiring, compared to using just a smart probe. It also provides mechanical support when wall-mount probe installation is preferred.​ Rugged IP66- and NEMA4-rated  metal enclosure ensures reliable performance even in the harshest conditions.

The Indigo-compatible smart probes include humidity probes (HMP1, HMP3, HMP4, HMP5, HMP7, HMP8 and HMP9), dew point probes (DMP5, DMP6, DMP7 and DMP8),  carbon dioxide probes (GMP251 and GMP252), moisture in oil probe (MMP8), temperature probe (TMP1), and vaporized hydrogen peroxide probes (HPP270). The Indigo520 is also compatible with MHT410 Moisture, Hydrogen and Temperature Transmitter for power transformer online monitoring

The Indigo520 transmitter can accommodate up to two probes simultaneously. The plug-and-play probes are easy to install and remove for calibration.

Ultrasonic Leak Detector

Whisper Ultrasonic Leak Detector is ideal for detecting and locating sources of ultrasonic sound through the use of sophisticated electronic circuitry. Unaffected by audible noise, Whisper incorporates an Internal Noise Control allowing for use in extremely noisy environments, such as mechanical rooms, and around operating chillers. Because Whisper is designed to detect ultrasound at 40.5 kHz, not even a murmur will escape detection.

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