Vaisala GMT220 Technical data

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GMT220 Series Carbon Dioxide Transmitters for Industrial Applications

The GMT220 transmitters withstand harsh and humid environments.

Features/Beneﬁts

Incorporates Vaisala

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CARBOCAP® - the siliconbased NDIR sensor

IP65 protected against dust

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and spray water

Several measurement ranges

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Easy installation

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Standard analog outputs

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and two conﬁgurable relays available

Applications include:

Horticulture and fruit storage

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Greenhouses and mushroom

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farming

Safety alarming and leakage

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monitoring

Demand controlled ventilation

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in harsh environments

The Vaisala CARBOCAP® Carbon Dioxide Transmitter Series GMT220 is designed to measure carbon dioxide in harsh and humid environments. The housing is dust- and waterproof to IP65 standards.

The GMT220 series transmitters incorporate the advanced Vaisala CARBOCAP sensor has unique reference measurement capabilities. Its critical parts are made of silicon; this gives the sensor outstanding stability over both time and temperature. By lengthening the time between calibration intervals, the user saves both time and money.

Sensor. The patented

Interchangeable probes

The user has a choice of measurement ranges up to 20% of CO

. The GMT221 is for higher

concentrations of CO for lower concentrations of CO GMT220 probes are interchangeable. They can be removed and reattached or replaced at any time – without the need for calibration and adjustment. The probes can be attached directly to the transmitter body or, when used with a cable, installed remotely into hard-to-reach places or areas with dangerously high levels of CO

The interchangeability of the GMT220 transmitter’s probes truly facilitates eld maintenance.

The end user can carry out eld maintenance without any additional equipment or heavy and expensive calibration gas bottles by simply replacing a probe.

Probes that have been replaced can be sent to Vaisala for recalibration.

and the GMT222

. The

Technical data

Performance

Measurement Ranges

GMT221 0 ... 2 % for high concentrations 0 ... 3 %

0 ... 5 % 0 ... 10 % 0 ... 20 %

GMT222 0 ... 2000 ppm for low concentrations 0 ... 3000 ppm

0 ... 5000 ppm 0 ... 7000 ppm

0 ... 10 000 ppm Accuracy (including repeatability, non-linearity and calibration uncertainty) at 25 °C and 1013 hPa

GMT221 ±(1.5 % of range + 2 % of reading) (applies for concentrations above 2 % of full scale)

GMT222 ±(1.5 % of range + 2 % of reading) Temperature dependence, typical -0.3 % of reading / °C Pressure dependence, typical +0.15 % of reading/hPa Long-term stability <±5 %FS/2 years Response time (63 %)

GMT221 20 seconds

GMT222 30 seconds Warm-up time 30 seconds, 15 minute full speciﬁcations

Inputs and outputs

Outputs 0 ... 20 or 4 ... 20 mA

and 0 ... 10 V Resolution of analog outputs 12 bits Recommended external load:

current output max. 400 Ohm

voltage output min. 1 kOhm Two pre-or user-deﬁned relay outputs Relay contacts max. 30VAC/60VDC, 0.5A Connections screw teminals, 0.5 ... 1.5 mm Operating voltage nominal 24 VAC/DC Power consumption <4 W

Operating environment

Operating temperature -20 ... +60 °C (-4 ... +140 °F)

with display 0 ... +50 °C (+32 ... +122 °F) Storage temperature -30 ... +70 °C (-22 ... +158 °F) Humidity 0 ... 100 %RH, non-condensing Electromagnetic compatibility EN61326-1, Generic Environment

Mechanics

Housing material

transmitter body ABS plastic

probe PC plastic Housing classiﬁcation IP65 Weight:

GMT221 max. 280 g

GMT222 max. 300 g Probe cable length 2 m and 10 m (optional)

Accessories

Spare probe GMP221, GMP222

(use the order form to deﬁne measurement range etc.) Clips (2 pcs) for attaching the probe 25245GM Mounting ﬂange for the probe GM45156 Probe cables

2 m 25665GMSP

10 m 210848GMSP Calibrator for interchangeable probes GMK220 Wall Assembly Plate GM45160 In-soil adapter for probe 211921GM Serial COM adapter 19040GM Calibration adapter for probe 26150GM

For more information, visit www.vaisala.com or contact us at sales@vaisala.com

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