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102

GMT220 Series Carbon Dioxide Transmitters

for Industrial Applications

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. The patented

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 calibration intervals,

the user saves both time and money.

Interchangeable Probes

The user has a choice of

measurement ranges up to 20%

of CO

. The GMT221 is for higher

concentrations of CO

and the

The GMT220 transmitters withstand harsh and humid environments.

Features/Beneﬁ ts

▪

Incorporates Vaisala

CARBOCAP® - the silicon-

based NDIR sensor

▪

IP65 protected against dust

and spray water

▪

Several measurement ranges

▪

Easy installation

▪

Standard analog outputs

and two conﬁ gurable relays

available

Applications include:

▪

Horticulture and fruit storage

▪

Greenhouses and mushroom

farming

▪

Safety alarming and leakage

monitoring

▪

Demand controlled ventilation

in harsh environments

GMT222 for lower concentrations

of CO

. The 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.

4-Carbon-Dioxide-Pages-100-119-Vaisala-Catalog-2011.indd 102 24.10.2011 9.21

103

Technical Data

Ref. B210827EN-C ©Vaisala 2011

This material is subject to copyright protection, with all

copyrights retained by Vaisala and its individual partners. All

rights reserved. Any logos and/or product names are trademarks

of Vaisala or its individual partners. The reproduction, transfer,

distribution or storage of information contained in this brochure

in any form without the prior written consent of Vaisala is strictly

prohibited. All speciﬁ cations — technical included — are subject

to change without notice.

For more information, visit

www.vaisala.com or contact

us at sales@vaisala.com

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 minutes full speciﬁ cations

Mechanics

Housing material

transmitter body ABS plastic

probe PC plastic

Housing classiﬁ cation IP65

Weight:

GMT221 max. 280 g

GMT222 max. 300 g

Probe cable length 2 m and 10 m (optional)

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-deﬁ ned relay

outputs

Relay contacts max. 30VAC/60VDC, 0.5A

Connections screw terminals, 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)

Operating pressure (compensated range) 700 ... 1300 hPa

Humidity 0 ... 100 %RH, non-condensing

Electromagnetic compatibility EN61326-1, Generic Environment

Accessories

Spare probe GMP221, GMP222

(use the order form to deﬁ ne measurement range etc.)

Clips (2 pcs) for attaching the probe 25245GM

Mounting ﬂ ange 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

GMT220 transmitter GMP222 probe

GMP221 probe

Dimensions

Dimensions in mm (inches)

119 (4.69)

31.8 (1.25)

119 (4.69)

109 (4.29)

ෘ18.5 (0.73)

155 (6.102)

ෘ18.5 (0.73)

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