Vaisala GMM220 Series Manual de usuario

GMM220 Series CO2 Transmitter Modules

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INTRODUCTION

Vaisala’s GMM220 transmitter modules are versatile instruments for measuring CO2in

industrial applications. The CARBOCAP®sensor is silicon based and its operation is

based on the NDIR Single-Beam Dual-Wavelength principle. The modules can be

configured for different CO2measurement ranges and analog output ranges.

Figure 1. Dimensions of the Probes and Component Board of the GMM220 Series

(in mm).

The GMM220 module consists of a component board, cable and a CO2probe. The shorter

probe model (GMP221) is for higher and the longer model (GMP222) for lower CO2

concentrations. A waterproof connector connects the probe to the cable. The probe also

features a non-volatile memory for storing the calibration parameters. This enables true

interchangeability of the probes and forms a good basis for easy field calibration.

MOUNTING

For power supply and analog outputs, the board is available either with pinheaders on

bottom side or with screw terminals on top side; serial interface has always a pinheader.

Figure 2 Dimensions of the Component Board (in mm)

If the board has pinheaders, mount it by soldering or plugging it into host board's female

connectors.

GMP221

GMP222

100

145

D18.5

GMP221

GMP222

GMM220 Series CO2 Transmitter Modules

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ELECTRICAL CONNECTIONS

Figure 3. Electrical Connections

Power supply: Two supply voltage alternatives:

+L 12 volt supply input (11 VDC - 20 VDC)

+H 24 volt supply input (18 VDC - 30 VDC)

GND common ground for power supply

Average current consumption is 100 mA (+ current output, max. 20 mA)

Analog outputs:

0common for both analog outputs

Vvoltage output (default 0-1 V, on request 0-2 V, 0-2.5 V or 0-5V)

mA current output (default 4-20 mA, on request 0-20 mA)

Serial interface:

The interface is a 5 Volt (TTL) level full duplex serial port.

GND signal ground (same potential as the supply GND)

TX data transmitted by the CO2 module (low state corresponding mark)

RX data received by the CO2 module (low state corresponding mark)

Leave other serial interface pins unconnected.

Probe wires:If the CO2module is ordered with a separate probe cable, solder the wires

to the component board according to colors shown in Figure 3.

LEDS: Normal operation: Led V8 (red) is not lit and Led V9 (green) is blinking. Error

state: Led V8 (red) is blinking and Led V9 (green) is blinking, no readings. In error state,

check first that the probe is properly connected. In case of constant error, please contact

Vaisala Service Centers.

SERIAL INTERFACE PROTOCOL

The transmitter is connected to a computer with the optional serial COM adapter

(19040GM). A suitable terminal program such as WINDOWS®Hyper Terminal is needed

for the communication.

Port settings:

Baud rate 9600, data bits: 8, stop bits :1, parity: none, flow control: none

LED V8 LED V9

GMM220 Series CO2 Transmitter Modules

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COMMANDS

The last character in the GMM220 reply is a prompt >.

Single CO2measurement output

DISP option <cr>

Options: 2 = concentration in ppm, 4 = concentration in %

For example:

>DISP 2<cr> the command (bold)

6543.2 <cr><lf> response from the GMM220

> prompt sent by the GMM220

Continuous CO2measurement output

MF_MODE option <cr>

Options: 0 = no output, 2 = output concentration in ppm, 4 = output concentration in %

For example:

>MF_MODE 4<cr> the command (bold)

5.625<cr><lf> response from the GMM220

5.625<cr><lf>

To stop continuous outputting, give command: MF_MODE 0<cr> or <ctrl+C>

Pressure compensation (if altitude differs from sea level (default), make pressure compensation)

Altitude m (ft) Atmospheric

pressure hPa (psi)

MF_PRESSURE xxxx <cr>

where: xxxx = pressure in hPa.

Example of setting desired pressure:

>MF_PRESSURE 900

MF_PRESSURE=900

To save the setting, give command: MAIN_SAVE F

0 (sea level)

500 m (1640 ft)

1000 m (3281 ft)

1500 m (4921 ft)

2000 m (6562 ft)

2500 m (8202 ft)

3000 m (9843 ft)

1013 hPa (14.69 psi)

954 hPa (13.84 psi)

899 hPa (13.04 psi)

845 hPa (12.26 psi)

795 hPa (11.53 psi)

747 hPa (10.83 psi)

701 hPa (10.17 psi)

Temperature setting

MF_TEMP xxx <cr>

where: xxx = ambient temperature (°C) x 10.

Example of setting desired temperature (25 °C):

>MF_TEMP 250

MF_TEMP=250

To save the setting, give command: MAIN_SAVE F

GMM220 Series CO2 Transmitter Modules

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TECHNICAL DATA

Measuring ranges

GMM221 0 … 2%, 0 … 3%, 0 … 5%, 0 … 10% , 0 … 20% CO2

GMM222 0 … 2000 ppm, 0 … 3000 ppm, 0 … 5000 ppm,

0 … 7000 ppm, 0 … 10 000 ppm

Accuracy at 25°C against

certified factory references

GMM221 ±[1.5 % of range + 2 % of reading]

GMM222 ±[1.5 % of range + 2 % of reading]

(including repeatability and calibration uncertainty)

Nonlinearity ±0.5 % FS

Temperature dependence

of output (typically) -0.1 %FS / °C1)

Pressure dependence (typic.) +0.15 of reading/hPa2)

1)When temperature rises, the output decreases, default 25 °C (77 °F).

2)When pressure rises, the output increases, default 1013 hPa (1 atm).

Long-term stability <±5 %FS / 2 years

Response time (63%) 20 seconds (GMM221)

30 seconds (GMM222)

Operating conditions

Operating temperature range -20…+60 °C

Humidity range

probe 0 … 100 %RH (non-condensing)

mother board 0 … 85 % RH (non-condensing)

General

Analog outputs 0 … 20 mA or 4 … 20 mA and

0 … 1 V or 0 … 2 V, 0 … 2.5 V, 0 … 5 V

Resolution of analog outputs 0.03 %FS

Recommended external load:

current output max. 200 Ω

voltage output min. 1kΩ

Power supply 11 … 20 VDC or 18 … 30 VDC

Serial output @ 5V level

Power consumption < 2.5 W

Warm-up time < 5 minutes

Probe cable length 0.6 m, 2 m, 6 m, 10 m

Mechanics

Probe:

housing material PC plastic

housing classification IP65/NEMA4

Weight:

GMM221(w/ 2m cable) max. 180 g

GMM222 (w/ 2m cable) max. 200 g

GUARANTEE

Vaisala issues a guarantee for the material

and workmanship of this product under

normal operating conditions for one (1)

year from the date of delivery.

Exceptional operating conditions, damage

due to careless handling and

misapplication will void the guarantee.

COMPLIANCE WITH THE EMC-

STANDARDS

EN 61326-1:1997 + Am1:1998, Electrical

equipment for measurement, control and

laboratory use - EMC requirements-

Generic environment.

Testing: CISPR16/22 class B, EN/IEC

61000-4-2, EN/IEC 61000-4-3, EN/IEC

61000-4-4, EN/IEC 61000-4-5, EN/IEC

61000-4-6.

Accessories

Order code Description

GMP221,

GMP222

Spare probe

25378GMSP Spare filter for GMP221

25879GMSP Spare filter for GMP222

25245GM Clips (2 pcs) for attaching

the probe

GM45168SP Protective sleeve for

GMP221

GM45237SP Protective sleeve for

GMP221

26150GM Field check adapter

GM45156 Mounting flange for the

probe

19040GM Serial COM adapter

VAISALA SERVICE CENTERS

NORTH AMERICAN SERVICE CENTER

Vaisala Inc., 100 Commerce Way, Woburn, MA 01801-1068, USA.

Phone: +1 781 933 4500, Fax +1 781 933 8029

Email: us-custom[email protected]

EUROPEAN SERVICE CENTER

Vaisala SSD Service, Vanha Nurmijärventie 21 FIN-01670 Vantaa,

FINLAND.

Phone: +358 9 8949 2758, Fax +358 9 8949 2295

E-mail: [email protected]

ASIAN SERVICE CENTER

Vaisala KK, 42 Kagurazaka 6-Chome, Shinjuku-Ku, Tokyo 162-0825,

JAPAN.

Phone: +81 3 3266 9611, Fax +81 3 3266 9610

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