Vaisala GMM220 Series User manual

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
35
80
145
D18.5
D18.5
GMP221
GMP222
78
48

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>
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: [phone], Fax [phone]
Email: us-custom[email protected]
EUROPEAN SERVICE CENTER
Vaisala SSD Service, Vanha Nurmijärventie 21 FIN-01670 Vantaa,
FINLAND.
Phone: [phone], Fax [phone]
E-mail: [email protected]
ASIAN SERVICE CENTER
Vaisala KK, 42 Kagurazaka 6-Chome, Shinjuku-Ku, Tokyo 162-0825,
JAPAN.
Phone: [phone], Fax [phone]