User manual VAISALA GMM220

[. . . ] GMM220 Series CO2 Transmitter Modules M010115EN-D INTRODUCTION Vaisala's GMM220 transmitter modules are versatile instruments for measuring CO2 in industrial applications. The CARBOCAP® sensor is silicon based and its operation is based on the NDIR Single-Beam Dual-Wavelength principle. [. . . ] 20 mA) Analog outputs: 0 V mA common for both analog outputs voltage output (default 0-1 V, on request 0-2 V, 0-2. 5 V or 0-5V) 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 TX RX signal ground (same potential as the supply GND) data transmitted by the CO2 module (low state corresponding mark) data received by the CO2 module (low state corresponding mark) Leave other serial interface pins unconnected. Probe wires:If the CO2 module 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 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 2 GMM220 Series CO2 Transmitter Modules M010115EN-D COMMANDS The last character in the GMM220 reply is a prompt >. Single CO2 measurement output DISP option <cr> Options: 2 = concentration in ppm, 4 = concentration in % For example: >DISP 2<cr> 6543. 2 <cr><lf> > the command (bold) response from the GMM220 prompt sent by the GMM220 Continuous CO2 measurement output MF_MODE option <cr> Options: 0 = no output, 2 = output concentration in ppm, 4 = output concentration in % For example: >MF_MODE 4<cr> 5. 625<cr><lf> 5. 625<cr><lf> 5. 625<cr><lf> . the command (bold) response from the GMM220 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) MF_PRESSURE xxxx <cr> where: xxxx = pressure in hPa. Example of setting desired pressure: >MF_PRESSURE 900 MF_PRESSURE=900 > Altitude m (ft) 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) Atmospheric pressure hPa (psi) 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) To save the setting, give command: MAIN_SAVE F 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 3 GMM220 Series CO2 Transmitter Modules M010115EN-D TECHNICAL DATA Measuring ranges GMM221 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 1) of output (typically) -0. 1 %FS / °C Pressure dependence (typic. ) +0. 15 of reading/hPa2) 1) 2) COMPLIANCE WITH THE EMCSTANDARDS EN 61326-1:1997 + Am1:1998, Electrical equipment for measurement, control and laboratory use - EMC requirementsGeneric environment. [. . . ] Phone: +1 781 933 4500, Fax +1 781 933 8029 Email: us-customersupport@vaisala. com 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: ssdservice@vaisala. com ASIAN SERVICE CENTER Vaisala KK, 42 Kagurazaka 6-Chome, Shinjuku-Ku, Tokyo 162-0825, JAPAN. [. . . ]