Carbon Dioxide Meter

The Carbon Dioxide Meter is a field operated Instrument for measuring CO2 and temperature in both gas and liquid phase. The unit is capable of measuring CO2 from 0.1 to 100%.

Measurement principle

A diaphragm-type glass electrode based on the electrochemical principle is employed for this CO2 gas sensor. According to this principle, when CO2 gas passes through the diaphragm and dissolves in the inner solution, the pH of the solution changes. Because the change of the pH is proportional to the CO2 concentration, the degree of change is measured to determine the CO2 concentration. The following figure indicates the relationship, which exhibits good linearity characteristics, between the CO2 concentration and the electric potential of the glass electrode. If there is a 10-fold change in the CO2 concentration, there is an approximately 60 mV change in the electric potential. Relationship between the CO2 concentration and the electric potential difference of the glass electrode

Features

• Excellent selectivity: The diaphragm-type glass electrode method is employed to guard against the effects of other mixed gases (except acid gases and basic gases). There is also no need for drying sample because the sensor is relatively unaffected by humidity.
• Concentration conversion function: You can specify to switch between the gas phase concentration (%(v/v)) and the liquid phase concentration (mg/L).
• Memory function capable of saving: up to 1,000 data items. Supports auto-save for specified intervals*
• Short interval memory function: 1 sec. to 99 min. 59 sec.
• Long interval memory function: 2 min. to 99 hrs. 59 min. (When using the long interval memory function, the switch turns off (enters sleep mode) after measuring concentration for 1 minute. It remains off until the next measurement starts.)
• Interface for External Devices: (Ability to connect the meter to a personal computer, an external printer, and a recorder.) We also provide special data acquisition sof tware for loading saved measurement data into a personal computer in text format.
• Waterproof construction ( meter part): IP 67 (enabled when the sensor is connected and on the external I/O ports are masked). The meter part can be submerged at a depth of 1 m for up to 30 min.
• Ambient temperature/humidity: 0 to 45C , no more than 90% (no condensation)