Basic Measuring Circuit:

The diagram at the right shows the basic measuring circuit of

TGS5042. The sensor generates a minute electric current which is

converted into sensor output voltage (Vout) by an op-amp/resistor

(R2) combination. An additinal resistor (R1) is required to prevent

polarization of the sensor when circuit voltage is off.

Figaro recommends the fllowing electrical parts:

        R1 : 1kQ

       R2: 100kQ

       C1 : 22μF

       IC : AD708

NOTE: When voltage is applied to the sensor output terminal, the

sensor may be damaged. Voltage applied to the sensor should be

strictly imited to less than t10mV.

Specifications;

ltem                                             Tentative Specitication

Model number                                  TGS 5042

Target gases                                 Carbon monoxide

Typical detection range                   0 ~ 1000 ppm

Output current in CO                   1.00~3.75nA/ppm

Baseline offset                              <±15ppm equivalent

Operating temperature                    -10 ~ +60'C

Operating humidity                    5 ~ 99%RH (no condensation)

Response time (T90)                    within 60 seconds

Expected accuracy                        ±20% at 0- 100ppm of CO

                                                      ±15% at 100-500ppm of CO

                                                       {at 20±15"C50±20%AH)

Storage conditions                      -40一+70'C

Weight                                        approx. 12g

Standard test conditions                20±2'C, 40±10%RH