6
4. Press Key “4" once to remove the prompt. The LCD will read “000" (Waiting for
operator to key in function number to go to).
5. Press Key “2" once and Key “3" once. The LCD will read “011" ( function number
11, Manual Calibration).
6. Press Key “4" twice to enter function 11. The message “ZERO INPUT” will scroll
across the 3 digit LCD.
7. Press Key “4" once to remove the prompt.
*The LCD of the P2621-NO2/VC Monitor will display the 3 digit Analog to Digital
NO2unt (ADC). The ADC has a possible range of 0 - 999 with typical values of
“050" with ZERO AIR applied, “400 - 500" with 250ppm (Half-scale) NO2 GAS
applied, or “800-999" with 500ppm (full scale) NO2 gas applied.
8. Inject ZERO-AIR into the sensor. Wait approximately 2 minutes. The ADC should
read approximately “050" with ZERO AIR flowing through the sensor. Press Key
“4" once to accept the ZERO GAS calibration. (If the reading on LCD is outside the
range of 25 – 100, the monitor should be sent back to the factory for in-house
calibration)
The message “SCALED INPUT” will scroll across the LCD followed by the
message “FULL SCALE INPUT”.
9. Press the Key “CONFIG/4" once WHILE either message is scrolling depending on
whether you are using Full (20ppm) or Scaled (10ppm) NO2 Cal-Gas.
*The LCD of the P2621-NO2/VC Monitor will display the 3 digit Analog to Digital
Count (ADC).
10. Remove the ZERO AIR and inject the NO2 CAL-GAS into the sensor. The ADC
should climb as the sensor responds to the Cal-Gas (typically ~ 450 with 10ppm, or
~ 850 with 20ppm, if the reading is differed by more than 50%, sent the monitor
back to the factory for in-house calibration). Wait approximately 2 minutes for the
ADC to stabilize.
11. Press Key “4" once to accept the SCALED GAS calibration.
*The message “CONSPEC Ver#” will scroll across the LCD (Software Version
Number).
