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4. Press Start/Enter
a. Instrument will display “exit to quit”
b. “START to set Zero, else EXIT”
i. If the silica gel is connected and has been flowing for several minutes, press
START.
ii. “Use 0 kPa H2O, Press START/ENTER”
1. Press START/ENTER and instrument will count down from 60 seconds
and set the H2O zero.
2. At this point, the H2O concentration of the gas passing the analyzer is
taken as 0 ppm and the sensor is calibrated to read this level as 0.
Therefore, if the gas isn’t 0 ppm or hasn’t been allowed enough time to
run through and completely clear the system, the calibration can skew
the instrument further.
5. After the H2O zero is set, the instrument will display “Use known H2O gas, Press
START/ENTER’
6. If you wish to calibrate the H2O Span, hit start/enter. If you only wish to calibrate the H2O zero,
press EXIT
7. To calibrate the H2O span, connect a gas with a known concentration of H2O (*see general
overview).
a. Press Start/Enter
b. The unit will display “H2O pressure: ? x.xxx kPA”
i. Enter the known partial pressure of the H2O gas in kPA. This can be calculated
from the relative humidity and temperature.
ii. CID provides a DOS program that will convert RH and Temperature to kPA. This
can be downloaded on the Distributor’s website in the CI-340 software page.
iii. Download “A program to convert RH and temperature to kPa vapor pressure:
Download rh2kpa.exe V1.2.1.0 31kB”
iv. Use the program to get the kPa to enter into the instrument.
c. Enter the H2O pressure of the known standard gas from 1.0-7.5 kPA.
i. Hit Start/Enter
ii. Instrument will count down from 60 seconds and set the H2O span.
iii. Press Start/Enter to save and the display will return to the “ENTER to select
Calibrate H2O”.
Data Transfer
The CI-340 automatically saves data files with a memory capacity of 4 megabytes; older versions have a
memory capacity of 2 MB. The memory of the CI-340 during normal use will suffice for approximately
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