CI-900 Instruction Manual 8/10/2015
1554 NE 3
rd
Ave, Camas, WA 98607, USA Phone: (360) 833-8835
sales@
cid-inc
.com
www.cid-inc.com
42
O
2
Calibration
The offset and gain from the previous calibration can be seen under Calibration Parameters. These
values are achieved by setting a zero and a span for the unit. To re-calibrate, pressurized N
2
gas and
O
2
gas will be needed. If O
2
gas is not available, ambient air may be used.
Annual re-calibration is
recommended
, but if the environment changes frequently, re-calibration may be required more
often. To set the zero of the O
2
sensor, follow the same instructions for the CO
2
sensor zero
calibration, with the following changes:
1. Use 0 ppm O
2
gas.
2. Highlight O
2
in the Measure>Settings menu and press ENTER twice when it is time to set
the zero.
Calibrating the O
2
sensor with standardized gas is fairly simple.
Remember, to always use a "T"
connection to vent excess gas and prevent damage to the internal components.
1.
Go to Calibration, hit enter, then O
2
.
2.
Go to Re-calibration and press the right arrow. You will hear the valves open and the
pump begin to run.
3.
Use pressurized N
2
to create zero O
2
gas. When the gas is flowing and connected to the
unit, press Enter.
4.
The unit will count down as it sets the zero for the O
2
sensor. The humidity,
Temperature, and Flow are displayed. The flow should continue to read 200 mL
throughout the calibration- if it does not you may have a leak or obstructed tube.
(Pressing enter at any time will move you into the next step. Only do so if you want to
use the previous zero calibration).
5.
Setup Calibration gas: Enter the percent concentration, where 1000 E-3 = 100% and
210 E-3= 21%. Use the LEFT/RIGHT arrow keys to switch between placeholders, and
the UP/DOWN arrows to change the values.
6.
Press save to initiate the calibration.
7.
The unit will count down from 19 as it sets the span for the O
2
sensor. (Pressing enter at
any time will move you into the next step. Only do so if you want to use the previous
span calibration).
8.
After the unit has set the zero and the span for the O
2
sensor, the Calibration Results are
displayed. Press Save to save the values and return to the Calibration Menu.
Summary of Contents for CI-900
Page 2: ......