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Bactrox Operations Manual 13
9.5.17
To enter a low calibration, type in LC2= (value of certified calibration gas) in
uppercase in the TERATERM program. The display will show LC2=( value of
certified calibration gas)
9.5.18
Unhook the calibration gas and reconnect the Calibration O
2
pump box again and
allow at least 5 minutes for the sensor to stabilize. This will show the curve is still
accurate over the full range.
9.5.19
The display should return to 20.7 percent. Remove the tubing from the calibration
port barb. Replace the barb plug/cap.
9.5.20
Remove calibration cover. Two point calibrations are now complete.
9.5.21
Set the main
“SET OXYGEN %” display to the desired setpoint via the up and down
arrows. Allow the reading to stabilize before use.
9.6
OFFSET CALIBRATION PROCEDURE
9.6.1
The second method of calibration does not require a computer. It requires a
calibration gas selected to match the process the chamber is going to be used.
Offset calibration is a single point calibration and should only be used in applications
where having an absolute linear curve throughout the O
2
range is not an issue.
Users should obtain calibration gas at a concentration that matches the value where
the chamber is going to be operated.
9.6.2
To calibrate install the calibration plate. FIGURE 1.
9.6.3
Hookup the calibration gas to calibration port FIGURE 2.
9.6.4
Turn the calibration gas on with the regulator set no more than 3 PSI.
9.6.5
Allow the control to stabilize for at least 5 minutes.
9.6.6
If display does not match what the certified calibration gas states then an offset
calibration needs to be entered.
9.6.7
To enter the offset calibration push and hold both up and down arrow simultaneously
until
“CO” flashes and then the current display value flashes then release the
buttons.
9.6.8
While the current display value is flashing, use the up or down arrow to change the
value in the display to match the calibration gas.
9.6.9
After the value is entered the display will stop flashing after 5 seconds if no buttons
are pushed returning to normal operation. The display should now match the
calibration gas.
9.6.10
Remove the calibration gas and calibration cover. It is important to note that a single
point calibration may cause O
2
readings outside of the calibration gas to be incorrect.
10.
POWER ON THE BACTROX:
10.1
Check power supply against unit plate and make sure they match. Be certain that the fuse is
installed in the power inlet of the unit. Start by attaching the cordset (supplied with the
accessories) to the unit inlet and the building power supply. Attach the female end of the cordset
into the fused and recessed male plug on the rear of the unit and the male plug end of the
cordset into the building supply receptacle.
10.2
Check that the appropriate plumbing connections have been made for N2 and CO2 supply.
10.3
Turn the power switch to the I/ON position. Operating temperature must be set, achieved and
calibrated before C02 connection and adjustments are made. Set the C02 control setpoint to
OFF. To do this, press and release the down arrow Button. The display will flash “SP” and then a
number. While the number is flashing, press the down arrow button and hold it down until the
display is flashing “OFF”, then release the button. Then press the down arrow until the CO2
setpoint is “OFF”.
10.4
Muting Audible Alarms
: Powering the unit on prior to calibration may activate the built in alarm
system. To mute the alarm hold EITHER the up or down button until the “mute” indicator
activates.
