Oxigraf O2iM NEMA 4X Oxygen Analyzer
February 13, 2007 08-0427-B0, Manual, O2iM.doc Page 20
as N2O and CO2. The measurement noise level is higher than LN mode however, which gives
accurate results with low noise for N2 – O2 mixtures.
5.6 O2 Low Point Calibration Gas
The low O2 calibration gas setting specifies the concentration of oxygen for low point cal. Room air
can be used as a cal gas (20.8% O2) but it should be dried to prevent errors due to dilution by water
vapor.
5.7 O2 High Point Calibration Gas
The high O2 calibration gas setting specifies the concentration of oxygen for high point cal.
5.8 Autocal Period
If the autocal option is installed this parameter sets the time period between autocal cycles. If the
autocal period is modified then the next autocal cycle will start 5 seconds after returning to Run
mode.
5.9 Autocal Valve Delay
This parameter sets the delay from turning on the cal gas to start of the analyzer calibration cycle.
The delay allows time for the cal gas to completely fill the measurement cell.
5.10 Autocal Mode
The autocal mode parameter specifies the type of autocal cycle to perform. The options are Off, Cal
1, Cal 2, and Cal 1 + Cal 2. The last option may not be available depending on the factory
configuration. Note that the cal gas must be connected to the cal gas ports even if the Autocal Mode
is set to Off.
5.11 Autocal Level B Enable
The level detector B will trigger an autocal if this parameter is set to "On". Autocal cycles will be
executed at a maximum rate of 10 per hour if the level B detector is continuously active. This option
is useful to correct drift that may cause false activation of the level A detector in oxygen deficiency
monitor applications.
5.12 O2 Current Output Setpoints
The O2 Current Ouput Setpoints specify the oxygen concentration corresponding to 4 mA and 20
mA of output current. For example, set O2 4 mA Iout to 0.00 and 20 mA O2 Iout to 100.00 to scale
the 4 to 20 mA current output for 0 to 100% O2.
5.13 Flow Setpoint
The flow setpoint parameter sets the target flow rate for the sample flow controller. Adjust the flow
setpoint to zero to permanently turn off the sample pump.
5.14 Pump State
The Pump State setting is used for testing to enable the flow controller, turn the pump off, or set the
pump to maximum flow. The Pump State setting is not saved in nonvolatile memory and will be
restored to the flow controller enabled state on power-up. To permanently turn off the pump adjust
the Flow Setpoint to zero.
To Next Page
Loading...
General