Hazardous Area Oxymitter 5000
5-4
Instruction Manual
IM-106-350C, Rev 2.2
July 2008
TEST POINTS
Test points 1 through 6 allow you to monitor with a multimeter: the heater
thermocouple, the O
2
cell millivolt value, and the process O
2
.
• TP1 and TP2 monitor the oxygen cell millivolt output, which equates to
the percentage of oxygen present.
• TP3 and TP4 monitor the heater thermocouple.
• TP5 and TP6 monitor the process gas or the calibration gas parameter.
CAL LED
The CAL LED is on steady or flashing during calibration. Further information
is available in Section 9: Maintenance and Service.
Keys
INC and DEC. The INC and DEC keys are used to set the values of the
calibration gases. Attach a multimeter across TP5 and TP6. The calibration
and process gases can now be monitored. Pressing the INC or DEC once will
cause the output to switch from the process gas to the calibration gas.
Pressing INC or DEC a second time will increase or decrease the calibration
gas parameter. If the keys have been inactive for one minute, the output
reverts to the process gas. When a calibration has been initiated, the value at
TP5 and TP6 is the % O
2
seen by the cell.
Oxygen levels, as seen on the multimeter, are:
8.0% O2 = 8.0 volts DC
0.4% O2 = 0.4 volts DC
CAL
The CAL key can:
• Initiate a calibration.
• Sequence through calibration.
• Abort the calibration.
NOTE
Refer to Section 9: Maintenance and Service, for calibration instructions.
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