OPERATING MANUAL OXYGEN MONITORING SYSTEM
OMS 420
20
9
Operation
9.1
Start-up
Prior to start-up, use the following check list to verify that all conditions are set for proper start-up:
Checklist transmitter
•
Transmitter removed from the probe? (Note: always power up with transmitter removed from the probe/stack!!)
•
Cast cover closed and screwed on?
•
Transmitter easily accessible and visible?
•
Ambient temperature around transmitter electronics in operating range of 0 °F to 140 °F (-20°C to 60 °C)?
•
Correct location of transmission cable (not in close proximity to high power supply cables or engines)?
•
Connection for power supply connected properly?
•
Signal connection connected properly?
•
Power supply (factory provided line power fuse) switched on?
•
Start up considerations:
Wiring:
Most problems are due to incorrect wiring. Please double check the wiring.
Shield should be grounded only at one side of the cable.
Leaks:
Check the calibration inlet port plug for correct fit.
Insulation:
Check that the mounting flange has been properly insulated to prevent gas condensation.
Temperature:
Check mounting flange temperature: min. 160 °F (70 °C) and max. 300 °F (150 °C).
Check ambient temperature of transmitter for max. 100 °F (+60 °C).
Note:
If flange temperature at site with mounted probe and transmitter is below
160 °F
(70 °C)
it is necessary to use a flange heater (ask MRU) to prevent condensation!!!
After power is switched on, the MRU logo and model of the unit will be displayed!
9.2
Warm-up
Warm-up time: minimum 30 minutes
LCD will display a time count down for 30 minutes.
During warm-up, some inside measured values (heaters current and voltages) will be compared with credible thresholds and in
case of “out-of-range”, an error message will be displayed. After countdown, if everything is OK, the message will change from
“please wait” to the main measuring menu.
The “SKIP” function is used only for service purposes, to allow the operator to access other unit functions without waiting until the
end of warm-up interval time. During this time, measurement values are not credible.
During warm-up, all other menus (info, service and setting) are accessible.
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