| M300EU |
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| TROUBLESHOOTING & REPAIR |
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| (Addendum to M300EU Manual - P/N 04145) |
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| Table | Warning Messages – Indicated Failures (cont.) |
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| WARNING | FAULT CONDITION | POSSIBLE CAUSES |
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| MESSAGE |
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| Sample flow rate is | Failed sample pump |
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| Blocked sample inlet/gas line |
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| SAMPLE FLOW | <1400 cm3/min |
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| WARN |
| or | Dirty particulate filter |
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| Leak downstream of critical flow orifice |
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| 3 |
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| > 2200 cm /min. | Failed flow sensor/circuitry |
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| If sample pressure is < 10 |
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| Sample Pressure is | o Blocked particulate filter |
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| o Blocked sample inlet/gas line |
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| <10 |
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| SAMPLE PRES | o Failed pressure sensor/circuitry |
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| Normally 29.92 |
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| WARN | decreasing at 1 | If sample pressure is > 35 |
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| o Pressurized sample gas. Install vent |
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| altitude (with no flow – pump |
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| disconnected). | o Blocked vent line on pressurized sample/zero/span gas |
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| supply |
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| o Bad pressure sensor/circuitry |
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| Ambient temperature outside of specified range |
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| Sample temperature is < 10oC or > | Failed bench heater |
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| SAMPLE TEMP | Failed bench temperature sensor |
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| WARN |
| 100oC. | Relay controlling the bench heater |
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| Failed relay board |
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| I2C buss |
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| GFC wheel stopped |
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| Occurs when CO Ref is <1250 | Failed sync/demod board |
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| If status LED’s on the sync/demod board ARE flashing the |
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| mVDC or >4950 mVDC. |
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| SOURCE | cause is most likely a failed: |
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| WARNING | Either of these conditions will result | IR source |
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| Relay board |
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| in an invalid M/R ratio. |
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| I2C buss |
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| IR |
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| This message occurs at power on. If you have not cycled the |
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| The computer has rebooted. | power on your instrument: |
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| SYSTEM RESET | o Failed +5 VDC power, |
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| o Fatal error caused software to restart |
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| o Loose connector/wiring |
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| Blocked cooling vents below GFC Assembly. Make sure that |
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| adequate clear space beneath the analyzer. |
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| Analyzer’s top cover removed |
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| WHEEL TEMP | The filter wheel temperature is | Wheel heater |
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| WARNING | controlled at 68 ± 2 °C | Wheel temperature sensor |
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| Relay controlling the wheel heater |
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| Entire relay board |
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| I2C buss |
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05514 Rev A1 | 61 |