CETAC M-7600 Mercury Analyzer Operator's Manual

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Operator’s Manual Chapter 6: Troubleshooting the Mercury Analyzer Cannot Zero Instrument Perform the following steps: ‣ Be sure instrument is fully warmed up with the peristaltic pump running at the method rate. The warm up time is dependent on the chosen method: ultra-trace may need at least 1 hour with the lamp and pump on; a normal µg/L range may only need 15 to 30 minutes. See “Starting the System” on page 81. ‣ Check that both cells (sample & reference) and cell end caps are clean and “dry” (no liquid or dried stannous chloride obstructing the gas flow or the optical beam). See page 107 for cleaning instructions. ‣ Check that both cell windows are clean. See page 107 for cleaning instructions. "Integration Adjustment Reached" Messages These messages can result if the M-7600 power is cycled too rapidly. If this happens, the lamp current can get "stuck" at 6.5 mA. Always allow at least 15 seconds before turning the M-7600 back on. 1654: Upper limit integration adjustment reached Cleaning the optics is recommended. This message means too little light is reaching the detector, and the system cannot compensate by increasing the integration period. ‣ Turn the M-7600 off. Wait at least 15 seconds, then turn it back on. ‣ Clean the sample cells. ‣ Check the lamp and replace it if needed. 1655: Lower limit integration adjustment reached Contact CETAC technical support. This message means too much light is reaching the detector, and the system cannot compensate by decreasing the integration period. ‣ Turn the M-7600 off. Wait at least 15 seconds, then turn it back on. ‣ Check that the sample cells are installed. ‣ Adjust the lamp current. Drifting Baseline The system might not be thermally stable because of insufficient warm up time. Wait longer. ‣ Check that gas pressures are stable and correct. Variable gas flow can cause the baseline to drift. Check that no stannous chloride encrustation exists in gas tubes/fittings after a GLS overflow accident. See “Removal or Inspection of the Sample Cell” on page 105. 140
CETAC QuickTrace M-7600 Mercury Analyzer Chapter 6: Troubleshooting the Mercury Analyzer ‣ Check that the gas hoses are not pinched. ‣ Check that the lamp block heater works. The lamp block should be hot (50°C) to touch. Turn the lamp power off. Remove lamp-housing cover and touch the lamp block momentarily to verify that it is hot. ‣ With the Hg lamp off, check that the EOFM filter is not dirty (inspect it with a dentist’s mirror and low angle flashlight). ‣ Check that the lamp current is not too high using the QuickTrace M-7600 instrument controls. High current indicates a worn-out lamp, if all the windows and optics are clean. ‣ Replace the Perma Pure ® dryer cartridge. Low Absorbance or No Mercury Response ‣ Ensure the Hg lamp is on. ‣ Check all liquid uptake rates and gas flow. If there is no liquid or gas flow, see page 141. ‣ Check that the reagent tube is in the reagent bottle. ‣ Check that SnCl 2 is active, not empty, not oxidized or precipitated. ‣ Check that standards have the correct Hg concentrations in them. ‣ Check the liquid tubes for kinks or clogs. ‣ Check that standards have 7% HCl in them. ‣ Check the gas flow at the GLS outlet. ‣ Check the gas flow at the sample cell outlet. ‣ Check that the gas flow at the KMnO 4 trap outlet; does not drop in pressure or flow, this indicates an upstream block or a leak. ‣ Check all plumbing connections for correct location and proper seal. ‣ Replace the Perma Pure ® dryer cartridge. ‣ Mechanically block the sample beam optical path (such as with a business card) and see if absorbance goes full scale (≥ 8,000,000 µabs). This task can be accomplished in instrument controls by starting the strip chart recorder. ‣ Reboot the system: shut down the software, and power down the QuickTrace M-7600 and autosampler. Restart, and check the signal. No Liquid or Gas Flow No Sample or Rinse Flow ‣ Increase the tension on the sample pump tubing to start flow. ‣ Be sure the sample, SnCl 2, and “Liq. Mix” tubes are not pinched off anywhere and restricting flow. 141
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CETAC M-7600 Mercury Analyzer Opera
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Contents 1 Introduction ...........
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M-7600 Mercury Analyzer Operator's
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1 Introduction Overview The CETAC Q
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CETAC QuickTrace M-7600 Mercury Ana
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2 Preparing for Installation Instal
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3 Installing the Analyzer Installat
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4 Using the Analyzer Operation of t
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