The membrane assembly should be replaced after a maximum 6 months of use. Medica guarantees this item’s performance for 3 months of use, but the frequency of replacement may depend on your sample volume or sample type (high volume of lipemic or high protein samples may necessitate more frequent changes of the mem-brane assembly). EasyLyte customers testing 100 or more patient samples per week should replace the membrane assembly after 3 months of use. When replacing the membrane assembly, install new internal filling solution at the same time.
A Na low with a simultaneous K high message after calibration, low or erratic readings on controls or samples, and some noise errors may indicate a problem with the membrane assembly.
A The membrane assembly should be checked for air bubbles on the “window”. Tapping the electrode housing may help to dis-lodge any bubbles. If this is not successful, remove the electrode housing and invert it a couple of times, being sure to put your finger over the fill plug to prevent the internal filling solution from leaking out. At the same time, the electrode pins and jacks should be inspected to make sure they are dry and clean, partic-ularly the reference electrode pin and jack if low or erratic read-ings occur.
B If bubbles are not present and the analyzer passes the FLUID FLOW TEST?, the membrane assembly should be changed.
This is particularly true in the case of simultaneous low sodium and high potassium cal values.
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Electrodes
Electrodes with low calibration values (below 50 for Na/K/Li, 40 for Cl, 45 for pH, and 20 for Ca), Drift, or Noise messages may indi-cate electrode failure. Electrodes with HIGH calibration values mes-sages most often indicate a membrane assembly/disposable refer-ence electrode failure.
For Na/K/Ca/pH analyzer, when the electrode housing is removed for electrode replacement, maintenance, troubleshooting, etc., wait for 30 minutes after reinstallation before calibrating the analyzer to insure proper electrode temperature. K LOW, Na LOW, Ca LOW or pH LOW (calibration value below 50 for Na/K, below 45 for pH, below 20 for Ca), DRIFT, or NOISE messages may indicate electrode failure. K HIGH, Na HIGH, Ca HIGH or pH HIGH most likely indicates a reference electrode failure.
A The calibration values (slopes) of the electrodes should fall within a range of 50 to 64 for Na/K/Li, 40 to 64 for Cl, 45 to 64 for pH, and 20 to 34 for Ca.
If they fall outside of this range, the out-of-range value(s) for “K”,
“Na”, “Cl”, “Li”, “pH” or “Ca” will be flagged. If the analyzer does not calibrate the first time, it will automatically recalibrate.
At the end of the calibration cycle, the slope values will be dis-played for each electrode. The EasyLyte will permit sample analysis only for the electrodes that are calibrated successfully.
If the pH electrode fails calibration, the normalized calcium value will not be reported.
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B A Na LOW, DRIFT, or NOISE message indicates that an additional WASH? cycle may be necessary to condition the sodium electrode (not available for Na/K/Ca/pH). An on-demand WASH? can be performed by proceeding to *OPER FUNCTS?*in the SECOND MENU? and pressing Yes to WASH?. After the WASH?, calibrate the analyzer again. If the sodium calibration value remains low, refer to paragraph G. For Na/K/Ca/pH, proceed to DAILY RINSE? and press yes. After the rinse cycle, calibrate the analyzer again. If the sodium cali-bration value remains low, refer to paragraph G.
C A K LOW, DRIFT, or NOISE message may indicate that the potassium electrode needs replacing. Before doing so, perform a daily cleaning cycle, as described under DAILY CLEANER?.
Next, perform a calibration. If the potassium calibration value remains low, replace the potassium electrode. Do not clean the potassium electrode with the sodium electrode brush tool.
T R O U B L E S H O O T I N G
SODIUM ELECTRODE BRUSH TOOL
Na D A low, drift, or noise message for chloride only, lithium only,
cal-cium only or pH only may indicate that replacement of the spe-cific electrode is necessary. Before doing so, try performing a daily cleaning/rinse cycle, as described under DAILY CLEANER?/DAILY RINSE?. Next, perform a calibration. If the calibration value remains low, replace the electrode.
E If all electrodes have low or high calibration values, the problem is most likely with the membrane assembly or the reference elec-trode (on the Na/K/Ca/pH analyzer, the problem may be the disposable reference electrode). It is also possible that an incor-rect solutions pack is being used. For example, if a 400 mL solu-tions pack is installed, but the operator selects 800 mL? in
*PACK USAGE?*, the EasyLyte will not calibrate successfully.
F If drift or noise messages appear for all electrodes, there is most likely a Flow problem (refer to flow problems) or membrane assembly problem (refer to membrane assembly). Also, inspect the electrode pins and jacks, including the reference electrode pin and jack, to insure that they are dry and clean. After reassembly, the analyzer should be purged and calibrated.
Do not perform the cleaning procedure described in paragraphs G as a preventative measure. Do not clean the electrodes, as
described, if their Cal values are within the acceptable range. Do not clean the Potassium electrode with the sodium electrode brush tool under any circumstances.
G In some cases, the sodium electrode calibration value may drop prematurely due to protein build-up on the inside surface of the sodium electrode. Attempt protein removal by pushing the brush tool (found in the Troubleshooting Kit) through the sodium elec-trode. Gently pull the brush back out of the elecelec-trode. Reinstall the electrode, perform SOL’N PURGE?, DAILY
CLEANER?/DAILY RINSE?, then CALIBRATE NOW?. If the sodium electrode Cal value remains low, install a new sodium electrode. Do not use the brush to clean the potassium, chloride, lithium, calcium or pH electrodes.
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