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SFRI ISE 3000/4000 Analyzer for Service Engineers

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1. 1. What is the primary technology used by the ISE 4000 to measure electrolytes?
a) Spectrophotometry b) Ion-Selective Electrode (ISE) Potentiometry c) Chromatography d) Chemiluminescence
2. 2. Which sample type is NOT recommended for use with the ISE 4000 without special preparation?
a) Heparinized plasma b) Serum c) Urine d) Whole blood
3. 3. Before opening the instrument for maintenance, what is the MOST important first step?
a) Put on gloves b) Run a cleaning cycle c) Disconnect it from the power supply d) Note the serial number
4. 4. What is the function of the Liquid Distribution Valve?
a) To heat the samples b) To switch the fluid path between Sample, Std A, and Std B c) To print the results d) To move the sample probe up and down
5. 5. Poor grounding of the instrument most commonly causes unstable results for which analyte?
a) Potassium (K+) b) Sodium (Na+) c) Chloride (Cl-) d) pH
6. 6. What does the "Liquid Positioner" (optical coupler) do?
a) Measures the voltage of the electrodes b) Detects the liquid segment and checks for bubbles c) Cleans the sample probe d) Controls the peristaltic pump speed
7. 7. If the slope for all electrodes (K, Na, Cl) is low (<20mV), what should you check first?
a) The Na electrode membrane b) The peristaltic pump tube c) The filling solution of the Reference electrode d) The printer paper
8. 8. Which maintenance task should be performed WEEKLY?
a) Change the reference membrane b) Check electrode filling levels and run a deproteinization cleaning c) Replace the entire electrode assembly d) Recalibrate the RS-232 interface
9. 9. The "CAL - AUTO" function on the main menu:
a) Only measures a QC solution b) Calibrates the instrument with Std A and Std B and updates correction factors c) Adjusts the physical position of the electrodes d) Prints out all previous results
10. 10. What is the purpose of the "Valve" test in the extended service menu?
a) To adjust the internal clock b) To check the aspiration of Std A/Std B for blockages or leaks in the valve c) To reformat the internal memory d) To test the printer functionality