By World Health Organization
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Additional info for Maintenance Manual for Laboratory Equipment 2ed
Measurement cell is inadequately assembled. 28 M A I N T E N A N C E M A N U A L F O R L A B O R ATO R Y E Q U I P M E N T BASIC DEFINITIONS ASTM. American Society of Testing and Materials. Calibration. Determination of the correct value of an instrument’s reading by measurement or comparison against a standard or norm. A balance is calibrated by using standard weights. Certified masses. Masses conforming to the tolerance defined by the certification bodies. The ASTM classes 1 to 4 standards are those most widely used and must be used (a compulsory reference) for performing the calibration routines.
Insulated Room temperature up to 100 °C with accessories and/ or agitation systems (with water). WATER BATH CONTROLS Water baths generally have very simple controls. Some manufacturers have incorporated controls with microprocessors. They vary depending on the type of bath. The diagram of a basic water bath’s control panel is shown next. Figure 18. Water bath controls 4. Screen 5. On Pilot 1. On and Oﬀ Switch 2. Menu Button 6. Temperature Scale Pilots (oC/oF) 3. Parameter Adjustment Buttons The control panel has these elements: 1.
Process. Verify that the changes and selections are done according to the manufacturer’s instructions. Repeat the selection or change. again. The balance’s reader is unstable. There is vibration on the surface of the table/counter. Place the balance on a stable surface. The front door of the balance is open. Close the front door to measure. The RS232 interface does not function. The interconnection cable is maladjusted. Check the connection of the interconnection cable. The screen shows incomplete readings or is locked.
Maintenance Manual for Laboratory Equipment 2ed by World Health Organization