The operator should be provided with sufficient information about the condition of the machinery to ensure its safe operation. This information can be derived from instruments and condition indicators.Where only a general indication of the state of the equipment is required, qualitative indicators can be used which show an expected normal operating condition with an indication of permitted high or low variations outside the normal range, i.e. temperature, pressure, speed, oil level, etc. These are suitable for most applications where sufficient indication of condition can be given by a mark on an instrument dial or face (safe working pressure of steam boilers).
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