Petroleum and liquid petroleum products. Measurement of level and temperature in storage tanks by automatic methods - Measurement of level in atmospheric tanks1 Scope This part of ISO 4266 gives guidance on the accuracy, installation, commissioning, calibration and verification of automatic level gauges (ALGs), of both intrusive and non intrusive types, for measuring the level of petroleum and petroleum products having a Reid vapour pressure less than 100 kPa, stored in atmospheric storage tanks. This part of ISO 4266 is not applicable to the measurement of level in refrigerated storage tanks with ALG

The accompanying technical report IEC 1170

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