Siemens SITRANS LT500 - Page 79

Commissioning
6.5 Local commissioning
SITRANS LT500 with ultrasonic transducer inputs
Compact Operating Instructions, 02/2024, A5E52021877-AA
79
Step: Primary measuring device
Primary measuring device (PMD)
Sets the type of primary measuring device (PMD) used.
Setting
• Exponential devices
• Rectangular flume BS 3680/ISO 4373
• Round nose horizontal crest weir BS 3680/ISO 4373
• Trapezoidal flume BS 3680/ISO 4373
• U-flume BS 3680/ISO 4373
• Finite crest weir BS 3680/ISO 4373
• Thin plate rectangular weir BS 3680/ISO 4373
• Thin plate V-notch weir BS 3680/ISO 4373
• Rectangular weir contracted
• Round pipe
• Palmer-Bowlus flume
• H-flume
• Custom
Default
Exponential devices
If PMD is not listed, set to "Custom" and use a volume flow calculation.
Step: Method of flow calculation
Method of flow calculation
Sets method of flow calculation.
Setting
• Absolute
• Ratiometric
Default
Absolute
Set this parameter to "Ratiometric" only if the primary measuring device (PMD) supports
ratiometric calculations. (Note that Palmer Bowlus Flume and H-Flume support ratiometric
calculations only.)