Turndown Ratio describes the difference between the highest and lowest possible span of measurement output which can be set for a sensing device with a rangeable output signal such as 4 to 20mA output which is HART enabled.
Turn-down ratio refers to rangeable output devices and indicates how much the output setting can be changed.
e.g. A 10:1 turndown ratio on a 1 bar gauge pressure transmitter would allow the following:
- Highest range setting: 0 to 1 bar absolute = 4 to 20mA
- Lowest range setting: 0 to 100 mbar absolute = 4 to 20mA
- 100 mbar abs vacuum transmitter with a 5 bar overpressure
- 41X High Precision Low Range Pressure Transmitter
- PD39X High Differential Pressure Transmitter
- DS200 Combined Pressure Switch, Gauge and Sensor
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