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Series 830/840/860 Instruction Manual | Chapter 1 Introduction |
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Figure 1-3. Sensor Temperature Distribution
Figures 1-2 and 1-3 show the mass flow through the sensor tube as inversely proportional to the temperature difference of the coils. The coils are legs of a bridge circuit with an output voltage in direct pro- portion to the difference in the coils’ resistance; the result is the tem- perature difference (∆T). Two other parameters, heat input (H) and coefficient of specific heat (Cp) are both constant. The resulting out- put is nearly linear over the transducer’s normal operating range.
Figure 1-4. Linear Range of the Transducer’s Output Signal
For mass flow controllers, once the gas flows through the monitor- ing section, it is then controlled by the
For higher flows of 50 to 200 scfm, controllers are equipped with Si- erra’s