Mass Flow Meter Operation

Series 830/840/860 Instruction Manual	Chapter 3 Operation

Chapter 3 Operation

This chapter covers transducer operation and controller features available on Sierra’s Side-Trak™and Auto-Trak™models. For more information on the advanced digital RS-485 commands available on Auto-Trak transducers, refer to the Series 860 “Auto- Net” Software Addendum included with this manual.

Standard output for all transducers is a linear 0-5 VDC output signal directly corresponding to 0 to 100% of the mass flow full scale range. For mass flow controllers an input signal of 0-5 VDC (4-20 mA optional) allows set point flow control to any desired value within the range of the model. The input signal is a direct linear rep- resentation of 0 to 100% of the mass flow full scale value. A 0 VDC (or 4 mA) set point will cause a condition of 0% flow to occur and a

5.00VDC (20 mA) set point will cause a flow condition equivalent to 100% of flow to occur.

When the transducer is installed and the system has undergone a complete leak check:

1.Apply power. Allow thirty minutes of warm-up time. (When power is first applied, the output signal from the transducer remains fixed at a much higher than normal level until the sen- sor warms up to its normal operating temperature range.)

2.Turn on the gas supply. Perform an initial zero output check (only required for first-time start ups). Set flow to zero. Connect a digital multimeter to V+out (4-20 mA out) and COM termi- nals.

3.Check the reading. If it is not within ±10 mV (±0.10 mA) of zero, adjust the zero potentiometer to zero the transducer. (The zero pot is located behind the upper metal button on the side of the transducer or behind the swing-out plastic door.)

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840, 830, 860 specifications

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