Series 830/840/860 Instruction Manual

Chapter 3 Operation

 

 

Motor-Operated Rotary Valve Controllers

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

1.Make sure the valve set point is zero before applying power.

2.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.)

3.Turn on the gas supply. Verify that no flow exists. 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 terminals.

4.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.)

5.Adjust the controller set point to the desired flow rate.

All motor-operated rotary valves seek a “deadband” where the flow is identical to the set point within specified tolerances. Keep this in mind when checking the instrument’s performance. For in- stance, a 100 scfm flow controller may have a set point of 2.500 volts (50 scfm) and a flow indication of 2.550 volts (51 scfm). This controller is working correctly, since the difference between the flow and the set point is within 1 scfm, which is the specified accu- racy of ±1% of full scale (0.01 x 100 scfm = 1 scfm). The width of the deadband varies with the valve size and range of each control- ler.

During operation, the motor runs only when it needs to. If the pres- sure differential across the valve is insufficient to obtain set point, the valve will open fully and the motor will cease to run. Con- versely, if the set point is zero, the valve will close, and the motor will cease to run. In either case, there will be no control action. Check for adequate pressure differential and that set point command voltage is present at the motor operator connector.

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Sierra 860, 840, 830 instruction manual Motor-Operated Rotary Valve Controllers
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840, 830, 860 specifications

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