3-23
Brooks
®
Models 5964, 5850EM
Section 3 Operation
Installation and Operation Manual
X-TMF-5964-5850EM-MFC-eng
Part Number: 541B121AHG
November, 2008
Figure 3-14 Response Adjustment
c1.If the flow signal decays to -0.05 to -0.5 Volt, then rises to zero Volts,
the anticipate potentiometer properly adjusted.
c2.If the flow signal decays rapidly and goes below -0.5 Volt before
rising to zero Volt, the anticipate potentiometer must be adjusted
clockwise and Steps a and b repeated.
c3.If the flow signal decays slowly and does not go below -0.5 Volt, the
anticipate potentiometer must be adjusted counterclockwise and
Steps a and b repeated.
Enhanced Response PC Board Adjustment #2
(specification guaranteed)
Note: Adjustment of the response circuitry to obtain a flow performance to
be within 2% of final value in less than one second after command change
of 0-100% requires the use of a
fast response flowmeter
(less than 100
millisecond response to within 0.2% of final value) in series with the Model
5964/5850EM and a storage oscilloscope or recorder.
a. Set the command to zero percent flow rate (0.000 V) and allow the flow
signal output to stabilize (30 seconds minimum). Step change the
command to 100% of flow (5.000 V) and record the output signal from
the
fast response flowmeter
.
b. This flow signal should overshoot above the final value, then overshoot
below the final value.
b1.If the signal from the
fast response flowmeter
does not overshoot
the final value and/or the signal does not reach and stay within ±2%
of final value within 1 second, adjust the anticipate potentiometer
one-half to one turn clockwise. If this signal does overshoot above
the final value then overshoots below the final value by more than
2%, the anticipate potentiometer must be adjusted one-half to one
turn clockwise.
b2.If the signal from the
fast response flowmeter
overshoots above the
final value by more than 2% and does not overshoot below the final
value, then the anticipate potentiometer must be adjusted one-half to
one turn counterclockwise.
