3-15
Brooks
®
Models 5964, 5850EM
Section 3 Operation
Installation and Operation Manual
X-TMF-5964-5850EM-MFC-eng
Part Number: 541B121AHG
November, 2008
3-5 Adjustment Potentiometers
All Model 5964/5850EM instruments are factory calibrated for optimum
performance. The only potentiometer recommended for field adjustment is
the Zero. As shown in Figure 3-2, access to the Zero Potentiometer is
provided by removing the plug labeled 'Z'. The Span Adjustment is also
accessible by removing the 'S' plug, however, its adjustment is not
recommended as described below. Adjustment of the remaining
potentiometers necessitates removal of the electronics cover.
Adjusting potentiometers can seriously affect the performance of
the mass flow controller and should only be performed by
properly trained and qualified personnel.
CAUTION
Span
The span potentiometer is used to adjust the full scale setting of the mass
flow controller. An adjustment in the clockwise direction will give less flow
while turning counterclockwise will give more flow. Adjusting this
potentiometer will alter the calibration and is therefore not recommended
unless calibrating the device.
Figure 3-12 Adjustment Potentiometer Location
Span
Linearity
Anticipate
Zero
Response
Note:
1. Linearity, Anticipate and Response Potentiometers
necessitate removal of the electronics cover.
2. Not all Printed Circuit Boards contain
a Response Potentiometer.
Side View
