Zeroing The Gf40/Gf80 Series - Brooks Instrument GF40 Serie Manual De Instalación Y Funcionamiento

Installation and Operation Manual
X-TMF-GF40-GF80-Series-MFC-eng
Part Number: 541B161AAG
August, 2012

2-16 Zeroing the GF40/GF80 Series

6. Close the GF40/GF80 Series and wait two minutes.
7. Read the output signal of the GF40/GF80 Series. This output signal is
the initial flow in percent of full scale. The output signal should be 0.0
(± 0.1%). If the output signal is too high, re-zero the GF40/GF80 Series
as described in Section 2-16.
Make sure you perform the zeroing setup process outlined in
Section 2-15 before zeroing the GF40/GF80 Series.
Shut-off valves, whether upstream or downstream from the GF40/GF80
Series, should be programmed to turn on before the GF40/GF80 Series is
turned on and turned off after the GF40/GF80 Series is turned off.
1. Allow time for gas pressure to equalize across the MFC's internal control
valve to ensure gas movement.
2. Press and hold down the Zero button, shown in Figure 2-4, for a mini-
mum of 5 seconds.
Figure 2-4 Zero Button Accessible at Top of Device
Section 2 Installation
®
Brooks GF40/GF80 Series
NOTICE
Zero button
2-9