4-4
Brooks
®
Digital MFC's & MFM's
Section 4 Maintenance &
Troubleshooting
Installation and Operation Manual
X-TMF-SLA5800-Series-RevB-MFC-eng
Part Number: 541B187AAG
June, 2016
2. Verify that the process gas connections have been made correctly, and
that they have been tested for leaks.
3. If the Mass Flow Controller appears to be functioning but cannot
achieve Setpoint, verify that there is sufficient inlet pressure and
pressure drop at the controller to provide the required flow.
This section contains suggestions to help diagnose simple MFC/MFM
related problems in the gas distribution system and answers commonly
asked questions.
Remove the sensor connector from the PC Board for this procedure.
OHMMETER CONNECTION
RESULT IF ELECTRICALLY FUNCTIONAL
Open circuit on ohmmeter. If either heater (1) or
Pin 1 or 4 to meter body
sensor common (4) are shorted, an ohmmeter
reading will be obtained.
Pin 4 to Pin 2
Nominal 1100 ohms reading, depending on
Pin 4 to Pin 3
Pin 5 to Pin 1
Nominal 1000 ohm reading.
Pin 6 to Pin 7
Nominal 580 ohm reading.
temperature and ohmmeter current.
SENSOR
SCHEMATIC
PIN
NO.
FUNCTION
1
Heater
Upstream
2
Temperature
Sensor (Su)
Downstream
3
Temperature
Sensor (Sd)
4
Sensor Common
5
Heater Common
6
Thermistor
7
Thermistor
Table 4-1 Sensor Troubleshooting