Brooks Instrument 5850EM - Manual (Page 55)

4-5
Brooks ® Models 5964, 5850EM
Section 4 Maintenance Installation and Operation Manual
X-TMF-5964-5850EM-MFC-eng
Part Number: 541B121AHG
November, 2008
Table 4-2 Sensor Troubleshooting
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 1200 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