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Troubleshooting
Connector Pin Descriptions
6-22
Model 146i Instruction Manual
Table 6-7. Measurement Interface Board Connector Pin Descriptions, continued
Connector
Reference
Label
Designator
AMB TEMP
J12
PERM TEMP
J13
PERM OVEN
J14
MFC1
J15
MFC2
J16
CONNECTOR BD
J17
PERM 1
J18
Pin
Signal
Description
2
+RS485 from Motherboard
3
-RS485 from Motherboard
1
Ambient Temperature Thermistor
2
Ground
1
Perm Oven Gas Thermistor
2
Ground
1
Perm Oven Heater On/Off
2
+24V
3
Perm Oven Thermistor
4
Ground
1
Mass Flow Controller 1 Input
2
Mass Flow Controller 1 Output
3
Ground
4
+15V
5
-15V
6
Ground
1
Mass Flow Controller 2 Input
2
Mass Flow Controller 2 Output
3
Ground
4
+15V
5
-15V
6
Ground
1
Gas A Solenoid Control
2
Gas C Solenoid Control
3
+24V
4
Gas E Solenoid Control
5
Z – A Solenoid Control
6
Gas B Solenoid Control
7
Gas D Solenoid Control
8
+24V
9
Gas F Solenoid Control
10
EXT/INT Solenoid Control
1
+24V
Thermo Fisher Scientific
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