Electronics
Diagnostics
EPC
Potpourri
Harder Potpourri
100
The Ambient Pressure Sensor is located on this board.
What is the Analog and Power Board
100
The test you would use to identify small leaks in SSL system?
What is the inlet pressure decay test.
100
This valve is responsible for providing back pressure to the SSL inlet in split mode.
What is PV2
100
The best starting oven temperature for a splitless method using Hexane solvent.
What is 50C
100
According to the Agilent Gas Clean Filter User Manual, these two traps should be installed on the carrier line.
What is 1. Oxygen 2. Moisture
200
These two pins on the remote port can be used to start the 7890 from an external device.
What is pins 1 & 3
200
What you would check if the TCD exhibits "ringing"
What is the data collection rate. It should be 5Hz
200
The number of AUX EPC modules you can have configured on a 7890.
What is two.
200
Where the TCD reference gas switching valve is located on the 7890.
What is the TCD detector EPC module.
200
What you should do before turning off a GC that has an NPD installed.
What is set the bead voltage to "0" and then "OFF"
300
The two items you should replace if Q205 on the 7890 Analog and Power Board is physically damaged and burnt.
What is the Front Inlet EPC module and A & P Board
300
This is a test you could run if your FID won't light.
What is the jet restriction test.
300
The number of PCMs you can have installed on one 7890 GC if you have 1 AUX EPCs at the same time.
What is 3 PCMs.
300
How you could approximate the purge delay time.
What is divide the liner volume by the column flow rate.
300
The resistance of a 7890 Oven Heater coil on a 240VAC GC - 2950 Watt Oven
What is 26 Ohms.
400
When troubleshooting a "dead" GC, this connector allows you to disconnect the cooling fans, oven flap motor, and cryo valve all together.
What is P18
400
Use this key to determine why the GC is "Not Ready"
What is the STATUS key
400
Each detector EPC module uses this sensor to control the gas flow.
What is a pressure sensor.
400
You could use this operating mode on the SSL or MMI to help accommodate excess solvent vapor volume in a Splitless method.
What is Pulsed Splitless mode
400
The maximum oven temp program rate you could use with a starting temp of 110C going up to 175C if you have a "Fast Oven".
What is 65C/min
500
Name two things you MUST do when upgrading a 7890A to a 7890A+
What is replace the Logic Board and enter the serial number.
500
The test you could use to determine if there was a blockage in the split vent pathway.
What is the Vent Restriction Test.
500
You are controlling your column in this mode if your PCM is installed in EPC 6 position and you have a capillary column configured to channel 1.
What is Forward Pressure Control.
500
The split ratio if Total Flow is 73.7ml/min, column flow is 0.7ml/min, and septum purge is set to 3ml/min.
What is 100:1
500
The maximum number of columns that you can configure on a 7890 GC.
What is 6
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