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- Posts: 442
- Joined: Mon Jun 13, 2005 7:03 pm
My FID is not heating. Actually, is is warm to the touch. The setting on the front panel is 300 C and the readout says 300 C but I can hold my fingers on it so it is not 300 C.
Any ideas?
Discussions about GC and other "gas phase" separation techniques.
skunked_once wrote:
... I cannot get the flame to stay lit. Air and hydrogen flows were checked with a bubble flowmeter and are correct (air = 300-330 mL/min and hydrogen = 30-40 mL/min). The ignitor glows and some weak pops result but the flame goes out as soon as the ignitor button is released. Aaaaarrgggg!!! Any ideas would be much appreciated.
skunked_once wrote:
I cannot get the flame to stay lit. Air and hydrogen flows were checked with a bubble flowmeter and are correct (air = 300-330 mL/min and hydrogen = 30-40 mL/min). The ignitor glows and some weak pops result but the flame goes out as soon as the ignitor button is released. Aaaaarrgggg!!! Any ideas would be much appreciated.
dblux_ wrote:
I agree with cleh.
It's not possible that column nut inside oven is 250 degC (provided oven is switched off) and upper housing is cool and can be touched. Temperature distribution across FID is much more uniform.
Problems with flame may be connected with defective temperature sensor as well. When sensor measures temperature below 150 degC FID logic cuts hydrogen and air flow and wait until temperature reaches >150 degC.
Stunt wrote:
... The thermocouple is a cylinder that heats via electric current, and the sensor is a smaller ceramic cylinder. Both insert into the heater block, and the ceramic sensor is generally a piece of crap that breaks as it heats and cools. If you have a secondary FID I would CAREFULLY switch out the entire assembly. Don't break that little ceramic piece or youre out two FIDs. I believe the part isnt very expensive, ~ $250?
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