Gow-Mac 580 series, Operating Manual

Page: 11 / 68

Series 580 TCD Gas Chromatograph
September 2017, Rev. 5 11
IMPORTANT!
Your new Series 580 TCD Isothermal Gas Chromatograph contains one of the following detector/
fi lament confi gurations:
_____ Single Carrier TCD _____ Dual Carrier TCD
with _____ WX (rhenium-tungsten)
_____ WXB (rhenium-tungsten, inverted header – dual carrier TCD only)
_____ W2B (tungsten, inverted header – dual carrier TCD only)
_____ W2X (rhenium-tungsten, dual helix)
_____ AuW (gold sheathed tungsten)
_____ Ni (nickel)
_____ WX7 (low current, high sensitivity rhenium-tungsten)
FOLLOW THE PRESCRIBED BRIDGE CURRENTS AND CELL TEMPERATURES FOR
YOUR PARTICULAR DETECTOR AND SET OF FILAMENTS (REFER TO CHARTS 5-1 thru 5-5
IN THIS MANUAL). FAILURE TO REMAIN WITHIN THE STATED LIMITS WILL CAUSE
FILAMENT BURN OUT.
RECOMMENDED STARTING BRIDGE SETTINGS FOR HELIUM
WX fi laments ..........................100 mA
AuW fi laments ..........................100 mA
Ni
fi laments ..........................100 mA
WX7 fi laments .......................... 80 mA
FILAMENT OPERATING NOTES
1. Filament life may be extended by operating at low current and low cell temperatures. The
cell temperature should only be as high as needed for samples used, and current should
be as low as possible consistent with sensitivity required. It is better to operate the system
at an attenuation of 1x or 2x at low bridge currents than at higher currents with higher
attenuation.
2. Sensitivity increases 4 to 8 times as fi lament current increases by a factor of 2. However,
increasing fi lament current excessively results in baseline instability and possible fi lament
burnout. Care must be observed in arbitrarily changing bridge current.