SRI GC DETECTORS - PID - PHOTO IONIZATION DETECTOR
- Responds to carbon double bonds and aromatics
- Detects levels to 10ppb
- Mandated in EPA Methods
- Long lamp life
The PID detector consists of an industry-standard UV lamp mounted on a thermostatted low volume flow-through cell. The temperature is adjustable from ambient to 250°C. The 10.6 electron volt UV lamp emits energy at a wavelength of 120 nanometers, which is sufficient to ionize most aromatics ( benzene, toluene, xylene, etc. ) and many other molecules (H2S, hexane, ethanol) whose ionization potential is below 10.6 ev. Methanol and water, for instance, have ionization potentials greater than 10.6ev and do not respond on the PID.
Detection limits for aromatics are in the low picogram range ( ppb ) and because the PID is non-destructive, it is often run in series with another detector ( FID/DELCD ) for multiple chromatograms from a single injection. Use of the PID is mandated in several EPA methods ( 8021, TO-14 etc. ) because of its sensitivity and selectivity. The PID is also able to run on air carrier, which can be useful in situations where no gas ( helium, hydrogen, nitrogen ) is available, or stream monitoring applications where no column is used to separate compounds but rather the entire stream of sample is directed through the detector.
Click here for printable HID technical overview (.pdf).
Up to six detectors can be mounted on the 8610C GC Mainframe.
SRI GC DETECTOR OPTIONS
Fourteen detector combinations are available for mounting on the SRI Models 8610C and 310 GC mainframes. You can also upgrade your current GC or add more analytical power to your lab with these detectors as Stand-Alone units on the Model 110 detector chassis.
Up to six detectors may be mounted along the right hand side of the 8610C GC's column oven and used simultaneously (although some rare combinations of detectors may conflict because of space limitations). Each detector is equipped with a thermostatted heater block for temperature stability, electronic pressure controlled (EPC) support gases, such as hydrogen and air for the FID, and internal amplifier electronics. Select your detector type(s) based on your particular measurement application, detection limit required, matrix interferences, and/or regulatory guidelines.
All detectors require factory installation.