SRI GC DETECTORS - HID - HELIUM IONIZATION DETECTOR
- Universal detector (except for neon)
- Detects levels from 1-2% down to 10ppm
- Requires only helium carrier and make-up gas
- Perfect compliment to the TCD
The Helium Ionization Detector ( HID ) is a "universal" detector which responds to all molecules. The HID requires helium carrier and make-up gas, and delivers sensitivity in the low ppm range. Unlike an FID however, the HID needs no hydrogen or air. It is especially useful in combination with a TCD detector because the TCD is not sensitive enough to detect low ppm concentrations, while the HID saturates in the low percent range, so together it is possible to cover 1ppm to 100%.
The HID is particularly useful for volatile inorganics like NOX, CO, CO2, O2, N2, and H2 which do not respond on FID or other detectors. Many labs are reluctant to store hydrogen fuel gas for safety reasons, so the fact that the HID needs only helium is a significant advantage.
Unlike other HID designs, the SRI HID can be easily disassembled for cleaning. The HID incorporates a low cost, easily replaceable electrode which supports a low current arc through the helium make-up gas flow. This elevates the surrounding helium to a meta-stable state. When the meta-stable helium molecules collide with the sample molecules as they elute from the column, the sample molecules are ionized and attracted to a collector electrode, amplified and output to the data system.
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.