This particular 7890B features a dual PDHID, Helium Purifying Getter, which is to be used in addition to ultra high purity gas. This is a gas-sampling GC with has a single gas sample introduction bulkhead and is capable of analysis on all 3 detectors concurrently. The PDHID detectors have been tested and are working, the output signal is below 2000 for both.
The carrier gas is one of the most critical gases entering the GC system. Even very pure gas cylinders can contain about 10 ppm of oxygen, water and hydrocarbons. Although these concentration levels are normal, they can be detrimental to a GC system, especially those using ultra sensitive detectors such as the pulse discharge helium ionization detector (PDHID). A typical sign of carrier gas contamination is an erratic baseline, including baseline wandering, drifting, or excessive noise.
Original Quality at Refurbished Prices! Our refurbished analytical instruments have been expertly restored to meet rigid industry standards. GenTech Scientific’s 60,000 square foot facility stocks an extensive multimillion-dollar inventory. Our knowledgeable sales and service team are committed to help you get the right instrument into your lab. Our commitment extends beyond the sale with our warranty and continued service options.
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How GenTech Refurbishes Used Lab Instruments
Every refurbished instrument we sell undergoes a complete electronics inspection and performance evaluation. The instruments undergo in-depth preventative maintenance procedures that include extensive cleaning, detector maintenance, line and pump flushing. Routine maintenance is also addressed and filters, liners, tubing, etc. are all replaced as needed. A full calibration and data verification is performed ensuring our refurbished laboratory instruments are in excellent working condition.
Our expert service engineers and chemists can install and custom-configure the system to be compliant with the methods you plan to run.