The Model 4400 In-Stream Hydrogen Sulfide Analyzer is used to continuously verify the H2S content of a natu- ral gas sample for the presence of 0-100 ppm levels of Hydrogen Sulfide. This system is used to insure that H2S levels in natural gas collection lines remains at ac- ceptable levels to help guard against the corrosive ef- fects of H2S on compressors, pipelines and process equipment. It is intended for continuous monitoring prior to the addition of odorants to the gas.
The 4400-10 receives a low pressure natural gas slip- stream sample. A flow controller in the system delivers a constant flow to the gas sensor and allows for easy calibration and maintenance. An in-line coalescing fil- ter protects the system from sample contaminants.
A 4-20 mA linear signal proportional to sample concen- tration is provided from the sensor assembly. This sig- nal can interface with a Sierra Monitor Model 4107-99 Transmitter/Display, a single channel controller, the Sentry multi-channel controller or most industry stan- dard controllers or PLCs.
The Model 4107-99 Transmitter/Display option can ac- cept the 4-20 mA signal from the Model 4400-10 and provide digital display of the H2S concentration, dual concentration alarm contacts, 4-20 mA output and se- rial MODBUS communication. The Model 4107-99 can be mounted directly to the Model 4400 H2S Analyzer of at a remote location. The Model 4107-99 is in an ex- plosion proof enclosure.
The Sierra Monitor Model 4400 provides the user with a low-cost, easy-to-use solution to effective monitoring of natural gas streams. This system accurately mea- sures H2S concentration in the 0-100 ppm range. Fast response of 90% of step change within 30 seconds enables the user to respond quickly to changes in natural gas supply conditions to prevent product contamina- tion.
There is minimal maintenance with the Model 4400 with no tapes to replace, no conditioning solutions, no me- chanical stream blenders to calibrate. Calibration is easy with external application of span gas and simple one person adjustments. Calibration and swapping of the gas sensor is a quick and simple operation per- formed every two weeks.
