Excerpt from The Utility of the Pyrometer on Carburetted Water Gas Machines

Upon the introduction of pyrometry in the gas industry in Chi cago we found that there were three points to be considered in placing the instrument; first, the best position of the fire-ends in the machine; second, the most accessible position of the indicating instrument for the gas maker; and third, the most desirable po sition of the recording instrument for the superintendent. It was necessary to have two sets of fire-ends in each machine to control the temperatures properly, one in the carburetter and one in the superheater. The carburetter temperature was taken from the lower part of the carburetter while the superheater was taken from the top, which at that time was considered to be, and was, usually, the hottest part of the machine. The two indicator instru ments (one for the carburetter and one for the superhea'ter) were placed directly in front of the gas maker's stool and beside the guage board, as is illustrated in Plate No. 1, and connected to the fire-ends by copper leads 90 feet in length. The recorder instru ments for the various machines were placed along the wall in the superintendent's office, as illustrated in Plate No. 2, and connected in parallel with the indicator instrument to the fire-ends by copper leads 600 feet in length, which fact illustrates the adaptability of the thermoelectric pyrometer. By this arrangement the gas maker can watch the temperature rise or fall at all times without leaving his operating valves. He can therefore regulate his primary, sec ondary and superheater blast valves as conditions demand, instead of operating by a rule of thumb method. The superintendent by simply turning in his chair is in constant touch with the generator house. He can tell at a glance which machine is down for clean ing; how long each has taken to clean; how the cleaning time com pares with the record of previous days; What temperature is car ried by each machine in operation during the present run and for any previous run; which machines may not be in operation and how long they have been shut down; what temperatures were car ried during the night shift; and how long a machine has been down for repair work. The recording chart may prove of value in case of dispute as to the exact time an accident had happened on a machine and the length of time required to make repairs, es pecially if the occurrence was during the night shift.

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