Ģ) Have an SSi calibration engineer visit your site to perform the TUS for you. There are two ways to go about TUS with Super Systems Europe:ġ) Order an SSi SDS datalogger with SDS reporter and training by an qualified SSi Calibration Engineer. Our engineers will often tune burners and analyse the furnace atmosphere with a PGA3510 (if it is safe to gas up the furnace) during the TUS. 10☌), but with a poor uniformity, due often to a poorly positioned control thermocouple.Ī TUS can take a furnace out of service for a considerable amount of time, so it is worth maximising that downtime by performing other tests during the TUS. It is common to survey a furnace with a good spread (e.g. Note that ‘uniformity’ is generally understood to mean the total deviation around the set point, versus ‘spread’ which has no relation to the set point. Put simply, a Temperature Uniformity Survey (TUS) ensures that components see the same temperature regardless of where they are in the furnace.ĪMS 2750e requires heat treaters to classify their furnaces between +/- 3☌ (class 1) and +/- 28☌ (class 6), whereas CQI-9 (table A) requires heat treaters to meet a (quite generous) uniformity of +/- 15☌. Install nitrogen purge components, beginning with the breather valve and emergency vent IV. Temperature Uniformity Surveys (TUS) with Super Systems Europe is an ISO:9001 and ISO:14001 registered company. The permanently mounted low range dew point analyser (DPC3500) does not require this feature since it is typically mounted in the gas stream and is constantly surrounded by dry gas.įor pure gases, the dew point measurement can provide information regarding the purity of the gas, with a lower dew point indicating higher purity levels. For this reason, the sensor in Super Systems’ portable low range dew point analyser (DPL4000) has a self-heating tip to reduce the measurement time to a few minutes instead of a few hours. Since ambient dew point levels will quickly saturate a sensor that is designed to measure only trace amounts of moisture, it can sometimes take a long time for a low range dew point sensor to dry out enough to provide an accurate reading. With gases this dry, moisture levels require a more direct measurement. This is because the dew points are so low (typically from -20☏ to -120☏, or -28.9☌ to -84.4☌) that even the slightest error in relative humidity measurement can have a significant impact on the calculated dew point. Measuring the dew points of pure gases such as nitrogen, argon, and hydrogen cannot be done using a calculation based on relative humidity and temperature.
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