reference junction

reference junction

reference junctionclick for a larger image
One of the two junctions in a thermocouple system—the one held at a constant or stable temperature to serve as a reference for measuring the junction.
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As shown in Figure 3 a mode scrambler was placed after the second reference region R2, and a third reference junction R3 was used to monitor the effect of mode scrambling.
* The ability to recognize standard thermocouple signals, with either internal or external reference junction compensation, and without the need for further adjustments.
Use an adequate volume of pH buffer to fully submerge the pH bulb and the reference junction, which is typically a small ceramic frit on the side of the probe.
The 2553A also offers RiC (reference junction compensation) at the output terminals, with a choice of three modes: internal, external and manual.
The other end of the thermocouple is joined within the temperature controller; this is referred to as the reference junction (Fig.
To counteract this, the chosen sensor features a non-clogging open reference junction and a solid polymer electrolyte that resist poisoning.
If a sensor dries out during storage, soaking it overnight in a pH 4 buffer will usually restore the hydrated glass layer and the reference junction.
Unlike thermocouples, RTDs need no reference junction, but they do require sensitive instrumentation optimized for low resistance measurements.
This was soldered to 30 AWG thermocouple wire (Omega) connecting the probe to a thermocouple reference junction. The heater and temperature sensor probes were filled with epoxy resin (West Systems, Bay City, ME) then the whole probe was assembled in a jig that held the needles parallel until the epoxy glue filling the probe body set.
Cold Junction (also Reference Junction) The junction in a thermocouple held at a stable, known temperature.
Built into the electrode's body is a sealed, gel-filled reference junction which encloses the electrode's pH-responsive flat glass surface.
The sealed gel-filled reference junction requires no maintenance and the epoxy body prevents breakage of the electrode, common with glass body models.