REFLOW TRACKER Basic Hardware 15
Barriers for Q18 Micro Logger, DQ1804
TB2098 – Reflow soldering processes
Duration 10 mins at 200°C.
Dimensions Height
Width
Length
Weight
27 mm
57 mm
190 mm
0.4 kg
1.1 in.
2.2 in.
7.5 in.
0.9 lb
TB3006 – Long-duration reflow soldering processes
Duration 14 mins at 200°C.
Dimensions Height
Width
Length
Weight
32 mm
71 mm
194 mm
0.6 kg
1.3 in.
2.8 in.
7.6 in.
1.3 lb
Thermocouple Probes
Thermocouple probes utilize an effect by which an e.m.f. is produced in any
electrically conducting material that is not at uniform temperature. The actual
voltage measured is proportional to the temperature difference between the
thermocouple’s ‘hot’ and ‘cold’ junctions (the hot junction being the
measurement junction, and the cold junction being the junction of thermocouple
and measurement instrumentation).
The practical implementation of thermocouples requires sophisticated
electronics to eliminate potential measurement errors which include poor
linearity over the measurement range, and inaccuracy due to temperature
variations at the cold junction. To accommodate these the electronics in the
measuring system must simulate a temperature of 0°C at the cold junction, as
well as compensating for any non-linearity over the range of thermocouple
operation.
Over the years, ‘standard’ thermocouples have been developed using materials
chosen for sensitivity, linearity (consistency of sensitivity over the useful
temperature range), price and availability. Current standards include types K, N,
R, S and T, each type being identified by its connector color. The standard
thermocouple probe for reflow industry use is type K.
All Reflow Tracker systems are supplied with one set of PTFE-insulated
thermocouple probes (part no. PA0210). Other probes available are:
• High-temperature glass-fiber-insulated (PA0215).
• Fine-wire, for use on ball grid arrays (BGAs) (PA1683).
• Special probes for wave-solder pallet (p. 31).
• Surveyor sensors. See p. 46.
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