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meter. During recharging the red 'WAIT' lamp will be illuminated and welding is prevented before the
recharging is complete.
4.0 Specific applications.
4.1 Thermocouple junctions.
Thermocouple junction welds are the most common application for the SR80
and as such the instructions given under 3.4 should be followed.
In summary, the thermocouple wires should be prepared as stated in 3.3. The
prepared wires should then be gripped in the wire holding pliers, making sure that they are in contact
with each other and then with the weld switch (or footswitch) depressed, offered to the carbon
electrode. The resulting discharge will weld the wires thus forming the thermocouple junction. See fig
4.1
4.2 Impact welding.
This is the term used for welding wires to a metal (conductive) surface. This type of application is
common when thermocouples are required to be welded to a chassis or
framework for testing or heat treatment applications.
The optional welding clip attachment should be plugged into the 'COM' socket
on the front panel. The clip should then be attached to the surface close to
where the wires need to be attached.
The prepared wires are then gripped in the wire holding pliers and then pressed on
to the surface to which they are to be attached.
The weld switch (or footswitch) is then depressed and the resulting discharge will weld the wires to the
surface after which the weld clip can be removed. See fig.4.2.
4.3 Pt100 elements.
The SR80 can be used for attaching wires to Pt100 (or other types of sensing element) to manufacture
resistance thermometers.
Where possible, the element lead wires should be lightly twisted around the prepared extension in
reversed plane (see fig 4.3a) wires to ensure a good contact. These wires are then gripped in the wire
holding pliers. If the wires cannot be twisted (eg if using a muliticore cable) then hold in pliers in a 'V'
shape.
The weld switch (or footswitch) should be pressed and the wires offered to the carbon electrode in the
centre of the front panel, the resulting discharge will weld the wires.
Operating Instructions
Thermocouple
Junction Weld
Impact Weld
Temperature Technology Ltd.
Fig 4.1
Fig 4.2
5
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