The Isothermal Block - Fluke 9118A User Manual

9118A
Users Manual
 Caution
To prevent damage to the thermocouple, do
not over tighten the screw.
To prevent contamination of the thermocouple,
always wear clean gloves when you handle the
thermocouples.
5. Put the short probe into the ZONE TC tube on the rear
panel of the furnace.
6. Align the end surface of the thermocouple handle with
the front edge of the bracket. See Figures 13 and 12.
7. Tighten the bracket screw to hold the thermocouple in
position.
8. Connect the cable of the short probe to the ZONE TC
connector on the rear panel.

The Isothermal Block

The Isothermal Block consists of:
•
Front ceramic plug
•
Four ceramic guide tubes
•
Ceramic block
•
Rear ceramic plug
Items 1-3 are fixed together by high temperature cement.
The isothermal block is intended to stabilize temperature
fluctuations and improve heat conduction between the
furnace and the sensor under test. The "block" is made of
aluminum-oxide and provides a relatively constant and
20
accurate temperature environment for the sensor under
test. Four 6.7 mm diameter wells are provided.
To install the insert:
1. Carefully remove the isothermal block from the
packaging.
The well must be clear of any foreign objects such as
dirt or grit before the isothermal block is installed.
2. Carefully insert the isothermal block into the well from
the front of the furnace until the front plug contacts the
well.
3. Rotate the insert to the correct position, as shown in
Figure 14.
Right Position
Figure 14. Insert Alignment
4. Insert the rear plug into the well from the rear of the
furnace until it contacts the tube.
Wrong Position
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