EXIT – Used to exitfrom a menu. When EXIT is pressed any changes made to
the displayedvalue are ignored.
6.3 Constant Temperature Block Assembly
The constant temperature block assembly is shown in Figure 3 and consists of
removableinserts.

6.3.1 Constant Temperature Block

The “Block”is made of aluminum-oxide and provides a relatively constant and
accurate temperature environmentfor the sensor that is to be calibrated. A
1.25-inch diameterwell is provided that may be used for sensors of that size or
may be sleeveddown with various sized multi-hole probe sleeves. Heaters sur-
round the block assemblyand provide even heat to the sensor. A Type S ther-
mocoupleis used to sense and controlthe temperature of the block. The entire
assembly issurrounded b y aheat reflector to thermally isolate the chassis and
electronics.

6.3.2 Probe Sleeves and Tongs

The calibrator is supplied with a multi-hole aluminum-oxide probe sleeve and
insulatorsleeve for insertion into the calibrator well and tongs for removing
sleeves.Probe sleeves of various hole sizes are available to allow the user’s
probe to fitsnugly into the well whatever the diameter of the probe.
Insert A andan insulator is provided unless otherwise indicated . The inserts
are:
17
6 Parts and Controls
Constant Temperature Block Assembly
Figure3 Removable Inserts