Constant Temperature Block Assembly; Constant Temperature Block; Probe Sleeves And Tongs - Fluke 9150 User Manual

6.3 Constant Temperature Block Assembly

The constant temperature block assembly is shown in Figure 3 and consists of
removable inserts.
6.3.1

Constant Temperature Block

The "Block" is made of aluminum-oxide and provides a relatively constant and
accurate temperature environment for the sensor that is to be calibrated. A 1.25-
inch diameter well is provided that may be used for sensors of that size or may
be sleeved down with various sized multi-hole probe sleeves. Heaters sur- round
the block assembly and provide even heat to the sensor. A Type S thermocouple
is used to sense and control the temperature of the block. The entire assembly is
surrounded by a heat 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
insulator sleeve 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 fit snugly into the well whatever the diameter of the probe.
Insert A and an insulator is provided unless otherwise indicated. The inserts are:
•
•
•
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Figure 3. Removable Inserts
Insert A Model 3150-2 (variety block): 1/2", 1/4", 3/8", 3/16", 1/8", and 1/16"
holes
Insert B Model 3150-3 (comparison block): two each 3/8", 1/4", and 3/16"
holes
or
Insert C Model 3150-4 (1/4" comparison block): six 1/4" holes
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6-3