Fluke 1551A Ex User Manual page 8

1551A/1552A Ex
Users Manual
Probe sensor length is shown in Figure 1.
Sheath Length:
1551A-9: 229 mm (9 in)

1551A-20: 508 mm (20 in)
1551A-12/1552A-12: 305 mm (12 in)
Sensor Length:
 1551A: ≤10 mm (0.39 in)
1552A: ≤30 mm (1.18 in)
Sheath Diameter:
 1551A-9: 4.8 mm (3/16 in)
1551A-12/1551A-20/1552A: 6.35 mm (1/4 in)
Wet (liquid bath, thermowell with thermal
compound)
Dry (dry-well, thermowell without thermal
compound)
•
•
See Figure 2.
4
Figure 1. Probe Measurements
•
The minimum required immersion depth depends on the type of medium (wet or
dry) as shown in Table 1. These figures should result in immersion errors of
<0.005 °C in most cases. Actual results depend on the type and form of the
surrounding materials.
Table 1. Minimum Immersion Depth
Medium
The maximum immersion depth for the 1551A Ex is 50 mm (2 in) less than the total
length. Make sure the last 50 mm of Probe, nearest to the internal electronics of the
device, are not put into the heat source.
The maximum immersion depth for the 1552A Ex is 75 mm (3 in) less than the total
length. Make sure the last 75 mm of the Probe, nearest to the internal electronics of
the device, are not put into the heat source.
Minimum Immersion Depth
70 mm (2.8 in.)
120 mm (4.8 in.)
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