FLUKE 9140-A-156 User Manual for the Fluke 9140-A-156 Dry Block Temperature Calibrator

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Using the same straight slot screwdriver, move the heater switch to dis

play “230V”. See the rear panel drawing in Figure 1 on page 13.

NOTE: If the heater switch and the fuse holder do not both read 230V when

complete, the unit will either not heat or only heat at a fraction of its capacity.

If not done properly, the unit could become damaged and void the calibration

and warranty.

CAUTION: DO NOT plug the unit into 230 V if the heater switch and fuse

holder read 115. This will cause the fuse to blow and may damage the in

strument.

6.4 Setting the Temperature

Section 7.2 explains in detail how to set the temperature set-point on the cali-

brator using the front panel keys. The procedure is summarized here.

(1) Press “SET” twice to access the set-point value.

(2) Press “UP” or “DOWN” to change the set-point value.

(3) Press “SET” to program in the new set-point.

(4) Press “EXIT” to return to the temperature display.

When the set-point temperature is changed the controller will switch the well

heater on or off to raise or lower the temperature. The cycle indicator, a two

color LED, will also indicate on (red and heating) or off (green and cooling).

The displayed well temperature will gradually change until it reaches the

set-point temperature. The well may require 5 to 20 minutes to reach the

set-point depending on the span. Another 5 to 10 minutes is required for the

temperature to stabilize.

6.5 Calibrating Probes

The dry-well block provides a constant temperature environment in which

probes may be compared. The probes inserted into the block may be compared

to the well temperature displayed on the front panel of the calibrator. The

probes should be inserted the full depth of the well since the temperature at the

bottom of the well will most closely agree with the displayed temperature.

For greater accuracy the probes may be compared to a reference thermometer

inserted into the block. The reference thermometer may be inserted into one

hole while the probes to be calibrated are inserted into another. The drawback

to this method is that because of temperature variations throughout the block

there may be a small temperature difference between one hole and another

which can cause errors.

9140 Dry-well Calibrator

User’s Guide

1.888.610.7664 sales@GlobalTestSupply.com

Fluke-Direct.com

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FLUKE 9140-A-156 Dry Block Temperature Calibrator