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Before beginning the calibration

procedure—which is a turnkey process but

takes at least 80 minutes to complete—you

must disable the APO function so the

instrument can remain on for more than

20 minutes.

To disable the APO function

power on the unit in a special way by

pressing and holding the

DEW

button while

pressing the button.

Following is the calibration procedure:

1. With the unit powered on and the APO

function disabled, rotate the sensor

protection cap to open its three vents

and expose the humidity sensor to the

environment.

2. Press and hold the

DEW

and

F/C

buttons

at the same time, and then release them.

This will cause

_ _ _ . 1

to appear on the

lower readout.

3. Turn the unit upside-down and insert the

sensor structure in the opening of the

33% salt bottle after removing the bottle’s

cap. The fit should be tight, with no air

leaking into the bottle.

4. Leave the unit upside-down in the 33%

salt bottle for at least 40 minutes. The

calibration to 33% is fully automatic and

requires no interaction or checking by

you.

General EP8709 User Manual

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