User Manual

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Functions  5

XP2i Operation Manual

Automatic Shut-o

The WT Series has a shuto timer and will turn o automatically after 20 minutes of non-operation. Pressing any button or sending any command via the RS-

232 connection resets the shuto timer for another 20 minutes of operation. The WT Series will brie y display Auto O 20 when turned on.

To disable the shut

o feature, turn on the WT Series by pressing the

(on/o ) and (zero) buttons si mul ta neous ly. The WT Series will brie y display the words

No Auto O to indicate that it will not turn o . T

he shuto feature can be enabled again when turning the WT Series on, by pressing the same (on/o ) and

(zero) buttons. These settings are retained when the product is powered down.

Note: This key combination will not toggle the auto-shuto f

eature if Con gXP is set to require a password before changing settings.

Backlight

Pressing the (backlight) button instantly lights the display at maximum brightness. Hold down the button for 1 second to keep it on. The display will  ash

brie y, indicating that it will stay on for 1 minute. If you press the

(backlight) button again, the backlight will go into a lower brightness setting to extend

battery life, and remain on for 2 minutes after the last key is pressed. Press the

(backlight) button once more and the light will go out.

If you start the WT Series in the No Auto O mode, you may select the brightness level in the same way. The light will never time out and turn o . Turn o the

WT Series, or press the

(backlight) button repeatedly, to turn o the backlight.

Measuring Vacuum

All versions of the WT Series can be used to measure mod er ate vac u um, though only ranges of 300 PSI (and 20 bar or 2000 kPa) and lower are actually tested

and certi ed for vacuum operation.

When mea sur ing pressure less than ambient baro met ric conditions, a mi nus (-) sign will appear.

Absolute gauges (models with a “B” in front of “WT” in the part number) will NOT

indicate a negative sign when vacuum is applied, unless the (zero) button

has been pressed while a pressure greater than full vacuum is applied to the gauge. If your absolute gauge does indicate a negative pressure, you can clear

the zero value (“unzero”) by pressing the

(zero) button until the display changes from (

) to (

CAUTION: WT Series are not recommended for continuous use below -14.5 PSIG.

For continuous use below -14.5 PSIG with high accuracy, choose our XP2i-DP Di er

ential Pressure Gauge.