Keller LEX 1 Bedienungsanleitung

LEX 1

Actual Value

Max.- / Min.-Value

ENTER

Max. / Min.

SELECT

G 1/4”

Highly Precise Digital Manometer

KELLER AG St. Gallerstrasse 119 CH-8404 Winterthur Tel. ++41 (0)52 235 25 25

KELLER GmbH Schwarzwaldstrasse 17 D-79798 Jestetten Tel. ++49 (0)7745 9214 0

www.keller-druck.com

LEX 1 has two operating keys. The left key (SELECT) serves to select

the functions and the pressure units. The right key (ENTER) activates

the selected function or pressure unit. The right key is also used to

switch between the Max.- and Min.-value.

Turn-on: Pressing the SELECT key turns the instrument on. The

instrument first displays the software version (year/week) and the full-

scale pressure range. The instrument is then ready for use and indi-

cates the actual pressure (top display) and the last measured Max.-

value (bottom display).

The instrument has the following functions:

RESET: Max.-/Min.-value are set to the actual pressure

OFF: Turns off the instrument

MANO: Releases the following functions:

ZERO SEt: Sets a new Zero reference

ZERO rES: Sets the Zero to factory setting

CONT on: Deactivates the automatic turn-off function

CONT off: Activates the automatic turn-off function (the instrument

turns off 15 minutes after the last key function)

followed by the unit selection: bar, mbar, hPa, kPa, MPa, PSI,

kp/cm2, cmH2O, mH2O, inH2O, ftH2O, mmHg, inHg

Example: Setting a new pressure unit (mbar):

--> Turn on the instrument by shortly pressing the SELECT-key.

--> Wait for the instrument’s measuring mode (approx. 3 seconds).

--> Press the SELECT-key 3 times: MANO appears.

--> Press ENTER: ZERO SEt appears.

--> Press SELECT: ZERO rES appears.

--> Press SELECT: CONT on or CONT off appears.

--> Press SELECT: bar appears.

--> Press SELECT: mbar appears.

--> Press ENTER: The new pressure unit (mbar) is set.

The instrument returns to the measuring mode.

Display of the minimum pressure value

When in the measuring mode (Display: Actual Pressure and Max.-

value), you may display the Min.-value for 5 seconds by shortly pres-

sing the ENTER-key.

Notes

• The functions and units can also be called up by keeping the

SELECT-key depressed. Releasing the key enables the displayed

function or unit to be activated with the ENTER-key.

• If the selected function or unit is not activated within 5 seconds

with the ENTER-key, LEX 1 returns to the measuring mode with-

out changing any settings.

• Turning LEX 1 on and off does not influence any of the previous

settings.

• If the CONT on function is activated, it is indicated with a flashing

sign (cont) on the display.

• If a pressure can not be represented on the display, OFL (over-

flow) or UFL (underflow) appears on the display.

• If the actual pressure goes beyond the measuring range, the last

valid pressure value starts flashing on the display.

Installation

Screw the G1/4 male port of LEX 1 into the female

pressure port and tighten using the lower

hexagon of the transducer. Loosen the

upper hexagon and rotate the LEX 1

to the desired position. Retighten.

The face of LEX 1 can be

rotated through 355°. This feature allows the LEX 1

to be mounted in all possible positions; vertical,

horizontal or upside down.

KELLER

Battery Change / Battery Life

When the battery starts weakening, a low battery warning will appear

(BAT LOW).

Battery change (turn off the instrument before changing the battery!):

Open the battery compartment and change the battery (type CR

2430). Make sure that the O-ring remains embedded in the cover.

The battery life is 2000 hours in normal measuring mode.

Ranges / Calibration

The factory setting of the Zero for the ranges ≤31 bar is at 0 bar abso-

lute. For sealed gauge pressure measurements, activate “ZERO SEt”

at ambient pressure. Instruments with ranges >31 bar are calibrated

in a sealed gauge mode at ambient pressure.

Interface (RS485)

The interface converter K103A (RS232) or K104A (USB) can be

connected at the back of the manometer, allowing the data transfer to

the PC. The corresponding software can be found on our web site.

01 / 2005www.keller-druck.com

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