Teledyne Analytical Instruments LXT-380, Instructions Manual

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LXT-380 Universal Transmitter Operation
Teledyne Analytical Instruments
21
Double tap any Selection/Adjustment key to enter the HOME
Menu Screen. Five menu choices will appear, CAL, CONFIG, INFO,
SIM and HOLD . Each of the Menus is detailed below.
3.2.1 HOLD (OUTPUT HOLD)
Actuating the HOLD Key activates the HOLD function, HOLD is
ON, displayed.
•
Freezes the 4-20 mA output at the last
value prior to activation
•
Freezes optional Alarm Relays in the
current state
•
While in the HOLD mode the % Output
display toggles between the last value and
HOLD
Actuating HOLD again turns the hold function off, Hold is OFF,
displayed. The HOLD function remains ON until it is turned OFF. (See
Time Out in CONFIG>XMTR>OUTPUT>HOLD).
3.2.2 CAL (CALIBRATION MENU)
Four options are available, AUTO, STAND, MANUAL and
TEMP. On dual channel instruments choose Sensor 1 or Sensor 2 when
prompted.
The first screen asks, “ Is this a New Sensor,
YES / NO ”. If YES the calibration history from
the previous sensor is cleared from memory and a
new register is started, if NO then the calibration
is written to the memory stack, three sets of data
are stored.
•
AUTO is a two point calibration. The calibration proceeds in
two steps, Auto Cal 1 is an offset calibration and Auto Cal 2 is a
slope calibration. Auto Cal provides automatic solution
recognition of the calibration solutions used for each
measurement in accordance with the following list:
1. pH Calibration Buffers (US Standard), pH 4.01, pH 7.00
and pH 10.00 (see Appendix A).