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Model LXT-230 Instruction Manual / 4
UNPACKING THE INSTRUMENT
Your Teledyne instrument has been carefully packaged to protect it from damage during
shipment and dry storage. Upon receipt please follow the procedure outlined below.
1. Before unpacking, inspect the condition of the shipping container to verify proper
handling by the carrier. If damage is noted, save the shipping container as proof of
mishandling for the carrier.
2. Check the contents of the shipping container with the items and quantities shown on the
packing list. Immediately report any discrepancies to TAI.
3. Save the original packing material until you are satisfied with the contents. In the event
the transmitter must be returned to TAI, the packing material will allow you to properly ship
it to TAI.
4. Familiarize yourself with the instrument before installation, and follow proper installation
and wiring procedures.
1.0 GENERAL DESCRIPTION
Teledyne's Model LXT-230 is a microprocessor-based two-wire transmitter for process
control of pH, ORP and Specific Ion. Incorporating microprocessor technology, the LXT-230
provides the following features:
1.1 Membrane Switches
Calibrations can be performed via membrane switches located on the front cover, removing
the need to open the NEMA 4X enclosure and exposing components to the environment. No
potentiometric adjustments are required.
1.2 Digital Display
A 32-character Supertwist alphanumeric liquid crystal display (LCD) is used to display data
menus. The two rows of 16 characters can be adjusted to different contrast intensities for
easy viewing.
1.3 Automatic Buffer Calibration
Allows buffer points to be defined upon initialization of the transmitter so that no
adjustments are required for future buffer calibrations.
1.4 Back To Factory Calibration
Allows the transmitter to be returned to a predetermined factory calibration. The default
parameters are zero electrode offset at 7.00pH or 0.00mV ORP and the ideal Nernstian
slope for the appropriate measurement.
1.5 Current Output
A standard LXT-230 transmitter is provided with a 4-20 mA current output transmitted on
the same 24-vdc power wiring. The current output may be expanded to any range within
the transmitter's full operating range (see specifications). For customer controllers that are
not capable of reverse acting control, the LXT-230 allows the current output to be reversed;
for example, a 4-20 mA output for a range of 0-14 pH can be reversed to 14-0 pH.
1.6 Temperature Conversion
This standard feature allows the temperature displays to be presented in Celsius or