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Model LXT-230 Instruction Manual / 21
APPENDIX A - SPECIFICATIONS
MEASUREMENT RANGE
pH: 0.00 to 14.00, fully expandable
and reversible, standard. -2.00 to
14.00 pH, optional.
ORP: +1000 to -1000 mV, fully
expandable and reversible,
standard.
OUTPUT 4-20 mA or 20-4 mA, linear
and expandable. Up to a maximum
of 3 outputs.
POWER REQUIREMENTS
(with zero loop impedance)
Recommended 24 vdc
Maximum 50 vdc
Minimum 13.5 vdc
MAXIMUM LOOP IMPEDANCE
(@ 24 vdc)
525 ohms for 4-20 mA compliance on
primary (channel 1) output;
approximately 800 ohms on secondary
outputs
OPERATING TEMPERATURE
-4°F to +158°F (-20°C to +70°C)
DISPLAY
Menu driven, 32 character alpha-numeric,
Supertwist LCD. The main menu
simultaneously displays (1) process
identity (2) process value (and
engineering units), (3) percent output, (4)
temperature in °C or °F.
ENCLOSURE
NEMA 4X, weatherproof
SHIPPING WEIGHT
Standard LXT-230: 2 lbs (0.91 kgs)
ACCURACY
± 0.10% of full scale
LINEARITY
± 0.05% of full scale
SENSITIVITY
± 1.0 mV
STABILITY
± 0.2% per year @ 0°C to 70°C
RESPONSE TIME
1 second to reach 90% of the change.
REPEATABILITY
± 1.0 mV
TEMPERATURE COMPENSATION
pH: Automatic, -30°C to +140°C, RTD.
Accuracy within ±0.1°C over a 0°C
- 100°C span.
Specific pH compensation temperature
correction) is available. Consult the
factory.
ORP: Not used for compensation;
however, temperature is displayed.
Accuracy within ±0.1°C over a
0°C-100°C span.
50/60 Hz NOISE REJECTION
Greater than 70 db
INPUT/OUTPUT ISOLATION
Maximum 300 volts between process input
and any 4-20 mA output (single
and multiple channel outputs). No
isolation between inputs on
multiple channel units.
CALIBRATION
Auto Buffer Calibration
Allows the definition of two buffer points,
saved in memory, during the initial
start-up. This will allow subsequent
standardize and span buffer
calibrations with only 2 keystrokes.
Back-to-Factory Calibration (Factory
Restart)
With 2 keystrokes, allows the technician
to return the transmitter to a zero
electrode offset (asymmetry
potential) and to an ideal Nernstian
slope (1.000 mV per ORP unit).