Teledyne Analytical Instruments LXT-380, Instructions Manual

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LXT-380 Universal Transmitter Calibration
Teledyne Analytical Instruments
37
4.0 CALIBRATION
The Model LXT-380 transmitter provides three methods of
calibration:
1. Auto Calibration
2. Standardize Calibration
3. Manual Calibration
4.0.1 AUTO CALIBRATION DESCRIPTION
Auto calibration is the primary calibration method for all
measurements. AUTO calibration automatically recognizes the
calibration solution the sensor is in and proposes the actual temperature
compensated value for acceptance. AUTO calibration can be a single
point or two point calibration. A single point calibration sets the zero
point or offset value of the sensor. The second calibration sets the slope
or span of the sensor.
When the AUTO key is pressed the transmitter displays the PV
(Process Variable) and the associated mV signal from the sensor. When
the reading has stabilized a calibration value is
AUTOmatically proposed, i.e. 7.00 pH, 10 ppm
Fluoride ion, 0.00 mg/L Dissolved Oxygen.
The user is prompted to accept the proposed
calibration value or enter and accept another
value
. Once Cal 1 is accepted the user is ask to
continue to Cal 2, yes/no. If yes, then a second calibration value is
proposed when the sensor has stabilized in the second calibration
solution. Accept the value and the calibration is complete.
At the end of each calibration the Offset and Slope are displayed in
the respective units, pH, mV, ppm, mg/l.