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Model LXT-230 Instruction Manual / 13
6.0 CALIBRATION
6.1 Manual Output Mode
To perform calibrations without interfering with control or recorder functions, the LXT-230
incorporates a manual output mode. The current output is set to the desired level and saved
until changed or released from the manual mode.
NOTE: Prior to any calibration the LXT-230 transmitter should be placed into the
manual mode.
Procedure:
1. If not at the Main Menu, press the appropriate MENU SELECTION key to reach the
Main Menu.
2. Press both horizontal CALIBRATE keys simultaneously to enter the calibrate mode
and observe the "M" appear in front of the % current output value; The current
output is now locked in the manual mode.
3. Using the horizontal CALIBRATE keys, position the cursor under the digit to be
adjusted.
4. Increase or decrease the value by pressing the appropriate vertical CALIBRATE key.
5. When the desired value is reached, exit the calibrate mode by pressing either MENU
SELECTION key. The current output will be held at the filed value.
To release manual output:
1. Return to the Main Menu by pressing the appropriate MENU SELECTION key.
2. Observe that the "M" appears in front of the % current output value. The "M"
signifies that the output is being held at the displayed value.
3. Press the left-hand CALIBRATE key and observe the "M" disappear, releasing the
LXT-230 from the manual output mode. The % output value will return to the real-
time current output.
6.2 Contrast Adjustment
Procedure:
1. Press the upper MENU SELECTION key to reach the Contrast Menu (upper most
menu).
2. Press both horizontal CALIBRATE keys simultaneously to enter the calibrate mode.
Observe the cursor move to the last digit.
3. Using the horizontal CALIBRATE keys, position the cursor under the digit to be
adjusted.
4. Increase or decrease the value by pressing the appropriate vertical CALIBRATE key.
5. To file the contrast value and exit the calibrate mode, press either MENU SELECTION
key.
6.3 One-Point Buffer Calibration (Standardize)
Because all pH and ORP electrodes experience minor variations, buffer calibrations are
necessary before installing the electrodes in service. Also, occasional calibrations are
necessary to compensate for electrode degradation while in service. For measurement
specifics, refer to the pH/ORP sensor manual.
pH 7.00
M24.3% 25.0°C
ORP -500.0 mV
M 55.0% 25.0°C