YOKOGAWA EXA TB TB400G, User Manual

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<6. PROCEDURES FOR CONVERTER OPERATION>
6-14
IM 12E04A02-02E 9th Edition : Mar. 16, 2018-00
(b) Span calibration with standard solution
(Example of display)
(1) Select FUNCTION "4" in the <MAINT.> mode. => 0105.0 mg/L
(2) Wait until the display becomes stable, and => 0105.0 mg/L
then press the [ENT] key. The CAL lamp flashes.
(3) Press the [>] key. => 00000. mg/L
The display is now ready for
determination of the decimal point
position.
(4) Press the [>] key to determine the position => 000.00 mg/L
of the decimal point.
Every time the key is pressed, the decimal
point moves to the right and when the least
significant digit is reached, it moves to the
second digit from the left.
(5) Press the [ENT] key. => 0 0 00.0 mg/L
The second digit from the left flashes
and waits for the turbidity setting.
(6) Select a digit with the [>] key and set the => 0100. 0 mg/L
turbidity value of the standard solution using
the [^] or [v] key. Every time the [>] key is
pressed, the flashing digit moves to the right
and when the least significant digit is reached,
it moves to the second digit from the left.
(7) Press the [ENT] key to terminate calibration. => 0100.0 mg/L
The entire display flashes once and
the CAL lamp goes out.
If the turbidity value set in operation 7 exceeds the permissible setting range (0 to 2200 mg/L),
"not" is displayed. In this case, the "FAIL" lamp is not lit and a FAIL contact is not output. Reset
the error message by pressing the [ENT] key and continue operation from step 2.
Also, check the ratio of the current sensitivity (slope) to the reference sensitivity. If it exceeds the
permissible range (50 to 400%), "Err22" is displayed (see Section 5.3 *3).
The error message is reset by pressing the [ENT] key. Perform operation from step 2 again.
At any stage of zero-shift calibration operation, pressing the [MODE] key or [FUNC] key allows
switching to another mode or function. Calibration computation is not performed unless operation
7 is carried out.
Note: At this calibration, the turbidity not multiplied by the correction factor from the zero-shift calibration (zero correction) in (3) or span
calibration (sensitivity correction) in (5) is displayed.
(5) Span Calibration (sensitivity correction) (FUNCTION "5")
A part from the sensitivity based on the calibration plate (or standard solution), another corrective
sensitivity can be provided. For details on this function, see Section 5.3 (*3).
The sensitivity correction factor can be displayed and directly changed using FUNCTION "C" in
the <PROGRAM1> mode. Valve statuses in the operation of this function are the same as those
in the measurement status.
(Example of display)
(1) Select FUNCTION "5" in the <MAINT.> mode. => 0105.0 mg/L
(2) Wait until the display becomes stable, and => 0105.0 mg/L
then press the [ENT] key. The CAL lamp flashes.