YOKOGAWA TB400G-A1 Series, User Manual, Page: 79 / 140

<6. PROCEDURES FOR CONVERTER OPERATION>
6-10
IM 12E04A02-02E
(5) Span calibration (sensitivity correction)
(6) Manual start of automatic cleaning
(7) Manual start of automatic calibration
(8) Reference sensitivity calibration
(9) Converter check operation
(10) Error code display
(11) Error resetting
(12) Reference lamp control value calibration
(13) Version number display
(14) Password entry to switch to the adjustment mode
(1) Zero Calibration (with "zero water") [FUNCTION "1"]
The zero-calibration operation using "zero water". For the value operating procedures, see
Section 7.6.
The following is a description of the key operations.
(Example of display)
1. Select FUNCTION "1" in the <MAINT.> mode. => 000.04 mg/l
2. Press the [ENT] key after the display becomes => The "CAL" lamp begins to fl ash.
stable.
3. Press the [>] key.
=> 000.00 mg/l is displayed.
4. Press the [ENT] key to terminate calibration. => 000.00 mg/l
The entire display fl ashes once and the "CAL" lamp goes out.
In addition, at operation 4, the measured signal at the zero point is checked and if the permissible
range (-10 to 10 mV) is exceeded, Err21 (zero calibration overrange) is displayed (see Section
5.3 *3). In this case, the "FAIL" lamp is not lit and a FAIL contact is not output.
An error message can be reset by pressing the [ENT] key and the display returns to the turbidity
indication. Wait until the display becomes stable and then begin from step 2 again.
At any stage of zero-calibration operation, pressing the [MODE] key or [FUNC] key allows
switching to another mode or function. Calibration computation is not performed unless the
operation of 4 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.
(2) Zero Calibration (with lamp turned off) (FUNCTION "2")
The zero-calibration operation is done by automatically turning off the lamp. Only in a measured
turbidity exceeding 200 mg/l, can zero calibration be performed simply in the following
operations. A turbidity reading with the lamp turned off reads a value 1 mg/l smaller than a
reading using "zero water".
(Example of display)
1. Select FUNCTION "2" in the <MAINT.> mode. => 002.00 mg/l
At this time, the lamp is still lit.
2. Press the [ENT] key. => 000.50 mg/l
The lamp goes out and the displayed value The CAL lamp fl ashes.
becomes smaller.
3rd Edition : May. 31, 2010-00