YOKOGAWA EXA TB TB400G, Руководство пользователя

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<5. FUNCTIONS>
5-4
IM 12E04A02-02E 9th Edition : Mar. 16, 2018-00
5.2 Functions Related to Analog Output
5.2.1 Output Range Selection
The output range can be set up in three ways: auto range, remote range, and local range.
The relationship between these is as shown in Figure 5.1. Table 5.2 shows the setting modes and
function numbers related to the output range selection.
F0501.ai
Auto-range
Execution
Stop
Remote range
Execution
Stop
Operation
Auto-range
Remote range
Local range
Note: The turbidimeter is shipped with the output range set to 1 for the local range.
Figure 5.1 Output Range Selection
Table 5.2 Function Related to Output Range Selection
Detected item Details Mode FUNCTION
1 Output range 1
setting
The upper and lower limits for analog output 1 are set. PROGRAM 1 1.
2 Output range 2
setting
The upper and lower limits for analog output 2 are set. PROGRAM 1 2
3 Output range 3
setting
The upper and lower limits for analog output 3 are set.
PROGRAM 1
3
4 Auto-range
selection
The function that automatically switches the output ranges
(1, 2, and 3) depending on the turbidity value.
PROGRAM 1
1.
5 Remote range
selection
The function that switches the output ranges (1, 2, and 3)
by contact inputs (R1, R2, and R3) (when function 4) is
"oFF").
PROGRAM 1 2.
6 Local range
selection
The function that switches the output ranges (1, 2, and 3)
using converter key operations (when function 4) and 5)
are "oFF").
PROGRAM 1 3.
7 Auto-range
switching point
setting
The auto-range switching point is arbitrarily set when auto-
range is used.
PROGRAM 1 7
• Corresponding to switching of the output range, the range contact outputs (A1, A2, A3, A4) are switched and the RNG1, RNG2, or
RNG3 lamp is lit.
(1) Output range 1: Range contact outputs A1 and A2 are closed; RNG1 lamp is lit.
(2) Output range 2: Range contact outputs A1 and A3 are closed; RNG2 lamp is lit.
(3) Output range 3: Range contact outputs A1 and A4 are closed; RNG3 lamp is lit.
• When the output range is switched, digital range information is output only once (see Section 2.1, "Digital Communication
Specifications").
• When the turbidimeter is used with auto-range, the output should be set as shown below.
(1) Set the Low side of the setting to 0 (display is "L00.00").
(2) Set the High side of the setting so that range 1 <= range 2 <= range 3 holds.
(3) If two ranges are required, set range 2 = range 3.
(4) If one range is required, set range 1 = range 2 = range 3.
• Range switching timing in auto-range should be taken as follows:
(1) The timing of switching from a low range to a higher range is a point where the measured value just becomes larger than the
auto-range switching point of the lower range.
(2) The timing of switching from a higher range to a lower range is a point where the measured value just becomes smaller than
-10% of the auto-range switching point in the lower range (10% is provided for range switching hysteresis).
Note: Auto-range switching should be set in item 7. When the turbidimeter is shipped from the factory, this is set to 80% of the range.
• In auto-range, the output ranges are switched for contact inputs (R1, R2, and R3).
(1) No contact input: Output range 1
(2) Contact input (R1, R2) = Closed: Output range 2
(3) Contact inputs (R1, R3) = Closed: Output range 3