YOKOGAWA DT450G Series, Руководство пользователя, Страница: 32 / 41

<4. Operation>
4-5
IM 11K01C01-01E
The set point of 20% means that the 4-20 mA output at the typical dust concentration will be 4 mA
+ (20 mA - 4 mA)

20% which makes 7.2 mA. If the dust concentration is five times the typical
value or higher, the output will be 20 mA, and if the dust concentration is zero, the output will be 4
mA.
Next, the measuring range should be set. Press the leftmost (A) key until the leftmost digit shows
“1.0”. Press the middle (B) key or the rightmost (C) key to increase or decrease the value until the
rightmost digit shows “0” (see Table 4-1). Last, press the leftmost (A) key until the display shows
“-SP.” Press the middle (B) or the rightmost (C) key to save the setting.
For Automatic Setup, make sure that the process is running with a normal dust concentration.
Then open the cover of the dust monitor. After move the parameters setting mode, initiate
Automatic Setup by pressing the small key button near the indicator lamp on the lower printed
circuit board (see Figure 4.1). Note: The indicator lamp should be green before you press the key.
Note: Initiate Automatic Setup in parameters setting mode.
Collecting data of the dust concentration will take an hour or less. The three digit display counts
down towards zero, and the indicator lamp is red as long as the data are being collected. To avoid
interference from the background electrical noise, you should close the cover of the enclosure
right after having initiated the Automatic Setup. After an hour, the setup is ready and the dust
monitor is in normal operation. The indicator turns back to green when setup is ready.
Note: The setting level is valid only when the automatic range setup (parameter “0” ) is used.
l
Fine adjustment for measuring range
Fine adjustment adjusts measuring range from 1-100%. Press the leftmost (A) key until the
leftmost digit shows “0.”, set the value from 1-100% .
• In case of setting 10%, the maximum range is 2 times higher than current range.
• In case of setting 50%, the maximum range is 0.4 times higher than current range.
• In case of setting 100%, the maximum range is 0.2 times higher than current range.
The following is relationship between the setting value and multiplication for measuring range.
(Multiplicationnnn for measuring range) =
20
(Setting value)
• Relay connection and parameter setting mode
(1) When both relays connected to NO
Relay 1 contact : Open Relay 2 contact : Close
(2) When relay 1 connected to NO and relay 2 connected to NC
Relay 1 contact : Open Relay 2 contact : Open
(3) When relay 1 connected to NC and relay 2 connected to NO
Relay 1 contact : Close Relay 2 contact : Close
(4) When both relays connected to NC
Relay 1 contact : Close Relay 2 contact : Open