YOKOGAWA DT450G Series, User Manual, Page: 30 / 41

<4. Operation>
4-3
IM 11K01C01-01E
4.2.4 Setting of Parameters
The dust monitor has a 4-20 mA output and two relay contact alarm outputs. The effect of sudden
change of measured value can be removed by setting a user configurable time constant.
The output current of the 4-20 mA signal can be trimmed.
The relay output (s) change their state when the measured dust concentration exceeds a user
selected alarm trigger level. The relay output (s) are also protected against the effect of sudden
change of input signal, with a user configurable time constant, common for both relays.
All the user selectable parameters have factory default values, which in many cases will suffice.
If your application requires changing parameters, proceed as follows.
How to Change Parameters
Open the cover of the dust monitor. You see a front panel, a display unit and three parameter
buttons (A, B and C).
It is needed to enter PIN code before setting parameters.
1. Press (A) key and select first PIN code digit 0 to 9.
2. Press (B) key and select second PIN code digit 0 to 9.
3. Press (C) key and select third PIN code digit 0 to 9.
Factory default for PIN code is 1.1.1.
Parameters can be changed after the right PIN code is selected and simutaneously press and
hold down (B) and (C) key for one second. (Parameter setting mode)
Press the leftmost (A) key of the three keys below the display, until the leftmost digit indicates
the number of the parameter you wish to change (refer to Table 4-1). The two other display digits
now show the parameter value. Pressing the middle (B) key and rightmost (C) key, you may now
change the parameter value. See instructions below for each individual parameter.
When you have set all the parameters, press the leftmost (A) key again until the display shows
“-SP.” Press one of the other keys (B or C) to save all the parameters.
NOTE: All parameters must be as you wish to have them, when you save them. If you want to make more changes, or decide not to
save the parameter you have changed, press the left most (A) key again.
Table 4.1 Parameter Change Table
Parameter
Display Left
Number
Range Key Effect Key B Key Effect Key C
Factory
Default
Alarm contact (relay 1) 1 1 to 99% Increase number by 10% Increase number by 1% 5%
Alarm contact (relay 2) 2 1 to 99% Increase number by 10% Increase number by 1% 60%
4 mA trim 3 Increase number Decrease number Set to 4 mA
20 mA trim 4 Increase number Decrease number Set to 20
mA
Alarm contact
time constant
5
10 to
180 s
Increase number by 10 s Decrease number 10 s
Analog output signal
time constant
6
10 to
300 s
Increase number by 10 s Decrease number by
10 s
10 s
Percent level of full
range
7
10 to
50%
Increase number by 10% Decrease number by
10 %
20%
8
Not available
9
Fine adjustment for
measuring range
0.
1 to
100%
Increase number Decrease number 20
10.*
Not available
Pin code 1.
Set measuring range 1.0* 0 to 5 Increase number Decrease number 0
Save parameters -SP* Save all Save all −
*1.0, 10., in 2 digits -sp in 3 digits
Do not set parameters except “0” for the leftmost digit “8”, “9” and “10.”.