4.4 - Other functions
56
TCT-2301 Operating instructions
M2007/3en
©BTG 2004
4.4 Other functions
4.4.1
Setting time constant (damping)
The time constant is set after calibration is complete. Set it so that the sig-
nal is stable, normally at 2 to 10 seconds.
If you find that you have to set a very long time constant because the
probe signal is unsteady, the transmitter is probably working in an unsta-
ble, poorly mixed pulp flow. In such a case you should consider:
•
relocating the transmitter further from the source of turbulence.
•
improving the remixing system or the supply of dilution water, etc.
If the time constant is too long, the high precision level of the transmitter
is reduced. Contact BTG for further advice.
Procedure:
1. Study the stability of the signal under MAIN MENU op-
tion
.
2. Go to MAIN MENU option
. Enter a suitable time con-
stant, e.g. 5 seconds. Press
,
.
3. Return to
and study the result.
4. If necessary, adjust the time constant.
Do not set a time constant
that is too long as this
reduces the accuracy of
the control system.
Trend
Damp
Xs
Send
data
Send
change
4-20mA MODEMPRINTER
PWR
EJECT
ON/OFF
MEMORY CARD
SPC-1000
Communication Terminal
Read
data
Edit
Range
1
Confi-
gure
Cali-
brate
4 mA
0.50%
20 mA
2.00%
Damp
1s
Offset
0.00%
Misc.
Note !
Trend
Calib-
ration
curve
Send
data
Tag: 25NT1237 Range 1
0% 53.3% 100%
Cons. 1.30%
TCT-2301
Damp
1s
Trend