4.3 - Calibration
M2007/3en
TCT-2301 Operating instructions
51
©BTG 2004
4.3 Calibration
This section assumes that you have completed section 4.2, and studied
the operation of the hand-held terminal as described in section 4.8.
4.3.1
General remarks on calibration
The transmitter should be calibrated for the specific application after it
has been installed in the line and all connections have been made.
The measuring principle used by this transmitter is insensitive to differ-
ent wood species and normally one calibration can be used with different
pulp/stock qualities.
The amount of filler can vary in different pulp/stock qualities and this can
affect the output signal. This can be handled by using different calibra-
tions (Measuring range).
4.3.1.1
Criteria for calibration
1. The transmitter is installed and has been started up.
2. A clear water adjustment must have been made as per section 4.2:
Clear water adjustment
.
3. The hand-held terminal must be connected to the electronics box and
switched on, and the transmitter data read into the terminal as per
section 4.1:
Starting the transmitter
.
4. The correct mode must be selected as per section 4.2.2:
Selecting the
correct ”mode”
.
5. The pulp must have representative consistency and flow values.
4.3.2
General remarks on sampling
Additional information can be found in
”
Accurate Consistency
— a
hand-book in consistency measurement in pulp and paper processing”
,
available from BTG.
To ensure acceptable precision in laboratory samples,
we recommend use
of BTG sampling valves.
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
Cali-
brate
The only way to calibrate the transmitter correctly
is to take
correct laboratory samples and adjust the transmitter
accordingly.
