4.3 - Calibration
52
TCT-2301 Operating instructions
M2007/3en
©BTG 2004
Sampling procedure:
1. Install the sampling valve close to the transmitter. The valve should
be installed so there is no interference from pipe bends, pumps, etc.
Recommendations regarding turbulence damping zones are the same
as for the transmitter itself.
2. Take at least two, preferably three, laboratory samples. Calculate the
mean value; reject samples that deviate widely from the mean.
Take an adequate volume for sampling – at least 500 ml (1/2 US
quart) for a reliable sample.
3. Make sure that samples for calibration and subsequent checking are
always taken in the same manner
regardless of who does the sam-
pling. Similarly, the
laboratory procedure
must always be exactly
the same.
The design of, and compliance with, sampling routines is crucial in as-
suring uniform treatment of samples. Calibration and future precision of
measurement by the transmitter depend on this.
During calibration, the pulp flow past the Transmitter must be
represen-
tative
for the position in which it is installed.
To simplify and improve the regular follow-up routines, the BTG Smart
lab sampler - SLS-1000 is a useful aid.
4.3.3
Calibration procedure
Normal calibration is very simple, only one sample needs to be taken.
The functionality of the TCT-2301 means that a single point calibration
or even the preprogrammed curve is often fully adequate.
Since only one sample is taken, it is very important that it is correct.
Therefore, take out a large sample so that several consistency determina-
tions can be made at the lab, and an average value can be downloaded to
the transmitter.
!
It is important to read data to the SPC each time it is connected. It
is also important to continuously send all changes.
4.3.3.1
Summary
1. Collect values using the SPC at the same time as pulp samples are
taken from the line.
2. Evaluate the sample at the lab.
3. Enter the lab value in the SPC.
4. Calculate calibration constants.
5. Send the calibration values to the transmitter.
Tag: 25NT1237 Range x
---------------
0% 53.3% 100%
Cons. 1.30%
TCT-2301
4-20mA MODEMPRINTER
PWR
EJECT
ON/OFF
MEMORY CARD
SPC-1000
Communication Terminal
Read
data
Edit
Range
x
Confi-
gure
Cali-
brate
4 mA
1.00%
20 mA
3.00%
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