Valmet Valmet MCA, Installation & Owner'S Manual, Page: 55 / 66

Lab cal History
This menu shows a history of calibrations performed
on the device.
Move the cursor onto Lab cal History and press the
right arrow. The following display appears:
M C A : M C A - 1 2 3 4
2 3 - 0 4 - 0 5 1 0 : 3 2 : 0 9
L a b = 3 . 0 0 M C A = 3 . 1 0
C u m o f f s e t = 0 . 0 0 C s
T = 5 3 . 2 C A t t = 4 9 . 3 d B
A B O R T O K
The display shows the date and time of the calibra-
tion as well as the sample's measured value and
laboratory values. Press OK (F4) to browse through
the calibrations. Press ABORT (F3) to exit the menu.
Sample History
This menu shows the history of samples that have been
taken.
Move the cursor onto Sample History and press the
right arrow. The following display appears:
M C A : M C A - 1 2 3 4
1 0 : 3 2 : 0 9
M C A = 3 . 0 4 % C s
A t t = 4 9 . 3 d B T = 5 3 . 2 C
A B O R T O K
1 2 . 1 0 . 1 0
On the display you can read the date and time when
the sample was taken as well as the sample's measure-
ment values. Press OK (F4) to browse backward
through the samples. Press ABORT (F3) to exit the
menu.
Special functions
Special functions include chemical compensation,
temperature compensation correction curve, sensitivity
compensation and recipes.
Chemical Compensation
Large fluctuations in chemical content may cause errors
in Valmet MCA consistency measurements. These er-
rors can be compensated for with chemical compensa-
tion based on microwave damping measurement.
You must perform operations in two menus in order
to use chemical compensation.In Enter lab menu, first
select the chemical, and then enter the laboratory
conductivity for the sample you take. Note that the labo-
ratory conductivity is given in unites mS/cm.
If the conductivity meter shows results in units µmho/
in, divide the result by 2500, e.g. 25 000 µmho/ in = 10
mS/ cm. If the conductivity meter shows results in units
mS/ m, divide the result by 100, e.g. 550 mS/m = 5.5
mS/cm. If the conductivity meter shows results in units
µS/cm, divide the result by 1000, e.g. 5500 µS/cm =
5.5 mS/cm.
After entering these values, go to Special Functions
conductivity and select Chemical Compensation to
begin using chemical compensation. The following
display appears:
MCA: MCA-1234
Chemicals Comp
Chem. comp = OFF
Comp.value = 0.00 %
Chemical = NaOH
Lab.cond = 2.45 mS/cm
ABORT OK
To begin using chemical compensation, set the
Chem. Comp value from OFF to ON. Comp. Value
shows the chemical compensation value, which
chemical compensation subtracts from the consistency
results.
The lower two rows show the chemical and labora-
tory conductivity values entered in Enter lab menu.
Installation & Owner’s manual OUL00298 V2.3 EN 55 Valmet Mircowave Consistency Transmitter