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<5. FUNCTIONS>
5-9
IM 12E04A02-02E
9th Edition : Mar. 16, 2018-00
5.5 Functions Related to Contact Output
An on or off operation can be selected for every contact output.
The output AUX (C1, C2) is used for either upper and lower limit alarm output or automatic
cleaning and calibration output.
Table 5.7 Functions Related to Contact Output
Function
Description
Contact
Mode
FUNCTION
Selection of maintenance
contact output open or close
Open or closed (factory setting)
M1, M2
PROGRAM 2
C
Selection of FAIL contact output
open or close
Open (factory setting) or closed
F1, F2
PROGRAM 2
D
Selection of upper and lower
limit alarm output open or close
Open (factory setting) or closed
C1, C2
PROGRAM 2
E
Selection of automatic cleaning
or zero calibration output open
or close
Open or closed (factory setting)
C1, C2
PROGRAM 2
F
Selection of C1 and C2 outputs
Selection of upper and lower limit
alarm output or automatic cleaning
or calibration output
C1, C2
PROGRAM 2
E.
5.6 Other Functions
Table 5.8 shows other functions.
Table 5.8 Other Functions
Function
Description
Mode
FUNCTION
Converter check
It can be confirmed that the converter operates normally.
MAINT.
9
Setting of turbidity
signal average factor
Setting of the average factor of turbidity indication analog
output
PROGRAM 1
4
5.6.1 Overview of the Spike Detection Function
If air bubbles occur or dust is present on the sample surface of the detector's measuring cell at
which the light is scattered, the reading, in general, rises rapidly. The fluctuation is dependent on
the size of air bubbles or dust and their behavior on the sample surface.
A head tank is supplied when the TB400G with a sampling system is specified. It is for removing
air bubbles and thus for preventing them from reaching the detector. In rare cases, however,
air bubbles occur and grow in the pipe between the head tank and the detector, and rise to the
surface of the measuring cell, resulting in reading fluctuation.
The converter has a signal averaging function with a user-configurable averaging factor.
Small changes in readings due to air bubbles or dust can be compensated for, to some degree,
by increasing the averaging factor. However, it is not practical to set the averaging factor too high
because it can cause a delay in the response of the turbidity signal.
The spike detection function is the one of detecting and suppressing a rapid change due to air
bubbles or dust, preventing it from affecting the reading and output. (Note that this function is
available in models with ROM number K9410SE with version 1.04 or later).
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