Toshiba Density (Consistency) Meter LQ500, Operation Manual

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10.5.2 Density calculation
Following calculation modes can be selected.
(1) Additives correction ON (To be made) / OFF (Not to be made)
(a) Set value at shipping the density meter: OFF
(2) When additives correction is "ON"(to be made), you can select two calculation modes.
(b) Total density of mixture including the additives (TOTAL)
(c) Density of the main component only (MAIN)
In the mode (2) above, each of the density outputs (LED display of the converter, and the
current output in 4 to 20mA dc) can be either (b) or (c) separately.
* Set value at shipping: Both the density display and the density current output are in
"TOTAL" of (b) above.
(a) Density without additives correction
Following calculation is made (same density calc ulation as in section 9.1.3)
Xa = C
×
(a
×
Δ
θ
) +b
where, Xa : Measured density value
Δ
θ
: Phase difference that varies in proportion to the actual density
a : Density line slope
b : Density intercept (normally zero).
C : Density multiplier
(b) Additives correction to be made for getting Total Density of whole mixture including the
additives (TOTAL)
b ) (a C
R5 s5 R4 s4 R3 s3 R2 s2 R1 s1 s0
R5 R4 R3 R2 R1 1
Xb
+ × × ×
⋅ + ⋅ + ⋅ + ⋅ + ⋅ +
+ + + + +
=
Δθ
where, Xb : Density of the whole mixture
s0 : Sensitivity of the main component only
s1 : Sensitivity of additive #1, R1 : Mixture ratio of additive #1
s2 : Sensitivity of additive #2, R2 : Mixture ratio of additive #2
s3 : Sensitivity of additive #3, R3 : Mixture ratio of additive #3
s4 : Sensitivity of additive #4, R4 : Mixture ratio of additive #4
s5 : Sensitivity of additive #5, R5 : Mixture ratio of additive #5
Δ
θ
: Phase difference that varies in proportion to the diameter
a : Density line slope determined by diameter
b : Intercept of the line (normally zero).
C : Density multiplier
(c) Additives correction to be made for getting density of main component only (MAIN)
Xc
s s R s R s R s R s R
C a b
=
+ ⋅ + ⋅ + ⋅ + ⋅ + ⋅
× × × +
1
0 1 1 2 2 3 3 4 4 5 5
( )
∆ θ
where, Xc : Density of main component
Others are same as in (b)
(Note) When using the additives correction functions of (b) or (c), set the density multiplier C to
1.000. Following procedure is recommended for making span adjustment. At the
beginning of the use of correction, for a whole mixture of a formula, compare the