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...APPENDIX C
C1.6 Maintenance
1
4
8
7
5
3
6
2
Fig. C7 Model 7997 100
C1.7 Spares
I
e t
m
D
e
s
c
D
y r
C
a
b i l
a r
o i t
n
S
a t
n
d
a
d r
w
h
c i
h
n i
c
u l
d
e
: s
1
C
o
n
a t
n i
r e
D
y r
C
a
b i l
a r
o i t
n
S
a t
n
S
i l i
a c
G
e
( l
m
y a
b
e
o
2
E
m
t t i
r e
A
s
e s
m
b
y l
0 (
o t
3
R
e
e c
v i
r e
A
s
e s
m
b
y l
0 (
o t
'O'
R
n i
g
S
p
r a
s e
K
t i
w
h
c i
4
'O'
R
n i
g
5
'O'
R
n i
g
6
'O'
R
n i
g
1
7
B
l l a
V
l a
e v
/
n i .
B
S
P
2
1
8
C
o
n
n
e
t c
r o
/
n i .
B
S
P
T
2
1
9
B
l l a
V
l a
e v
/
n i .
B
S
P
4
1
1
0
C
o
n
n
e
t c
r o
/
n i .
B
S
P
T
4
Table C1 Model 7997 100 Spare Parts
46
8
7
9
i r
t p
o i
n
P
a
A
s
e s
m
b
y l
7
9
9
d
a
d r
d r
e
e r
d
e s
p
a
a r
e t
) y l
0
2
1
5
N
T
) U
7
9
9
5
N
T
) U
7
9
9
h
n i
c
u l
d
s e
e t I
m
s
4
5 ,
&
6
7
9
9
0
2
1
0
2
1
0
2
1
0
2
1
0
2
1
0
2
1
0
2
1
Sensor Cleaning
The Model 7997/100 sensor unit is generally used on clean
water samples and maintenance should be limited mainly to
manual monthly cleaning of the flow chamber, under normal
conditions. If there is a high turbidity breakthrough, clean the
chamber immediately to ensure accurate readings.
Calibration
Calibration can be carried out using either a Dry Calibration
Standard or Formazine Solution.
C1.8 Specification
Range: ................. Programmable between 0 to 1 NTU and
Principle: .............. Nephelometric.
Resolution: ........... 0.1 NTU.
Repeatability: ........ Better than 1% of span.
Accuracy: ............. 2% of FSD @ 25C
10
Temperature drift: . 0.005 NTU/10C.
Response time: .... Varies with flow rate, typically 90% step
Flow Rate: ............ 0.5 to 1.5 l min
t r
N
. o
Sample operating
7
0
5
0
temperature: ......... 0 to 50C.
Sample pressure: . Up to 3 bar.
7
4
6
4
7
0
5
2
7
0
5
1
7
0
1
0
1
3
2
1
1
3
1
7
1
3
1
9
6
5
0
9
6
5
1
0
6
5
0
8
6
5
1
5
0 to 30 NTU.
(limited by uncertainty in formazine
standards).
change in less than 45 seconds at
–1
1 l min
.
–1
.
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