Endress+Hauser Liquiline M CM42, Руководство по функциональной безопасности

Страница: 14 / 72

Functional Safety Manual
for the Memosens transmitter Liquiline M CM42 SIL
Version: Page:
2.0 14 of 72
A
ll
e
R
ec
h
te
v
o
rb
eh
al
te
n
.
D
as
K
o
p
ie
re
n
d
ie
se
s
D
o
k
u
m
en
ts
u
n
d
d
ie
V
er
w
en
d
u
n
g
v
o
n
T
ei
le
n
au
s
d
ie
se
m
D
o
k
u
m
en
t
is
t
o
h
n
e
sc
h
ri
ft
li
ch
e
G
en
eh
m
ig
u
n
g
d
er
E
n
d
re
ss
+
H
au
se
r
C
o
n
d
u
ct
a
G
m
b
H
+
C
o
.
K
G
n
ic
h
t
er
la
u
b
t.
A
ll
ri
gh
ts
re
se
rv
ed
.
P
as
si
n
g
o
n
an
d
co
p
yi
n
g
o
f
th
is
d
o
cu
m
en
t,
u
se
an
d
co
m
m
u
n
ic
at
io
n
o
f
it
s
co
n
te
n
ts
n
o
t
p
er
m
it
te
d
w
it
h
o
u
t
w
ri
tt
en
au
th
o
ri
za
ti
o
n
fr
o
m
E
n
d
re
ss
+
H
au
se
r
C
o
n
d
u
ct
a
G
m
b
H
+
C
o
.
K
G
.
For Orbisint CPS11D (with KSG2-SIL head), the values are for example:
D
pH
/pH = 1.1% + 0.3% = 1.4% (for the temperature range 0°C/32°F to 60°C/140°F,
see safety manual of sensor). That means DpH is 0.2 pH for the temperature range
0°C/32°F to 60°C/140°F.
The complete detailed results are given in the table below about the complete
measuring chain.
The time for a measurement to be visible on the current output is in the worst case
scenario
5 seconds (for example a change from 4 mA to 20 mA and communication
problems, etc.).
This value is only valid for the transmitter. They do not include delays caused by the
cable (almost zero for Memosens cable) or sensor (about 1 second for Orbisint CPS11D,
see safety manual of sensor).
Hauser pH measuring chain
If you are using a Hauser pH measuring chain using the SIL Memosens CYK10
cable and the pH glass sensor Orbisint CPS11D (with KSG2-SIL head), the following
figures apply to the whole pH measuring chain:
The
time for a measurement to be visible on the current output is in the worst case
scenario <6 seconds, most of the time it is <2 seconds.
The precision depends on the temperature and the current output spreading (for the
values 0.3% and 4.0% used here, see the table and description in chapter 2.2):
Temperature
in Celsius
Temperature
in Fahrenheit
Precision
in pH
(= DpH)
Relative error
on current
output at a
spread of
1 pH
Relative
error on
current
output at a
spread of
14 pH
-20°C – 0°C -4°F – 32°F ±0.30 30%+4%=34% 2.2%+0.3%
0°C – 60°C 32°F – 140°F ±0.20 20%+4%=24% 1.5%+0.3%
60°C – 90°C 140°F – 194°F ±0.30 30%+4%=34% 2.2%+0.3%
90°C – 110°C 194°F – 230°F ±0.40 40%+4%=44% 2.9%+0.3%
110°C – 125°C 230°F – 257°F ±0.45 45%+4%=49% 3.3%+0.3%