11
b.
Testing
the
Current
Loop
i.
Calibration
The
MS2901E
is
fully
calibrated
when
shipped
from
the
factory.
The
calibration
settings
are
fixed
to
avoid
accidental
change
which
could
result
in
erroneous
data.
In
general
no
field
calibration
is
required.
However,
it
is
important
to
test
the
MS2901E
upon
installation,
and
during
periodic
maintenance
inspections,
to
ensure
the
unit
is
operating
properly.
Follow
the
procedure
as
below,
if
calibration
becomes
absolute
necessary.
Note1:
Note
down
the
switch
settings
before
proceeding
to
the
below
procedure.
1)
4
.00
mA
Calibration
a.
Power
down
the
instrument
b.
Turn
Off
Switch
1
,2
and
3
c.
Turn
On
Switch
4
d.
Connect
meter
in
series
to
the
instrument
to
measure
current
in
mA.
e.
Power
‐
up
the
instrument
f.
Check
the
Loop
Current,
No
calibration
necessary
if
the
meter
reads
4.00
mA,
if
not
proceed
below.
g.
To
increase
the
loop
current
in
steps
of
0.025
mA
,
toggle
the
Switch
‐
2
to
Up
and
Down
.
Each
Toggle
will
increase
loop
current
by
0.025mA
h.
To
decrease
the
loop
current
in
steps
of
0.025
mA
,
toggle
the
Switch
‐
3
to
Up
and
Down
.
Each
Toggle
will
decrease
loop
current
by
0.025mA
i.
Ensure
current
reading
is
equal
to
4.00
mA.
j.
Turn
Off
Swithc
‐
4.
Wait
for
a
second
k.
Turn
off
the
Power.
2)
20
.00
mA
Calibration
a.
Power
down
the
instrument
b.
Turn
Off
Switch
2
and
3
c.
Turn
On
Switch
1
and
4
d.
Connect
meter
in
series
to
the
instrument
to
measure
current
in
mA.
e.
Power
‐
up
the
instrument
f.
Check
the
Loop
Current,
No
calibration
necessary
if
the
meter
reads
20.00
mA,
if
not
proceed
below.
g.
To
increase
the
loop
current
in
steps
of
0.025
mA
,
toggle
the
Switch
‐
2
to
Up
and
Down
.
Each
Toggle
will
increase
loop
current
by
0.025mA
h.
To
decrease
the
loop
current
in
steps
of
0.025
mA
,
toggle
the
Switch
‐
3
to
Up
and
Down
.
Each
Toggle
will
decrease
loop
current
by
0.025mA
i.
Ensure
current
reading
is
equal
to
20.00
mA.
j.
Turn
Off
Swithc
‐
4
and
wait
for
a
second
k.
Turn
off
the
Power.
Now
the
new
calibration
values
registered
in
the
non
‐
volatile
memory.
Note2:
Set
the
Switch
with
respect
to
probe
connected
to
the
instrument
before
put
into
service.
Summary of Contents for MS2901E
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Page 52: ...48 Appendix C Drawings A Wiring Diagrams Control Drawing Hazardous Area Wiring Diagram...
