12
c.
Calibration
and
Testing
i.
Calibration
The
MS2700E
transmitter
is
fully
calibrated
when
shipped
from
the
factory.
The
calibration
settings
are
fixed
to
avoid
accidental
change
which
could
result
in
erroneous
data.
No
field
calibration
is
required.
However,
it
is
important
to
test
the
unit
upon
installation,
and
during
periodic
maintenance
inspections,
to
ensure
the
unit
is
operating
properly.
ii.
Testing
output
zero
and
span
The
MS2700E
transmitter
Probe
Selection
Switches
(page
9)
offer
three
test
settings
that
allow
the
unit
to
be
placed
into
various
diagnostic
modes
as
follows:
1)
Zero
Output
–
Forces
a
digital
output
of
0.
2)
Maximum
Output
–
Forces
a
digital
output
of
65535.
3)
Full
Scale
Sweep
–
Causes
the
output
to
continually
cycle
from
0
up
to
65535.
These
test
modes
can
be
useful
when
troubleshooting
communication
problems
between
the
transmitter
and
the
DCS/PLC
system.
iii.
Testing
the
MS2700E
transmitter
with
the
Meter
Prover
A
Meter
Prover
is
provided
to
allow
routine
checks
of
the
MS2700E
transmitter.
The
Meter
Prover
simulates
a
Wire
Loop
type
probe
at
a
fixed
value.
To
test
the
unit
with
the
Meter
Prover:
1)
Disconnect
power.
2)
Disconnect
the
MS2700E
transmitter
from
the
probe
(or
if
the
unit
is
remote
‐
mounted,
disconnect
the
probe
extension
cable
from
the
probe.)
3)
Connect
the
Meter
Prover
to
the
probe
connector
stem
(or
to
the
probe
extension
cable
if
the
MS2700E
transmitter
is
remote
‐
mounted.)
4)
Loosen
the
Enclosure
Lock
Screw.
5)
Unthread
and
remove
the
transmitter
cover.
6)
Change
the
Probe
Selection
Switches
to
the
Wire
Loop
position
(see
page
9.)
7)
Reconnect
power
and
allow
the
instrument
to
measure
for
several
minutes
to
stabilize.
8)
After
several
minutes
observe
the
transmitter
output.
The
output
should
closely
match
the
value
printed
on
the
Meter
Prover
label.
If
the
transmitter
output
matches
the
Meter
Prover
value,
you
may
return
the
Probe
Selection
Switches
to
their
previous
setting
and
reconnect
the
MS2700E
transmitter
to
the
probe.
If
the
transmitter
output
shows
a
significant
difference
compared
to
the
Meter
Prover
value,
further
troubleshooting
may
be
required.
Refer
to
page
16
for
troubleshooting
or
contact
the
factory
for
further
assistance.
Be
sure
to
reinstall
the
enclosure
cover
and
tighten
the
Lock
Screw
when
putting
the
MS2700E
transmitter
back
into
service.
