Emerson ROSEMOUNT Xstream X2 Series User Manual

Emerson Process Management GmbH & Co. OHG 4-19
4
Maintenance
X-STREAM X2FD
Instruction Manual
HASXMDE-IM-EX
01/2015
4.4 Perform a Calibration
Calibration gases...
Tol.Check: Off
Hold on cal: On
Purge time: 15 s
Example:
Measuring range: 0 ... 50 %
Zero gas: 0 %
Span gas: 50 %
Situation:
Due to a fault zero gas is supplied to carry
out a span calibration, instead of span gas.
Tolerance check disabled (Off):
The analyzer calibrates the span with the
wrong gas resulting in an analyzer out of tune.
Tolerance check enabled (10%; AutoOff):
Starting a span calibration with zero gas
connected instead of span gas, the analyzer
gives an error message and stops calibrating
because the measured (expected span gas)
value differs more than 10 % from the upper
measuring range limit.
By default the option "Tol.Check" (tolerance
check) is disabled (Off).
So tolerance check helps avoiding calibrating
with a wrong gas applied (e.g. starting a span
calibration while zero gas is fl owing) resulting
in an instrument out of tune (see example to
the left side).
With tolerance check enabled (10%) during
calibration the analyzer checks that the en-
tered (setpoint) values for zero gas and span
gas are reasonable compared to the currently
fl owing calibration gas. If this gas concen-
tration differs more than 10 % of measuring
range from zero gas (during zero calibration)
or span gas setup (during span calibration),
calibration is aborted and a maintenance
request alarm is set ( LED and optional relay
output). Resetting the alarm requires to per-
form a valid calibration or to confi rm it within
the CONTROL - ACKNOWLEDGEMENTS..
screen.
The 3rd option (AutoOff) has the same func-
tionality as 10% except that the maintenance
request is reset after 2-3 minutes.
There are still situations when tolerance check
must be disabled, e.g. when calibrating after
changing the span gas concentration. In this
cases select Off.

P
ur
g
e t
i
me: 15
s
Note!
The last line ("purge time") shows up only
if the valve option is other than none (see
INSTALLED OPTIONS menu) and is used
for advanced, remote and unattended cali-
brations only..
Calibration gases...
Tol.Check: Off
Hold on cal: On
Purge time: 15 s

P
ur
g
e t
i
me: 15
s

Emerson ROSEMOUNT Xstream X2 Series Specifications

General

Brand	Emerson
Model	ROSEMOUNT Xstream X2 Series
Category	Measuring Instruments
Language	English