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SMC sierra monitor corporation Sentry Instruction Manual - Version 6
CALIBRATION
Page: 48
5.2.2 CALIBRATION PARAMETERS
Use the CHANGE CALIB menu to configure calibration
parameters as follows: Calibration parameters remain in
Sentry memory until changed by the operator, they do not
require initiation at every calibration
Step Activity Display
1 Select CHANGE CALIB menu
PRESS ENTER TO
<CHANGE CALIB>
Use MODE key to select CHANGE CALIB
2 Select Gas Type
USE ARROWS/ENTER
GAS TYPE: COMB
Sentry displays the last gas type which was
calibrated. Use the arrow keys to change the type.
Press ENTER to continue to the next parameter
3 Edit Full Scale
USE ARROWS/ENTER
FULL SCALE = 100
If the full scale value is set above 999, the display
will default percent full scale (%FS). (Alarm
values must be set using PPM, not %FS.) Press
ENTER to continue to the next parameter.
4 Edit Span Gas Concentration
USE ARROWS/ENTER
CALIB CONC = 050
Use arrow keys to set the span gas concentration
to match the concentration of gas to which the
sensors will be exposed. Press ENTER to continue
to the next parameter
5 Edit Calibration Frequency
USE ARROW/ENTER
CAL FREQ =30 DAYS
Use the arrow keys to set the number of days till
the next calibration. Sentry will use this number
to count down to the next calibration and display
"CALIBRATION OVERDUE". Press ENTER to
continue to the next parameter.
The calibration overdue message is a notification
only and does not cause the module to go out of
service. The message can be suppressed by
setting the calibration frequency to "00" days at
the time of calibration
6 Select Calibration Method
USE ARROWS/ENTER
GLOBAL CAL ON
Use the arrow keys to turn Global Calibration ON
for Global Calibration or OFF for Local
Calibration.
5.3 CALIBRATION PROCEDURE
5.3.1 CONTROLLER SET-UP
Use the CALIB menu to initiate the calibration session at
the controller.
Step Activity Display
1 Select CALIBRATION activity
PRESS ENTER TO
<CHANGE CALIB>
From normal operate mode, press MODE and
ENTER to access the calibration activity.. (If a
user code has been set in the system it must be
input to access the CALIB/CHANGE activity.
See Section 8.3.3).
Successive Displays.
CALIB/CHANGE
SELECTED
Successive Displays
READ INSTRUCTION
MANUAL FIRST
Select Gas Type
ENTER TO CALIB
COMB 50% LEL
If the gas type is not correct press the ARROW
until the correct gas type and concentration is
displayed. Use CHANGE CALIB menu selection to
change span gas concentration. (See Section: 5.2 )
3A Initiate Calibration (Global)
ENTER TO ZERO
1 2 3 4 5 6 7 8
If the display is similar to this example, the
controll
er is configured for Global Calibration.
Continue to Section 5.3.1.1.
3B Initiate Calibration (Local)
APPLY 0 & 50% LEL
1 2 3 4 5 6 7 8
If the display is similar to this example, the
controller is configu
red for Local Calibration.
Continue to Section 5.3.1.2.
NOTE
In all calibration examples, the responses for
combustible gas are used as an example. Other gases
will provide appropriate similar displays.)