Operating instructions

AMC-DTR Sensor Transmitter User Manual
19
Use the following step-by-step procedure to perform ZERO and SPAN calibrations.
1. To enter the CAL MODE from either data displays, press the DOWN / CAL key and
within 5 seconds press the EDIT key.
2. Using the appropriate calibration adapter, apply a clean ZERO gas or be sure there is no
background target gas in the monitored area. After the reading is stable, (approximately
1 minute) press the EDIT key to perform a ZERO calibration.
3. If the ZERO calibration is successful, press the NEXT key to proceed to the SPAN
check.
4. Apply the correct SPAN gas at .5 liters/min. After the reading is stable, (approximately
1 minute) press the EDIT key to perform a SPAN calibration.
WARNING:
The SPAN gas used must match the value specified since this is what the AMC-DTR will
indicate after a successful SPAN calibration. The Cal Span Value may be edited if it becomes
necessary to apply a different gas concentration (see Cal Span Value in section 7.3).
5. If the SPAN calibration is successful, the display flashes “REMOVE CAL GAS” and
starts the CAL PURGE delay.
6. CAL MODE will be complete after the end of the CAL PURGE delay.
The flow chart in Figure 17 illustrates the above procedure. UP, CAL, NEXT & EDIT labels
indicate keystrokes using the magnetic wand. The CAL MODE information screen (top of the
chart) is available for advanced users to see Offset / Gain calibration constants and live analog
to digital converter (A/D) counts. Span Gas calibration values may also be edited from this
screen. Holding the UP key, for 5 seconds during CAL MODE, displays this screen.
Calibration history records are logged and may be viewed in the Sensor Information menu (see
section 7.5).
R E MOV E
C A L GA S
NEXT KEY
R E P E A T C A L
S P A N F A I L
NEXT
S P A N C A L
S u c c e s s f u l
EDIT
l i v e r e a d i n g / e u n i t s
E D I T t o S e t Z E R O
N E X T = S P A N C A L M o d e
A p p l y Z V A L
E u n i t s
R E P E A T C A L
Z E R O F A I L
Z E R O C A L
S u c c e s s f u l
(If ZERO Cal OK)(If ZERO Cal Fails)
EDIT
(If SPAN Cal OK)(If SPAN Cal Fails)
E R R OR C OD E 4
show for 5 seconds show for 5 seconds
Hold UP key 5 sec. Hold UP key 5 sec.
O f f s e t = x x x x
G a i n = x x x x
C o u n t s = x x x x x x
l i v e r e a d i n g / E u n i t s
E D I T = S e t S p a n V a l u e
C a l S p a n V a l u e = x x x x x x
DATA DISPLAY
CAL, then EDIT
N E X T = R e t u r n t o C a l
l i v e r e a d i n g / e u n i t s
E D I T t o S e t Z E R O
N E X T = E X I T C A L M o d e
E u n i t s
A p p l y S V A L
S e n s o r L i f e
Back to DATA
DISPLAY
E R R OR C OD E 5
CAL MODE info screen
(use to change SPAN GAS value
and to see Offset / Gain constants)
Me a s u r e me n t N a me
% L E L
2
Me a s u r e me n t N a me
% L E L
0
P G A = x x x x %
Figure 17: Cal-Mode Flow Chart and Menus