24
Model 4688-IR / 4679-IR
Operation & Maintenance Manual
Manual #087-0007G, 10/2003
Acknowledging Latched Alarms
Latched alarms may be reset only after conditions have returned to normal
(concentration is below the alarm reset point). To reset a latched alarm,
momentarily apply, then remove, the Scott Instruments magnet to any key.
Observe that the specific alarm indication has cleared from the main display.
Inhibiting Output
The
GasPlus-IR
transmitter's INHIBIT function prevents activation of alarm
relays in addition to holding loop output at the selected inhibit level.
NOTE:
Alarms are inhibited automatically at power on (for 30 seconds).
When
INHIBIT is toggled ON, it will automatically toggle OFF after 9 minutes. To
activate the inhibit function, place the magnet over the Z (Zero) key for 2
seconds, then remove. Observe the LCD displays
INHIBIT
. The inhibit mode
can be toggled OFF by again reapplying the magnet over the Z (Zero) key for 2
seconds, then removing. The period may be reprogrammed by changing the
value of the
AL.IP
parameter in the
USER
menu.
Zeroing the Transmitter
T
TT
TTo ensur
o ensur
o ensur
o ensur
o ensure the tr
e the tr
e the tr
e the tr
e the transmitter oper
ansmitter oper
ansmitter oper
ansmitter oper
ansmitter operates to specifications
ates to specifications
ates to specifications
ates to specifications
ates to specifications, power must
, power must
, power must
, power must
, power must
be applied to the tr
be applied to the tr
be applied to the tr
be applied to the tr
be applied to the transmitter for at least 20 minutes
ansmitter for at least 20 minutes
ansmitter for at least 20 minutes
ansmitter for at least 20 minutes
ansmitter for at least 20 minutes.....
Frequency
Frequency
Frequency
Frequency
Frequency
Slight changes in the GasPlus-IR 's sensor optics over time will affect its zero
point. For this reason, zero adjustment (described below) should be
performed periodically. Scott Instruments recommends zeroing the
instrument every 6 months. More frequent zeroing may be required in
extremely harsh environments containing high concentrations of ambient dust
or oil vapor. Zeroing intervals should be independently established through a
documented procedure which includes a zeroing log.
Span calibration is only required when the transmitter optics are
maintenanced. See "
" for instructions.
Maintenance, Troubleshooting, & Product
Support: Replacing the Emitter
Last Zero Date
Last Zero Date
Last Zero Date
Last Zero Date
Last Zero Date
The date of the transmitter's last zero was performed can be viewed by
accessing the SR.Zd parameter in the "User" menu.
Zero Adjustment
Zero Adjustment
Zero Adjustment
Zero Adjustment
Zero Adjustment
When performing zero adjustment on the Model 4688-IR (combustible
gas) transmitter, the transmitter’s zero may be set while the sensor is
exposed to air which is known to be free of hydrocarbons
(Scott
Instruments recommends the use of a portable zero air cylinder (P/N 077-
INHIBIT
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