Det-Tronics U9500 Infiniti Gas Transmitter - Manual (Page 27)

95-8444 25 10.1
Table 13—Automatic Calibration Procedure
Description Display Operator Action
Normal operation/no gas present Indicates the detected gas
concentration
• If the possibility of background gases exists,
purge the sensor with clean air to ensure accurate
calibration.
Initiate calibration – Catalytic,
PIR9400 & all toxic sensors
Sequences through the Setup
settings
Enters the Calibration mode
-
Display shows detected gas
concentration and alternating
message:
“ZERO” “CAL”
• Hold the Cal magnet to the CAL/RESET magnetic
switch for 7 seconds. See Figure 18 for CAL/RESET
switch location. (The external reset input can also be
used to enter the calibration mode if “YES EXT CAL”
was selected during Setup procedure).
New sensor cal – O
2
New O
2
sensor cal – First remove C7065E cover and
select “Zero”.
Existing sensor cal – O
2
No zero gas action necessary.
Zero calibration complete
Display shows detected gas
concentration and alternating
message:
“APLY”
“GAS”
• Apply the calibration gas to the sensor by placing
the calibration cup over the sensor (or installing
the direct inject fitting and hose on the PointWatch
detector) and opening the valve on the calibration
gas cylinder.
New sensor cal – O
2
Select switch to “ON”. Replace C7065E cover.
Span calibration
Display shows rising gas
concentration and alternating
message:
“GAS”
“ON”
• None.
Span calibration complete
Display shows decreasing gas
concentration when gas is removed
and alternating message:
“CAL” “OK”
then
“RMV”
“GAS”
then, if the calibration is successful:
“XXXX SPAN”
• Remove the calibration gas. When the gas level
falls below the lowest alarm setpoint, and if no faults
are present, the transmitter automatically exits the
Calibrate mode.
• A sensitivity reading that can be used to track
sensor life (except PointWatch) is displayed for
seven seconds with the “SPAN” reading and prior
to the transmitter returning to normal operation. Any
reading over 100 indicates that the sensor is good.
• At the successful completion of the calibration, all
outputs and indicators return to normal operation.
• If faults are present, the unit will exit after the
remainder of 10 minutes.
Calibration fault indication
Display shows alternating messages
indicating the fault, then
“RMV”
“GAS”
• If a fault occurs, remove the gas and correct the fault.
After the fault has been cleared, begin calibration
again. See Table 15 - Fault Messages, Explanations
and Corrective Action.