Det-Tronics U9500 Infiniti Gas Transmitter - Manual (Page 28)

95-8444 26 10.1
MANUAL CALIBRATION PROCEDURE
In the Manual Cal mode, the CAL/RESET switch must be
activated using the Cal magnet to accept a reading as a
calibration point. (The external reset input can also be
used to accept a reading if “YES EXT CAL” was selected
during the Setup procedure.)
The Infiniti must be programmed for manual calibration
prior to initiating the manual calibration procedure (refer
to the Setup section). Refer to Table 14 for the Manual
Calibration Procedure.
iMPOrTanT
The Manual Calibration Procedure must be used
for chlorine (Cl
2
) and sulfur dioxide (SO
2
) sensors.
Use the Auto Calibration Procedure for all other
sensors.
CALIBRATION PROCEDURE FOR INFINITI WITH
C7065E OxYGEN SENSOR
There are two calibration procedures for the U9500/
C7065E:
1. Initial/Replacement Sensor Calibration. This
procedure should be used on new product initial
calibration, or any time an existing sensor has
been replaced with a new or different sensor. This
procedure requires removal of the sensor housing.
Live DC circuits will be exposed to the surrounding
environment during this procedure.
2. Routine Calibration. This procedure should be
used for subsequent calibrations after the initial/
replacement sensor calibration procedure has been
performed. This procedure does not require removal
of the sensor housing, and no live circuits will be
exposed.
Before performing either procedure:
1. Ensure that the device is properly installed and
wired.
2. Ensure that the electrochemical cell is installed
properly.
3. Ensure that the U9500/C7065E is powered-up
and displays normal operating mode without fault
indication. In not, clear all faults before attempting
to enter calibration mode.
4. Ensure that the U9500/C7065E has been
programmed for “auto calibration” mode. Manual
calibration mode is not compatible with the C7065E
sensor.
5. For best results, allow the U9500/C7065E to warm
up for one hour before performing the calibration
procedure.
Initial/Replacement Sensor Calibration Procedure
1. Remove the C7065E aluminum sensor cover. Leave
the sensor cell plugged in.
2. Apply the calibration magnet to the U9500 calibration
target location for nine seconds, or until the U9500
display shows “zero-cal”.
3. Move the toggle switch on the electrochemical
sensor cell to the “zero” position. See Figure 19 for
switch location. This will simulate the “zero” or “no-
oxygen” condition necessary to establish a baseline
output calibration level. When the U9500 display
reads “00”, move the toggle switch back to the “on”
position. Place the aluminum sensor cover over the
cell and reinstall.
4. When the U9500 display shows “aply-gas”, the
transmitter will begin to record the sensor output level
in response to the ambient oxygen concentration.
If this is known to be 20.9%, an accurate span
calculation will result. If the ambient O
2
level is
less than 20.9%, it is recommended to apply 20.9%
oxygen using a Det-Tronics O
2
calibration kit.
5. When span calculations are complete, the U9500
display will indicate “cal-OK”, and then “rmv-gas”.
If using a Det-Tronics O
2
calibration kit, remove the
calibration cup and close the regulator valve. No
actions are necessary if ambient air O
2
is used.
6. The U9500 will automatically exit calibration mode
when calibration is complete. The displayed O
2
level
should be 20.9% (17.4 mA current level) if ambient
conditions are normal.
A1472
ZERO SWITCH
Figure 19—Electrochemical O
2
Sensor Cell