Teledyne 9060 Operating Instructions Manual page 56

9060-Zirconia Analyser
9060 manual. Enter the measured values in set-up items 7 to 10. Whenever new values
are entered the D/A Section should be re-calibrated, Refer to Section 6.3.
11. Set Probe or Sensor 1 Offset
See function 12
12. Set Probe or Sensor 2 Offset (When 2 sensors are selected in set-up 1)
A new EMF offset must be entered whenever a new oxygen probe or sensor is installed to
calibrate for any offset an individual probe or sensor may have. Each probe or sensor will
have an offset value noted on a removable tag. Enter the 'SENSOR OFFSET' value with
the same polarity,
eg. if offset value is -1.2 mV. enter -1.2 mV. The typical maximum is +/- 2mV.
To check a probe offset on site, the probe must be sensing air, with reference air, and
allowed to settle at the probe operating temperature for 30 minutes. Read the offset in
'RUN' mode in millivolts on the lower line. Offset errors can occur if the sensor does not
have some air passing over it. A gentle flow of air in the calibration check port can be
provided by a reference air pump or similar.
For heated probes, if the combustion appliance is not operational and the probe heater is
interlocked with the 'BURNER ON' signal, the 'BURNER BYPASS' switch should be set to
'ON to power the probe heater after removing the probe from the flue.
CAUTION DANGER
Return the 'BURNER BYPASS' switch to normal (off) before installing the probe in the flue.
For unheated probes, the probe sensing tip must be raised to at least 650°C (1200°F) with
a portable furnace.
Determine the probe offset in 'RUN' mode. Select 'Sensor EMF' on the lower line. With
probe in air, stabilised at temperature for 30 minutes, read the 'Sensor EMF'. Switch back
to 'set-up' mode and enter 'Sensor Offset' of equal value and the same polarity.
eg. If the measured 'SENSOR OFFSET' was -1.2 mV, enter -1.2 mV.
When reading the EMF offset, the flue pressure compensation must be set. If the probe
has been removed from the flue, set the flue pressure compensation set up to "Fixed" in
set-up 34, and the value to 0 in set-up step 38.
13. 4 to 20 mA Calibration Options, Channel #1
Select the calibration method for the 4-20mA output channel #1.
The output channels can be either calibrated by simply pressing the 'AUTO CAL' button, or
can be trimmed at both the 4mA and 20mA ends of the scale using an external multimeter.
Options:
1. Auto Calibration *
2. Manual Calibration
3. Set 4mA Trim
4. Set 20mA Trim