Teledyne 9060 - Zirconium oxide flue gas oxygen analyzer - Manual (Page 76)

9060-Zirconia Analyser
6.5 BACK-UP BATTERY REPLACEMENT
The back-up battery is contained within the battery-like real time clock/memory module,
plugged into socket M2. It is rated for an average service life of greater than ten years.
The module is not re-chargeable and should be replaced every three years in a stored
transmitter with power off or every eight years with transmitters that have had the power
on. The memory module must be purchased from Teledyne or an agent of Teledyne.
After replacing the battery, re-enter all set-up mode functions.
6.6 ELECTRONIC REPAIRS
Electronic schematics are included in Appendix 5. A competent electronic technician could
perform troubleshooting with these schematics, aided by the transmitter self-diagnostic
alarms. It is recommended that service be performed on a changeover circuit board basis.
A fast turn-around or replacement service is available from Teledyne or accredited service
agents. Other service aids, including a test EPROM firmware package and probe input
simulator are also available.
There are 3 fuses on the 1630-2 (terminal) PCB. FS1 and FS2 are M205 3Amp (or
3.15Amp) fast blow and are in the input power active and neutral lines. FS3 is a PCB
mounted 375mA fuse and is in series with the power transformer primary winding.
If any of these fuses are blown the transmitter display will be blank.
6.7 INSTALLING A NEW PROBE OR SENSOR
Whenever a new oxygen probe or sensor is installed, the millivolt offset value should be
entered. To achieve this refer to set-up 11 (and 12 for the second sensor).
The probe or sensor offset is noted on a tag or label attached to probe or sensor. To
check an offset on site, the probe or sensor must be sensing air with reference air
connected and allowed to settle at the 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. If a probe is in a process with the
process running, the air purge on the sensing side of the oxygen sensor will only be
successful if the probe has a filter or small sensing hole. Probes with open sensing ends
or with large sensing holes allow the process gas to mix with the calibration gas, giving a
false reading.
For heated probes or sensors, if the combustion appliance is not operational and the probe
or sensor heater is interlocked with the ‘FUEL ON’ signal, the ‘BURNER BYPASS’ switch
should be set to ‘BYPASS’ to power the probe or sensor heater after removing the probe
or sensor from the flue. For unheated probes, the sensing tip must be raised to at least
650°C (1200°F) with a portable furnace.
CAUTION DANGER
Return the ‘BURNER BYPASS’ switch to normal (off) before installing the probe or sensor
in the flue.