Teledyne 9060 - Zirconium oxide flue gas oxygen analyzer - Manual (Page 36)

9060-Zirconia Analyser
Reference Air Pump Fail
Reference Air Fail **
Mains Frequency Check fail
Probe Filter Blocked
Gas 1 Calibration Check Error
Gas 2 Calibration Check Error
Burner bypass Switch on
Oxygen Deviation High*
BB RAM Fail
Watchdog Timer
* These alarms are only available if two sensors are selected
** This alarm is only available if a flow sensor is installed in CN8 on the
1630-2 PCB
The watchdog timer is a special alarm. It will force the common alarm to activate in the
event of a microprocessor failure. There will not be an alarm message displayed, but the
transmitter will reset.
Alarms can be accepted by either pressing the alarm button (viewing the alarm
messages), or by temporarily closing a switch connected to terminals 16 & 17, REM
ALARM RESET.
Alarm relay 2 to 4 Select any one or all of the following for each relay. Refer 5 to
Section 5.5, steps 70 to 81
High oxygen
Low oxygen
Very low oxygen
Probe or sensor under temperature
Calibration check in progress
Probe purge in progress
Alarm horn function (Relay 4 only)
3.11 CONNECTING THE AUTOMATIC PURGE AND CALIBRATION CHECK
SYSTEM
CAUTION
The purge and calibration solenoid valves are supplied with mains voltage. This supply
has electrical shock danger to maintenance personnel. Always isolate the transmitter
before working with the purge and calibration solenoid valves.
The on-line auto purge and calibration check system is optional. For details on its
operation refer to Sections 1.3, 1.4, 2.9 and 2.10.
To automatically sense a blocked probe filter, a pressure sensor should be connected to
the ‘purge’ line to the probe ‘cal’ port. It should be adjusted so that it energises just above
the purge pressure with a new or clean filter installed. The switch contacts should be
connected to terminals 12 & 13 (PURGE FL SWITCH).
If the filter is still blocked or partly blocked after an auto purge cycle, the pressure switch
will energise and cause a ‘Probe Filter Blocked’ alarm.
After installation the purge/cal system should be tested thoroughly for leaks. Any leaks
can cause significant errors if the flue is at negative pressure. If the flue is at positive
pressure, an outward leak can cause corrosion in the purge/cal system piping and fittings.