Important Notices; Cautions - Novatech 1732 Technical Manual

1. I N
MPORTANT OTICES
This manual is a complete version of the 1732 Dual Probe Oxygen Transmitter product manual. It is
intended to be used by technical personal that are qualified to install, commission, service and calibrate
electronic industrial control equipment. A separate Operators Manual is also supplied with the transmitter
intended to be used as a reference for basic operation once the device is commissioned. Both manuals are
supplied with each transmitter and are also available to download at the Novatech Controls website.
https://www.novatech.com.au/products/1732/
Please read the safety information below before connecting power to the transmitter.

1.1 Cautions

CAUTION 1
The probe heater is supplied with mains voltage. This supply has electrical shock danger to maintenance
personnel. Always isolate the transmitter before working with the probe.
The EARTH wires (green/yellow) from a heated probe must ALWAYS be connected to earth.
CAUTION 2
Combustion or atmosphere control systems can be dangerous. Burners must be mechanically set up so that
in the case of equipment failure, the system cannot generate explosive atmospheres. This danger is
normally avoided with flue gas trim systems by adjustment so that in the case of failure the appliance will not
generate CO in excess of 400ppm in the flue. The CO level in the flue should be measured with a separate
CO instrument, normally an infrared or fuel cell type.
CAUTION 3
The oxygen probe is heated to over 700°C (1300°F) and is a source of ignition. Since raw fuel leaks can
occur during burner shutdown, the transmitter has an interlocking relay that removes power from the probe
heater when the main fuel shut-off valve power is off. If this configuration does not suit or if it is possible for
raw fuel to come into contact with a hot oxygen probe then the Model 1732 transmitter with a heated probe
will not be safe in your application.
An unheated probe can be utilised in such applications, however the oxygen readings are valid only above
650°C (1200°F).
CAUTION 4
The reducing oxygen signal from the transmitter and the associated alarm relay can be used as an explosive
warning or trip. This measurement assumes complete combustion. If incomplete combustion is possible
then this signal will read less reducing and should not be used as an alarm or trip. A true excess
combustibles analyser, normally incorporating a catalyst or thermal conductivity bridge, would be more
appropriate where incomplete combustion is possible.
Also read the probe electrical shock caution in the probe heater interlock caution in chapter 4.7
CAUTION 5
FIL-3 filter. If the optional FIL-3 has been fitted to the 1231 probe in this installation, please read the
Important Notice regarding probe option FIL-3 on the previous page
CAUTION 6
The heater is supplied from the mains power directly, and the temperature is controlled at 720°C (1330°F).
The outside of the process end of the probe can get to temperatures that are dangerous to touch. Wear
insulating gloves when handling a probe that has been on.
CAUTION 7
Please note that if this equipment is not installed and used in the manner described in this manual then the
safety protection provided by the equipment may be impaired.
August 2018 Technical Manual
1732 Oxygen Transmitter 7