66
71-6417
Innova Series Operator’s Manual
Dilution Fitting
The Innova Transformer Gas Tester includes a 1:1 dilution fitting to provide
the necessary dilution ratio to mix one part sample with one part air.
Description
The catalytic detection method requires oxygen in order to function properly.
In an inert gas environment, it is necessary to provide oxygen by the use of
the 1:1 dilution attachment on the inlet fitting to oxidize the combustible gas.
The dilution fitting consists of a small tee fitting which plugs into the inlet
fitting of the instrument. It includes two small drilled orifices. One orifice
connects to the sample source and the other to atmospheric air. These are
proportioned to give a dilution of one part air to one part of sample.
If testing for combustible gas in a inert environment is attempted without the
dilution fitting, the Innova will respond briefly as the available oxygen is
exhausted in the flow block and the combustible readings will then return to
zero, providing an incorrect reading.
For testing oxygen content in transformers, the dilution fitting can be
removed. This will allow you to determine if there is oxygen present. This
test however, can only be performed with the Innova Transformer Gas Tester
with an active oxygen channel.
Operation
Before operating the Innova Transformer Gas Tester, it is important that you
read and understand the Innova Series Operator’s Manual. It is also extremely
important that you are familiar with the specific transformer that you are testing
and know how to safely extract a gas sample.
1. Turn on the Innova Transformer Gas Tester and allow the instrument
to warm up.
2. Perform fresh air adjustment as described in Chapter 2, Start Up &
Operation.
3. Connect the probe directly to the end of the Innova Transformer Gas
Tester.
4. Open the valve on the Tedlar bag by turning the top of the valve
counter clockwise two full turns.
5. To remove excess air from the Tedlar bag, connect the tubing from the
Tedlar bag to the end of the probe allowing the internal pump to draw
the air out of the gas collection bag. When the Innova alarms and
indicates “PUMP FAILED”, turn the valve clockwise until it is
completely closed, then remove the tubing from the end of the probe.
