AMI Analyzer Manual
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10
Sensor Installation:
Open the probe cap, and remove the sensor from its bag. Place the sensor inside the probe in such a way
that the electrodes on the sensor (the little circuit board with the central gold-plated disk, and annular gold-
plated ring) are facing the connection springs within the probe.
Notes:
The unit is designed to be mounted on a suitable bracket in a general purpose area. It is not suitable for
installation in a hazardous area though it may be mounted outdoors if the temperature range does not
exceed the
25°F to 115°F (-4°C to 46°C)
for which it is rated. The probe should be mounted in such a way
that the gas fittings are on the bottom. The cable supplied is approximately 6 ft. long.
Do not mount it close to sources of electrical interference such as large transformers, motor start
contactors, relays etc. Also avoid subjecting it to significant vibration. Make sure that the sensor cable
does not run next to high-current cables, or AC cables. Preferably the sensor cable should be in its own
conduit.
Avoid mounting it in such a way that it will be subject to rapid temperature changes. For example, do not
mount it close to an outside door or air conditioning duct that will allow a sudden draft of cold or hot air to
blow on it.
If used as an area monitor the probe should be mounted where it will sense a representative sample of the
room air. If the room has no natural circulation, you may want to install a fan to make sure that there is
some air movement. The nature of the possible asphyxiating gas also should affect its placement - if the
danger is from a heavy gas such as CO
2
or SF
6
, the sensor should be mounted low down so that it detects
the gas before people start breathing it, while if the gas is light such as helium, the sensor should be
mounted higher. Otherwise it should normally be mounted at head height.
Operation
Calibration:
The sensor will stabilize within a few minutes, and it may be calibrated almost as soon as it has been
installed.
Probe only option:
No provision is made in the probe itself for calibration. It is expected that the display or monitoring device
will perform this function. The output of the sensor will vary by about +/- 20% between units, in other
words air will make the output come to somewhere between about and on a nominally output unit. The
following section is intended to provide tips on performing calibration.