Installation - Ametek 270SF Instruction Manual

Installation

The probe tube (stinger) should be screwed into the 1/2" NPT fitting on the inside of the mounting flange. To prevent
galling, coat the threads with an anti-seize compound. Remove and anti-seize compound from the inner wall of the probe
tube before attaching it to the probe. The length of the probe should be selected to extend into the center third of the
stack; or if the stack diameter is greater than 12', at least 6' into that stack. The studs on the mounting flange should be
joined to the sampling nozzle on the stack and the assembly bolted into place.
A heated sample line should be supported close to the Model 270. The heated sample line should be fed through the heat
shrink boot on the bottom of the enlcosure. Connect the sample tube to the center tubing fitting (3/8") on the filter. The
unheated portion of the sample line should be kept short and insulated to avoid condensation. Connect the calibration
gas line to 1/4" tubing fitting located on the left side of the chamber and is connected to the chamber via a check valve. If
the compressed air line is part of the heated sample line, it can be connected to the 1/4" fitting adjacent to the blowback
accumulator. If an external air line is to be used for blowback, bring the air into the enclosure through a bulkhead fitting
(supplied by others) to be installed in the wall of the enclosure, typically the mounting location is in the bottom of the
enclosure, and connect the air to the same 1/4" fitting.
Provide power to the terminal block(s) within the stack filter enclosure in the Model 270. 150 watts (without heated
enclosure) or 350 watts with heated enclosure, at 115/230VAC is required.
NOTE: The supply power circuit MUST include an overprotection device with a maximum rating of
20A. A disconnect switch must be located in close proximity to the probe.
A thermal switch mounted in the aluminum heater will control the temperature to 340°F (171°C). Insure the
power supplied to the heater matches the heater voltage requirement shown on the serial number tag. The
voltage requirement can be changed by changing the jumpers on the terminal strips (reference terminal strip
label or drawings for details). An independent ground wire should be run to the grounding terminal on
the terminal strip.
If an independent measurement and display of the oven temperature is desired, a temperature sensor can be slipped into
a 1/8" diameter thermowell supplied on the heater tube assembly.
The final installation step is to insure that the sample line is insulated completely. Close the cover of the enclosure and
secure the latches. After securing the heated sample line, use a heat gun to shrink the entry boot onto the sample line.
The goal is to keep the temperature of the gas sample at a temperature above the dew point of the gas all the way from
the stack to the sample cooler/dehydrator.
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