2.1.2.3 Sample Exhaust Port
Pneumatic connection to the measured process for sample extraction is made at either of the two
interchangeable 1/8" FNPT fitting around the side of the flow-through head, but opposite the
installed sample inlet port (section 2.1.2.2). For connecting the sample exhaust to vent, use 1/8" or
1/4" rigid tubing and 1/8" MNPT fittings of a material compatible with process gas composition.
Select a vent location that is known to be at atmospheric pressure at all times. Use a minimum 2-
meters of tubing to prevent back-flow of vent gas to the sensor. Ensure that no grease, particulate,
or solvent is present in the tubing during installation. Use thread-tape to seal connections, and
prevent galling. Fix all sample tubing and connectors.
2.1.2.4 Sensor
The MAX-250 sensor pneumatic connection to the process gas stream is made at the M16x1
threaded flow-through head connection with a supplied top seal O-Ring and receptacle gasket.
Electrical connection to the model 1100 is made at the female SwitchCraft type #712A connector.
Connect the sensor to the flow-through head. Verify the supplied O-Ring is in place at the base of
the sensor, over the M16x1 threaded connector. Do not lubricate the O-Ring. Verify the supplied
gasket is seated in the bottom of the flow-through head sensor receptacle. Screw the sensor into
the flow-through head sensor receptacle, and hand-tighten. Do not over-tighten. The O-Ring and
gasket should be slightly compressed. Match the sensor threaded flow-through head connection
against the mating receptacle in the sensor flow-through head.
Attach the supplied sensor cable to the model MAX-250 oxygen sensor using the female
SwitchCraft type #712A connector. Hand-tighten the capture-ring to secure the connection. Match
the sensor electrical connection against the mating connector on the sensor interface cable. Slide
the protective sheath over the sensor. Fix all wiring and connectors.
Sampled process gas may be applied to the sensor flow-through head any time after the sensor is
attached to the flow-through head. Regulate sample gas to 1 to 3 psig at 1-SLPM flow rate. Do
not exceed 15" Hg vacuum or 7-psig at the sample inlet port. Never apply an unregulated gas
source to the sensor flow-through head.
2.1.3 Step 3 – Install the Analyzer
DANGER: Electrical connections on the rear of the Model 1100 Oxygen analyzer
may have hazardous voltages present once power has been applied to the unit. High
voltages may remain present for a short time even after power has been disconnected
from the analyzer. Take care in observing standard electrical practices when making
electrical connections to the Model 1100 Oxygen analyzer.
DANGER: The model 1100 analyzer is not rated intrinsically safe or explosion proof. Be
certain that no flammable gases are present in the area where the Model 1100 analyzer will be
installed.
CAUTION: The model 1100 housing is not rated waterproof. Do not mount the analyzer or
the sensor in an area where it may contact water or other liquid elements.
WARNING: Be certain that all power is OFF to the analyzer and associated wiring (cables)
before attempting installation. DO NOT WORK WITH LIVE WIRES! Do not leave any exposed
wire at the terminal blocks. Before applying power, ensure terminal blocks are fully inserted into
the mating connector at the analyzer.
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