Teledyne ULTRAFLOW 150, Operation Manual, Page: 70 / 162

ULTRAFLOW 150 GAS FLOW AND TEMPERATURE MONITOR
7.2 SITE SELECTION
Without question, the single most important factor affecting overall
performance of any continuous monitoring device is that of site selection.
If this decision is not made prudently, then monitor accuracy and
reliability will suffer.
7.2.1 Representative Sampling Location
Since the Ultraflow 150 uses an "across stack", non-contacting sampling
technique, it measures the average flow velocity along a path from one
transducer to another, which passes through the center of the stack or duct.
Although this technique is inherently more representative than point
sampling schemes, complex flow patterns in the vicinity of bends or
obstructions may potentially cause the monitor's sample path to be
unrepresentative of the total flow velocity and volume. Teledyne Monitor
Labs Installation Drawing ULTRAFLOW 150 FLANGE
INSTALLATION contains minimum recommended location distances
from upstream and downstream bends, which should allow for proper
sampling. However, due to the complexity of the fluid dynamics of these
types of gas streams and their dependence on individual site geometry, the
burden of responsibility for testing to determine the flow characteristics at
the site location is solely that of the user. Please consult the Teledyne
Monitor Labs factory for details.
7.2.2 Access to Sampling Location
Ease of access to the stack mounted equipment is a factor that is nearly
always underrated when deciding on an installation site. If the monitor
location is only accessible via vertical ladders with extensive climbing
involved or in exposed outside areas where maintenance personnel are
subject to extremes of wind, precipitation, or temperature, then monitor
maintenance will suffer adversely in the long term. Without proper
maintenance, reliability decreases and the access problems extend monitor
outage during repair.
7.2.3 Environmental Conditions at the Sampling Location
The other important factor involved in site selection is to consider the
potential conditions of the area where the Transducer Interface Enclosure
and Purge System will be located. Ambient conditions at this location
must not exceed the temperature range specified in the Teledyne Monitor
Labs specifications. This will void the Teledyne Monitor Labs warranty.
The presence of potentially corrosive or toxic gases in the ambient air in
the vicinity of the Transducer Interface Enclosure and Purge Air System
may deteriorate the condition of electrical connections such as IC sockets,
connectors, etc., in the electronic assembly. This may also greatly reduce
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