Teledyne ULTRAFLOW 150, Руководство по эксплуатации, Страница: 12 / 162

ULTRAFLOW 150 GAS FLOW AND TEMPERATURE MONITOR
2.1.2.1.3 Extended Long Range Transducers (LR004 through LR007)
As pathlength, temperature, velocities and medium molecular weight
increase, the acoustic attenuation increases vigorously. As these factors
combine to challenge the signal strength of the Long Range Transducer
LR003, the Extended Long Range Transducers are used to obtain
satisfactory operation in these conditions. This family of transducers
(LR004 through LR007) uses a common transducer element design with
various purging and horn designs. These designs ensure accurate
measurement signals throughout the operating range of the most
challenging acoustic effluent conditions.
Consult the Site Specification Data sheet of Appendix A for information on
the transducer type of your individual monitor.
2.1.3 Protective Purge System
The Standard Purge System for Electrostatic Transducers consists of a
single blower that has a dual outlet and flow restriction device to provide
clean, proportioned purge air to each of the two Purge Nozzle Assemblies.
This configuration can be employed where the effluent pressures are
negative to modestly positive. Use of the single Protective Purge Air may
not be recommended in cases of high positive stack pressures. Long range
uses a dual blower system.
The Purge System provides filtered air to keep the effluent from
contacting the transducers. The air is injected into the stack through the
nozzles of these assemblies by actually having air blow around and in
front of the transducers. Each assembly has a purge air sensor switch that
remains activated as long as the purge air is flowing. If purge air is lost to
either transducer an indication is provided at the Enhanced Remote Panel.
2.1.4 Enhanced Remote Panel
2.1.4.1 Enhanced Remote Display
The Enhanced Remote Display is built with a modular design. It is 19”
rack mountable. The software is menu driven and uses a commercial
network communications platform. It
uses a membrane switch keypad, a 4 ½”
Liquid Crystal Display (LCD) with
graphics capability and a key lockout for
critical functions.
2.1.4.2 Multi I/O Board
The Multi I/O Board is installed in the Enhanced Remote Panel chassis
and has eight relay outputs, eight digital inputs, and four individually
2-3