Electrical Power; Model 83I - Thermo Scientific Mercury Freedom 80i Manual

Introduction

Model 83i

Electrical Power

Model 83i
1-6 Mercury System Manual
The Model 82i controls the temperatures of the probe, the heated
umbilical line, and converter (located within the probe). These
temperatures are set and recorded via the Model 80i.
The Model 82i provides both 220 and 110 AC voltage to the Model 83i
Probe. The 220 VAC powers the probe's stinger heater and filter/eductor
heater. The 110 VAC powers the Total Hg converter as well as 4 to 6
probe solenoid valves for cal/zero gas, stinger blowback, filter blowback,
and Hg spike.
The Model 82i has a dedicated 220 VAC feed to power the heated
umbilical line.
The Model 83i Mercury (Hg) Extraction Probe is configured as one
component of the Thermo Scientific integrated Hg Continuous Emission
Monitoring System (CEMS). The Thermo Scientific Mercury Freedom™
System is comprised of a Hg analyzer (Model 80i), a Hg Calibrator (Model
81i), a Hg Probe Controller (Model 82i), and a Mercury Extraction Probe
(Model 83i) along with additional peripheral components, such as a zero
air supply, umbilical, and instrument rack. The Model 83i with built-in
diluting probe has been designed specifically to monitor gaseous Hg
emissions from coal-fired power plants.
The system is housed in a stainless steel enclosure and is designed to meet
NEMA 4X specifications. To prevent sample condensation, all key
elements (filter, diluting probe and sample eductor) have been mounted
between heated aluminum blocks that can be maintained at temperatures as
high as 250 °C.
The enclosure also houses an accumulator tank for back purging of the
filter tube (blowback). External to the enclosure is a section with the
electrical connections, solenoids for filter and stinger blowback, cal gas, an
Hg spike, a differential pressure transducer, and an additional pressure
transducer for the pressure at the critical orifice.
A special four-inch adapted mounting flange has been supplied for
installation onto the port of the stack or duct.
Clean dry pressurized (~85 psig) air/nitrogen feeds two electronic pressure
regulators in the Model 82i, which adjust and maintain output pressure to
the Model 83i probe eductor and blowback pneumatics (Figure 1–4).
Pressurized (~65 psig) Hg-free zero air feeds a third electronic regulator in
the Model 82i, which adjusts and maintains dilution air pressure to the
Model 83i probe dilution Module. Also contained within the Model 82i
are three electronic pressure transducers associated with the individual
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