Model 83I Gc - Thermo Scientific Mercury Freedom 80i Manual

Introduction

Model 83i GC

Model 83i GC
1-10 Mercury System Manual
The high temperature, dilution-based Model 83i GC Hg Non-Inertial
Dilution Probe is compact, light weight, and modular in design for ease of
both serviceability and manufacturability. The Model 83i GC consists of
the following four functional sections:
Heated Probe Barrel Assembly
●
Heated Filter Probe Assembly
●
Gas Conditioning Tray Assembly
●
Electro-Pneumatic Tray Assembly
●
The heated filter probe, gas conditioning tray, and electro-pneumatic tray
are housed in an enclosure assembly consisting of a stainless steel chassis
that is shielded by a one-piece, epoxy-painted aluminum cover. In order to
prevent sample condensation, all key elements (particulate filter block
assembly, dilution eductor assembly, bypass eductor assembly, and sample
flow orifice assembly) are heated and controlled to temperatures as high as
260 °C (500 °F). The sample stinger tube is also heated to a temperature
exceeding 500 °F in order to prevent sample condensation and mercury
adsorption prior to entering the filter block assembly.
The standard heated probe barrel assembly consists of a six-foot long by
1/2-inch OD Hastelloy C sample stinger tube that is encased by a one-inch
OD, schedule 40, 316SS welded pipe/flange assembly. A five-foot long,
240 VAC/600 W coiled, cable heater envelops the 1/2-inch OD sample
stinger tube within the annular space formed inside the one-inch OD pipe
housing. The sample inlet temperature is maximized by operating the
heater with continuous full power, which prevents sample condensation
and minimizes mercury adsorption on to the stinger tube. The tip of the
sample stinger, which contacts the stack or process gas, is shielded by a
Hastelloy C shroud assembly in order to minimize the entry of sample
particulates and mist into the system. The heated probe barrel assembly is
supported by one-foot long, 1 1/2-inch OD, schedule 40, 316SS welded
pipe/flange assembly attached to the enclosure chassis. The probe barrel
assembly is fully retractable without removing the probe enclosure as it
attaches and seals to the probe support assembly flange from inside the
enclosure chassis.
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