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1. Introduction
1.1 Manual Contents Organization
This document is the operating, maintenance, and parts manual for the Model
1200 Table-Top soldering furnace built by SST International. The manual is
designed to assist operators, process engineers and service personnel in
understanding the machine’s capabilities, operation, and routine maintenance
requirements. A full description of the Model 1200 is contained in Section 1
together with specifications, safety information, and warranty statement.
Sections 2, 3, and 4 will be of specific interest to personnel who will set up,
program and operate the soldering system.
The service manual, beginning with Section 5, contains a trouble shooting guide
with detailed maintenance, repair, and parts identifying / ordering information.
Section 6 contains the documentation package with additional service information
where applicable.
The appendix, Section 7, contains the final acceptance report and operating
addenda for custom features or optional equipment.
1.2 Machine Description
The Model 1200 Table-Top soldering furnace is primarily intended for process
development work requiring highly repeatable control of vacuum, pressure, and
temperature. From vacuum levels of below 100 millitorr up to positive pressures
as high as 50 psig, the system operates automatically to evacuate, pressurize,
purge and exhaust on a time-based cycle. Two selectable gas inputs are available
and may be used throughout the entire temperature range with inert gas,
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/formic acid mix, (optional), or with air at temperatures below 200 °C.
Process parameters are controlled via an embedded off-the-shelf programmable
control system that allows heating, soaking, cooling, and pressurization to be
initiated at specific points in the time-based cycle. An integrated proportional-
integral-differential (PID) temperature control algorithm provides 1 °C
repeatability throughout the operating range of the furnace, 100 to 450 °C.
1.2.1 Process Section
The process section of the Model 1200 Table-Top soldering furnace is housed in a
custom built aluminum chamber. A graphite plate or “target” is heated directly
from below with radiant flux emitted from a graphite element operating between
ambient and approximately 1000 °C. The element is machined from a single
sheet of graphite that is designed to overlap the target plate and to minimize
unheated areas resulting in an extremely uniform flux field. The target plate can
be used directly as a hot plate or can be custom machined with features for
positioning components, inserts, and weights. Together with provisions in the
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