Standard features – Atec Tenney-T-Shock-JR User Manual

Page 3

Standard Features

System

System
Configur

Configur

Configuration

ation

Thermal shock testing is achieved by
quickly and repeatedly transferring a
specimen between a hot and cold
station by a means of an automatic
work transfer basket. The transfer
method is more efficient than cooling
and heating a specimen within the same
compartment. Most systems are
available in either a horizontal or
vertical orientation.

Thermal shock chambers are
offered in three configurations:

Two-Zone Operation
Three-Zone Operation
Dual Load Operation

Two-Zone Operation

The product is transferred, by means of
a product basket transport system
between hot and cold chambers

Thr

Three-Zone Oper

ee-Zone Oper

ee-Zone Operation

ation

In this arrangement, the cold chamber
is stationary and the carriage moves in
and out of the cold chamber. The hot
chamber moves back and forth over
the carriage, which when not covered
by the hot chamber or residing in the
cold chamber dwells in ambient air. The
ambient-exposure can be programmed
out, resulting in two-zone hot-cold
operation. The chamber conditioning
systems operate continuously, allowing
continual production testing and
maximum throughput.

Dual Load Oper

Dual Load Operation

ation

The product is transferred horizontally
between hot and cold chambers in a
two-basket transfer carriage. Three
chambers are used, one hot chamber at
each end and a cold chamber in the
center. This configuration allows
uninterrupted operation of the cold
zone, doubling product load handling
capability for high production applica-
tions while increasing operation
efficiency and decreasing operation
costs.

Construction

All models feature vapor-tight,
continuously welded stainless steel
interiors. Structural reinforcement is
used at all critical points. Through-wall
ports are continuously welded. A
combination of fiberglass and polyure-
thane insulation surrounds the cham-
ber to maximize insulating characteris-
tics, thus ensuring minimal thermal
transfer.

Contr

Control System

ol System

Proprietary VersaTenn controller
provides complete automatic chamber
control through a user-friendly alpha-
numeric display. The control is bi-
directional, proportional for heating
and cooling. The proportional band
and the reset are operator-adjustable.
Logic circuits automatically select
cooling and heating as required.

99 step programming capability with
step-interval length of 99 hours.
Ability to store up to 10 resident
programs.
Looping and nested-loop capability.
Loops can be repeated up to 255
times. Infinite looping is possible.
Time intervals are programmable in
seconds, minutes, and hours.
Time-of-day start and delayed-start
functions up to two weeks.
Guaranteed soak feature.
Non-volatile memory for up to 5
years of power-off protection of RAM.
Digital selection and display of actual
conditions.
Timing control cycle may be
manually interrupted, and will “hold”
the test until reactivated.

Contr

Control

ol T

Toler

oler

olerance

ance

±1°C typical after stabilization.

Resolution

Setpoint and chamber temperature
are displayed with 0.1°C or 0.1°F
resolution.

Refriger

Refrigeration

ation

System

All thermal shock chambers, with
the exception of the T-Shock Jr., utilize
an efficient water-cooled cascade
refrigeration system designed to
operate with maximum loads for
continuous periods of time. The
T-Shock Jr. features an air-cooled
cascade system.

Heating System

Low-mass nichrome, open wire heating
elements are used to reduce thermal
lag and provide rapid response to
instrument demand. The heating
elements are isolated from the
workspace to reduce radiant influence
on the test item.

Electrical

All wiring complies with NEC. Circuit
breakers are used throughout the
electrical system and are located, along
with other electrical components, in a
readily accessible, integral control panel.

Door

Since the unit’s chamber is continu-
ously welded, the door remains as the
final sealing surface to maintain atmo-
sphere integrity. All doors are
equipped with double gaskets that trap
air for the purpose of insulation. A
unique, energy-efficient system circu-
lates hot gas from the refrigeration
system to provide automatic defrost
for the door gaskets, thus ensuring
pliable gasket conditions and extending
gasket life.

ransport System

ansport System

Carriage transport is automatically
controlled and positioned. The system
includes a large wire mesh stainless
steel product basket, which allows free
circulation of conditioned air around the
product load under test. The transport
carriage includes rigid, insulated end
plugs that seal with concentric-
compression gaskets, assuring tight
seals and minimal frosting.