Standard features – Atec Tenney-TJR-TUJR-THJR User Manual
Page 3
Standard Features
Construction
Construction
Construction
Construction
Construction
All models feature vapor-tight, continu-
ously welded stainless steel interiors.
Structural reinforcement is used at all
critical points. Through-wall ports are
continuously welded. A combination of
fiberglass and polyurethane insulation
surrounds the chamber to maximize
insulating characteristics, thus ensuring
minimal thermal transfer.
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Control System
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TH Jr
TH Jr
TH Jr
TH Jr.....
Proprietary VersaTenn controller
provides complete automatic chamber
control through a user-friendly alpha-
numeric display. The control is bi-
directional, proportional for heating,
cooling, humidification, and dehumidifi-
cation. The proportional band and the
reset are operator-adjustable. Logic
circuits automatically select cooling,
heating, and humidity modes 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.
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Control
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Toler
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olerance
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±0.3°C and ±2% RH typical after
stabilization.
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Control System
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Tenney Jr
enney Jr
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and
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TU Jr
TU Jr
TU Jr
TU Jr
TU Jr.....
The Watlow 942 controller provides
24-step progamming, or may be used as
a non-ramping manual controller.
Features include:
Data output that sends information
directly to a serial printer
Time-proportioned output
Zero voltage switching
Resolution
Resolution
Resolution
Resolution
Resolution
Setpoint and chamber temperature are
displayed with 0.1°C or 0.1°F resolu-
tion, and 0.1% RH on the TH Jr.
Sensor
Sensor
Sensor
Sensor
Sensors
s
s
s
s
A platinum RTD sensor measures
temperature. Humidity is measured by
an electronic, capacitive sensor that
requires no wet wick or water supply.
The sensors provide excellent control
and display accuracy with minimum
maintenance.
Refriger
Refriger
Refriger
Refriger
Refrigeration
ation
ation
ation
ation
System
System
System
System
System
Tenney Hermeticool®: air-cooled,
readily accessible hermetic system uses
accurately calibrated capillary tubes
rather than mechanical expansion
valves. This simplifies the system and
reduces the likelihood of leaks.
Humidity System
Humidity System
Humidity System
Humidity System
Humidity System
Tenney VaporFlo®: the humidity system
is constructed of 100% non-corroding
parts and is equipped with its own low-
water protection system. A transparent
Pyrex vessel permits easy inspection
and enables easy clean out and mainte-
nance. The system operates at atmo-
spheric pressure and is specially vented
to prevent undesired siphoning.
Heating System
Heating System
Heating System
Heating System
Heating System
Low-mass nichrome, open wire heating
elements are used to reduce thermal
lag and provide rapid response to instru-
ment demand. The heating elements are
isolated from the workspace to reduce
radiant influence on the test item.
Electrical
Electrical
Electrical
Electrical
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.
Conditioning
Conditioning
Conditioning
Conditioning
Conditioning
System
System
System
System
System
Uniform conditions are assured through
the use of a vertical-down recirculating
conditioning stream. The system draws
air from the bottom of the workspace,
conditions as required, then discharges
the air through a grille at the ceiling
level. The compact design of the cond-
itioning plenum allows the test chambers
to offer a larger proportional area of
interior volume to exterior volume than
afforded by conventional chambers.
Door
Door
Door
Door
Door
Since the units chamber is continuously
welded, the door remains as the final
sealing surface to maintain atmosphere
integrity. All doors are equipped with
double gaskets that trap air for the
purpose of insulation. On the TH Jr.
models, a unique, energy-efficient
system circulates hot gas from the
refrigeration system to provide auto-
matic defrost for the door gaskets, thus
ensuring pliable gasket conditions and
extending gasket life.
T-U Jr. temperature
test chamber provides maximum
performance with a minimum
footprint.