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Standard features – Atec Tenney-TJR-TUJR-THJR User Manual

Page 3

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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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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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±0.3°C and ±2% RH typical after

stabilization.

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Tenney Jr

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TU Jr

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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 unit’s 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.