TENNEY ENVIRONMENTAL
Tenney Junior Test Chambers: Models TJR and TUJR, W942, or WF4
Page 7
Application:
This manual applies to the following reach-in temperature test chambers, which employ a capillary tube type
refrigeration system.
Model TJR: Tenney Junior - Benchtop Unit
Model TU-JR: Tenney Junior - Upright Unit
Specifications:
♦ Temperature Range: -75 to +200 degrees Celsius, ±0.3 degrees Celsius
♦ Workspace: 15-5/8" W x 11" D x 11-3/4" H (40 W x 28 D x 30 H Centimeters)
Note: This manual may also apply to special chambers with alternate model numbers (listed below).
For Model XXXX, S/N xxxxx, the following custom specifications apply:
♦ Temperature Range: - xx° to + xxx° C, +/- xx deg. after stabilization
Environmental Conditioning Functions:
♦ Heating of the chamber is achieved by recirculating chamber air through open-air nichrome wire heater
elements.
♦ Cooling of the chamber is achieved by recirculating chamber air through a refrigerated cooling coil in
the chamber conditioning section. The chamber is equipped with a cascade refrigeration system. Non-
CFC refrigerants are used.
♦ Air circulation is generated by a propeller type fan, which is driven by an externally mounted motor.
Temperature Controller:
Either the standard Watlow 942 Controller or the optional Watlow F4 Controller is used for temperature
control. The type used is indicated on the manual cover page.
♦ Watlow 942 (Standard): The Watlow 942 Controller is a ¼ DIN profiling type controller. Profile
operations include 24-step program capability, time/temperature profile - rate, or time - based
programming, guaranteed soak deviation, and program looping. The W942 can also be used for simple
single, or fixed set point operation.
An RTD sensor is used for temperature measurement. Dual outputs are configured in the time
proportioned, On/Off, or switched dc modes. Two optional auxiliary outputs can be set up as alarms, or
3.0 PRODUCT SPECIFICATIONS & OVERVIEW
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