TENNEY
ENVlRVNMtN
I
AL
GENERAL DESCRIPTION
\
The Tenney ModelsT27, T65, Models BTS, BTC, and Models T6S. T6C throughT30S, T30C
series test chambers are designedto provide a temperature controlledenvironment.
Temperatureconditionsare attainedby recirculatingchamber air through a refrigeratedcooling
coil and open air nichromewire heaterelements.Air circulation is generated by a propeller
type fan directly driven by an externally mountedmotor.Non-CFCrefrigerantsare used in the
refrigeration systems of all Tenney chambers.
The suffix
'S'
inthe chamber modelnumberindicatesthat the chamber is equippedwith a
singlestage refrigerationsystem, incorporatingone compressor. The temperature controlled
rangefor these chambers is -40to +ZOO degrees Centigrade, a.3degrees Centigrade. The
exceptionto this standard rangeare the ModelsBTSand T6S, which have a low range of -34
degrees Centigrade.
The ModelsT27 andT65 also incorporate a single stage refrigerationsystem, but havea
smallertemperature operating rangethanthose mentioned above.This rangeis from -20 to
+I00degrees Centigrade,f0.21i0.3 degrees.
The suffix
'C'
inthe chambermodelnumberindicatesthatthe chamberis equippedwith a
cascade refrigerationsystem, incorporating two compressors. Thetemperaturecontrolled
rangefor these chambers is from -73 to +ZOO degreesCentigrade,i0.3 degrees Centigrade.
The exceptionto this standard range are the Models BTC and T6C, which have a low rangeof
-70 degrees Centigrade.
)
Temperature conditions are attained andcontrolledbya Watlow 942 microprocessorbased
controller, utilizing an RTDfor temperaturemeasurement.This controller provides24 step
programmingwith dual outputs inthe time-proportionedand ONIOFFmodes. It also may be
usedas a non-ramping manualcontroller.As options, you may have auxiliary event outputs
and RS232lRS423, RS422, EIA-485, or IEEEdata communicationswith the Watlow 942.
Your Tenney chamber may include many other uniqueoptions such as; TempGardIV feature
with the Watlow93 Controller for redundantproductoverlunder temperature protection, boost
coolingusing CO, or
LN,,
boostheating, purgeair system using compressedair or
GN,,
a two
channelchart recorder, and LinkTenn software that permitsyour computerto control up to 10
chambers.
As you can see, the Tenney Environmentaltest chamberis a diversifiedtool designedto
encompass a wide range of operatingconditions andfunctions. If you come upon any
questions as you continueonthrough the manual, pleasefeel free to contact our Service
Department.
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