Tenney Junior - 11 ALARM and SHUTDOWN CIRCUIT - Tempgard IV (Optional); System Description

TENNEY ENVIRONMENTAL
Tenney Junior Test Chambers: Models TJR and TUJR, W942, or WF4
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11.1 System Description
A comprehensive alarm and shutdown circuit may be provided for protection against product over/under
temperature. This optional feature utilizes a Watlow 93 Controller configured as a TempGard IV temperature
protector. The Watlow 93 is a microprocessor based controller that incorporates programmable high and low
temperature limits. A 100 ohm Platinum RTD is used for temperature measurement. It is placed near the
plenum in the downstream airflow, which is the most responsive area of the chamber. An Electrical
Schematic of the TempGard IV feature is included with this manual.
In the Model TUJR, the TempGard IV feature is integrated directly into the chamber power scheme. The
chamber comes equipped with a single power supply cord that plugs into a power supply receptacle.
In the Model TJR, the TempGard IV feature is enclosed in a separate control box and is mounted on top of
the unit. For shipping purposes, the TempGard control box is removed from the top of the unit and placed
inside the chamber workspace. The RTD wire that runs from the chamber thru the BX conduit and into the
TempGard control box is disconnected. The chamber power supply cord is unplugged from the TempGard
receptacle. Reference the following section for the complete wire and cable hookup procedure.
11.0
A
LARM and SHUTDOWN CIRCUIT - Tem
p
Gard IV
(
O
p
tional
)
TJR - Tem
p
Gard IV
TUJR - TempGard IV
TempGard IV
Control Box
TempGard IV Panel
TempGard IV Panel