TENNEY ENVIRONMENTAL
r--
Chambers are shipped with
HYS
=
4,
and db
=
-
3,
as shown on the top line in the above
examples. It
is
unlikely a change to these settings will be required. Fortunately, these settings
are not subject to "cold start" default, and will remain valid afler a power interruption. They are
held in EEROM, not battery-backed RAM.
The pre-programmed configuration of the Watlow
942
is
documented in the Test Report.
Please refer to this and the Watlow 942 user's manual for complete operational details. These
are found in the Supplemental Instructions Section.
Controller Versions
The Watlow 942 Controller is provided in four versions with the following nomenclature:
1.
The basic 24-step ramping control: 942A-3KDO-AE00
2.
Basic plus two events: 942A-3KD2-AE00
3.
Basic plus communications: 942A-3KDO-BE00
4.
Basic plus events and communications: 942A-3KD2-BE00
The nomenclature is printed on the back of the controller and can be seen when the chamber's
control panel
is
opened.
NOTE: The communications arrangement is isolated
RS232lRS423, RS422, EIA-485, or IEEE.
Each event output is through a mechanical relay having contacts rated
6
Amps,
120
or
240
VAC.
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