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Series 142
User’s Manual
Safety High Limit or
On-Off Heat Controller
1241 Bundy Boulevard, P.O. Box 5580, Winona, Minnesota USA 55987-5580
Phone: +1 (507) 454-5300, Fax: +1 (507) 452-4507,
Internet: http://www.watlow.com
The Watlow Series 142 Safety Limit is a compact,
environmentally protected safety limit or temperature
controller. The limit has a single thermocouple input and
is available in several common ranges.
The Series 142 Safety Limit has a single mechanical
relay output, and operates as a high limit, latching control
with manual and/or auto-power reset. Fixed set points are
available.
The Series 142 Safety Limit controller is ideally
suited for limit applications requiring tamper-proof opera-
tion, agency approvals and immunity to hostile environ-
ments.
• The factory-fixed set point cannot be altered by operator
action or neglect.
• Agency approvals ensure compliance with recognized
standards.
• Epoxy potting makes the Series 142 resistant to envi-
ronments with vibration or humid/corrosive conditions.
Compact size and sub-panel mounting make the
Series 142 readily adaptable to many applications. Its
single, factory-fixed set point thermocouple input and
Form C, 3 amp electromechanical relay output provides
simplicity and reliability for many applications. Sensor
break protection ensures fail-safe process shut down upon
input failure.
We use note, caution and warning symbols through-
out this manual to draw your attention to important oper-
ational and safety information.
A “NOTE” marks a short message to alert you to an
important detail.
A “CAUTION” safety alert appears with information
that is important for protecting your equipment and per-
formance. Be especially careful to read and follow all
cautions that apply to your application.
A “WARNING” safety alert appears with information
that is important for protecting you, others and equipment
from damage. Pay very close attention to all warnings that
apply to your application.
The safety alert symbol, ç, (an exclamation point in
a triangle) precedes a general CAUTION or WARNING
statement.
The electrical hazard symbol, Ó, (a lightning bolt in a
triangle) precedes an electric shock hazard CAUTION or
WARNING safety statement.
Safety Information
General Description
TOTAL
3 Year Warranty
CUSTOMER
SATISFACTION
0600-0023-0000 Rev E
March 2002
Supersedes
0600-0023-0000 Rev D
$5.00
Made in the U.S.A.