low Controls; ask for application assistance.
Disclaimer of Warranty
This document is a presentation of a general overview and statement of the safety-related need for and method of applying
over/undertemperature protection. Because of the diversity of conditions and hazards under which control products may be
applied and because of the differences in components and methods of their installation, no representation or warranty
of any kind, express or implied, is hereby made, that the limit control protection discussed and presented herein will be
effective in any particular application or set of circumstances, or that additional or different precautions will not be reasonably
necessary for a particular application. We will be pleased to consult with any customer regarding a specific application upon
written request.
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Watlow Controls
1241 Bundy Boulevard, P.O. Box 5580, Winona, Minnesota USA 55987-5580
Phone: 507-454-5300, Fax: 507-452-4507, Internet: http://www.watlow.com
Failure of components in a temperature control loop, such as the sensor, heater control relay,
or main temperature control, can result in damage to a product in process, a meltdown of a
heater, and/or a damaging fire.
To protect against this possibility, over/undertemperature protection must be provided to
interrupt or remove power from the heater circuit. A thermal fuse line at the heater, or a
mechanical thermoswitch at the heater are examples of recommended over/under temperature
protection. For precise, repeatable limit protection, an electronic limit control may be used.
We recommend the temperature protection device have UL, CSA, or FM approval, and be
applied in the classification for which it was tested and approved. An example of a single phase
wiring line diagram appears below.
WARNING
Install high or low temperature control protection in systems where an overtemperature
or undertemperature fault condition could present a fire hazard or other hazard. Failure
to install temperature control protection where a potential hazard exists could result in
damage to equipment and property, and injury to personnel.
STOP Limit Controls from Watlow
0600-0004-0001 Rev. D, September 2003
Series L LV / LF Limit
Open board, potted
case, DIN-rail
mount or panel
mount 1/8 DIN
square package
styles
Fixed or push-to-
set adjustable set
point operation
High or low limit
with auto or manual reset on power loss
Remote reset capability
Celsius or Fahrenheit indication (factory selectable)
Sensor break protection to de-energize system for safety
Operating environment:
0 to 70°C (32 to 158°F)
0 to 90% RH, non-condensing
Agency approvals:
Series LF (potted version only)
- UL 991 recognized temperature limit for cooking
industry
Series LV and Series LF (including potted version)
- UL 873 recognized temperature regulator
- ANSI Z21.23 Gas appliance thermostat approval
- FM Class 3545 temperature limit switches
Series 97 1/16 DIN Limit
Programmable mes-
sages to display user
programmed limit and
safe message
Microprocessor-based
for accurate set point
settings and quick out-
put response
Remote reset capability
Four outputs for high/low limit, alarms, communication,
retransmit requirements
Software and hardware lockouts for high security
Aesthetic match of Series 96 temperature controller
Operating environment:
0 to 65°C, 32 to 149°F
0 to 90% RH, non-condensing
NEMA 4X, 12, IP65 case makes the control water and
corrosion resistant
Agency approvals: FM, CE, NEMA 4X, 12, and IP65
Your Authorized Watlow Distributor is:
Series SD Family of Limit Controllers
Available in a 1/32, 1/16,
1/8 (horizontal or vertical)
or 1/4 DIN package
Up to three outputs (two on
1/32 DIN model) provide
high and low limit/alarm
capacity
Lockout functions for
increased security
Flexible high/low alarm output notifies of trouble with
flashing display message
Programmable dual display default shows actual, limit,
blank or alarm default display information
Aesthetic match for Series SD, 96 and F4 PID controllers
Operating environment:
-18 to 65°C (0 to 149°F)
0 to 90% RH, non-condensing
Agency approvals: FM, CE, NEMA 4X, 12, IP65, and NSF
TLM Series Multi-Channel Limit Monitor
Eight channel monitoring in a single
compact package
Multiple sensor types (one sensor type
per TLM)
Selectable limit set points for each
channel. TLM-8P has field adjustable
limit set points.
Sub-panel mounting
Flexible interlocks
Self-test diagnostics
Latching alarms
Operating environment:
0 to 60°C (32 to 140°F)
0 to 90% RH, non-condensing
Agency approvals: FM, CE, UL listed, C-UL listed
Watlow Controls
1241 Bundy Boulevard, P.O. Box 5580
Winona, Minnesota 55987-5580
Ph: 507-454-5300, Fax: 507-452-4507
Internet: http://www.watlow.com
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2404
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TOTAL
3 Year Warranty
CUSTOMER
SATISFACTION