Watlow TLM-8 - Manual

WATLOW TLM-8 User’s Guide 1
Watlow Controls
1241 Bundy Blvd., Winona, MN 55987
Customer Service
Phone: 1-800-414-4299
Fax: 1-800-445-8992
Technical Support
Phone: (507) 494-5656
Fax: (507) 452-4507
E-mail: [email protected]
Part No. 0600-2150-2000 Rev. D
Revised: October 2007
© 2004, 2007 Watlow Electric and Manufacturing Company. All
rights reserved.
TLM-8
User’s Guide
The TLM-8 is a multi-zone temperature limit switch.
For thermal system safety, the TLM-8 can satisfy the
requirement for independent temperature monitoring.
The TLM-8’s alarm outputs interface with visual and
audible alarm devices, or they can initiate safe shut-
down of equipment.
The TLM-8 has the following features:
• Multi-channel temperature monitoring
• Latching alarms
• Isolated sensor inputs
• Support for various thermocouples, RTDs, and
thermostats
• Diagnostic test mode
• Open-sensor fail-safe
• Compact and easy to install
• LED indicator lights
Up to eight temperature zones may be monitored. If
any temperature exceeds a trip point, the TLM-8 gen-
erates an alarm output. The alarm output may be used
for safety shutdown or annunciation. Alarm outputs
remain active until two conditions are met in sequence:
the temperature drops below the trip point and alarms
are acknowledged. Built-in indicator lights show power
and alarm states.
The TLM-8 accepts up to eight thermocouple, RTD or
thermostatic switch temperature sensors. There are
two global alarm relay outputs. The TLM-8 is also
available with eight channel-alarm relays in addition
to the two global relay outputs. If all temperatures are
below the trip point, the TLM-8’s relay outputs are
closed. When alarms activate, the relay contacts open.
Features and Description
Relays that open on alarm are consistent with fail safe
designs and practices. Alarms are acknowledged with
an optically isolated, digital input. Another isolated
digital input is used for testing, by simulating alarms
on all channels.

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TLM-8 System Diagram
Warranty
The TLM-8 is manufactured by ISO 9001-registered
processes and is backed by a three-year warranty to
the first purchaser for use, providing that the units
have not been misapplied. Since Watlow has no control
over their use, and sometimes misuse, we cannot guar-
antee against failure. Watlow’s obligations hereunder,
at Watlow’s option, are limited to replacement, repair,
or refund of purchase price, and parts which upon
examination prove to be defective within the warranty
period specified. This warranty does not apply to dam-
age resulting from transportation, alteration, misuse or
abuse. The purchaser must use Watlow parts to main-
tain all listed ratings.