Watlow Ltd- Reference - Guides and Tutorials

Agency Standards for Temperature and Power Controllers

In certain applications, the control circuit electronics and associated system hardware requires testing by an independent agency to meet specific construction and operation requirements with respect to hazards affecting life and property. The following are the standards to we apply, where applicable, to the controller products we design and build:

American Gas Association

A.G.A. Std ANSI Z 21.23-1993---Gas Appliance Thermostats and Z21.23a -1994

Canadian Standards Association

C22.2 No. 24-M1987---Temperature Indicating and Regulating Equipment
C22.2 No. 109-M1981 Commercial Cooking Appliances
C22.2 No. 14-M1987 Industrial Control Equipment
C22.2 No. 177, 1992 Clock Operated Switches

European EMC and Low Voltage Directives

EN 50081-1---EMC Generic Emissions Standard/Residential, Commercial and Light Industrial
EN 50081-2---EMC Generic Emissions Standard/Industrial Environment
EN 50082-1---EMC Generic Immunity Standard/Residential, Commercial and Light Industrial
EN 50082-2---EMC Generic Immunity Standard/Industrial Environment
EN 60730---Specification for Automatic Electrical Controls (Household)
EN 61010---Safety Requirements for electrical Equipment for Measurement, Control and Laboratory Use
EN 60950---Specification for Information Technology Equipment
VDE 0160---Electronic Equipment for Use In Power Installations
VDE 0805---Safety of Information Technology Equipment, Including Business Equipment
prEN 50178---Electronic Equipment for Use In Power Installations-Preliminary

Factory Mutual

FM---Class 3545 Approved Temperature Limiting Switch NSF International
ANSI/NSF 1996---Commercial Cooking, Rethermalization and Powered Hot Food and Transport Equipment
NSF C-2, 1983---Special Equipment and/or Devices (Foodservice) Underwriters Laboratories (UL^®)
UL 50 (C-UL)---Type 4X Enclosure (NEMA 4X, IP65 for European Manufacture)
UL 197 (C-UL)---Commercial Cooking Appliances
UL 508 (C-UL)---Industrial Control Equipment
UL 873 (C-UL)---Temperature Indicating and Regulating Equipment
UL 917 (C-UL)---Clock Operated Switches
UL 991 (C-UL)---Tests for Safety- Related Controls Employing Solid State Devices

Watlow furnishes many stock products that have recognition for various agency file numbers, including the new European Union Directives.

Please consult your local Watlow sales office for special assistance regarding your unique requirements.

UL® is a registered trademark of the Underwriters Laboratories, Inc.

Controller Quick Reference Guides

Power Controller Comparison Guides

Temperature Sensor Comparison Guides

Corrosion Guide (PDF)

Maximizing Heater Performance

General Method for Determining Heater Requirements

Evaluating Sensor Placement In A Thermal System

Agency Standards for Temperature & Power Controllers

Supplier Selection Criteria

Watlow Ltd Linby Industrial Estate, Linby, Nottingham, NG15 8AA +44 115 964 0777 Fax - +44 115 964 0071