Basler BE1-49, Instruction Manual

BE1-49 General Information 

1-1 

SECTION 1 • GENERAL INFORMATION

GENERAL

The BE1-49 Temperature Relay is a solid-state device that monitors the temperature of a remotely located
resistive temperature detector (RTD), and provides signals to the protective scheme when the sensed temperature
goes above or below predetermined limits. A variety of output options provide a selection of latching or non-
latching types of normally open or closed contacts.

DESCRIPTION

The Basler Temperature Relay supplies a constant current to a remotely located resistive temperature detector,
and senses the temperature of the detector by measuring the voltage across the resistive element. When a pre-
programmed temperature limit is reached, the relay energizes its output relay so that the protection scheme may
take appropriate action.

Programming of the temperature limits is accomplished by adjusting the UPPER TEMPERATURE LIMIT and
LOWER TEMPERATURE LIMIT controls on the relay front panel. Each control is adjustable over a range of 60°
to 190°C. The effect on the protection scheme of exceeding the control setting limits of the relay is defined by the
output option selected. Table 1-1 shows the available output options. The dotted horizontal lines represent
hypothetical upper and lower temperature limit settings. The circled numbers represent relay case terminals.

A target that indicates when the upper temperature limit has been exceeded is optionally available, and may be
either internally operated or current operated. The current operated target requires a minimum of 0.1 A to flow in
the trip circuit for proper operation. The internally controlled target MUST be specified if NC output contacts are
specified.

The relay assembly is mounted in a drawout cradle and enclosed in a standard, utility style case. Individual circuit
components are accessible by removing the individual printed circuit boards from the relay cradle and using an
extender board (Basler part number 9 1655 00 100) to test or troubleshoot.

MODEL AND STYLE NUMBER

The electrical characteristics and optional features included in a particular model BE1-49 Temperature Relay are
defined by a combination of letters and numbers that make up its style number. The model number, followed by
its style number, appears on the front panel, drawout cradle, and inside the case assembly.

The style charts represented by Figure 1-1, lists all available options and relates them to the style number system.
Upon receipt of a temperature relay, be sure to check relay style number against the requisition and packing list
to see that they agree.