The Alarms Function - Teledyne 2020 Operating Instructions Manual

Thermal conductivity analyzer

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Table of Contents

Thermal Conductivity Analyzer

plings and displays this difference as Slope on the screen. It takes several

seconds for the first Slope value to display. Slope indicates rate of change of

the Span reading. It is a sensitive indicator of stability.

When the

press Enter . (Generally, when the

the range being calibrated for a period of ten minutes it is sufficiently sta-

ble.) Once Enter is pressed, the

The instrument then automatically enters the Analyze function.

4.5

The Model 2020 is equipped with 6 fully adjustable set points concen-

tration with two alarms and a system failure alarm relay. Each alarm relay

has a set of form "C" contacts rated for 3 amperes resistive load at 250

V ac. See Figure in Chapter 3, Installation and/or the Interconnection

Diagram included at the back of this manual for relay terminal connections.

The system failure alarm has a fixed configuration described in chapter

3 Installation.

The concentration alarms can be configured from the front panel as

either high or low alarms by the operator. The alarm modes can be set as

latching or non-latching, and either fail-safe or non-fail-safe, or, they can

be defeated altogether. The setpoints for the alarms are also established

using this function.

Decide how your alarms should be configured. The choice will depend

upon your process. Consider the following four points:

1. Which if any of the alarms are to be high alarms and which if

2. Are either or both of the alarms to be configured as failsafe?

value displayed on the screen is sufficiently stable,