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51-650 Echotel SIL Safety Manual

2.0

Applicable Models

This manual is applicable to the following models of the

Echotel ultrasonic level switches with relay output or

current shift output:

• Model 961 Single Point Level Switches

• Model 962 Dual Point Level Switches

3.0

Mean Time To Repair (MTTR)

SIL determinations are based on a number of factors including

the Mean Time To Repair (MTTR). The analysis for the

Echotel Model 961/962 ultrasonic level switch is based on

a MTTR of 24 hours.

4.0

Supplementary Documentation

Refer to the following documents as supplements to this

Echotel Model 961/962 SIL Safety Manual:

• Echotel Model 961/962 Ultrasonic Single and Dual Point

Level Switches Installation and Operating Manual

• Magnetrol Model 961 AC/DC Ultrasonic Level Switch with

Relay Output, Failure Modes, Effects, and Diagnostic Analysis

• Magnetrol Model 961 Loop-Powered Ultrasonic Level

Switch, Failure Modes, Effects, and Diagnostic Analysis

• Magnetrol Model 962 AC/DC Ultrasonic Level Switch with

Relay Output, Failure Modes, Effects, and Diagnostic Analysis

• Magnetrol Model 962 Loop-Powered Ultrasonic Level

Switch, Failure Modes, Effects, and Diagnostic Analysis

NOTE: The Failure Modes, Effects, and Diagnostic Analysis (FMEDA)

reports can be found in the Downloads tab of the Echotel

961/962 on our website at: www.magnetrol.com.