Magnetrol Echotel 961 Functional Safety Manual Download Page 1 | Manualshive

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Magnetrol Echotel 961 Functional Safety Manual Download Page 1

Ultrasonic

Level Switches

SIL Safety Manual for
Echotel

®

Model 961/962

Application

Echotel

®

Model 961/962 ultrasonic level switches utilize

pulsed signal technology to detect high, low, or dual-
point level in a broad range of liquid media applica-
tions. The advanced self-test technology provides relia-
bility and continuous testing of electronics, transducer,
piezoelectric crystals, and electromagnetic noise.

Benefits

The Echotel Model 961/962 ultrasonic level switches
provide the following benefits:

• Single or dual point liquid level measurement

• Adjustable time-delay for turbulent aerated liquids

• Reliable liquid level measurement independent of

changes in media density, conductivity, or temperature

• Relay output or mA current shift with separate

malfunction indication

• Integral or remote mount electronics

• Pulsed signal technology

• Extensive FM, CSA, and ATEX explosion proof and

intrinsically safe approvals

• Suitable for Safety Integrity Level (SIL) 2 loops

Functional Safety Manual

This manual complements and is intended to be used with
the Magnetrol

Echotel

®

Model 961/962 Ultrasonic Single and

Dual Point Level Switches Installation and Operating Manual

(Bulletin 51-646, dated October 2008 or later).

Model 961

Model 962

1
2
3
...
»

Summary of Contents for Echotel 961

Page 1: ...dual point liquid level measurement Adjustable time delay for turbulent aerated liquids Reliable liquid level measurement independent of changes in media density conductivity or temperature Relay output or mA current shift with separate malfunction indication Integral or remote mount electronics Pulsed signal technology Extensive FM CSA and ATEX explosion proof and intrinsically safe approvals Sui...

Page 2: ...c Specific Installation 8 5 5 2 Pump Specific Installation 8 5 6 Configuration 8 5 6 1 Time delay Potentiometer 8 5 6 2 Level Test Push Button 8 5 6 3 Malfunction Test Push Button 9 5 6 4 High Low DIP Switch 9 5 6 5 Independent Joint DIP Switch 9 5 6 6 Loop Test Push Button 9 5 6 7 Fault Test Push Button 10 5 6 8 22 3 6 DIP Switch 10 5 6 9 PC LC DIP Switch 10 5 7 Site Acceptance Testing 10 5 8 Mai...

Page 3: ...dia but are attenuated when the gap is dry Model 961 962 switches use an ultrasonic frequency of 2 MHz to perform this liquid level measurement in a wide variety of process media and application conditions The transducer uses a pair of piezoelectric crystals that are encapsulated in epoxy at the tip of the transducer The crys tals are made of a ceramic material that vibrates at a given frequency w...

Page 4: ... length of the transducer for extra rigidity Kynar faced 316 SS flange options are offered with the Kynar transducers 1 3 Determining Safety Integrity Level SIL Tables 1 and 2 define the criteria for the achievable SIL against the target mode of operation in Demand Mode Operation Table 1 shows the relationship between the SIL and the Probability of Failure on Demand Average PFDavg Table 2 can be u...

Page 5: ... 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 96...

Page 6: ...ing temperature for the transducer is dependent on transducer material see Table 3 5 1 3 Operating Pressure Maximum operating pressures are dependent on the trans ducer material Refer to Section 3 4 in the Echotel Model 961 962 Ultrasonic Level Switches Installation and Operating Manual Bulletin 51 646 5 1 4 Environmental See Section 3 4 of the Echotel Model 961 962 Ultrasonic Single and Dual Poin...

Page 7: ...in 51 646 5 5 Installation The Model 961 single point switch may be used for high or low level alarm overfill protection or seal pot level and pump protection Model 961 can be mounted vertically or horizontally in vessels bridles or pipes The Model 962 dual point switch may be used to measure high low high high or low low levels It can be used as a level controller or to control pumps in an auto f...

Page 8: ...or wet wells The tip sensitive lower gap allows liquid levels to be pumped down to within 1 4 from the bottom of the vessel The rigidity of the flow through upper gap allows the Model 962 to be used even when sumps experience severe turbulence from vessel fill lines 5 6 Configuration Refer to Section 2 5 in the Echotel Model 961 962 Ultrasonic Single and Dual Point Level Switches Installation and ...

Page 9: ... Switches Installation and Operating Manual Bulletin 51 646 for high low DIP switch configuration tables 5 6 5 Independent Joint DIP Switch The I J DIP switch is used to configure the SPDT malfunc tion relay to act independently or jointly with the DPDT process level relay In the factory set I position the SPDT and DPDT relays act independent of each other In the J position both the SPDT and DPDT ...

Page 10: ... configuration only 5 6 9 PC LC DIP Switch The PC LC DIP switch is used to select pump control PC or level control LC mode In PC mode the switch func tions as a pump controller where the relays latch to enable an auto fill or auto empty operation In LC mode the switch functions as a level controller where the relays oper ate independently of each other See Section 2 5 of the Echotel Model 961 962 ...

Page 11: ... TEST FAULT 961 with current shift LOOP TEST FAULT 962 with 5 amp relays LEVEL TEST FAULT 962 with 5 amp relays LOOP TEST 16 mA Table 5 Troubleshooting Faults and Corrective Actions Flashes Fault Action 1 flash Indicates a problem with either the transducer piezoelectric crystals or the interconnection wiring Check wiring inside the housing to make sure that all wires are secure in their respectiv...

Page 12: ...following parameters are observed FIT Failure in Time 1 10 9 failures per hour Product Model 961 Loop Powered Model 961 AC DC Line Powered Model 962 Loop Powered Model 961 AC DC Line Powered SIL 2 2 2 2 Proof Test Interval 1 Year 1 Year 1 Year 1 Year SFF 91 4 92 0 91 8 91 5 PFDavg 1 61E 04 1 77E 04 1 87E 04 2 31E 04 λsd 0 FIT 0 FIT 0 FIT 0 FIT λsu 96 FIT 106 FIT 110 FIT 130 FIT λdd 288 FIT 351 FIT...

Page 13: ...ed System SIS usage in a particular Safety Integrity Level SIL A more complete listing of failure rates is provided in Section C 4 of the FMEDA for the 961 Loop Powered Switch 6 2 2 Model 961 AD DC Ultrasonic Level Switch with Relay Output The Model 961 ultrasonic level switch is a complex device and is classified as Type B according to IEC 61508 having a hardware fault tolerance of 0 The Model 96...

Page 14: ...d in Table 1 of the FMEDA for the 962 Loop powered Switch 6 2 4 Model 962 AC DC Ultrasonic Level Switch with Relay Output The Model 962 ultrasonic level switch is a complex device classified as Type B according to IEC61508 having a hardware fault tolerance of 0 The Model 962 ultrasonic level switch is an 18 32 VDC or 102 265 VAC power device that pro vides relay outputs The Model 962 has only one ...

Page 15: ...nd its operating conditions This assumption of a constant failure rate is based on the bathtub curve Therefore it is obvious that the PFDavg calculation is only valid for components that have this constant domain and that the validity of the calculation is limited to the useful lifetime of each component As there are no electrolytic capacitors used there are no electrical components that limit the...

Page 16: ...pplication Any unit that was used in a process must be properly cleaned in accordance with OSHA standards before it is returned to the factory A Material Safety Data Sheet MSDS must accompany material that was used in any media All shipments returned to the factory must be by prepaid transportation All replacements will be shipped F O B factory ASSURED qUALITy SERVICE COST LESS ANSI ISA 84 00 01 2...

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