5.8.1 Diagnostics

Model 961/962 has a unique diagnostics feature to assist in

troubleshooting should a failure occur. A microprocessor in

the electronics continuously monitors all self-test data.

Should a fault occur, the microprocessor can determine

whether the malfunction is due to the electronics, transducer,

piezoelectric crystals, or the presence of environmental noise.

Table 4 shows the push buttons and LEDs used for each

version of the 961/962 for diagnostic troubleshooting:

5.8.2 Troubleshooting

Model 961/962 has a diagnostic push button and Fault LED

used to assist in troubleshooting the switch (see Table 5).

Refer to Section 3.7 of the Echotel Ultrasonic Single and

Dual Point Level Switches Installation and Operating Manual

(Bulletin 51.646) for troubleshooting device errors.

11

51-650 Echotel SIL Safety Manual

Table 4

Diagnostic Push Buttons and LED Indications

Electronics Version

Push Button

LED

961 with 5 amp relays

LEVEL 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 respective terminal

blocks. Make sure that all the

terminal block screws are fully

tightened. If all wires are secure

then contact the factory. Replace

transducer if needed. Refer to

Section 3.8 of the Installation and

Operating Manual for proper

replacement part numbers.

2 flashes

Indicates a problem with one of

the electronics boards.

Contact the factory for a replace-

ment electronics module. Refer

Section 3.8 of the Installation and

Operating Manual for spare elec-

tronics modules part numbers.

3 flashes

Indicates excessive levels of

environmental noise.

Check if any source may be caus-

ing the interference, such as VFD

(variable frequency drive), radiated

electrical interference (two-way

radio transceiver) or mechanical

vibration from nearby source.