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51-650 Model 961/962 Echotel SIL Safety Manual -– Loop Version
Step
Proof Test – Echotel Model 961 Relay
Refer to the Model 961 installation and operation manual and the SIL Safety Manual
(note the charts in section 2.5.1 of the I & O Manual).
1
Bypass the PLC or take other action to avoid a false trip.
2
Inspect the Unit in detail outside and inside for physical damage or evidence of environmental or
process leaks.
a.) Inspect the exterior of the Unit housing. If there is any evidence of physical damage that may
impact the integrity of the housing and the environmental protection, the unit should be repaired
or replaced.
b.) Inspect the interior of the Unit. Any evidence of moisture, from process or environment, is an
indication of housing damage, and the unit should be repaired or replaced.
3
Observe and record the settings of the HI/LOW and INDEPENDENT/JOINT (I/J) DIP switches, the LED
indicators, Relay contact conditions and Sensor GAP condition (WET or DRY).
If the FAULT LED is lighted or the MALF LED is OFF, diagnose the fault and repair or replace the unit.
Confirm proper operation of the unit: WET/DRY GAP condition and WET LED; LEVEL LED and relay
operation.
a.) Press LEVEL TEST push button and confirm Relay Contacts and LEVEL LED change state.
Release the button and unit returns to proper operation based on the GAP condition and switch
settings.
b.) Change HI/LOW DIP switch position. Confirm LED & Relay change state. Observe the time
delay from change of DIP switch until LED and Relay contacts change. Delay is set by Time
Delay Pot, so delay may be as long as 10 seconds. Change HI/LOW DIP switch back to
original setting and confirm proper operation, after the delay.
c.) Press MALF TEST push button and confirm: FAULT LED lights, MALF and WET LEDs goes OFF
and MALF Relay contacts go to the de-energized state. Release button. Confirm unit returns to
normal operation
d.) Adjust the Time Delay Pot to maximum delay, fully clock-wise up to 20 turns. Change HI/LOW
DIP switch position and observe the time delay from change of DIP switch until LED and Relays
change. Confirm delay
≥
10 seconds. Change HI/LOW DIP switch back to original setting and
confirm
≥
10 seconds delay. Adjust the Time Delay Pot to minimum delay, fully counter-clock-
wise ~20 turns. Change HI/LOW DIP switch position and observe the time delay. Confirm delay
≤
1 seconds. Change HI/LOW DIP switch back to original setting and confirm minimum delay.
4
When possible moving the process level will provide a more complete proof test.
Confirm proper operation of the unit: WET/DRY GAP condition, WET LED and relay operation.
a.) Move the process level and confirm the GAP condition has changed. Confirm proper operation
of the unit: WET/DRY GAP condition and corresponding LED and Relay contacts state.
b.) Return process level to original state. Confirm proper operation of the unit: WET/DRY GAP
condition and corresponding LED and Relay contacts state.
c.) If unit fails the tests of steps 4a or 4b proceed to step 5.
d.) Adjust the Time Delay Pot to the original setting. Use HI/LOW DIP switch (as described in step
3b) to confirm that delay is returned to original setting.
e.) Proceed to step 6.
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