17
51-650 Model 961/962 Echotel SIL Safety Manual -– Loop Version
Step
Proof Test – Echotel Model 962 Relay
Refer to the Model 962 installation and operation manual and the SIL Safety Manual
(note the charts in section 2.5.3 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 PUMP CONTROL/LEVEL CONTROL (PC/LC) 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 for each GAP; UPPER LED and relay
operation; and LOWER LED and relay operation.
a.) Press LEVEL TEST push button and confirm both UPPER and LOWER Relay Contacts change
state, and LEDs also change. 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 LEDs & Relays change state. Observe the time
delay from change of DIP switch until LEDs 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 origi-
nal setting and confirm proper operation, after the delay.
c.) Press MALF TEST push button and confirm: FAULT LED lights, All other LEDs goes OFF, and
all 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 set-
ting 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 for each GAP; UPPER LED and relay
operation; and LOWER 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.
Continue to move process level in order to test three possible states; 1. Both GAPS DRY
2. One GAP WET 3. BOTH GAPS WET.
b.) Change the PUMP CONTROL / LEVEL CONTROL (PC/LC) DIP switch position. Repeat the test
of step 4a to test all three possible GAP states and confirm expected operation. Return the
PC/LC DIP to the original position.
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
2e) to confirm that delay is returned to original setting.
e.) Proceed to step 6.
continued on next page
