8
51-650 Model 961/962 Echotel SIL Safety Manual
5.5.3 Malfunction Test Push Button
The malfunction test push button is used to manually test
the SPDT malfunction relay and whatever is connected to
the relay. Pressing and holding this push button for 2 seconds
causes the SPDT relay to de-engage, indicating a fault
condition. The malfunction test push button is an option
for both the Model 961 and Model 962 in line-powered
configuration only.
5.5.4 High/Low DIP Switch
The Hi/Lo DIP switch is used to select whether the switch
is used as a high-level fail-safe or a low-level fail-safe switch.
See Section 2.5 of the
Echotel Model 961/962 Ultrasonic
Level Switches Installation and Operating Manual
(Bulletin
51-646) for high/low DIP switch configuration tables.
5.5.5 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 relays will de-engage
when a fault is detected. The I/J DIP switch is an option for
the Model 961 in line-powered configuration only.
5.5.6 Loop Test Push Button
The loop test push button is used to manually test the loop
current output. For Model 961, pressing the loop test push
button reverses the output from 8 mA to 16 mA or from
16 mA to 8 mA. For Model 962, pressing the loop test push
button changes the output from 8 mA to 12 mA, 12 mA to
16 mA, or 16 mA to 8 mA.
5.5.7 Fault Test Push Button
The fault test push button is used to manually change the
mA values to that selected at the 22/3.6 DIP switch.
Pressing this push button for two seconds simulates a circuit
test failure. The output goes to the selected fault current of
either 22 or 3.6 mA, and all three LEDs go dark. The fault
test push button is an option on both Model 961 and
Model 962.
5.5.8 22/3.6 DIP Switch
The 22/3.6 switch is used to produce a 22 mA or 3.6 mA
output when the unit detects a fault. The 22/3.6 switch is
on both the Model 961 and Model 962.
