961-20A0-010 Datasheet, PDF (20/36 Pages) Magnetrol International, Inc. – Ultrasonic Single and Dual Point Level Switches

Hi 22
Lo 3.6
FAULT
TEST
MODEL 962
LOOP
TEST
TIME
DELAY
8 12 16
–+
2.5.4 Model 962 Loop-powered Configuration
Model 962 loop-powered units have the following config-
uration options:
• TIME DELAY potentiometer for 0.5 to 45 second signal
averaging
• LOOP TEST push button for testing the 8/12/16 mA
loop output
• FAULT TEST push button for testing the 3.6 or 22 mA
fault output
• Hi/Lo DIP switch for fail-safe high or low level selection
• 22/3.6 DIP switch to select the fault mA current output
High/Low
DIP Switch
Fault Test
Push Button
Loop Test
Push Button
Time Delay Pot
22/3.6 mA
DIP Switch
Turn
Turn
to increase delay
to decrease delay
Figure 17
Model 962 Loop Power Configuration
2.5.4.1 Time Delay Potentiometer
The time delay potentiometer is typically used in applica-
tions where turbulence or splashing may cause false level
alarms. This is a 25-turn pot with a factory default setting
of 0.5 seconds. If desired, this pot may be turned clock-
wise to increase the response time from the standard 0.5
seconds to a maximum of 45 seconds. Turning the pot
counterclockwise decreases the time delay.
2.5.4.2 Loop Test Push Button
The loop test push button is used to manually test the
loop current output. Pressing the LOOP TEST push but-
ton will force the output from 8 mA to 12 mA, 12 mA to
16 mA, or 16 mA to 8 mA. This can be used to manually
test the loop output and whatever is connected to the 962.
The time delay pot does not affect the operation of the
loop test push button.
2.5.4.3 Fault Test Push Button
The FAULT TEST push button is used to manually force
the 962 to the mA value that is selected at the 22/3.6 DIP
switch. Pressing this push button for 2 seconds will simu-
late a circuit test failure. This causes the output to go to
the selected fault current of either 22 or 3.6 mA, and all 3
LEDs will go dark. The time delay pot does not affect the
operation of the FAULT TEST push button.
NOTE: Fault current will be greater than 21 mA, or less than 3.6 mA.
20
51-646 Echotel^® Model 961 & 962 Ultrasonic Level Switches