961-20A0-010 Datasheet, PDF (17/36 Pages) Magnetrol International, Inc. – Ultrasonic Single and Dual Point Level Switches

2.5.3 Model 962 Line-powered Configuration
Model 962 line-powered units have the following configu-
ration options:
• TIME DELAY potentiometer for 0.5 to 45 second signal
averaging
NC C NO NC C NO NC C NO L1
L2
MALF RELAY
LOWER
UPPER
MALF
TEST
MALF UPPER
FAULT LOWER
Hi PC
Lo LC
MODEL 962
TIME
DELAY
LEVEL
TEST
• LEVEL TEST push button for testing of the SPDT
process level relays
• MALF TEST push button for testing of the SPDT mal-
function relay
• Hi/Lo DIP switch for fail-safe high or low level selection
• PC/LC DIP switch for level control or pump control
Level Test
Push Button
operation
High/Low
DIP Switch
Malfunction Test
Push Button
Time Delay Pot
2.5.3.1 Time Delay Potentiometer
The time delay potentiometer is typically used in applica-
Pump Control/Level Control
DIP Switch
Turn
to increase delay
tions where turbulence or splashing may cause false level
alarms. This is a 25-turn pot with a factory default setting
Turn
to decrease delay
of 0.5 seconds. If desired, this pot may be turned clock-
wise to increase the response time from the standard 0.5
Figure 16
seconds to a maximum of 45 seconds. Turning the pot
Model 962 Line Power Configuration
counterclockwise decreases the time delay.
2.5.3.2 Level Test Push Button
The LEVEL TEST push button is used to manually test
both of the SPDT process level relays. Pressing this push
button reverses the state of both SPDT process level relays,
from energized to de-energized or vice-versa. This can be
used to manually test these relays, and whatever is con-
nected to them. The time delay pot does not affect the
operation of the LEVEL TEST push button.
Fault and Malfunction LED Indication
Operating
Red
Green
Condition Fault LED Malfunction LED
Normal
Off
On
Fault
On
Off
2.5.3.3 Malfunction Test Push Button
The MALF TEST push button is used to manually test
the SPDT malfunction relay. Pressing and holding this
push button for 2 seconds will cause all three relays to
de-energize, indicating a fault condition. This can be used
to manually test the relay, and whatever is connected to
this relay. The time delay pot does not affect the operation
of the malfunction push button.
NOTE: Under normal operating conditions the red fault LED is off and
the green malfunction LED is on, indicating that the
malfunction relay is energized. Should a fault condition occur,
the red fault LED turns on and the green malfunction LED
turns off, indicating that the malfunction relay is de-energized.
51-646 Echotel^® Model 961 & 962 Ultrasonic Level Switches
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