961-20A0-010 Datasheet, PDF (18/36 Pages) Magnetrol International, Inc. – Ultrasonic Single and Dual Point Level Switches

2.5.3.4 High/Low DIP Switch
The Hi/Lo DIP switch is used to select whether the 962
will be used as a high level fail-safe (HLFS) switch or low
level fail-safe (LLFS) switch. The setting of the Hi/Lo DIP
also affects how the PC/LC DIP switch configures the
unit. Read Section 2.5.3.5 below and then proceed to the
appropriate table in Section 2.5.3.6 or 2.5.3.7 for proper
setting of the DIP switches.
2.5.3.5 PC/LC DIP Switch
The PC/LC DIP switch is used to select whether the 962
will operate in a pump control or a level control mode.
Select LC to use the 962 as a level controller where the
relays operate independently of each other. Select PC to
operate the 962 as a pump controller where the relays latch
to enable an auto fill or auto empty mode.
The configuration tables (Section 2.5.3.6 & 2.5.3.7) are
used for proper setting of the Hi/Lo and PC/LC DIP
switches. They also indicate the status of the yellow
LOWER and UPPER LEDs. The green MALF (malfunc-
tion) LED and the red FAULT LEDs are not included in
these tables.
2.5.3.6 LC and Hi/Lo DIP Switch Configuration Table
Level Control (DIP switch set to LC)
Level Hi/Lo DIP
Condition Switch
Lower Gap
Relay
LED
Hi
energized On
Upper Gap
Relay
LED
energized On
Lo de-energized Off de-energized Off
Hi de-energized Off energized On
Lo
energized On de-energized Off
Hi de-energized Off de-energized Off
Lo
energized On energized On
NOTE: During a fault condition all three relays de-energize
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51-646 Echotel^® Model 961 & 962 Ultrasonic Level Switches