962-7DA1-135 datasheet(13/36 Pages) MAGNETROL

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51-646 Echotel® Model 961 & 962 Ultrasonic Level Switches

TIME

DELAY

LEVEL

TEST

MALF

TEST

MALF RELAY

FAULT

WET

LEVEL

MALF

MODEL 961

High/Low

DIP Switch

Independent/Joint

DIP Switch

Level Test

Pushbutton

Malfunction Test

Pushbutton

Hi I

Lo J

Time Delay Pot

to decrease delay

to increase delay

Turn

Figure 14

Model 961 Line Power Configuration

2.5.1.1 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 clockwise

to increase the response time from the standard 0.5 seconds

to a maximum of 45 seconds. Turning the pot counter-

clockwise decreases the time delay.

The WET LED is not influenced by the time delay pot.

As an example, turning the pot clockwise several turns will

put a time delay into the 961. Immersing the tip of the

transducer in water with the Hi/Lo switch in the Hi posi-

tion, will produce the following results:

• WET LED will immediately turn on

• After the time delay the LEVEL LED will turn off and the

DPDT process level relay will de-energize

When removing the tip of the transducer from the water

the WET LED will immediately turn off. After the time

delay the LEVEL LED will turn on and DPDT process

level relay will energize.

2.5.1.2 Level Test Push Button

The level test push button is used to manually test the

DPDT process level relay. Pressing this push button reverses

the state of the DPDT relay, from energized to de-ener-

gized or vice-versa. 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 level test

push button.

2.5.1.3 Malfunction Test Push Button

The malfunction test push button is used to manually test

the SPDT malfunction relay. Pressing and holding this

push button for 2 seconds will cause the SPDT relay 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 green MALF (malfunc-

tion) LED is on to indicate that the malfunction relay is ener-

gized, and the red FAULT LED is off to indicate that there are

no faults. Should a fault condition occur, the red FAULT LED

turns on and the green MALF LED turns off, indicating that the

malfunction relay is de-energized.

Operating

Condition

Red

Fault LED

Green

Malfunction LED

Normal

Off

Fault

Off

Fault and Malfunction LED Indication

962-7DA1-135 Datasheet(PDF) 13 Page - Magnetrol International, Inc.

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