Babbitt Liquid Level Gauge - Manual (Page 8)

MLS-3, MLS-3EX LEVEL SWITCHES
DESCRIPTION
The MLS-3 and MLS-3EX are electrically the same, the EX version comes with an explosion proof
housing with terminal block. The MLS-3 switch is a hermetically sealed Bi-Stable latching reed
switch with SPDT Form C contacts. The switch is actuated by the float and latches, thus
maintaining the contact after the float continues to rise or fall with level. The MLS-3 is best suited
for low power alarm signals.
SPECIFICATIONS
Deadband: .50 Inches
Max. Temperature: 650°F – HT Version
350°F – STD Version
Min. Temperature: -40°F
Contacts: Form C SPDT
Maximum Ratings:
Switching Voltage: 150 Volts AC/DC
Current: 1.0 Amps AC/DC
Power: 25 Watts DC/VA
SWITCH OPERATION/MOUNTING
To mount the MLS Series Level Switch simply clamp it directly to the side of the level gage
chamber using the adjustable pipe clamps provided. Alarm set points may be changed by simply
loosening the clamps and sliding the switch to the desired alarm level. To set up desired starting
state follow the steps below:
WIRING DETAILS
RISING LEVEL ALARM
MLS-3 Yellow Green Red Green
MLS-3EX A(NC) C B(NO) C
FALLING LEVEL ALARM
MLS-3 Red Green Yellow Green
MLS-3EX B(NC) C A(NO) C