Magtech MLS-3, MLS-3Ex Level Switches Manuals & Guides

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Specifications MLS Series

MLS-3

3.0”

½” NPT

6.8 “

Stainless

“Ex” Version

Specifications:

Deadband: .50 Inches (12.7mm)
Max. Temperature: 600°F (316°C)
Min. Temperature: -40°F (-40°C)
Contacts: SPDT or DPDT
Contact Ratings:
Volts AC/DC 150
Amps 1.0 to 10.0 Amp Options
Housing: 316 SS Encapsulated base with
Explosion-proof Condulet
Electrical Class: General Purpose
Class 1, Div. 1, Groups B, C & D
UL, C-UL, CSA & ATEX Listed

Switch Options:
MLS-3 1 amp SPST switch (no housing)

MLS-3Ex explosion-proof with terminal block
MLS-3Ex 2 DPDT option
MLS-5Ex 5 amps, DPDT
MLS-10Ex 10 amps, DPDT
“HT” options for temperatures to 650°F
“NL” Non-latching

MLS-3, MLS-3Ex Level Switches

Specifications & Wiring Diagrams

Specifications MLS Series

3902 Magnolia Rd.

Pearland, Texas 77584

Phone [phone] Fax [phone]

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

ower alarm signals.

Specifications:
Deadband: .50 Inches

Max. Temperature: 650°F (343°C) – HT Version
350°F (177°C) – STD
Version
Min. Temperature: -40°F / °C
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 these steps:

Rising Level Alarm
MLS-3 Yellow Green Red
MLS-3Ex A(NC) C B(NO)
Falling Level Alarm

MLS-3 Red Green Yellow

MLS-3Ex B(NC) C A(NO)

Wiring Details:

The wire leads on the MLS-3 should be terminated using suitable
means (wire nuts, terminal block, etc.). The MLS-3Ex are
provided with a terminal block inside the explosion-proof
enclosure.

fter the switches are mounted and wired, th ey need to be
set to the desired state for rising or falling level as noted
previously. This is easily accomplished by either manually
pushing the float or magnet past the highes t s witch, or filling
the gage chamber with fluid until all switches are properly
set.

Schematic: MLS-3 / MLS-3Ex
Yellow A

Red B

Green C

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MLS-5Ex, MLS-10Ex-R, PS-2 / PS-2H

Level Switches

Specifications & Wiring Diagrams

3902 Magnolia Rd.

Pearland, Texas 77584

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MLS-5Ex and 10Ex Series Level Switches NOTE: These switches require power.

Description: The MLS-5Ex and MLS-10Ex-R switches come in explosion-proof housing (same as MLS-3Ex) with terminals and
hermetically sealed relays rated for 5 and 10 Amp, 2 Form C, DPDT contacts. The relay is actuated by the float and latches, t hus
maintaining the contact after the float continues to rise or fall with the level. These are best suited for alarm signals or pumps.

MLS-5Ex Specifications:

Deadband: .50” (12.7mm)
Max. Temperature: 650°F (343°C) – HT Version
350°F (176°C) – STD Version
Min. Temperature: -40°F (-40°C)
Contacts: Form C DPDT
Maximum Ratings:
Switching Voltage: 240V/30V AC/DC
Current: 5 Amps
Power: 1KVA/150W
Contact Ratings:
5A @ 240VAC resistive 1.5A @ 240VAC inductive (cosec=0.4)
5A @ 120VAC resistive 1.5A @ 120VAC inductive (cosec=0.4)
5A @ 30VDC resistive 1.5A @ 24VDC inductive (L/R=7msec)
1/8HP @ 250VAC

Power Options

- 12 VDC

- 24 VDC

- 110 VAC

- 220 VAC

Neutral

Load 1

Hot

Load 2 (NC)
Load 2 (NO)
Line 2
Load 1 (NC)
Load 1 (NO)

Line 1

Line Ret

MLS-10Ex-R Specifications:

Deadband: .50 Inches
Max. Temperature: 650°F (343°C) – HT Version
350°F (176°C) – STD Version
Min. Temperature: -40°F (-40°C)
Contacts: Form C DPDT
Maximum Ratings:
Switching Voltage: 240V/30V AC/DC
Current: 10 Amps
Power: 2KVA/300W
Contact Ratings:
10A @ 240VAC resistive 8A @ 240VAC inductive (cosec=0.4)
10A @ 120VAC resistive 8A @ 120VAC inductive (cosec=0.4)
10A @ 30VDC resistive 8A @ 24VDC inductive (L/R=7msec)
1/8HP @ 250VAC

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Magtech Level Switch

PS-2 / PS-2H Level Switches

Description: The PS-2 is a pneumatic switch designed to control air and natural gas from 15 to 100 psi. The PS-2 is rotary cam
activated and incorporates a non-bleed switch. When the float passes, the cam rotates and latches the switch in the open position. This
will allow unobstructed airflow. When the float moves back in the opposite direction the switch unlatches and blocks the airflow. The no­bleed design of the PS-2 makes it ideal for controlling applications requiring natural gas. The PS-2 can also be used to control
pneumatic alarms, pumps and valves.

PS-2 / PS-2H Specifications:

Deadband: 0.7” (17.78 mm)
Max. Temperature: 300°F / 450°F (148°C / 232°C)
Min. Temperature: 0°F
Supply Pressure @ 70°F 15 – 100 psi (1.03 – 6.89 bar)
Supply Pressure @ 300°F 15 – 35 psi / 15 - 60 psi
(Dry, Filtered air or gas) (1.03 – 2.41 bar / 1.03 – 4.41 bar)
Housing 316SS, Nema 4

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