MLS Series - FW Murphy Production ControlsFW Murphy Production Controls

Liquid Level Switches

Available with or without the test button, the MLS Series is available in both 1 1/2 inch and 2-inch NPT models. These connect directly into the gas scrubber wall and can be used with an FW Murphy weld collar or FW Murphy external float chamber.

Clean magnet design virtually eliminates iron filing accumulation on the magnet
Seal-free construction
ANSI/ISA 12.27.01 compliant (Single Seal)
Operates in 0.50 specific gravity or heavier fluids
304 cast equivalent SS body and 304 SS float
Trip on rising and falling without need to rotate body
Electric model only available

FW Murphy Production Controls offers support for all our products. If you are unable to find the product that you need, please call us at 918-957-1000.

MLS Series Liquid Level Switches are float activated to operate an electrical SPDT reed switch for annunciation/pilot signal for indication of high level to an annunciator, controller or PLC. The MLS connects directly into the gas scrubber wall and can be used with an FW Murphy weld collar or FW Murphy external float chamber. The MLS Series is available in both 1-1/2 and 2 in. NPT models and with or without the test button.

The test button tests for float function; the complete mechanism including the magnetic activation of the reed switch; and the wiring from the switch to the control panel.

The MLS is designed for harsh gas compressor scrubber applications.
NOTE: Not recommended for hydrogen gas applications.

Rated for 2000 psi (13.8 MPa) [138 bar] working pressure.
NOTE: DO NOT OVERPRESSURE. The stainless-steel float may be deformed if exposed to pressure beyond rated (2000 psi).
This can affect specific gravity and overall operation.

Process Connection: 2 in. NPT (MLS-020); 1-1/2 in. NPT (MLS-015)
Fluid Density (SG):
- 0.50 MIN (no extension)
- 0.65 MIN (1 in. extension)
Pressure Rating: *2000 psig (13.8 MPa) [138 bar]
Body: ASTM A351 CF8 (304 SS)
Cover: ASTM A351 CF8 (304 SS)
Other Wetted Parts: 303, 304 and 316 SS
Process Temperature: -20° to 300° F (-29° to 149° C)
Electrical: 30VAC/VDC 75mA Form C SPDT
- Conductor cross section AWG/kcmil min.: 26
- Conductor cross section AWG/kcmil max.: 16
Certification: CSA C/US Class 1, Div. 1, Grp B, C & D
- Canadian Registration Number: 0F12013.2 C (all provinces and territories) CSA approved

*NOTE: DO NOT OVERPRESSURE. The stainless-steel float may be deformed if exposed to pressure beyond rated (2000 psi).
This can affect specific gravity and overall operation.

MLS Series is not recommended for hydrogen gas applications.