LS200, LS200N, LS200NDVOR Series and L1100 Liquid Level Switches Installation and Operations Manual 00-02-0563 01-11-06 Section 15
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time. The latest version of this manual can be found at www.fwmurphy.com. Warranty - A limited warranty on materials and workmanship for one year is given with this FW Murphy product. A copy of the warranty may be viewed or printed by going to www.fwmurphy.com/support/warranty.
Table of Contents Product Information................................................................................................................ 1 Features .......................................................................................................................1 LS200...........................................................................................................................1 LS200NDVOR..........................................................................................
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Product Information Features • Designed for harsh gas compressor scrubber applications • 304 stainless steel float operates in 0.5 specific gravity and heavier fluids • LS200 series rated for 2000 psi (13.
LS200NDVOR LS200NDVOR is a float-activated, pneumatic-vent level device used to operate dump valves or similar devices. The LS200NDVOR provides a 2” NPT mounting with a pneumatic snap action output for interfacing with pneumatic devices such as our Murphy pneumatic dump valve or with other pneumatic instrumentation. Pneumatic media devices require clean, dry, instrument quality air or gas.
LS200NDVO Pneumatic level switch with snap action Dump Valve Operator (DVO) without the pressure regulator for those applications where the system provides a filter regulator for “instrument quality” air or gas as the control medium. LS200NDVO pneumatic level switch with dump valve operator LS200N Pneumatic level switch without the DVO and filter regulator.
Pressure Vessel Installation: LS200, LS200N and L1100 Direct Installation into the Wall of the Pressure Vessel 1. Determine that the float travel is not obstructed by the coupling in the vessel wall, internal baffles, etc. Do NOT use more than one float shaft extension P/N 15000478. 2. Make certain the float and extension are tight. 3. Before installing the level switch, use of a pipe thread sealant is recommended. Screw the unit directly into the threaded connection in the wall of the pressure vessel.
Installation Using Murphy External Float Chamber 1. Install the Murphy float chamber 15051098 or 15051168 on the outside wall of the pressure vessel using 1” NPT piping or use the mounting surface with a bracket. Position the 2” NPT threaded connection at the height where you want the level switch to operate. The 2” NPT threaded connection must be positioned away from the tank wall. 2.
3. Valve seat adjustment can be made if air/gas begins to leak. Care should be taken when adjusting as only slight movement is necessary to stop the leakage; excessive force will bind the seating mechanism. See the instruction below for adjustment. CAUTION: Avoid excessive Teflon tape which may inhibit proper operation. Trip Cam Operating Lever Orientation The LS200 series level switches are shipped with the trip cam orientation set for normal operation, or vent on rising level.
Replacing and Installing the DVO Assembly NOTE: When replacing/installing the DVO assembly, tubing and fitting modifications may be required. We suggest removing the LS200NDVO/DVOR from the vessel. Relieve pressure from the vessel or use block valves before removing the LS200NDVO/DVOR. Models LS200NDVO & LS200NDVOR NOTE: Clean, dry instrument-quality gas should be used. Use and regular maintenance of filters will improve service life and reliability.
Instructions 1. Block off and bleed the instrument gas pressure supply to the LS200NDVO/DVOR. 2. Remove the tubing between the LS200NDVO/DVOR and the scrubber dump valve, and remove the supply gas tubing (regulator [-R-] if used). 3. Remove the LS200NDVO/DVOR from the vessel (optional). 4. If the LS200NDVO/DVOR was removed from the vessel, mount it in a suitable vise on a work bench (if possible). 5. Using the proper tools, disconnect the Inlet, Outlet, and Exhaust fittings from the existing DVO.
CAUTION: Ensure that the actuator arm is not bent during reassembly. 10. With the DVO aligned over the hex on the LS200NDVO body, tighten the valve using the 9/16” hex wrench. You may need to hold the DVO while tightening to keep it from rotating. 11. The pneumatic input signal should be regulated between 30 and 70 psi for proper setting of the adjustable orifice. With the float in the down position adjust the adjustable orifice down until it touches the seat. See Figure 4.
Electrical Replacement Parts CAUTION: LS200 Series parts are not interchangeable with other Murphy liquid level products. Damage caused by the above mentioned is not covered by our Limited Warranty. Order by part number designation.
L1100 15000893: 15000937: 15000124: 15000892: BUOYGLAS™ float Stainless steel float SPDT snaps switch assembly Float shaft extension Accessories 15050375: Weld Collar Operating Pressure: 2000 psi (13.8 MPa) [138 bar]. Operating Temperature: 400°F (204°C).
15051098: External Float Chamber Operating pressure: 2000 psi (13.8 MPa) [138 bar] Operating temperature: 400°F (204°C). 15051168: CB External Float Chamber Operating pressure: 2000 psi (13.8 MPa) [138 bar] Operating temperature: 400°F (204°C).
15000478: Float Shaft Extension CAUTION: For use on LS200 only. Not interchangeable with L1200 parts.
Specifications All Models • Body: Nickel plated steel; optional 316 stainless steel (meets NACE standard MR-01-75 for direct exposure to H2S service) • Float: 304 stainless steel to operate in 0.5 specific gravity or heavier fluids (LS200 Series models only) • Pressure rating: 2000 psig (13.8 MPa) [138 bar] (LS200 models only) • O-ring: Viton LS200 • Process connection: 2” NPT • Temperature rating: -20 to 300°F (-29 to 149°C) • Electrical: SPDT std. (see “Electrical” section for configuration/rating.
MURPHY, the Murphy logo, and Liquid level Switches (LS) are registered and/or common law trademarks of Murphy Industries, Inc. This document, including textual matter and illustrations, is copyright protected by Murphy Industries, Inc., with all rights reserved. (c) 2005 Murphy Industries, Inc. Other third party product or trade names referenced herein are the property of their respective owners and are used for identification purposes only.
