PLT Mag-gage User manual

Process Level Technology, Ltd.
MAG-GAGE®IOM
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
888 CLEAR CREEK AVE LEAGUE CITY, TEXAS 77573
Phone # (281) 332-MAG1(6241)
Fax # [phone]
WWW.MAG-GAGE.COM
PLT MAG-GAGE Revision 06

Process Level Technology, Ltd.
MAG-GAGE®
OPS-001 Revision 6Page 2of 30 December 17, 2018
Process Level Technology, Ltd.
Installation, Operation and Maintenance Instructions
Contents
Section 2.1.0. Magnetic Level Gages
“MAG-GAGE®”
2.1.0. Description
2.1.1. Introduction
2.1.2. Components
2.1.3. Chamber Material
2.1.4. Internal Float
2.1.5. Float Submergence
2.1.6. Gage ratings
2.1.7. Hydrostatic Testing
2.2.0. Level Indication
2.2.1. Introduction
2.2.2. Single Indication (SI)
2.2.3. Single Indication - Reference Guide
2.2.4. Flag/Flipper Indication (FL)
2.2.5. Flag/Flipper Indication - Reference Guide
2.2.6. Flag /Flipper Indication - Retrofit
2.3.0. Installation
2.3.1. Inspection
2.3.2. Chamber Orientation
2.3.3. Connection Valves
2.3.4. Float Orientation
2.3.5. Chamber Gaskets
2.3.6. Flanges and Connections
2.3.7. Interface Applications
2.4.0. Operation
2.4.1. Introduction
2.4.2. Procedures/Storage
2.5.0. Removal From Service
2.5.1. Introduction
2.5.2. Procedures

Process Level Technology, Ltd.
MAG-GAGE®
OPS-001 Revision 6Page 3of 30 December 17, 2018
Process Level Technology, Ltd.
Installation, Operation and Maintenance Instructions
Contents
Section 2.0.0. Magnetic Level Gages (cont.)
2.6.0. Maintenance
2.6.1. Introduction
2.6.2. Procedures
2.7.0. Troubleshooting
2.7.1. Introduction
2.7.2. Float & Indicator Detachment
2.7.3. Differential Level
2.7.4. Defective Indicator
2.7.5. Switch Malfunctioning
2.8.0. Parts List
2.8.1. Introduction
2.8.2. Chamber
2.8.3. Indicator & Scale Assembly
2.9.0. Warranty
2.9.1. Introduction
2.9.2. Conditions
2.9.3. Provisions
2.10.0. Terms and Condition of Sale
2.10.1. Introduction
2.10.2. Terms
2.10.3. Shipment
2.10.4. Restocking
2.10.5. Cancellation

Process Level Technology, Ltd.
MAG-GAGE®
OPS-001 Revision 6Page 4of 30 December 17, 2018
Process Level Technology, Ltd.
Installation, Operation and Maintenance Instructions
Contents
Section 3.0.0. Pneumatic Level Control
3.1.0. Non Bleed, Block & Bleed Switches – MGS-100
3.1.1. Introduction
3.1.2. Operating Specifications
3.1.3. Installation Procedures
3.1.4. Operation & Maintenance
3.2.0. Pneumatic Level Controller - LCP
3.2.1. Introduction
3.3.2. Operation
Section 4.0.0. Electronic Level Control
4.1.0. Electric Switches – MGS200EX (/2)
4.1.1. Introduction
4.1.2. Specifications
4.1.3. Mounting
4.1.4. Operation
4.1.5. Electrical Wiring - Rising Level
4.1.6. Electrical Wiring - Falling Level
4.2.0. Electric Switches - MGS500EX (/2)
4.2.1. Introduction
4.2.2. Specifications
4.2.3. Mounting
4.2.4. Operation
4.2.5. Electrical Wiring-Raising Level
4.2.6. Electrical wiring-Falling Level

Process Level Technology, Ltd.
MAG-GAGE®
OPS-001 Revision 6Page 5of 30 December 17, 2018
4.3.0. Electric Switches – MGS700EX(/2) MGS-900EX(/2)
4.3.1. Introduction
4.3.2. Specification
4.3.3. Mounting
4.3.4. Operation
4.3.5. Electrical Wiring-Rising Level
4.3.6. Electrical Wiring-Falling Level

Process Level Technology, Ltd.
MAG-GAGE®
OPS-001 Revision 6Page 6of 30 December 17, 2018
Magnetic Level Gages
Installation, Operation and Maintenance Instructions
Section 2.1.0. - Description
2.1.1. INTRODUCTION
Process Level Technology, Ltd magnetic level gages (MAG-GAGE®) are an indirect reading liquid level
indicator. The magnetic level gage series utilize non-magnetic 2.00-inch, schedule 40 chambers (standard)
manufactured to length specifications with process connections that match those of the vessel or tank. For some
high pressure, low gravity applications, a 3.00-inch schedule 40 chamber is available. The process connections
may be:
1. Side mounted, threaded, flanged or socket welded
2. Top and bottom flanged mounted
3. Tank top mounted
4. Combination
A variety of mounting styles is available to suit any vessel or piping requirements. Refer to the drawing depicting
magnetic level gage mounting configurations.
2.1.2. COMPONENTS
The gage chamber contains a magnetic float and is completely isolated from the indicator housing attached to the
outside of the gage chamber. External indicators consist of a single yellow or continuous flag/flipper models. The
magnetic float maintains a magnetic bond with the external level indicator. As the level of the process medium
fluctuates within the tank and gage chamber, the float reacts accordingly with the indicator recording the level of
the fluid within the chamber.
2.1.3. CHAMBER MATERIAL
Gages are manufactured to meet exact specifications of the process media such as operating pressure, temperature,
specific gravity, etc. Standard chamber materials are 316/304 stainless steel however any non-magnetic material
may be used. Other chamber materials that are available include CPVC, Kynar, Hastelloy, Alloy 20, Zirconium,
Monel, Etc.

Process Level Technology, Ltd.
MAG-GAGE®
OPS-001 Revision 6Page 7of 30 December 17, 2018
.
Magnetic Level Gages
Installation, Operation and Maintenance Instructions
Section 2.1.0. – Description
2.1.4. INTERNAL FLOAT
A magnetized float is contained inside the float chamber and is designed to the requirements of the process
conditions. For this reason floats are not interchangeable unless the process conditions and gage chambers are
identical. The float moves freely inside the chamber reacting to fluctuating level changes within the adjoining
vessel.
2.1.5. FLOAT SUBMERGENCE
Under normal operating conditions, the float should be submerged about 80% or more in the process fluid. It is
important to note, however, that the position of the float in the media will vary with different process conditions.
Float magnets are located in the upper portion of the float.
2.1.6. GAGE RATINGS
Magnetic level gages can be designed for operating conditions from full vacuum service up to 5000 PSIG, 1100
degrees F, and a minimum gravities of 0.20. All magnetic gages with alloy chambers will have full ANSI ratings
based on flange classifications. Gages with CPVC, Kynar (PVDF) or Fiberglass shields will have 150 PSIG
ratings only.
2.1.7. HYDROSTATIC TESTING
Gage chambers are hydrostatically tested to 150% of indicated gage rating without floats installed. Floats are
tested individually. Gages can be field hydrostatically tested after installation at the operator's discretion.
CAUTION: Do not conduct hydrostatic testing of the magnetic gage chamber attached to a
process vessel with the float installed. If a gage is field tested with the float installed, the float
may crush and chamber may become damaged. This procedure will void the warranty.

Process Level Technology, Ltd.
MAG-GAGE®
OPS-001 Revision 6Page 8of 30 December 17, 2018
Magnetic Level Gages
Installation, Operation and Maintenance Instructions
Section 2.2.0. - Level Indication
2.2.1. INTRODUCTION
There are two types of external level indication options offered by Process Level Technology, Ltd. for magnetic
level gages. The single indicator (ST)/(SST) is recommended for stagnant storage level applications with little or
no level fluctuations. The wide flag indicator (WF)(SWF) is recommended for turbulent or high vibration level
conditions.
2.2.2. SINGLE TRACKER INDICATION (ST or SST)
The single follower assembly used for indicating level consists of a rectangular yellow magnetic follower sealed
in a channel with a 316 stainless steel calibration scale marked in feet and inches, total inches or in centimeters.
The indicator is mounted parallel and immediately adjacent to the gage chamber to allow maximum magnetic
coupling between the float and the follower within the indicator channel. The indicator is sealed to prevent dirt
and moisture accumulation. A red bumper is positioned at the bottom of the channel to cushion the impact of the
follower against the cover. Although the yellow follower provides maximum visibility even at nighttime, retrofit
kits for illuminating gages are available.
2.2.3. SINGLE TRACKER INDICATION - REFERENCE GUIDE
A black reference guide in the center of the yellow follower allows the operator to match the graduated scale with
the level of the process fluid. A nameplate at the lower end of the scale provides zero level indication. If the
yellow follower is decoupled from the internal float's magnetic field, the follower will descend below the zero
point on the scale. Thus, when the vessel is empty, the level gage will read zero and the yellow follower will
remain visible. To prevent the float from losing magnetic coupling with the follower, a spring is mounted inside
the top and bottom of the gage chamber. This cushion the impact of the float against the chamber ends when the
vessel is completely full or empty. The float and the follower are magnetically coupled when the follower remains
visible. If the magnetic coupling is lost between the float and follower, use a hand magnet to attract the follower
until it is contained within the float's magnetic field. Refer to the Troubleshooting portion of the manual, Section,
2.7.2.

Process Level Technology, Ltd.
MAG-GAGE®
OPS-001 Revision 6Page 9of 30 December 17, 2018
Magnetic Level Gages
Installation, Operation and Maintenance Instructions
Section 2.2.0. - Level Indication (cont.)
2.2.4. WIDE FLAG/FLIPPER INDICTION (WF),(SWF)
Process Level Technology offers a continuous Wide Flag or Flipper style indicator as an option to the Single
Yellow Follower indicator. Flag indications are industrial grade level indicators which consist of a series of
ceramic flags, black on one side, yellow on the other. As the magnetic float reacts to level fluctuations, each flag
or flipper will rotate 180 degrees to reveal the opposite color.
Process Level Technology, Ltd. a flipper is housed in a rugged sealed housing with a recessed glass window and
rotates on a ceramic and stainless steel surface. This eliminates the flippers from sticking or hanging up. The
unique design prevents all flippers from rotating in excess of 180 degrees and each flag is magnetically locked to
the next. Wide Flag indicators are recommended where surging or turbulent level conditions exist. Each flag
indicator is 1.40 inches wide and is more visible than the standard single indicator. These are available with or
without scales up to 20 ft.
2.2.5. WIDE FLAG/FLIPPER INDICATION - REFERENCE GUIDE
Yellowrepresents liquid column, Black represents vapor space.
2.2.6. WIDE FLAG/FLIPPER INDICATION - RETROFIT
When flipper style indicators are purchased with a Process Level Technology, Ltd. magnetic level gage, no
installation is necessary. If the indicator is removed or a retrofit kit is purchased for a gage already in service,
however, the following steps should be noted:
1. The mounting clamps connecting the flipper assembly to the gage chamber are adjustable to most
manufacturers' standard, (i.e. 1.50 inch to 2.50-inch pipe). If the gage is in service and there is liquid in the
tank, only the flippers adjacent to the float will rotate to yellow when the indicator assembly is clamped on.
2. Run a magnet along the window of the indicator from zero to where yellow is showing as noted, or
3. Drain the gage to zero on the indicator, and then fill again. As the float rises, the level indicator will react
accordingly and will be reset properly.

Process Level Technology, Ltd.
MAG-GAGE®
OPS-001 Revision 6Page 10 of 30 December 17, 2018
Magnetic Level Gages
Installation, Operation and Maintenance Instructions
Section 2.3.0. - Installation
2.3.1. INSPECTION
All magnetic level indicators are securely packed in crates to provide maximum protection of the equipment
during shipment. It is important to unpack and inspect each gage upon receipt to insure the indicator and chamber
were not damaged in shipment. If you should find damaged parts, contact Process Level Technology, Ltd.
immediately. All Process Level Technology, Ltd. magnetic gages are fully insured against damage or loss unless
specified by the customer otherwise. Claims must be filed within 15 days from the date of receipt of shipment.
2.3.2. CHAMBER ORIENTATION
The magnetic float is packaged separately for shipment; the Float is strapped externally to the outside of
chamber which should be removed before installation. The float chamber should always be leveled vertically. If
it is not leveled correctly, the float may be magnetically uncoupled from the level indicator during operations.
2.3.3. CONNECTION VALVES
Valves should be installed between the process vessel and level gage to allow for isolation, draining, and cleaning
purposes. (See section 2.6.2. on Maintenance for more details on cleaning and maintenance procedures). Standard
block valves can be ordered with the gage or separately from Process Level Technology. Ball check valves are
not necessary for magnetic level gages. If certain valve specifications are required, please advise Process Level
Technology, Ltd. accordingly.
2.3.4. FLOAT ORIENTATION
The internal magnetic float has a preferred orientation vertically which is inscribed at the top of the float. Install
the float properly by taking note of the correct orientation through the chamber flange connection. If the float is
installed into the chamber inverted, it will not couple with the external indicator correctly, resulting in improper
level indication. Floats that are installed in gages with inverted chamber construction will contain a loop at the
top of the float for installation and removal purposes. Internal floats should be installed after any hydrostatic
field tests of the chamber and connecting vessel are complete.