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Brand: Liquid Controls
Liquid Controls MA-Series LPG and Ammonia PD Meters
Description
Class 10 and class 12 meters for LPG and anhydrous ammonia delivery
The Liquid Controls MA-Series is a family of rotary positive displacement meters for the transfer of liquefied petroleum gas (LPG) and, in the larger MA sizes, anhydrous ammonia (NH3). The manufacturer calls its class 10 and class 12 meters the industry standard for safe and accurate delivery of LPG and ammonia from bobtail trucks, dispensers and bulk plants. The same product page lists the MSA-Series, which carries the same meter element in a steel case with ANSI flanges for higher-flow LPG transfer.
The measuring principle is the tri-rotor design used throughout the Liquid Controls range: a blocking rotor and two displacement rotors turn in synchronized relationship without metal-to-metal contact in the chamber, which is the reason the manufacturer gives for sustained accuracy and fewer recalibrations. MA meters are rated to 350 psi (24 bar) and are normally fitted with an electronic register such as the LCR.iQ, a strainer, a vapour or air eliminator and a preset valve.
Technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Liquid Controls (IDEX Energy, Advanced Flow Solutions) |
| Type | Tri-rotor positive displacement meter for LPG and NH3 |
| Models, MA-Series | MA-4, MA-5, MA-7, MA-15 |
| Models, MSA-Series | MSA-30, MSA-75 (aluminium with steel case) |
| Rated pressure | 350 psi (24 bar, 2414 kPa) for MA-Series; 300 psi (20.7 bar, 2068 kPa) for MSA-Series |
| Meter classes | Class 10 LPG (propane, butane and similar); class 12 anhydrous ammonia on MA-7 and MA-15 |
| Construction | Aluminium (MA-Series); aluminium with steel case and 300 lb ANSI RF flanges (MSA-Series) |
| Seals | Buna N; EPDM for class 12 |
| Bearings | Carbon |
| Repeatability | 0.02% or better at any flow rate over the entire range |
| Linearity | Mechanical +/-0.125% over 5:1, +/-0.22% over 10:1, +/-0.5% over 40:1; electronic +/-0.10%, +/-0.10% and +/-0.15% respectively |
| Temperature range | -40 to 160 F (-40 to 71 C) for MA-Series; -40 to 185 F for MSA-Series |
| Viscosity range | Less than 30 SSU (under 1 cP) to 1,500,000 SSU (325,000 cP) |
| End fittings | NPT, BSPT or weld (MA-Series); 300 lb ANSI (MSA-Series) |
| MA-4 data | Class I, Division 1, Group D (LPG) hazardous location rating, NEMA 4X enclosure, safety references NFPA 58 and UL 25 as listed by the manufacturer |
| Registration and accessories | Electronic, pulse output or mechanical register, temperature compensation (TVC), strainers, vapour eliminators, printers, valves, pulsers |
Models and flow ranges
| Model | Flange | Flow range (GPM) | Flow range (LPM) | Pressure |
|---|---|---|---|---|
| MA-4 | 1 in | 5 to 30 | 19 to 114 | 350 psi |
| MA-5 | 1.5 in | 12 to 60 | 45 to 227 | 350 psi |
| MA-7 | 2 in | 20 to 100 | 76 to 378 | 350 psi |
| MA-15 | 3 in | 40 to 200 | 151 to 756 | 350 psi |
| MSA-30 | 3 in | 35 to 350 | 132 to 1325 | 300 psi |
| MSA-75 | 4 in | 70 to 700 | 265 to 2650 | 300 psi |
The MA-4 serves low-flow LPG dispensing and bottle filling, the MA-5 lower-flow LPG, the MA-7 truck-mounted bobtail delivery and anhydrous ammonia, and the MA-15 bulk LPG metering. For the MSA meters the product page prints a maximum pressure of 350 psi next to a 300 psi rating, so confirm the permitted pressure for those two sizes.
Selecting an MA meter system
A complete LPG bobtail system pairs the meter with a register, strainer, air or vapour eliminator and a one- or two-stage preset valve; the brochure shows an MA-7 class 10 system built this way. Select the size from the flow rate the pump delivers, confirm the class and seal material for propane or ammonia, and decide whether the register must print tickets, connect to a fleet system or control the valve. Wherever hazardous-area equipment is needed, check the approvals for the register and meter combination.
How the Liquid Controls MA-Series works
Liquid fills the measuring chamber and turns three rotors. A blocking rotor and two displacement rotors turn together without metal-to-metal contact. Each turn passes a fixed volume, and the register counts the turns.
Where the MA-Series is used
- LPG bobtail trucks
- LPG dispensers
- LPG bulk plants
- Anhydrous ammonia delivery
- Propane and butane transfer
Selection checklist for the MA-Series
- LPG or ammonia service
- Meter size
- Flow rate
- Working pressure
- End fitting type
- Register type
- Seal material
- Temperature range
Installation, commissioning and maintenance notes for the MA-Series
Fit a strainer upstream of the meter. Fit a vapour or air eliminator ahead of it. Add a preset valve and a register. Fill the line slowly and vent the air. Clean the strainer at regular intervals.
Requesting a quotation for the Liquid Controls MA-Series
Please send the product, the flow rate and the meter size. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.
MA-Series meter type
It is a rotary positive displacement meter.
MA-Series rotor design
It is a tri-rotor design.
MA-Series MA models
The models are MA-4, MA-5, MA-7 and MA-15.
MA-Series MSA models
The MSA-Series models are MSA-30 and MSA-75.
MA-Series class 10
Class 10 meters handle LPG such as propane and butane.
MA-Series class 12
Class 12 meters handle anhydrous ammonia on the MA-7 and MA-15.
MA-Series rated pressure
The MA-Series is rated to 350 psi or 24 bar.
MA-Series MSA pressure
The MSA-Series is rated to 300 psi or 20.7 bar.
MA-Series construction
The MA-Series is built in aluminium.
MA-Series MSA case
The MSA-Series has a steel case with 300 lb flanges.
MA-Series seals
The seals are Buna N, or EPDM for class 12.
MA-Series bearings
The bearings are carbon.
MA-Series repeatability
Repeatability is 0.02 percent or better.
MA-Series temperature range
The MA-Series works from minus 40 to 71 degrees C.
MA-Series viscosity range
The viscosity range runs from under 1 cP to 325,000 cP.
MA-Series end fittings
The end fittings are NPT, BSPT or weld.
MA-Series register
It is normally fitted with an electronic register such as the LCR.iQ.
MA-Series strainer
A strainer is normally fitted.
MA-Series preset valve
A preset valve is normally fitted.
Meter records for the MA-Series
Record the product, the meter size and the calibration dates.
Choosing the right MA-Series meter size
Choose the size from the flow rate and the product.
Documents and quotation
State the product (LPG or NH3), operating pressure and temperature, flow range, flange or fitting type, direction of flow, register and valve configuration, and any weights and measures or safety listing your authority requires. The attached MA-7 specification sheet shows the ordering form used by the manufacturer.
The attached Liquid Controls brochure covers the range tables and accuracy statements, and the MA-7 specification sheet gives the ordering form for that size. Seven Star LLC, an independent supplier in Muscat, quotes the meter after the configuration is known. Related meters are listed under Flowmeters.
Datasheets & Documents
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About brand
Liquid Controls is the maker of the original tri-rotor positive displacement flow meter, a design patented in 1954 and first used by the U.S. Air Force, and today an IDEX Energy brand. Its meters measure refined fuels, aviation fuel, LPG, ammonia, crude oil and industrial liquids for custody transfer, and the LCR.iQ register controls and records the delivery. Seven Star LLC sources and supplies these meters and registers for fuel depots, LPG plants and tanker fleets in Oman.\n\n
Liquid Controls products listed here
\n\nThis page groups the M-Series meters for refined fuels, aviation fuel and bulk loading, the MA-Series meters for LPG and anhydrous ammonia, and the LCR.iQ electronic register that sits on the meter. Datasheets and brochures are linked on each product page.\n\n
Where tri-rotor meters are used
\n\nTypical uses are truck-mounted fuel delivery, LPG bobtail delivery, aviation refuelers, bulk plant and terminal loading of tanks, railcars and ships, and industrial transfer of syrups, solvents and oils. The manufacturer points to sustained accuracy, because there is no metal-to-metal contact in the measuring chamber.\n\n
What to send with an enquiry
\n\nSend the liquid and its viscosity, flow range, line pressure and temperature, flange size, seal material, register type and the weights and measures approval your authority requires. For a replacement, send the meter model and serial number from the type plate.
Related products
Frequently Asked Questions
Which products do MA meters measure?
Class 10 meters measure LPG such as propane and butane; class 12 meters on MA-7 and MA-15 measure anhydrous ammonia.
What is the rated pressure?
MA-Series meters are rated 350 psi (24 bar); MSA-Series meters are rated 300 psi (20.7 bar).
Which sizes are listed?
MA-4 (1 in), MA-5 (1.5 in), MA-7 (2 in), MA-15 (3 in), and the MSA-30 and MSA-75 steel-case meters.
What materials are used?
Aluminium meter bodies with carbon bearings and Buna N seals, with EPDM seals on class 12 ammonia meters.
Can an electronic register be fitted?
Yes, for example the LCR.iQ, as well as pulse-output and mechanical registers.
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