The KOBOLD EPM is a flanged magnetic flow meter that measures volumetric flow of conductive liquids, slurries, and pastes in ½” to 24” nominal line sizes. Also called an electromagnetic flow meter or magnetic inductive flowmeter, it pairs a PTFE or hard rubber lined sensor with the UMF2 transmitter and is accurate to ±0.5% of measured value (1 to 10 m/s).
The process liquid needs a minimum conductivity of 20 µS/cm. The meter is maintenance-free and adds a negligible pressure drop to the line.
Magnetic Flow Meter for Slurries, Pastes, and Conductive Liquids
The EPM measures liquids, slurries, pastes, and other electrically conductive media by applying Faraday's law of induction. A conductive liquid moving through the meter's magnetic field induces a voltage proportional to its mean flow velocity, and the transmitter converts that voltage into a standardized 4-20 mA or pulse signal.
Small amounts of solids and gas bubbles are measured as part of the volume flow, while high amounts should be avoided.
Accuracy and Measuring Range
Accuracy is ±0.5% of measured value at flow velocities from 1 to 10 m/s, and ±(0.4% of measured value + 1 mm/s) from 0.25 to 1 m/s. The full-scale flow velocity can be set anywhere between 0.25 and 10 m/s (0.82 and 32.8 ft/s) to suit the flow rate being measured.
Each meter ships with a factory full-scale setting, from 13.2 GPM (3 m³/hr) in the 1/2 inch size to 5,283 GPM (1,200 m³/hr) in the 16 to 24 inch sizes. A full scale flow value corresponding to 10 m/s (32.8 ft/s) can be specified on the order. Repeatability is ±[0.15% of measured value + 0.005% × (Q at 10 m/s)].
PTFE or Hard Rubber Lining and Electrode Options
Two lining materials are available: PTFE and hard rubber. Electrodes come in 316L stainless steel, Hastelloy® C276, titanium, or tantalum, and flanges in painted steel or stainless steel. PTFE lined sensors are rated for process temperatures up to 266°F (130°C) at 362 psig or 212°F (100°C) at 580 psig and hard rubber lined sensors up to 194°F (90°C). The flange material determines the minimum process temperature, with painted steel flanges rated to 14°F (-10°C) and stainless steel flanges rated to -4°F (-20°C).
An optional grounding electrode is offered in the same materials as the measuring electrodes. Before using the meter with corrosive or abrasive media, confirm the resistance of all wetted materials.
UMF2 Transmitter with 4-20 mA, Pulse, Status, and HART
The UMF2 transmitter provides an active, galvanically isolated 4-20 mA analog output, a passive pulse output that can be configured as a frequency output up to 1 kHz, and a passive status output. HART® communication is available on the analog output, and local indication is a back-lit LCD with 2 lines of 16 digits.
Power supply options are 115 or 230 VAC and 24 VDC. Built-in diagnostics include empty pipe detection and coil current monitoring.
Compact or Remote Mounting with IP67 or IP68 Protection
The transmitter mounts directly on the sensor in the compact version or separately in the remote version, which includes a pipe or wall mounting bracket. The compact version is rated IP67. The remote version is rated IP67, or IP68 with a permanently encapsulated terminal box on the sensor side.
Remote mounting is the choice where access is poor, space is limited, process or ambient temperatures are high, or vibration is strong. It comes with 8 ft (2.5 m) of cable as standard, with lengths up to 164 ft (50 m) available.
Installation Requirements
Install the EPM with straight pipe runs of 5 pipe diameters upstream and 2 downstream, in a location where the sensor always stays full of liquid. Vertical lines with upward flow and siphons meet that condition. Installations on horizontal lines as long as the pipe remains fully filled at all times are also acceptable.
Avoid mounting the sensor on the suction side of a pump and support the pipe to limit vibration. For plastic or internally lined pipelines, the optional grounding electrodes establish the reference potential.
Magnetic Flow Meter Applications
The EPM is built for conductive liquids, slurries, and pastes in flanged lines from 1/2 to 24 inches and is designed for use in harsh environments. Readings are not affected by the pressure, temperature, density, or viscosity of the media.
Common Questions about EPM - Flanged Magnetic Flow Meter for Liquids, Slurries, and Pastes
The sensor is a lined flow body fitted with a magnetic field coil and two electrodes. When an electrically conductive medium passes through the field, a voltage appears across the electrodes that is proportional to the average speed of the flow. The UMF2 transmitter detects it and outputs a standardized electrical signal.
An electrical conductivity of at least 20 µS/cm is required, and the meter may only be used with media that meet this minimum. Solid particles and gas bubbles in small quantities are counted as part of the volume flow. Higher concentrations can cause malfunctions, so heavily aerated or solids-laden flows should be avoided.
Seventeen ANSI Class 150 flange sizes run from 1/2 inch to 24 inches. Factory full-scale settings start at 13.2 GPM for the smallest meter and reach 5,283 GPM for 16 inch and larger meters. Any size can instead be ordered with its full scale set at a flow velocity of 32.8 ft/s (10 m/s).
The minimum process temperature limits are dependent on the flange material, and the maximum process temperature limits are dependent on the liner material. Painted steel flanges have a minimum of 14°F (-10°C) and stainless steel flanges have a minimum of -4°F (-20°C). Meters with a PTFE liner have a maximum process temperature limit 266°F (130°C) at 362 psig or a maximum process temperature limit of 212°F (100°C) at 580 psig. Meters with a hard rubber liner have a maximum process temperature limit of 194°F (90°C). Ambient temperature may range from -4 to 140°F (-20 to 60°C), but LCD readability is limited below 32°F (0°C).
Three outputs are standard: 4-20 mA analog (active), pulse (passive, 24 V, 60 mA), and status (passive, optocoupler, 24 V, 60 mA), all galvanically isolated. The 4-20 mA output can be ordered with HART® protocol. Supply voltage is selected at order: 230 VAC, 115 VAC (both 50/60 Hz, 10 VA), or 24 VDC (10 W).
Separate mounting of the sensor and the transmitter is required when the measuring point is hard to reach, the space around the pipe is tight, the process medium or surroundings are hot, or vibration is severe. The sensor cable must be shielded, and only a sensor and transmitter with matching serial numbers may be connected to each other.
Plan for a straight inlet of at least 5 x DN and a straight outlet of at least 2 x DN, based on the sensor's nominal size. Strong electromagnetic fields must not be present near the installation point. Where a larger pipeline is reduced to the meter size, keep the reducer angle at 8° or less.
For the sensor to work correctly, the potential should be as close as possible to that of the process medium. On a metallic, non-insulating pipeline its connecting flange can serve as the ground. For insulating pipes, the optional grounding electrodes should be selected to provide the grounding reference. Because the electrode signal is only a few millivolts, no other electrical devices should share the same grounding conductor.
Yes. Magnetic flow meter, electromagnetic flow meter, magnetic inductive flowmeter, and magmeter are different names for one technology. Each describes an instrument that applies Faraday's law of induction to electrically conductive liquids, so the specifications of the EPM are the same whichever term you search for.
Product Specifications
Measuring Range
0.82-32.8 ft/s (0.25-10 m/s)
Lining Materials
Hard rubber, PTFE
Maximum Process Temperature
PTFE lining: up to 266°F (130°C) at 362 psig (25 bar); up to 212°F (100°C) at 580 psig (40 bar). Hard rubber lining: up to 194°F (90°C)
Accuracy
1-10 m/s: ±0.5% of measured value; 0.25-1 m/s: ±(0.4% of measured value + 1 mm/s)
Product Features
For Conductive Liquids, Slurries, and Pastes
Accuracy: ±0.5% of Measured Value
PTFE or Hard Rubber Lining
1/2" to 24" ANSI Class 150 Flanges
4-20 mA/HART®, Pulse, and Status Outputs
Compact or Remote Transmitter, IP67 or IP68
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