Insertion Magmeter ISM 5.0

  • Electromagnetic with no moving parts
  • Simplified hot tap insertion design
  • Installs in 3-72″ (80-1800 mm) diameter pipes
  • Selectable 4-20mA, 0-5V or 0-10V output
  • 0-500Hz frequency output
  • Scalable pulse output
  • Description
  • Application Areas
  • Specifications
  • Brochure
  • User’s Guide
  • How It Works
  • F.A.Q

Product Description

ISM 5.0 Insertion Magmeter
The Accurate, Low Cost Alternative to Full-bore Magnetic Flow Meters

Measure flow of water and conductive liquids in full pipes from 3 to 72″ (80 to 1800 mm) diameter.

The ISM 5.0 dual pair electrode sensor inserts through a tap in the pipe wall. It can be easily installed in new pipe systems or by hot tap in pressurized pipes with flowing liquids. There are no moving parts so obstruction to flow and pressure drop is minimal. Installation through a full port ball valve allows easy retraction and reinsertion without shutting down flow. The insertion depth is adjustable according to the pipe diameter and an insertion depth gauge is supplied with each flowmeter. The optional Installation Hardware Kit includes a branch outlet, close nipple and full port 1” isolation valve.

The ISM 5.0 Insertion Magmeter senses flow using a low maintenance electromagnetic design with no moving parts. The dual-electrode sensor and continuous auto-zero function provides high accuracy – even at low flow rates. State-of-the-art electronics and patented design features help maintain its NIST traceable accuracy over time.

No Onsite Calibration Required

Based on your pipe type and size, liquid and flow rate each ISM 5.0 Insertion Magmeter is shipped from our factory configured for your application and ready to install. Connect the isolated 4-20mA output to control system or remote display, or use the relay pulse output.

  • Potable Water
  • Water Distribution
  • Pumping Stations
  • Filter Balancing and Backwash
  • Reclaimed Water
  • Treated Water
  • Irrigation Water
  • Cooling Water
  • Raw Water


Provide a Greyline ISM 5.0 Insertion Magmeter complete with all installation hardware necessary to enable insertion and removal of the meter without system shutdown. The flow meter shall be hand-insertable up to 400 psi. For installations in non-metallic pipe, install grounding rings or probes. Materials of construction for wetted metal components shall be 316 SS.  The flow meter shall average velocity readings from two sets of diametrically opposed electrodes.  Each flow meter shall be individually wet-calibrated against a primary volumetric standard that is accurate to within 0.1% and traceable to NIST*.  A certificate of calibration shall be provided with each flow meter. Accuracy shall be within ± 1% of rate from 2-20 ft/s. Overall turndown shall exceed 100:1.

Output signals shall be completely isolated and shall consist of the following: (1) analog output; 4-20mA, 0-10V, or 0-5V jumper selectable, (1) scalable dry contact output for totalization, and (1) high resolution frequency output for use with peripheral devices.  ISM 5.0-B for Bi-directional applications shall provide additional contact outputs for direction and flow totalization in each direction. Each flow meter shall be certified to NSF Standards and covered by the manufacturer’s two-year warranty.

* National Institute of Standards and Technology

Optional Flow Display

D-100 Series Display Module for network interface and local / remote indication of flow rate and total.
Specifications are subject to change without notice.
Please contact  AKTEK if you need more information or for advice in your application.

ISM 5.0 Insertion Magmeter brochure

ISM 5.0 Insertion Magmeter brochure

ISM 5.0 Insertion Magmeter User Guide

ISM5.0 Insertion Magmeter User Guide

How It Works

The ISM 5.0 Insertion Magmeter operates based on Faraday’s Law of electromagnetic induction: as flow velocity of a liquid increases through the magnetic field generated by the sensor head of the ISM flow meter, electrodes measure the voltage increase to accurately calculate flow. Four electrodes measure the induced voltage on opposite sides of the sensor. The voltage readings are sampled and averaged.

The ISM 5.0 Insertion Magmeter measures flow of electrically conductive liquids (20 µS/cm or greater) in full pipes. For proper measurement on plastic pipes the electromagnetic flow meter requires electrical grounding by connection to grounding rings or ground probes inserted into the pipe. Readings are not affected by the fluid temperature, pressure or viscosity.

No signal

Answer: • Verify that the meter is properly inserted into the pipe. • Verify that the electronics enclosure is parallel with the pipe. • Verify 24 V supply voltage. • Verify correct wiring to control system (see wiring diagram). • Verify that there is flow in the pipe. • Verify that the meter earth cable is connected to earth. • Check to see if the alarm contact closure output is closed (orange & white wires). A closed contact could indicate either an empty pipe or excessive electrical noise, possibly due to a poor earth ground. • Low conductivity water (≤ 20 µsiemens) may activate the empty pipe detector and/or increase the potential for electrical noise problems.

Reading too high or too low

Answer: Verify pipe size. Contact AKTEK if pipe size is different from calibration tag. • Verify that the meter is properly inserted into the pipe. • Verify that the electronics enclosure is parallel with the pipe. • Verify correct wiring to control system (see wiring diagram). • Confirm that the output signals are consistent with each other (frequency vs. analog, etc). • Confirm that the control system is programmed for correct flow range or scale factor. • Verify that the meter earth cable is connected to earth. A poor earth connection can lead to excessive noise that can affect the flow reading.

Analog signal seems high or low and does not correspond to frequency output

Answer: Check for ground loop or offset voltage: • Disconnect analog signal input from control system and measure analog output directly from the flow meter. Reconnect signal input to control system and measure the analog signals again. Any difference between these readings indicates a potential ground loop or offset voltage. Please contact AKTEK for further assistance.

Control system displays flow rate, but no flow rate is indicated on the local display module or Btu meter

Answer: Verify that all wires from the flow meter are connected to the display module or Btu meter. • The frequency output wires (green and yellow) must be connected for any GREYLINE display or Btu meter.