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McCrometer Insertion Flow Meter FPI Full Profile Adjustable Hot Tap Probes: Selection Guide for Engineers and Buyers
Quick Answer: The McCrometer FPI Full Profile Adjustable Hot Tap Probes are insertion electromagnetic flow meters built for large pipe liquid measurement and hot tap installation under pressure. You need to confirm pipe inside diameter, hot tap valve size, fluid conductivity, pressure, temperature, and straight run before you request a quotation. Silver Automation Instruments supplies similar insertion electromagnetic flow meters for DN80 to DN3000 pipes and can compare total installed cost for your project.
What the FPI Full Profile Adjustable Hot Tap Probe Does
The FPI probe does not sample a single point. It uses a sensor body that spans the full pipe diameter and measures velocity across multiple electrodes. That design gives a full profile reading and works better than single point insertion meters in disturbed flow profiles.
Most engineers pick this type of meter for water lines, raw water, cooling water, wastewater, and irrigation pipes from DN200 up to DN3000. The hot tap design lets a crew install or remove the probe without draining a live line. In municipal water networks and cooling loops, that shutdown cost is often the deciding factor.
Key Specifications to Check Before Buying
Pipe size and wall thickness come first. The adjustable hot tap probe fits a wide range, but the actual insertion length depends on pipe ID and valve height. A 2 inch hot tap ball valve is common for many installations. Some higher pressure jobs need a larger access valve and a stronger insertion tool.
Fluid conductivity is the next gate. Electromagnetic insertion meters need a conductive liquid. For most water and wastewater streams above 5 µS/cm this is not a problem. Oily water, pure water, and most hydrocarbons will not work. Pressure rating should be checked against the hot tap valve and mechanical assembly. Many standard hot tap probes are rated around 20 bar to 40 bar depending on factory options. Temperature is usually limited by the electronics and cable glands, often up to 60 °C or 80 °C.
Output and power need to match the control system. Typical configurations include 4-20 mA plus pulse, with HART or Modbus on many models. Power is often 24 VDC from a panel or a flow computer. If your site uses ATEX Zone 1 or IECEx, ask for the hazardous area certificate before ordering.
Installation and Straight Run Requirements
The full profile sensor reduces the need for very long straight runs compared to single point probes. A rule of thumb is 5 to 10 pipe diameters upstream and 2 to 3 downstream after elbows or pumps. We have seen customer sites with a short 3D upstream run where the reading was stable but shifted by 2 percent. Full profile meters forgive more, but they cannot fix severe swirl.
Here is the thing. Hot tap installation is simple on paper but field conditions change quickly. The crew needs a weld-on fitting, a ball valve, and a mechanical insertion tool. The tool controls depth and holds pressure during the process. Air pockets near the sensor can cause signal loss. Mount the probe at the 9 o clock or 3 o clock position for liquid lines, not at the top.
Where These Probes Fit in Real Plants
We get enquiries from water treatment plants in Vietnam, mining sites in Western Australia, and food processing plants in Mexico for large pipe flow meters. A typical application is a DN600 cooling water line with 4-20 mA HART to a PLC. Another is a DN1000 raw water line for a desalination plant in the Middle East. In these cases an insertion meter avoids the cost
For a DN1000 line, a full bore mag meter can weigh several tonnes and require a shutdown. A hot tap insertion probe can be installed in half a day without draining the line. That is the main reason buyers accept a slight accuracy trade off compared to a full bore meter.
Accuracy and Maintenance Reality
Do not expect an insertion meter to match a calibrated full bore electromagnetic flow meter on a short straight run. Typical accuracy for a full profile insertion probe is around 1 percent of reading above 0.3 m/s. Turndown can be 100 to 1 or better on clean water. On dirty water with solids, electrode fouling can slow response or cause baseline drift.
Most maintenance calls we hear about involve damaged electrode surfaces, moisture in junction boxes, or incorrect insertion depth. On wastewater lines with grease, plan for scheduled retraction and cleaning. Keep a spare seal kit and insertion tool on site. A paint manufacturer in Southeast Asia solved a recurring drift issue by moving the probe from the top of the pipe to the side. The old position trapped air and solids.
Silver Automation Instruments Alternative Options
Silver Automation Instruments is an industrial flow meter manufacturer. We supply insertion electromagnetic flow meters for conductive liquids in DN80 to DN3000 pipe sizes. We also supply full bore electromagnetic flow meters, ultrasonic flow meters, Coriolis mass flow meters, vortex flow meters, and thermal mass flow meters for gas. If you are comparing total installed cost against the McCrometer FPI full profile adjustable hot tap probe, send us your pipe size, pressure, temperature, and flow range.
Our team often recommends a full bore electromagnetic flow meter for DN15 to DN600 lines where budget allows and process shutdown is possible. For larger lines or live insertion work, our insertion electromagnetic meters with hot tap mounting are a practical fit. We provide HART, Modbus, pulse, and 4-20 mA outputs with ATEX and IECEx options. A common pairing is our insertion electromagnetic flow meter model SI-EMF-L with a 2 inch hot tap ball valve assembly for DN300 to DN2000 water lines.
Contact Silver Automation Instruments at Tel: +86-135-1213-1526, Whatsapp: 86-135-12131526, or WeChat: +86 13512131526. Tell us your flow range in m3/h, pipe inside diameter in mm, pressure in bar, and fluid type. We will reply with a model selection and price indication. You can also visit flow-meter.com.au for the full product range.
FAQ
Can the FPI full profile hot tap probe install without shutting down the pipe?
Yes. The hot tap design uses a ball valve and insertion tool. The pipe stays live during installation and retraction.
What minimum conductivity is required?
Most electromagnetic insertion probes need about 5 µS/cm minimum. Water and wastewater meet this. Hydrocarbons and pure water do not.
What pipe sizes can this type of meter handle?
Typical range is DN200 to DN3000. Some versions cover smaller or larger pipes. Check insertion length against pipe ID and valve height.
Is this meter accurate enough for billing?
It depends on local regulations and straight run. Full profile insertion meters can reach around 1 percent of reading on clean water. For custody transfer many utilities still require full bore electromagnetic or ultrasonic meters.
What outputs are available?
Common outputs are 4-20 mA, pulse, HART, and Modbus. Power is usually 24 VDC. Hazardous area versions can include ATEX or IECEx.
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