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『Insertion Probe Flow Meter: Sizing Cost-Effective Multi-Variable Sensors for Large Municipal Pipelines』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)
Insertion Probe Flow Meter: Sizing Cost-Effective Multi-Variable Sensors for Large Municipal Pipelines
Quick Answer: For municipal pipelines larger than DN300, an insertion probe flow meter often costs less than a full bore mag meter. Choose an insertion electromagnetic probe when water conductivity is above 20 µS/cm and line size is DN300 to DN3000. Specify the multi-variable version with pressure and PT100 temperature to reduce separate ports and wiring on large mains.
Why Insertion Probes Fit Large Municipal Pipelines
Municipal water and wastewater networks run large pipes. DN500, DN800, DN1200 are common. Full bore flow meters become heavy and expensive at these sizes. An insertion probe mounts through a small ball valve or weld boss. This means lower cost and easier handling.
Most engineers skip the full bore option above DN400 unless the contract specification demands it. In practice, an insertion probe on a DN700 drinking water main gives the same flow measurement output with a much lighter installation. The probe tip sits in the flow stream and reads velocity from a small electrode area.
Sizing Parameters That Decide Probe Length and Sensor Type
Sizing starts with actual internal pipe diameter, not nominal diameter. A DN600 steel pipe may have an internal diameter of 594 mm. The probe length must reach the centerline or 1/8 of the pipe diameter. For DN600, a 600 mm insertion probe is common. For DN1000, specify a 1000 mm probe.
Ask for these values before quote. Flow range in m3/h or velocity range, pipe material, pressure, temperature, water quality. For raw water with high solids, select a probe with abrasion resistant electrodes. For drinking water, a standard stainless steel probe body works.
Multi-Variable Sensor Options and Outputs
A multi-variable insertion probe combines a flow sensor, a pressure transmitter, and a PT100 temperature element in one assembly. Output signals can be 4-20 mA HART for flow, 4-20 mA for pressure, and 4-20 mA for temperature. Some versions include RS485 Modbus RTU. This reduces cable runs and PLC input cards.
We have seen this on customer sites where the control panel is far from the pipe. In a wastewater treatment plant in Surabaya, Indonesia, the client used a single multi-variable insertion probe on a DN800 sludge return line. They wired three signals to one remote terminal unit and saved on two extra junction boxes.
Recommended Silver Instruments Models for Large Municipal Lines
Silver Instruments supplies two common insertion probe series. The SIMF-2200 is a basic insertion electromagnetic flow meter for clean water and treated wastewater. It handles pipe sizes from DN300 to DN3000, pressure up to PN16, and fluid temperature 0 to 70 °C. Accuracy is ±0.5 percent of reading above 0.5 m/s.
The SIMF-2300MV adds an integrated pressure sensor from 0 to 16 bar and a PT100 temperature probe. Output is 4-20 mA HART for flow, 4-20 mA for pressure, and 4-20 mA for temperature. It fits the same 2 inch NPT weld boss and works with a standard ball valve hot tap assembly.
For wastewater w
Installation and Hot Tap Requirements
Installation on a live pressurized pipe is possible with a hot tap. The pipe needs a 2 inch NPT or DN50 weld boss. A full port ball valve mounts on the boss. The probe inserts through the valve and seals with a compression fitting or packing gland. This avoids a full shutdown of the municipal main.
Straight run matters. Place the probe 10D upstream of any elbow and 5D downstream. For a DN600 pipe, that means 6 meters upstream and 3 meters downstream. If the pipe profile is not full, the reading will be low. For wastewater force mains, always keep the pipe full at the insertion point.
Cost and Quote Factors
Price depends on probe length, pressure rating, output options, and whether you need the multi-variable version. A basic Insertion Probe Flow Meter for a DN500 water line is often 55 to 70 percent cheaper than a full bore electromagnetic flow meter of the same size. The savings rise as the pipe gets larger.
Send us your pressure in bar, temperature in °C, pipe size DN, and flow range. Include water type, pipe material, and whether you need hot tap installation. This lets us confirm the probe insertion depth and output wiring.
Contact Silver Instruments at +86-25-68650347 or send a WhatsApp message to +86-25-52155837. Our WeChat is +86 15365082610. You can also visit flow-meter.com.au for product drawings and manuals.
FAQ
What minimum pipe size fits an insertion probe flow meter?
We recommend DN300 and larger. Below DN250, the probe body disturbs the flow profile and accuracy drops. Use a full bore electromagnetic or ultrasonic meter for small lines.
Can I install an insertion probe on an existing municipal line without shutting down flow?
Yes. Most municipal installations use a hot tap with a weld boss and ball valve. The process requires a qualified technician and safe pressure limits. Do not hot tap a line above the weld boss pressure rating.
What accuracy can I expect from an insertion probe flow meter?
The SIMF-2200 and SIMF-2300MV reach ±0.5 percent of reading above 0.5 m/s when installed with correct straight run. Below 0.3 m/s, the error can increase to ±2 percent. Calibration at our facility covers a velocity range of 0.2 to 8 m/s.
Does the multi-variable version work for wastewater with solids?
Yes. Select the ceramic electrode version and a probe with no moving parts. Avoid installing behind pump bends where gas bubbles collect. For raw sewage with rags, add a cleaning port on the boss.
How do I request a quote for a specific DN and flow range?
Send Silver Instruments your pipe internal diameter, pressure in bar, temperature in °C, conductivity in µS/cm, and flow range in m3/h. We will return a model number and price within 24 hours. Use WhatsApp or the phone numbers above.