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FH950 Flow Meter Field Guide: Hach Handheld Electromagnetic Flowmeter for Open Channels
Quick Answer: The Hach FH950 is a handheld electromagnetic flow meter for open channels, streams, and sewer lines. It reads point velocity from 0.01 m/s to about 10 m/s when the sensor is clean and placed correctly. For full pipe measurement, Silver Automation Instruments supplies inline electromagnetic flow meters in DN15 to DN3000 sizes with 4-20 mA HART output.
What Does the FH950 Field Guide Cover?
The FH950 field guide shows operators how to measure velocity in irrigation canals, stormwater drains, and wastewater channels. The meter uses an electromagnetic sensor. It does not need a weir or flume. You place the sensor at 0.2, 0.6, and 0.8 of water depth. That gives a mean velocity when the channel shape is known. The meter then calculates flow based on the entered channel dimensions. Operators in Vietnam, Indonesia, and Thailand use this method in concrete channels. We have seen the same workflow on customer sites many times.
What Are the Key Specs and Operating Limits?
The FH950 velocity range starts at 0.01 m/s. Most open channel sites run between 0.1 m/s and 3 m/s. Higher flows with heavy debris can disturb the sensor. Check the Hach manual for exact battery life and memory size. In practice, the probe needs a clean electrode surface. Mud, algae, grease, or scale cause low readings. A wastewater plant in Indonesia measured a 1.5 m wide concrete channel. The flow moved at 0.45 m/s. The operator cleaned the probe and repeated the profile. The new total matched the SCADA totalizer within 3 percent.
What Field Checks Prevent Bad Readings?
Clean the sensor before every shift. Use clean water and a soft cloth. Do not touch the electrodes with fingers. Check the cable for cuts or cracks. Keep the battery charged. Most engineers skip this part until the meter gives unstable numbers. Here is the thing. A small air bubble on the electrode can reduce velocity by 10 to 20 percent. Tap the probe gently to release bubbles. A customer in the Philippines left the meter in direct sunlight. The display overheated and shut down for 15 minutes. After moving to shade the readings returned to normal.
FH950 vs Inline Magnetic Flow Meter: Which One Do You Need?
The FH950 works for portable spot checks and open channels. It does not replace a fixed inline meter for pressurized pipe or custody transfer. For those jobs use a full bore electromagnetic flow meter. Silver Automation Instruments supplies inline magnetic flow meters in DN15 to DN3000 sizes. You can choose
What Are the Installation and Handling Notes?
Do not install the sensor near a pump outlet or sluice gate. Turbulence gives unstable values. Move downstream at least 10 times the channel width. In a Thailand irrigation canal, an operator measured 2 m downstream of a gate. The values jumped from 0.2 m/s to 0.9 m/s. He moved 10 m downstream and got a stable velocity profile. Keep the probe vertical and facing the flow. Wait for the reading to settle before recording. Use the average mode and take 5 to 10 readings per vertical. Record the water level, channel width, and time of day. That field data helps the office team validate the flow total.
How to Get FH950 or a Fixed Magnetic Flow Meter
Silver Automation Instruments helps customers source portable flow meters and supplies inline magnetic flow meters. We are not the Hach factory. For FH950 support and calibration, contact your local Hach partner. For a fixed inline meter or a portable electromagnetic flow meter from our range, send us your flow range, pipe size (DN), pressure (bar), and temperature (°C). We will reply with a model and price.
Contact Silver Automation Instruments.
Tel: +86-25-68650347
WhatsApp: +86-25-52155837
WeChat: +86 15365082610
FAQ
What is the Hach FH950 used for?
The FH950 measures point velocity and flow in open channels, rivers, streams, and wastewater channels. It helps operators check flow profiles without a weir or flume.
Can the FH950 measure partially filled pipes?
Yes, the FH950 can measure partially filled pipes if the water depth fits the sensor range. You need the pipe diameter and water depth to calculate flow.
How do you clean the FH950 sensor?
Use clean water and a soft cloth. Remove mud, grease, and algae from the electrode area. Do not use abrasive pads or solvents.
What is the difference between FH950 and an inline electromagnetic flow meter?
The FH950 is a handheld meter for spot checks and open channels. An inline electromagnetic flow meter is a fixed meter for full pipe flow and continuous output.
How do I get a quote for an open channel or inline flow meter?
Send your channel width, water depth, flow range, and whether you need portable or fixed measurement. Contact Silver Automation Instruments by phone or WhatsApp.
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