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Quick Answer: This manual covers installation, hot-tap retraction, and field maintenance of Silver Instruments insertion electromagnetic flowmeters with retractable sensor probes. Target pipe sizes range from DN50 to DN2000, pressure up to 40 bar, and medium temperature -20 °C to 150 °C. The probe works in raw water, cooling water, wastewater, and low-conductivity fluids down to 5 µS/cm.
Insertion Type Electromagnetic Flow Meter Retractable Sensor Probe Manual
Silver Automation Instruments builds insertion electromagnetic flow meters with a retractable probe assembly. The probe lets you extract the sensor under pressure without shutting down the line. We ship these meters to water treatment plants in Malaysia, cooling tower bypass loops in Thailand, and steel mill descaling circuits in Brazil. You get a full bore magmeter performance at a fraction of the cost when pipe sizes exceed DN300.
What the retractable probe solves
Conventional inline magmeters force a process shutdown and pipe drainage for cleaning or sensor inspection. The retractable insertion type keeps a ball valve and a sealing gland between the sensor head and the pipe interior. Loosen the locking collar, pull the stem back past the isolation valve, close the valve, and remove the probe without spilling process fluid. Customers from Saudi Arabia and Chile use this feature on seawater cooling return lines where shutdowns cost thousands of dollars per hour.
Here is the thing. The probe must be installed in a full pipe section with straight run requirements. Place it at least 10 pipe diameters downstream and 5 diameters upstream from any elbow or valve. For vertical pipes with upward flow, you can reduce the straight run by 30 % because air bubbles separate naturally. Most engineers skip the grounding ring, but you need one on lined pipes or plastic pipes. Order the optional ground electrode built into the probe tip when the pipe is HDPE or fiberglass.
Installation steps that field teams follow
Step 1. Weld the 1-1/2 inch or 2 inch NPT weld-o-let onto the pipe at the planned insertion point. We include a fitting with BSP threads for Asia-Pacific projects. A drilling jig keeps the hole saw aligned if you hot-tap under pressure. Step 2. Mount the isolation ball valve on the weld-o-let. Use a full-bore valve so the sensor tip clears the seat without scraping. Step 3. Screw the retractor assembly onto the ball valve and leak-test with water at 1.5 times pipe pressure. Step 4. Insert the probe until the tip crosses the pipe centerline. The scale on the stem indicates insertion depth. With a DN600 pipe the centerline insertion mark sits at 300 mm from the flange face.
Silver Instruments ships every probe with a depth calculation chart stuck inside the transmitter lid. We preset the insertion length for standard pipe schedules but confirm the measurement on site. Last year a customer in Vietnam ordered a unit for a DN900 concrete pipe with 18 mm lining thickness. Our support engineer sent a WhatsApp video in under 20 minutes showing how to offset the depth scale. Reach us at [email protected] or call +86-25-68650347 for pre-installation checks.
Transmitter setup and signal outputs
The probe connects to a remote or integral transmitter with the same electronics we use on inline Silver Instruments magmeters. You get 4-20 mA HART, RS485 Modbus RTU, and pulse output as standard. Program the pipe inner diameter in the Parameter menu. For a DN500 schedule 40 steel pipe, enter the exact ID of 486.6 mm. The transmitter compensates for the reduced flow area caused by the probe stem, which subtracts about 0.3 % of cross-section. We have tested this factor on a NIST-traceable calibration rig in our Nanjing facility.
Minimum conductivity is 5 µS/cm. That covers raw river water, treated effluent, and even deminera
Hot-tap retraction procedure
Because the probe can be removed under full process pressure, operators need to follow the sequence. Close the transmitter power first. Loosen the compression fitting nut slowly. Watch for any fluid weep past the PTFE seal. Pull the stem back steadily until the tip passes the ball valve seat. Close the ball valve. Release residual pressure through the bleed port on the retractor body. Then unscrew the entire probe assembly. We see many maintenance crews in Indonesian paper mills skip the bleed step and spray black liquor on the floor. The bleed valve exists for a reason.
The retractor mechanism uses a twin O-ring seal stack rated for 40 bar at 20 °C. At 150 °C the pressure limit drops to 25 bar. Confirm the temperature derating chart stuck on the transmitter housing. Silver Instruments supplies spare O-ring kits in Viton, EPDM, or Kalrez for aggressive chemicals. Order part number SIR-O-EPDM-2inch for standard wastewater service.
Field calibration and verification
Insertion magmeters calibrate with the pipe velocity profile, not the sensor alone. Silver Instruments programs the flow coefficient based on pitot traverse data from a sample pipe section. For typical turbulent flow with Reynolds number above 10,000, the coefficient hovers around 0.86 to 0.89. If your pipe has a 1D single bend upstream, the profile distorts and the coefficient can shift to 0.78. We recommend an on-site reference measurement with a portable ultrasonic clamp-on meter. Connect both meters to our paperless recorder and compare the totalizer over 30 minutes. Adjust the K-factor in the transmitter menu. Need a step-by-step video for K-factor tuning? Send an email with the subject line “Insertion probe K-factor” to [email protected].
FAQ for your engineering team
Can the probe be installed in a horizontal pipe from the top? Yes. Top mounting works if the pipe always runs full. For partially full drains or gravity sewers, side mount at 3 o clock or 9 o clock position prevents air pocket errors.
What is the maximum pipe pressure during retraction? 40 bar for standard carbon steel retractor, 16 bar for the PVC retractor option. Do not retract the probe against a reverse flow direction if pressure differential exceeds 2 bar.
How often should I clean the electrode? In raw wastewater, pull and inspect every six months. Use a soft sponge with dilute acetic acid. In clean cooling water, annual checks are fine. The transmitter diagnostics page shows electrode coating alert if the signal noise exceeds 50 mV.
Does the insertion probe affect pressure loss? The stem blockage causes a permanent pressure loss of approximately 0.2 % of pipe dynamic head. For a DN400 pipe at 3 m/s, that equals around 0.9 mbar. Negligible for pump sizing.
Can I use this meter for billing or custody transfer? Inline magmeters with full factory calibration suit custody transfer better. Insertion types are ideal for process control, pump protection, and plant water balance where 1 % to 2 % accuracy is acceptable. If you need 0.5 % accuracy for intercompany billing, ask our team about the inline electromagnetic flow meter range.
Silver Automation Instruments
www.flow-meter.com.au
[email protected]
Tel: +86-25-68650347
WhatsApp: +86-25-52155837
WeChat: +86 15365082610