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Endress Hauser Mag Flow Meter Troubleshooting: Common Error Codes and Practical Fixes
Quick Answer: Most Endress Hauser electromagnetic flow meter error codes such as E 011, E 020, E 024, E 035 and E 061 point to empty pipe, weak electrode signal, coil drive issues or broken sensor wiring. A field technician can fix many of these faults by checking grounding, cleaning electrodes and verifying cable connections. When the meter is beyond economic repair or lead times are too long, Silver Automation Instruments supplies compatible mag meters from stock with a 12-month warranty and fast delivery to Australia, Southeast Asia and the Middle East.
Error Code E 011 – Empty Pipe Detection Active
E 011 triggers when the transmitter sees an empty or partially filled pipe. First, confirm the process pipe is actually full. A 30 to 50 mm thick air pocket at the top of a horizontal DN80 line is enough to set this alarm. Next, inspect the empty pipe function settings in the transmitter menu. In many plants we visit, someone disabled the empty pipe detection during commissioning and forgot to turn it back on after a batch run. If the piping is full but the error persists, remove the sensor and check for a dry or cracked liner. A PTFE liner that has pulled away from the tube wall traps air and mimics empty pipe. On one site in Surabaya, a DN150 mag meter reading a 40 percent ethanol solution kept throwing E 011. The liner was intact but a conductive coating had built up on the electrode. Cleaning with a soft cloth and warm water solved it in 20 minutes.
Error Code E 020 – Electrode Signal Too Low
Low electrode signal usually means the process liquid conductivity has dropped below the minimum threshold. Endress Hauser mag meters typically need at least 20 µS/cm. Condensate return lines in steam systems, deionized water skids and some food-grade CIP rinse phases sit around 5 to 15 µS/cm and trigger E 020 repeatedly. Start by measuring the actual conductivity with a portable meter at the sensor location. If conductivity is truly low, a standard mag flow meter cannot measure it reliably. You may need a model with a high-impedance input or a capacitance-based electrode design. Silver Instruments offers an electromagnetic flow meter variant rated for liquids as low as 1 µS/cm, using a special electrode preamplifier built into the sensor head. Also check the electrode circuit resistance at the terminal box. A reading above 10 kΩ on a dry electrode pair suggests fouling. Drain the pipe, remove the meter and clean the electrodes. Avoid using metal brushes on platinum or Hastelloy electrodes. A soft toothbrush dipped in 5 percent acetic acid works well for most organic deposits.
Error Code E 024 – Coil Current Out of Range
E 024 appears when the excitation current driven into the field coils falls outside the allowed window. Most factories see this after a voltage dip, a loose connection at the coil circuit plug or a failing power board. Begin at the transmitter end. Measure the DC resistance between the coil drive terminals. For a DN50 Promag sensor, expect roughly 45 to 85 Ω. For a DN200 sensor, 25 to 45 Ω is typical. An open circuit or a value above 2 kΩ points to a broken coil wire inside the sensor housing. Heat and vibration are the usual suspects. A petrochemical blending plant in Thailand had a DN100 unit reading E 024 after three years of operation. The coil cable on the junction box side had oxidized so badly the clamp screw no longer made contact. Stripping back 10 mm of wire and terminating fresh cleared the fault. If the coil itself is open, the sensor needs a factory rewind or complete replacement. Lead time for a factory repair in Southeast Asia sometimes exceeds eight weeks. In that case, a new Silver Instruments mag meter with identical process connections ships in four to six days.
Error Code E 035 – Internal Communication Failure
This error code means the transmitter and the sensor electronics cannot exchange data. The most common cause is a damaged signal cable between the remote transmitter and the sensor. Check for cuts, crushed sections or water inside the cable gland. Shield continuity must be maintained. If you use a junction box, open it and look for green corrosion on the terminal strip. Humidity inside the box from daytime cooling tower drift is a classic root cause we see on sites in Vietnam and the Philippines. Dry the box with a heat gun on a low setting and replace the silica gel breather. After reassembly, spray the terminal screws with a moisture-displacing contact cleaner. If the cable is intact, reload the transmitter firmware from the local display or using FieldCare. A corrupted firmware block can happen after a brownout. Keep a backup of the parameter set on a laptop. When the firmware reload does not help, the sensor memory module may have failed. Contact an E+H service partner to read out the diagnostics log.
Error Code E 061 – Sensor Coil Disconnected
E 061 is a hard sensor hardware fault. The transmitter sends an excitation current but detects no return path. This almost always indicates a broken coil wire
Field Shortcuts That Save a Trip Back to the Workshop
We often hear from maintenance engineers who spend half a shift on an error that has nothing to do with the flow meter itself. Before blaming the mag meter, check the earthing rings. A missing or corroded earth ring introduces common-mode noise that the transmitter misreads as an electrode error. On plastic or lined steel pipes, you need two earthing rings or a built-in reference electrode. Without them, even a perfectly working meter shows ghost fluctuations. Also, verify the 4-20 mA loop power supply. A 12 V DC loop voltage sag under load can mimic a transmitter failure. So can a surge protection device that is leaking current after a nearby lightning strike. These details are easy to miss. One customer in Perth spent a week chasing an E 020 error on a DN50 meter used for latex emulsion. The real issue was a variable frequency drive on a pump 3 meters away with a missing shielded cable gland. Adding a clamp-on ferrite filter on the flow meter signal cable cut the noise by 80 dB.
When to Stop Troubleshooting and Consider a Replacement
Repairs make sense when the fault is in the transmitter, a cable or a removable electrode. When the sensor coil is open or the liner is torn, the cost of a factory refurbishment can approach 60 to 75 percent of a new meter. For plants operating on scheduled shutdowns, downtime is the bigger cost. Silver Automation Instruments keeps popular sizes such as DN25, DN50, DN80, DN100 and DN150 in stock with 316L electrodes and PTFE, PFA or hard rubber liners. Every unit leaves our Nanjing calibration rig with a 3-point wet calibration traceable to national standards. We ship DHL or sea freight to Sydney, Dubai, Lima, Cape Town and Kuala Lumpur on a 10-day door to door basis for stocked items. You get all the standard outputs: 4-20 mA HART, pulse, RS485 Modbus and optional Bluetooth for local readout on a phone. For hazardous areas, ATEX Zone 1 and IECEx certified versions are available on request. If you are unsure which liner or electrode material suits your process, email [email protected] with the concentration, temperature and expected pH. We reply with a full data sheet and price in under 24 hours.
Frequently Asked Questions
What is the minimum conductivity needed for an E+H mag flow meter? For most standard Endress Hauser models, the process liquid must have at least 20 µS/cm. For low-conductivity fluids below 5 µS/cm, a specialized capacitance-based mag meter is required. Ask us about the Silver Instruments model rated for 1 µS/cm if demineralized water or condensate is your application.
Can I replace only the sensor and keep the existing E+H transmitter? It is possible if the sensor coil resistance and electrode design match. However, mixing brands can void certifications and often leads to linearity drift. We recommend a complete mag flow meter from a single manufacturer to maintain accuracy and ATEX integrity.
How do I reset error codes on an Endress Hauser mag meter? Error codes clear automatically when the fault is resolved. For latched error codes, go to the “Diagnostics” menu and select “Reset error” or power-cycle the transmitter. Always confirm the root cause is fixed first. Repeated resetting without a fix damages the coil drive circuit over time.
Why does my mag meter show an empty pipe alarm when the pipe is full? A full pipe alone does not guarantee a bubble-free path. Air entrainment from a pump inlet vortex or a partially closed inlet valve can create a foam layer that the meter reads as empty. Install an air release valve upstream or reposition the meter to a low point in the line. If the liner is delaminated, trapped gas under the liner mimics the same alarm.
Where can I find a cost-effective replacement for an E+H Promag that ships quickly to Southeast Asia or Australia? Silver Automation Instruments supplies industrial mag flow meters from DN6 to DN3000. Mention the original Endress Hauser model code and our applications team matches the liner, electrode and process connection. Request a quote by sending pipe size, flow range and fluid type to sales@silverinstru
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