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Yokogawa Magnetic Flow Meter: Admag AXW Series Industrial Induction Spools
Quick Answer: If you need a replacement spool or induction coil assembly for a Yokogawa Admag AXW magnetic flow meter, Silver Automation Instruments can supply a built-to-order spool body with the right liner, electrode material, flange standard, and face-to-face length. Send us your pipe size (DN), fluid type, temperature, pressure, and flange standard. We will quote a compatible option in 1 to 2 business days.
What the AXW Induction Spool Does
The AXW series spool is the welded flow tube section between the process flanges. This part holds the liner, the measuring electrodes, the grounding ring, and the induction coils. The induction coils sit outside the liner and generate the magnetic field. When conductive liquid flows through the spool, the electrodes pick up the induced voltage. The transmitter converts that voltage into flow rate, total flow, and a 4-20 mA HART output.
In many repair cases the AXW transmitter is still good. The spool fails first. Common problem areas include liner cracks, electrode coating, grounding ring corrosion, and water hammer damage. A replacement spool often costs less than replacing the complete meter and keeps the existing calibration records simple.
Common Failure Signs on AXW Spools
One sign is a drifting flow reading even when the process flow is stable. Another sign is a zero return when the pipe is full and the pump is running. In practice, most engineers first check the transmitter and the wiring. If those are fine, the spool is the next suspect. A paint manufacturer in Vietnam replaced two AXW spools last year after hard rubber liners cracked and exposed the metal body. The process fluid was not aggressive. The failure came from rapid temperature swings between 25 °C and 80 °C.
On desalination plants in the Middle East, we have supplied replacement spools with titanium electrodes and PTFE liners. The original spools had electrode coating problems from seawater and chemical cleaning agents. The output became unstable above 2 bar pressure swings.
Key Specifications for AXW Replacement Spools
Silver Instruments builds replacement AXW spools from DN15 up to DN400. Standard liners are PTFE, PFA, hard rubber, and polyurethane. Electrode materials include 316L stainless steel, Hastelloy C276, titanium, tantalum, and platinum-iridium. The process temperature range is from -20 °C to 120 °C depending on the liner. Pressure ratings cover PN16, PN40, ANSI 150, ANSI 300, JIS 10K, JIS 20K, and AS4087.
The minimum fluid conductivity for a standard spool is 5 µS/cm. For demineralized water, condensate, or high purity processes, we supply a high signal spool that works down to 0.1 µS/cm. Accuracy of the replacement spool with a matched transmitter is 0.35% of reading. The spool body meets IP67 for standard remote installation and IP68 for continuous submergence when specified.
How to Read an AXW Model Code for Spool Ordering
The AXW nameplate contains the full model code. This code includes fields for line size, liner material, electrode material, flange standard, grounding ring, and transmitter type. You do not need to decode all fields. Send a clear photo of the nameplate to Silver Instruments. We will decode the model code and confirm the exact spool configuration.
You should also measure the face-to-face length. AXW spools follow standard ISO 13359 and JIS lengths. For ANSI 150 flanges, a DN50 AXW spool typically has a face-to-face length of 200 mm. A DN100 spool typically has 250 mm. Confirm this dimension because some plants use non-standard lay lengths.
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We do not reline an old AXW spool. We build a new spool body with a new liner, new electrodes, and new coils. The flow tube is welded from stainless steel or carbon steel with a painted finish. The liner is applied in a controlled environment. Each spool is hydro tested to 1.5 times the rated pressure before packing.
We can match the coil resistance and calibration factor of your original AXW spool. This matters when you keep the existing Yokogawa transmitter. Give us the coil resistance reading from your maintenance team. Typical AXW coil resistance runs from 30 to 120 ohms depending on line size. A reading outside this range often points to coil damage.
What We Need from You for a Quote
Send us the following data by email or WhatsApp:
Line size and flange standard, for example DN80 PN16 or 3 inch ANSI 150
Fluid name and conductivity, for example seawater at 50 mS/cm or condensate at 5 µS/cm
Process temperature and pressure
Liner and electrode preference, or send a photo of the failed spool interior
Required delivery date and destination port
We will reply with a firm price, lead time, and freight options. Standard AXW replacement spools from DN25 to DN150 ship in 10 to 15 working days. Larger sizes from DN200 to DN400 ship in 20 to 30 working days.
Digital Integration and Hazardous Area Options
If your existing AXW transmitter is damaged, we can supply a complete magnetic flow meter with the same face-to-face length. Output options include 4-20 mA HART, pulse, frequency, and Modbus RTU. For hazardous areas, specify ATEX Zone 1 or IECEx Zone 1. The spool itself is passive, but the complete meter package will include the certified transmitter and cable glands.
Confirm the cable entry thread during ordering. Many plants in Southeast Asia use metric M20 cable glands. Sites in the Middle East often use NPT 1/2 inch. This small detail avoids extra machining on site.
Frequently Asked Questions
Q: Can you supply only the PTFE liner for an AXW spool?
A: No. We supply a complete new spool body with a new liner and electrodes. Relining an old spool is not cost effective after freight and hydro testing.
Q: What is the minimum conductivity for a replacement AXW spool?
A: The standard spool needs 5 µS/cm. The high signal spool works down to 0.1 µS/cm. For condensate or demineralized water, choose the high signal version.
Q: How do I check if the induction coil is bad?
A: Use a multimeter and measure the coil resistance. Typical AXW coil resistance is 30 to 120 ohms depending on size. An open circuit or a very low reading means the coil is damaged. Send us the reading and the line size.
Q: Can you match JIS flanges for an AXW spool in Southeast Asia?
A: Yes. We supply JIS 10K, JIS 20K, ANSI 150, ANSI 300, EN 1092-1 PN16, PN40, and AS4087 flanges. Send us the flange drawing if your plant uses a custom drilling pattern.
Q: Do you offer Ex certified replacement spools?
A: The spool is a passive metal part and does not need its own Ex certificate. If you need a complete ATEX or IECEx certified flow meter for Zone 1 or Zone 2, we can supply the full assembly with certificates.
Contact Silver Instruments for an AXW Spool Quote
Send your pipe size, fluid, temperature, pressure, flange standard, and required delivery date. Our engineers will confirm the correct replacement spool or complete flow meter for your Yokogawa Admag AXW installation.
Tel: +86-135-1213-1526
Whatsapp: 86-135-12131526
WeChat: +86 13512131526