AII Repair Services India
AII (Advanced Instrumentation Inc.) is a USA-based manufacturer of analytical instrumentation, process control systems, and industrial sensor solutions with a strong global footprint. Founded in 1955, AII specializes in oxygen analysers, combustion control systems, and real-time process monitoring equipment critical to power plants, refineries, and chemical manufacturers worldwide, including major installations across Indian industrial infrastructure.
AII (Advanced Instrumentation Inc.) is a USA-based manufacturer of analytical instrumentation, process control systems, and industrial sensor solutions with a strong global footprint. Founded in 1955, AII specializes in oxygen analysers, combustion control systems, and real-time process monitoring equipment critical to power plants, refineries, and chemical manufacturers worldwide, including major installations across Indian industrial infrastructure.
Synchronics Electronics repairs the complete spectrum of AII analytical and combustion control equipment—oxygen analysers, zirconia sensors, transmitters, and combustion optimisation systems. Our 180+ engineers hold deep expertise in AII's proprietary sensor technologies and control interfaces, serving Indian thermal power stations, petrochemical plants, and sugar mills that depend on AII precision monitoring for process safety and efficiency compliance.
Expert AII oxygen analyser and combustion control system repairs across Indian industrial facilities.
AII Product Lines We Repair
Our engineers are trained on the full AII product range. Below are the major product families we service.
AII Oxygen Analysers (Zirconia & Electrochemical)
AII's flagship oxygen measurement systems for flue gas analysis, furnace monitoring, and combustion efficiency control. Common repairs involve zirconia probe failures, signal drift, sensor calibration loss, and display module malfunctions affecting power plant and refinery operations.
AII Combustion Optimisation & Control Systems
Integrated control modules that use AII oxygen analysers to adjust fuel-air ratios in real-time, reducing emissions and fuel waste. Repair issues include signal conditioning card failures, relay output failures, PID controller drift, and communication module faults.
AII Transmitter & Sensor Interface Modules
Standalone 4-20mA transmitters and sensor conditioning units that convert raw AII sensor signals into industrial control signals. Typical faults include zero/span drift, 4-20mA loop failures, and input amplifier saturation in high-temperature environments.
AII Flue Gas Analysis & Emissions Monitoring
Portable and fixed-mount analysers measuring O2, CO, NOx, and other combustion byproducts for regulatory compliance and efficiency audits. Common repairs involve probe contamination recovery, reference cell degradation, and data logging module recovery.
AII Zirconia Probe Assemblies & Sensors
Ceramic zirconia sensing elements at the core of AII's oxygen measurement technology. Failures stem from mechanical thermal shock, chemical contamination from ash and sulfur compounds, and electrical contact degradation requiring specialist probe testing and replacement.
Why Choose Synchronics for AII Repairs?
PCB-Level Expertise
We repair down to the component level — not just swap boards. Our engineers identify root causes, replace failed IGBTs, capacitors, processors, and gate drivers on AII equipment.
Fast Turnaround
Standard 7–10 working days. Express 3–5 days available for critical breakdowns. Emergency same-day/next-day service for unplanned downtime.
6-Month Warranty
Every repaired unit ships with a 6-month comprehensive warranty on parts and labour. Our repair success rate is over 94% across all brands.
All-India Service
Couriered repairs accepted from any city in India. Doorstep pickup available in Vadodara, Mumbai, Pune, Ahmedabad, Surat, Chennai, and more.
Common AII Equipment Faults We Fix
Based on 30+ years of repair data, these are the most frequent failure modes we see in AII equipment arriving at our workshop.
- ✓Zirconia Probe Complete Signal Loss or Dropout — Thermal cycling in furnace environments causes zirconia ceramic micro-fractures, mechanical vibration breaks internal platinum electrodes, or ash/salt deposits on the probe surface block oxygen ion conductivity. AII probes operating above 800°C in coal-fired boilers are especially vulnerable.
- ✓Zero/Span Calibration Drift or Sensor Reading Instability — Reference air cell degradation in AII analysers, electrolyte contamination in electrochemical oxygen cells, or aging of internal Nernst cell signal amplifiers cause measurement error accumulation. Typical drift is 2-5% per year; uncorrected drift impacts combustion control accuracy.
- ✓4-20mA Transmitter Output Stuck or Erratic — AII transmitter module relay contacts corrode or solder joints fracture due to thermal cycling. Loop power supply failures in control cabinets or ground faults in sensor cabling cause erratic current output. Humidity ingress in outdoor installations damages output optoelectronics.
- ✓Display Panel Blank, Dim, or Showing Invalid Readings — LCD or LED display module failure due to high furnace ambient temperatures (>50°C continuous) exceeding AII display ratings, backlight LED degradation, or corrupted firmware in display controller. Electrostatic discharge damage is common in dry Indian summers.
- ✓Combustion Control Loop Not Responding — Fuel/Air Ratio Not Adjusting — AII COM controller relay outputs fail to trigger fuel valve or damper actuators due to stuck contacts or open relay windings. Signal isolation optocoupler failure prevents control logic from reaching output stage. Tuning parameters corrupted by voltage spikes or firmware glitches.
- ✓AII Analyser Probe Not Heating or Heating Element Open Circuit — Heating element platinum or nichrome wire breaks due to thermal cycling stress or corrosion in salt/sulfur-rich furnace atmospheres. Thermostat bimetal contact weld or relay failure prevents heating current. Temperature sensor (RTD) inside probe fails, disabling thermostat feedback.
How We Repair Your AII Unit
Receive & Log
Your unit is logged into our tracking system with a unique job number. You receive WhatsApp / email updates at every stage.
Fault Diagnosis
Board-level diagnosis using oscilloscopes, LCR meters, and thermal cameras. Root cause identified before any repair begins.
Component Repair
Faulty ICs, capacitors, MOSFETs, IGBTs, and gate drivers replaced with genuine or equivalent-spec components.
Full-Load Test
Unit tested under rated load with original or equivalent motor. All parameters verified. 6-month warranty issued.
Industries Using AII Equipment
We serve plant maintenance teams across all major industries where AII automation is deployed.
Frequently Asked Questions — AII Repairs
Do you repair AII equipment anywhere in India?+
Yes. Synchronics repairs the full AII oxygen analyser, combustion control, and sensor transmitter range. We offer same-day/next-day PAN India pickup from Mumbai, Delhi, Pune, Bangalore, Chennai, Hyderabad, Ahmedabad, Surat, and 50+ tier-2 cities. Equipment is transported to our Vadodara, Gujarat facility for expert diagnosis and repair. For critical power station or refinery applications, we offer expedited 48-hour turnaround on zirconia probe replacement and combustion controller rebuild.
What is the typical lifespan of an AII zirconia oxygen probe in an Indian power station?+
AII ZP-series zirconia probes typically survive 3-5 years in Indian thermal power stations, depending on coal sulfur content and furnace temperature stability. High-sulfur Indian coals accelerate probe degradation to 18-24 months. Synchronics recommends annual cleaning and re-certification for probes over 2 years old. We source genuine AII replacement probes, pressure-test them in our furnace simulator, and provide installation guidance to ensure proper seating depth and thermal contact.
Can you repair AII combustion controllers on-site or do they need to come to Vadodara?+
For module-level faults (relay card failure, signal conditioning board damage), we recommend bringing controllers to Vadodara for comprehensive bench testing and replacement of damaged components. For field troubleshooting of control logic, tuning, or calibration issues, our senior engineers can visit major Indian industrial sites. We also support remote commissioning and PLC tuning via phone/video for familiar installations. Always book in advance—contact our dispatch team at synchronics.co.in.
How do I know if my AII oxygen analyser needs recalibration?+
AII analysers drift 2-5% per year in continuous operation. Warning signs: combustion efficiency dropping unexpectedly, control system hunting (fuel/air ratio oscillating), or your plant's emissions audit showing higher NOx/CO than previous years. Synchronics recommends annual calibration for power stations and biennial for intermittent-duty refinery analysers. We perform zero/span verification and record drift trends in your equipment file—data is provided for your compliance audits.
Do you stock AII spare parts or do we have to order from the USA?+
Synchronics maintains inventory of high-wear AII components—zirconia probes, heating elements, transmitter relay cards, and display modules—at our Vadodara facility. Lead time for these items is 48-72 hours. For specialty items (eg. specific COM controller variants or rare sensor models), we source directly from AII USA or authorized distributors; lead time 2-3 weeks. We recommend our customers keep spare probes in stock given the critical nature of combustion monitoring in Indian power and chemical plants.
How do I send my AII unit for repair?+
Pack the unit securely and courier it to our Vadodara workshop. Include a note with the fault description and your contact details. We will log it into our system and WhatsApp you a job number within 24 hours of receipt. Doorstep pickup is available in Vadodara, Ahmedabad, Surat, Mumbai, and Pune.
What is the cost of repairing a AII drive or PLC?+
Repair cost depends on the model and the fault. We offer a free diagnosis — once we identify the fault, we provide a fixed quotation before proceeding. Typical repairs cost 20–40% of the new unit price. We will never repair without your approval.
What warranty do you provide on AII repairs?+
All repaired units carry a 6-month comprehensive warranty covering the same fault and related issues. If the fault recurs within the warranty period, we repair it free of cost.
Do you provide a no-fix, no-fee guarantee?+
Yes. If we cannot repair your AII unit after diagnosis, you pay only the diagnosis fee (₹500–₹1,500 depending on the product). The unit is returned to you at no additional charge.
AII Repair Catalog
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Don't See Your AII Model Listed?
We repair the full range of AII industrial electronics — even if the specific model is not yet in our catalog. Send us the unit details and we'll confirm repairability within 24 hours.
Free evaluation • 6-month warranty • PAN India pickup
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Send us your faulty industrial electronics. Our engineers will diagnose it and provide a detailed quote within 24 hours — with no obligation to proceed.
Free Evaluation
No obligation
48hr Turnaround
Fastest in India
6-Month Warranty
Every repair
No Fix, No Charge
Zero risk policy
Pan-India Pickup
Doorstep service