AODD Pump Viscosity Limits: Negative Suction vs Below-Head Suction and What the Numbers Actually Mean
AODD pumps handle viscous fluids that centrifugal pumps can’t touch — but they’re not without limits. The Fluimac Phoenix technical specifications draw a clear distinction between two installation types, each with its own viscosity ceiling. Get this wrong at the selection stage and you’ll spend months dealing with slow cycles, diaphragm wear, and suction-side starvation […]
Solid Particle Size Limits in AODD Pumps: What You Can Actually Pump and at What Model Size
One of the reasons engineers specify AODD pumps for slurry and suspension duties is the ability to pass solid particles that would immediately block a centrifugal pump or damage a gear pump. But that capability has hard limits that vary by model size — and using a pump outside those limits doesn’t just reduce performance, […]
Air Quality Requirements for AODD Pumps: Why Lubricated and Wet Air Will Destroy Your Pump
Most AODD pump failures traced back to the air supply get blamed on low pressure. Pressure is easy to measure, so that’s where people look first. What actually damages the pneumatic circuit in most cases isn’t pressure — it’s air quality. Lubricated air, wet air, and contaminated air all destroy internal components that are designed […]
Why Snap-On Air Fittings Cause 90% of AODD Pump Stalls
Your AODD pump stalls. You check the air pressure — it reads fine at the regulator. You check the diaphragms — intact. You check the pneumatic exchanger — no obvious fault. The pump restarts when you disconnect and reconnect the air supply, then stalls again an hour later. The problem is almost certainly the snap-on […]
The Pneumatic Exchanger in an AODD Pump: What It Does and Why It Fails
When an AODD pump stalls for no obvious reason, most people check the air pressure first, then the diaphragms. The component that actually caused the problem — the pneumatic exchanger — gets checked last, if at all. That’s backwards. The pneumatic exchanger is the brain of the pump, and it fails more often than people […]
Why 90% of pH Sensor Failures Come from the Reference Cell — and How the LECOL B65 Fixes This
The glass membrane of a pH sensor rarely fails. Under normal operating conditions, a good pH glass membrane will last 2–5 years before its sensitivity degrades below useful limits. The reference cell, on the other hand, fails constantly — and in contaminated, hard, or chemically aggressive water, it fails quickly. Industry data on pH sensor […]
Why Standard pH Sensors Fail in Ultrapure Water — and What the LECOL B64 Does Differently
A standard pH sensor placed in ultrapure water does not measure the pH of the water. It measures a drifting, unstable number that is influenced by the sensor’s own reference cell leaching ions into the sample, by CO₂ absorption at the liquid junction, and by the extremely low ionic strength of the water itself. The […]
The Real Cost of Getting Metalcutting Fluid Concentration Wrong in CNC Machining
Most machine shops know their coolant should be at “around 5%”. What fewer understand is how far from that target the coolant actually runs on any given machine, on any given day — and what that deviation costs in tooling life, surface finish, corrosion, bacterial contamination, and operator health. Metalcutting fluid concentration is a process […]
How to Measure Bacteria in Metalcutting Coolant — and When to Act
A metalcutting coolant that smells like rotten eggs on Monday morning is already in serious trouble. The hydrogen sulphide odour is produced by anaerobic bacteria that have been multiplying in the sump over the weekend, without agitation, in the absence of oxygen. By the time the smell is obvious, bacterial counts are in the billions […]
Why EC Is the Wrong Way to Manage Fertigation (And What to Use Instead)
Electrical conductivity — EC — has become the default parameter for managing nutrient dosing in commercial horticulture. Growers target an EC setpoint, their controller doses fertiliser until EC reaches that number, and they call it done. The problem is that EC does not tell you how much nutrient a plant received. It tells you how […]