Block-and-Bleed Valve on a Pressure Transmitter: Isolate, Vent and Test Without Process Errors
A pressure transmitter needs to be checked while the plant remains in operation. The block...
Temperature Switch Cycles Too Frequently: Correctly Set Hysteresis, Deadband and Sensor Position
A fan switches on, turns off again a few seconds later and shortly afterwards switches...
Pressure Measurement in Refrigeration Systems: Correctly Accounting for Refrigerants, Pulsations and Low Temperatures
A pressure sensor on the high-pressure side of a refrigeration system shows plausible values while...
Oxygen Deficiency or CO₂ Hazard: Why an O₂ Sensor Does Not Replace Carbon Dioxide Monitoring
An oxygen sensor is installed in a cold room, fermentation cellar or laboratory. The display...
Synchronising Multiple Data Loggers: Correctly Comparing Clock Deviations and Measurement Channels
Three data loggers are monitoring a test bench simultaneously. One device records pressure, another temperature...
Checking a Hydrogen Measuring Point for Leaks: Correctly Assess Threads, Adapters and Leak Rate
A pressure sensor is installed on a hydrogen line, the thread is firmly tightened and...
Extending an Inductive Displacement Sensor Cable: Correctly Accounting for Cable Capacitance, Signal Conditioner and Zero Point
An inductive displacement sensor works perfectly on a test bench. After a machine modification, however,...
Humidity Sensor After Condensation: How to Assess Recovery Time, Drift and Permanent Damage
A humidity sensor has been continuously indicating 100% RH since a temperature change. The cold...
Evaluating Compressed-Air Leakage After Repair: Verifiably Demonstrating Leakage Rate and Savings
A compressed-air leak was located using an ultrasonic instrument, marked and subsequently repaired. During the...