Ralston Tube Fitting Quick-test Adapters Ralston Tube Adapters can make connecting to tube fittings much easier. You can use Ralston Tube Adapters to connect to any brand of tube fitting without a wrench. Simply remove the tube nut and ferrules and then thread on the Ralston Tube Adapter. They seal using an integral o-ring so there are no worries…
Don’t Trust a Zero Shift
PIE Current Leak Detection A current leakage in a process loop, sometimes referred to as a ground fault condition, can be one of the most difficult and frustrating problems to diagnose. Often caused by incorrect grounding, corrosion or moisture, a current leakage will appear as a zero shift in calibration of the loop transmitter. Using a Loop Diagnostic Calibrator like the PIE 334 Plus allows…
Pressure Transmitter Calibration
Digital Manometer Applications High accuracy digital manometers/calibrators like the Meriam M400 are particularly useful as calibrators for pressure transmitters, pressure recorders, and other pressure measuring devices. A typical set-up for transmitter calibration is shown at the right. The digital manometer is connected through a tee to a transmitter and a pressure source (often a hand pump). The 4 – 20 mA…
Pressure Safety Valve Testing – Best Practices
A pressure safety valve (PSV) protects pressure vessels and piping systems from excessive internal pressure. When a system reaches a predetermined pressure the PSV opens, a portion of the media discharges, and the pressure inside drops to a safe limit. Once the pressure reaches the valve’s reseating set point, the valve closes. …
Grounding System Design in 6 Simple Steps
Why Soil Resistivity Matters Before designing or installing a grounding system, the first step is to measure the soil resistivity. Soil resistivity directly affects how electricity flows into the ground, which is critical for safety, reliability, and performance in electrical systems. This critical value determines how effectively a grounding electrode can dissipate fault current into the earth. Low soil resistivity means current can dissipate easily, creating an effective…
Why Digital Manometer Accuracy Matters
In industries where precise pressure measurement is critical, digital manometers have become a standard tool. As demand for tighter tolerances grows, understanding the accuracy, resolution, and calibration requirements of these instruments ensures reliable performance in the field. Digital manometer accuracy matters because small measurement errors can lead to big problems – from inefficiency and poor performance to regulatory violations and safety hazards. At JM Test Systems,…
