Leak Testing and Metering Pump FAQs

At the factory a baseline leak test is performed to verify leak-tightness and functionality, and that test is a good indicator of an internal leak. Repeat it with the baseline settings and compare the results, then follow the tech note for your valve type.

The electronic regulator is calibrated in a static condition, so at higher flows or lower pressures its output may not reach the test pressure on its own. Place a master part on the test port and use the Valve-on seek-and-tune routine in the Pressure screen; when the pressure is reached, uncheck the box to save the regulator start value. Too much feedback causes oscillation.

The electro-pneumatic regulator uses a solenoid valve pair and a high-accuracy pressure sensor in a control loop; Kp and Ki are the proportional and integral gains of that loop. Three feedback/control methods are available with the electronic regulator option.

Test results can be collected by a computer through Ethernet or RS232 connections; ASCII can also send commands. Z-Series testers also support USB export and onboard storage.

Yes. Program setup data can be read and modified by a computer over Ethernet, either directly or with the ASCII protocol. Z-Series testers can also be hosted and controlled from a browser.

A chamber test finds leaks in sealed packages or devices that have no opening to fill. A reference volume is filled to a set pressure and, after pneumatic isolation, released into the test chamber; a bad part shows a pressure drop as air moves into the part. That difference sets the pressure tolerance.

A crack test finds the opening pressure of a check valve or similar item by ramping pressure until the valve opens.

A dynamic pressure is flowed through the part to atmosphere; an occlusion raises the back pressure. To set up the test you need samples of good and bad parts, ideally with varying grades of blockage.

Remove the front bezel (two screws on the bottom, one in the top right corner) and unlatch the display ribbon cable. On the Isaac HD the lid comes off first (eight screws) and the start and abort buttons are disconnected from the PC board.

Replacing a pressure transducer is a simple task and not a regular occurrence; the tech note covers the items to take care of during removal and installation.

With hold on fail enabled in the Clamps menu, a failed test flashes the Fail LED and keeps the clamp outputs set until the operator acknowledges the failure by pressing the LED; the post-test clamp timers then run.

Leak standards are calibrated in SCCM at a stated pressure in PSIG and corrected for the elevation of the end-use location. The datasheet lists dimensions, accuracy, ranges, media compatibility, engineering units and fitting information.

The test timers run from a clock signal generated by a crystal oscillator on the CPU board. Oscillator accuracy is ±1 second per month; the test timer including system latency is accurate to ±0.03 seconds. Z-Series timers use the same timing basis.