Concurrent and sequential multi-channel leak-test timing graphic

Z-series leak tester connected to a multi-position production fixture

Configuration Option

Concurrent vs
Sequential Leak Testing

Concurrent testing runs one test on several channels simultaneously with independent pneumatics and sensors; sequential testing routes one sensor through each channel in turn.

Both modes bring four fixture positions into one test station, but they solve different production problems. The choice is about how the station uses its channels and how the operator moves work through the fixture.

A concurrent configuration gives every active channel its own pneumatic path and pressure sensor. Four parts can fill, settle and test together, then receive individual results at the end of the same cycle.

A sequential configuration uses one sensor and routes it to each channel one at a time. It is useful when a fixture needs a paced sequence or when a multi-lumen catheter needs a cross-talk check between passages.

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Concurrent and sequential testing

What is concurrent leak testing?

Concurrent testing executes the same test across several channels at once. Each channel has independent test pneumatics and a pressure sensor, so one channel’s result remains tied to its own part.

Four loaded parts can move through the cycle together. The station returns a result for each channel without waiting for the other positions to take their turn.

✓Reduces elapsed cycle time for four loaded parts
✓Keeps channel results independent
✓Supports pressure decay, vacuum decay, mass flow and burst programs
✓Matches multi-part automation fixtures

What is sequential leak testing?

Sequential testing routes one sensor through the available channel outputs in a controlled order. The tester completes one position before selecting the next channel.

This arrangement can pace operators on a continuous line and lets a fixture check for cross-talk between lumens in a multi-lumen catheter.

✓Checks cross-talk between catheter lumens
✓Paces loading and unloading work
✓Uses one sensor across four outputs
✓Runs all available leak-test types

How a concurrent test runs

LOAD 4 PARTS

Place one part at each fixture position and establish the required seals.

FILL ALL CHANNELS

The tester fills the four independent pneumatic circuits to their programmed conditions.

TEST IN PARALLEL

Each channel measures its own part during the same test interval.

RESULT PER CHANNEL

The station reports the decision for each channel so the fixture can handle every part correctly.

In sequential mode, the tester selects one output, completes its programmed test, then routes the sensor to the next output until all loaded channels have been evaluated.

Concurrent vs sequential comparison

Configuration comparison for a four-channel fixture
Configuration detail	Concurrent	Sequential
Pressure sensors	Up to four (one per channel)	One sensor routed across channels
Channels tested at once	Up to four	One
Cycle time for four parts	One shared test cycle	Four channel tests in sequence
Detects cross-talk between lumens	✓	✓
Paces the operator	×	✓
Test types supported	Pressure decay, vacuum decay, mass flow, burst and configured methods	All configured test types
Best for	Fast multi-part fixtures and automated cells	Multi-lumen checks and paced manual work

Which Zaxis testers offer both

The Isaac HD and Zaxis 7i established multi-port configurations; the current Z8 and Z5 continue that role with up to four ports that can run sequentially or concurrently. The Z1 can be cascaded for synchronous multi-channel work.