A1410 PULSAR vs UK1401 SURFER: which suits your testing requirement?

Both instruments are ultrasonic pulse velocity (UPV) testers for concrete from ACS (Acoustic Control Systems), Germany. They measure the same physical quantity, but they are built for different access conditions. This guide helps you choose between them.

What both instruments measure

Both send an ultrasonic pulse through concrete and report how fast it travels. Pulse velocity is a comparative indicator: higher, consistent velocities generally point to denser, more uniform concrete, while low or erratic readings suggest areas worth investigating. Neither instrument measures compressive strength directly, and neither tells you whether a structure is safe or what mix was originally used.

Strength can only be estimated from velocity after a correlation has been built for the concrete in question, typically by comparing readings with cored samples from the same element. Mix, aggregate, moisture, age and reinforcement near the path all change velocity. Guidance such as EN 12504-4 (the testing standard the A1410 manual lists) and EN 13791 (assessing in-situ strength) describes the principles; ask your engineer which applies to your project.

The practical difference: access and transducer layout

	A1410 PULSAR	UK1401 SURFER
Form	Electronic unit plus a separate transducer array on a cable	One-piece, single-hand unit
Test arrangements	Direct (through-transmission), indirect and surface	Surface
Measuring base	Adjustable, 50 to 2,500 mm	Fixed, 150 mm
Stated maximum thickness	2.5 m, material dependent	Not applicable (surface instrument)
Transducers	Dry-point-contact, 50 kHz, no couplant	Dry-point-contact, spring-loaded
Memory	Up to 50,000 measurements, in groups	Up to 50,000 measurements
Continuous operation	16 hours	16 hours
Strength function	Not listed in the manufacturer manual we hold; correlate externally	Estimate from integrated calibration curves for set concrete classes

Sources: ACS A1410 PULSAR operation manual and brochure; ACS UK1401 catalogue. See the product pages for links.

Choose the A1410 PULSAR when

You can reach both faces of a member and want a through-transmission reading, for example across a column, wall or beam.
You need an adjustable base, from 50 mm to 2.5 m, to suit different element sizes.
A project specification calls for UPV testing and you need direct, indirect and surface arrangements in one instrument.

Choose the UK1401 SURFER when

Only one face is accessible, such as slabs, pavements or walls with a hidden back.
You want a compact, one-hand instrument for quick comparative surveys across a structure.
You want the built-in strength-estimate function, understanding that it remains an estimate until correlated against cores.

Do not mix up the readings

Surface and through-transmission velocities are not interchangeable. A surface reading is influenced by the near-surface layer and tends to differ from a direct reading through the full thickness. Compare like with like, and keep the arrangement consistent when you build a correlation.

What neither instrument does

It does not locate reinforcement. For that, use a rebar detector such as the ZBL-R630A (see rebar scanner vs ultrasonic concrete tester).
It does not establish structural safety or load-carrying capacity.
It does not recover the original mix proportions.

Next step

If you tell us your application, the elements you will test and whether you can reach both faces, we can say which instrument fits. Both are supplied to order for Nigeria and Ghana: see the A1410 PULSAR and UK1401 SURFER pages, or request a quotation below.